A corrosion-resistant pot liner
By using a composite board structure and coating design, the problem of corrosion at the cut edge of the rice cooker inner pot is solved, achieving corrosion resistance and structural stability of the inner pot, ensuring its safe and durable use.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGMEN JINYI HARDWARE PROD
- Filing Date
- 2025-08-31
- Publication Date
- 2026-07-31
AI Technical Summary
During the stamping process of existing rice cooker inner pots, the metal layers separate at the edges of the composite layer plates, resulting in a high risk of corrosion. The protective coating is difficult to adhere to and is prone to peeling off, thus failing to effectively prevent corrosion.
The composite board structure is adopted, with the inner board being thicker than the outer board. The exposed section is bent to form a closed cavity. The surface of the outer board is sprayed with an anti-corrosion coating, and the exposed surface of the inner board is sprayed with an anti-stick coating. The bending design and arc structure prevent liquid contact, and the arc section and convex edge prevent corrosion.
It effectively prevents corrosion at the cut edges of the inner pot, improves the strength and stability of the edge structure, prevents liquid corrosion and oxidation, and ensures the durability and safety of the inner pot.
Smart Images
Figure CN224572598U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rice cookers, and more specifically, to a corrosion-resistant inner pot. Background Technology
[0002] The inner pots of existing cooking appliances are typically made of composite metal sheets through stamping. Their structure consists of layers of different metals such as stainless steel, aluminum, and copper, pressed together under high temperature and pressure. The aim is to combine the properties of each metal layer to meet the comprehensive requirements of uniform heat conduction, lightweight, and durability during cooking. However, during the stamping process, stamping cuts are created at the edges of the composite sheets. At these cuts, the metal layers separate and become exposed due to stamping stress. That is, the metal layers, originally tightly pressed together by the rolling process, lose their interlayer bonding at the cut, resulting in the stainless steel, aluminum, or copper layers being directly exposed to the external environment. These exposed metal layer cuts pose a significant corrosion risk: firstly, the differences in electrochemical activity between different metals—for example, aluminum has a more negative potential than stainless steel—can create a galvanic cell effect when in contact with electrolyte solutions, such as salt water or acidic food broths during cooking, accelerating the dissolution and corrosion of the active metals; secondly, the metal edges at the cuts, due to increased surface roughness and the lack of a protective layer, are more prone to absorbing moisture and corrosive media, further exacerbating the localized corrosion rate.
[0003] To inhibit corrosion at the cut edges, existing technologies typically employ a protective coating sprayed onto the surface of the pot liner. However, the unique structure of the stamped cut edges leads to significant drawbacks in the spraying process: because the cut edge is a discontinuous interface where metal layers separate, the coating is difficult to adhere evenly to uneven surfaces during spraying, such as the junction between aluminum and stainless steel layers, and the coating material struggles to penetrate into the gaps between the metal layers inside the cut. Furthermore, the adhesion between the exposed rough edges of the metal layer and the coating is weak, making it prone to peeling off due to thermal expansion and contraction or cleaning friction, ultimately leaving the cut edge unprotected and the corrosion problem unresolved. Therefore, there is an urgent need for a corrosion-resistant pot lid to improve the problem of easy corrosion at the cut edges of existing rice cooker pot liners. Utility Model Content
[0004] The present invention aims to overcome at least one of the defects of the prior art and provide a corrosion-resistant pot inner pot to address the problem of easy corrosion at the cut edges of existing electric rice cooker inner pots.
[0005] The technical solution adopted by this utility model is a corrosion-resistant pot liner, comprising: a cavity body formed by composite plate, wherein the opening side of the cavity body is provided with an edge surrounding the cavity body;
[0006] The composite board includes: an inner layer board and a plurality of outer layers board laminated on the inner layer board;
[0007] The composite board has a notch, which forms a partial absence of the outer layer on the composite board, and forms an exposed section of the inner layer on the edge;
[0008] The exposed section is bent and connected to the outer layer plate, forming a closed cavity on the edge that closes the side exposed opening of the outer layer plate.
[0009] The main body of the cavity is used to hold food. The main body of the cavity consists of an inner plate and an outer plate. The inner plate is in direct contact with the food, while the outer plate is in contact with the heating plate of the rice cooker. The notch is used to leave space for the inner plate to be bent, and the closed cavity is used to close the exposed opening.
[0010] To prevent corrosion of the outer layer, the exposed surface of the outer layer is provided with a first coating that extends to the surface of the exposed section.
[0011] The first coating is an anti-corrosion coating.
[0012] To prevent food from sticking to the pot and to ensure the preservation effect, the exposed surface of the inner layer plate is provided with a second coating, which avoids the first coating.
[0013] The second coating is an anti-stick coating. The second coating avoids the first coating, ensuring the coverage of the anti-corrosion coating and improving the anti-corrosion stability.
[0014] For structural strength of the edge, the thickness of the inner layer is greater than that of the outer layer, and the edge width is 2 to 4 times the thickness of the inner layer.
[0015] The thickness of the inner layer ensures the structural strength of the edges.
[0016] For use and to secure the inner pot, the cavity body includes:
[0017] An integrated base plate structure and side plate structure;
[0018] The side plate structure comprises, in sequence: a vertical section, an outer extension section, a bending section, and an inner extension section;
[0019] The side of the vertical segment furthest from the outer extension segment is connected to the base plate structure;
[0020] The bent section and the inner extension section are formed through the exposed section;
[0021] The outer extension, the bent section, and the inner extension form the edge;
[0022] A gap is left between the inner extension segment and the vertical segment.
[0023] The base plate structure is located at the bottom of the main body of the cavity, extending upwards to connect with the side plate structure. One end of the vertical section is connected to the base plate structure, and the outer extension section is connected to the other end of the vertical section. The edge is easy to grip the pot, and the gap between the inner extension section and the vertical section is easy to fix the pot.
[0024] For ease of processing, the length of the epitaxial segment is 2.5 mm to 7 mm.
[0025] A length of 2.5mm-7mm facilitates bending processes.
[0026] To improve the protection effect, the inner extension segment forms an arc-shaped protrusion, which makes the distance between the middle of the inner extension segment and the outer extension segment greater than the distance between the two sides of the inner extension segment and the outer extension segment.
[0027] The curved protrusions are used to guide excess liquid downwards, preventing it from seeping into gaps and improving the protective effect.
[0028] To improve the stability of the structure, an arc-shaped segment is provided between the vertical segment and the outer extension segment, and the vertical segment is connected to the outer extension segment through the arc-shaped segment.
[0029] The curved section is used to provide a machining station for the edge, and the smooth transition improves the structural stability.
[0030] To accelerate the discharge of contents, the surface of the arc-shaped segment is provided with an inclined plane, which connects the vertical segment and the outer extension segment.
[0031] The inclined plane is used to guide and accelerate the discharge of contents from the inner pot.
[0032] To further prevent liquid corrosion, the extension segment is perpendicular to the vertical segment, and the two sides of the extension segment are provided with protruding edges.
[0033] The raised edge is used to impede the flow of liquid into the inner extension section, thus preventing liquid corrosion.
[0034] Compared with the prior art, the beneficial effects of this utility model are mainly reflected in the following aspects:
[0035] 1. Avoid liquid corrosion
[0036] By bending the exposed section of the inner layer plate to wrap around the shorter outer layer plate, a sealed cavity is formed at the exposed opening. This prevents the exposed opening from directly contacting the liquid and corroding the metal of the outer layer plate, and also prevents the exposed opening from contacting air and undergoing an oxidation reaction. Furthermore, spraying a first coating onto the outer layer plate, extending the coating to the surface of the exposed section, designing the inner extension as an arc-shaped protrusion, and providing raised edges on both sides of the outer extension all enhance the protective effect, preventing the exposed opening from being corroded by the liquid.
[0037] 2. Ensure the structural strength and stability of the edges.
[0038] By setting the edge width to 2-4 times the thickness of the inner layer, the structural strength of the edge is ensured; by connecting the vertical section and the outer extension section with an arc segment, excessive stress concentration is avoided, which could damage the edge and improve the stability of the edge. Attached Figure Description
[0039] Figure 1 The structure of this utility model Figure 1 .
[0040] Figure 2 The structure of this utility model Figure 2 .
[0041] Figure 3 This is a structural diagram of the cavity body of this utility model.
[0042] Figure 4 This is a structural diagram of the base plate structure of this utility model.
[0043] Figure 5 This is a schematic diagram of the edge of this utility model before bending.
[0044] Figure 6 This is a schematic diagram of the edge of this utility model after bending. Figure 1 .
[0045] Figure 7 This is a schematic diagram of the edge of this utility model after bending. Figure 2 .
[0046] Figure 8 The side plate structure of this utility model Figure 1 .
[0047] Figure 9 The side plate structure of this utility model Figure 2 .
[0048] Figure 10 This is a schematic diagram of the outer extension segment of this utility model.
[0049] Figure 11 This is a structural diagram of the inner extension segment of this utility model.
[0050] Figure 12 This is a structural diagram of the arc-shaped segment of this utility model.
[0051] Figure 13 This is a schematic diagram of the extension segment of this utility model.
[0052] Figure label:
[0053] Cavity body 100: Base plate structure 110: Circular bottom surface 111, arc-shaped structure 112; Side plate structure 120: Vertical section 121, Outer extension section 122: Protruding edge 1221; Bending section 123, Inner extension section 124: Protrusion 1241; Arc-shaped section 125: Inclined plane 1251;
[0054] Edge 200: Closed cavity 210; Inner plate 300: Exposed section 310; Outer plate 400: Exposed opening 410, notch 420. Detailed Implementation
[0055] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.
[0056] Example 1
[0057] like Figure 1-2 As shown in Figures 5-6, this embodiment provides a corrosion-resistant pot liner, comprising: a cavity body 100 formed of a composite plate, wherein the opening side of the cavity body 100 is provided with an edge 200 surrounding the cavity body 100;
[0058] The composite board includes: an inner layer board 300 and a plurality of outer layer boards 400 laminated on the inner layer board 300;
[0059] The composite board has a notch 420, which forms a partial absence of the outer layer 400 on the composite board, and forms an exposed section 310 of the inner layer 300 on the edge 200.
[0060] The exposed section 310 is bent and connected to the outer layer plate 400, forming a closed cavity 210 on the edge 200 that closes the side exposed opening 410 of the outer layer plate 400.
[0061] The main body 100 of the cavity is formed of a composite plate, which consists of an outer plate 400 and an inner plate 300. The inner plate 300 is made of a safe metal that can come into contact with food, while the outer plate 400 is made of a metal with good thermal conductivity and high strength, which ensures both the safety of the food and the strength of the pot. Multiple outer plates 400 can be set to improve the stability of the pot. One section of the outer plate 400 of the composite plate is shorter than the inner plate 300, forming a notch 420, which exposes part of the inner plate 300 to form an exposed section 310. The exposed section 310 is bent and wrapped around the shorter outer plate 400 to form a closed cavity 210, sealing the exposed opening 410 of the outer plate 400 and preventing the exposed opening 410 from contacting the outside and causing corrosion.
[0062] like Figure 2As shown, the exposed surface of the outer layer 400 is provided with a first coating, which extends to the surface of the exposed section.
[0063] The first coating is an anti-corrosion coating, which can greatly improve the corrosion of the exposed surface of the outer plate 400 that is in contact with the outside world.
[0064] like Figure 2 As shown, the exposed surface of the inner layer plate 300 is provided with a second coating, which avoids the first coating.
[0065] The second coating is an anti-stick coating. The second coating avoids the first coating, ensuring the coverage of the anti-corrosion coating and improving the anti-corrosion stability.
[0066] like Figure 1-2 As shown in Figure 7, the thickness of the inner layer 300 is greater than that of the outer layer 400, and the width a of the edge 200 is 2 to 4 times the thickness b of the inner layer 300.
[0067] The ratio of the width a of the edge 200 to the thickness b of the inner layer plate 300 is conducive to the implementation of the bending process, so that the exposed section 310 plate can well wrap the outer layer plate 400, and the thickness of the inner layer plate 300 is greater than that of the outer layer plate 400, which ensures the structural strength of the edge 200.
[0068] like Figure 1-9 As shown, the cavity body 100 includes:
[0069] An integrated base plate structure 110 and side plate structure 120;
[0070] The side plate structure 120 includes, in sequence: a vertical section 121, an outer extension section 122, a bending section 123, and an inner extension section 124;
[0071] The side of the vertical segment 121 away from the extension segment 122 is connected to the base plate structure 110;
[0072] The bent section 123 and the inner extension section 124 are formed through the exposed section 310;
[0073] The outer extension 122, the bent section 123 and the inner extension 124 form the edge 200;
[0074] A gap is left between the inner extension 124 and the vertical section 121.
[0075] The bottom plate structure 110 and the side plate structure 120 are integrally formed, ensuring the sealing effect of the inner pot. The bottom of the bottom plate structure 110 is flat, and the side is curved and extends upward. The bottom of the flat plate is in contact with the heating coil of the rice cooker to ensure the heating effect. The curved side makes the inner pot look round and beautiful. The bent section 123 and the notch form the inner extension section 124, which also provides the conditions for forming the closed cavity 210. Moreover, even if liquid comes into contact with the edge 200 during daily contact, it is not easy to seep into the closed cavity 210, thus improving the protection effect of the exposed opening 410 of the outer plate 400.
[0076] like Figure 1 and 9 As shown in Figure -10, the length c of the extension segment 122 is 2.5 mm to 7 mm.
[0077] By setting the extension 122 in the length range of 2.5mm-7mm, it is not only convenient to implement the bending process, but also convenient to grip the edge 200 and move the pot.
[0078] like Figure 2 and 9 As shown in Figure -11, the inner extension 124 forms an arc-shaped protrusion 1241, the protrusion 1241 making the distance between the middle of the inner extension 124 and the outer extension 122 greater than the distance between the two sides of the inner extension 124 and the outer extension 122.
[0079] By setting the inner extension 124 as an arc-shaped protrusion 1241, excess liquid accumulates along the arc-shaped protrusion 1241 and drips to the outside under the action of gravity, preventing liquid from seeping in along the gap between the inner extension 124 and the outer layer plate 400 and corroding the outer layer plate 400.
[0080] like Figure 1 and 8 As shown, an arc-shaped segment 125 is provided between the vertical segment 121 and the outer extension segment 122, and the vertical segment 121 is connected to the outer extension segment 122 through the arc-shaped segment 125.
[0081] The arc-shaped segment 125 connects the vertical segment 121 and the outer extension segment 122, making the force distribution more uniform and avoiding stress concentration at a sharp corner or connection point. By dispersing stress, the possibility of cracks or damage to the pot liner is reduced, and the structural strength and durability of the edge 200 are improved. The arc-shaped structure itself has good stability and can better resist external pressure and deformation. When the pot liner is squeezed or impacted, the arc-shaped transition connection part can effectively absorb and disperse energy, reduce the risk of deformation of the edge 200, and ensure its normal use function.
[0082] like Figure 1 , 8As shown in Figure 12, the surface of the arc segment 125 is provided with an inclined plane 1251, which connects the vertical segment 121 and the extension segment 122.
[0083] By setting the inclined plane 1251 between the vertical section 121 and the outer extension section 122, the contents of the pot can flow out along the inclined plane 1251 when it is poured out. Compared with the curved surface, the resistance is smaller, and it can be poured slowly, avoiding obstruction from the edge 200.
[0084] like Figure 2 , 8 As shown in -9 and 13, the extension segment 122 is perpendicular to the vertical segment 121, and the extension segment 122 has protruding edges 1221 on both sides.
[0085] By providing protruding edges 1221 on both sides of the outer extension 122, liquid on the outer extension 122 is prevented from flowing along the bending section 123 to the inner extension 230, and then through the inner extension 230 to the gap between the inner extension 230 and the outer layer 400, thus preventing corrosion of the outer layer 400.
[0086] Example 2
[0087] like Figure 1-13 As shown, this embodiment is a corrosion-resistant pot liner as described in Embodiment 1. The pot liner is composed of two materials: an outer layer called the outer layer plate 400 and an inner layer called the inner layer plate 300. The outer layer plate 400 is made of an alloy, which has good thermal conductivity but is relatively easy to corrode. The inner layer is made of a metal that can directly contact food, and has the characteristics of high safety and strong stability. The contact surface between the pot liner and the rice cooker, i.e., the exposed surface of the outer layer plate 400 and the surface of the edge 200 connected to the outer layer plate 400, is sprayed with a first coating to prevent corrosion of the pot liner's exterior, which would affect the heating effect and the pot liner's use. The inner layer and part of the edge 200 of the pot liner, i.e., the surface of the inner layer plate 300 and the surface of the edge 200 connected to the inner layer plate 300, are sprayed with a second coating, which ensures the safety of food during heating, prevents sticking, and facilitates cleaning.
[0088] The inner pot is divided into two parts: the lower part is the bottom plate structure 110, and the upper part is the side plate structure 120. The bottom of the bottom plate structure 110 is a circular bottom surface 111, and the side is an arc-shaped structure 112, which extends upward and connects with the side plate structure 120. The bottom of the bottom plate structure 110 is in contact with the heating plate of the rice cooker. The area of the circular bottom surface 111 is the same as or slightly larger than that of the heating plate, so that the rice cooker can heat the pot body and the food inside evenly. The arc-shaped structure 112 makes the pot body more rounded, improving the user experience and aesthetics.
[0089] The side plate structure 120 includes a vertical section 121 and an edge 200. The edge 200 is connected to the vertical section 121. The edge 200 and the vertical section 121 are connected by an arc section 125. Using an arc section 125 to connect them can make the edge 200 of the pot body feel more rounded. In addition, an inclined plane can be set on the arc section. When the pot body is poured, the inclined plane can guide and accelerate the discharge of contents, reducing resistance.
[0090] The edge 200 structure comprises two materials: an inner layer plate 300 and an outer layer plate 400. The inner layer plate 300 is located above the outer layer plate 400. The thickness of the inner layer plate 300 is greater than that of the outer layer plate 400, and the outer layer plate 400 is shorter than that of the inner layer plate 300. Part of the inner layer plate 300 is exposed, forming an exposed section 310. The exposed section 310 is bent along the lower outer layer plate 400 to wrap around the exposed opening 410 of the outer layer plate 400, forming a closed cavity 210. At this time, the length a of the edge 200 is approximately 2-4 times the thickness b of the inner layer plate 300, which improves the structural strength of the edge 200. The edge 200 can be considered as being composed of an outer extension 122, a bent section 123, and an inner extension 124. The portion of the inner layer plate 300 that is the same length as the outer layer plate 400 is called the outer extension 122. The portion connecting the outer extension 122 and bending downwards to form an arc is called the bent section 123. The portion connected to the bent section 123 and facing outwards towards the outer layer plate 400 is called the inner extension 124. The outer extension 122, bent section 123, and inner extension 124 are all made of the inner layer plate 300. When spraying a coating on the edge 200, the outer extension 122 and bent section 123, which may come into contact with food, are sprayed with a second coating to ensure safety, while the inner extension 124 is sprayed with a first coating to prevent corrosion of the exposed opening 410 of the outer layer plate 400. To facilitate the removal of the inner pot, the width c of the outer extension is designed to be within the range of 2.5mm-7mm. This range is convenient for users and also facilitates the bending process. Additionally, during the bending and fixing process, the entire outer extension 122 and both ends of the inner extension 124 can be clamped. When clamped, the middle of the inner extension 124 bulges outward to form an arc-shaped protrusion 1241. This design allows excess liquid on the edge 200 to collect at the bottom of the protrusion 1241 and drip to the outside, preventing liquid from seeping into the exposed opening 410 from the gap between the inner extension 124 and the outer layer 400. Alternatively, protruding edges 1221 can be provided at both ends of the outer extension 122 to prevent liquid from flowing towards the inner extension 124, which also serves to protect the exposed opening 410.
[0091] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A corrosion resistant can, comprising: A cavity body formed by a composite plate, wherein the opening side of the cavity body is provided with a perimeter surrounding the cavity body; characterized in that, The composite board includes: an inner layer board and a plurality of outer layers board laminated on the inner layer board; The composite board has a notch, which forms a partial absence of the outer layer on the composite board, and forms an exposed section of the inner layer on the edge; The exposed section is bent and connected to the outer layer plate, forming a closed cavity on the edge that closes the side exposed opening of the outer layer plate.
2. The corrosion resistant can according to claim 1, wherein, The exposed surface of the outer layer is provided with a first coating, which extends to the surface of the exposed section.
3. The corrosion resistant can according to claim 1, wherein The exposed surface of the inner layer plate is provided with a second coating, which avoids the first coating.
4. The corrosion resistant can according to claim 1, wherein, The thickness of the inner layer is greater than that of the outer layer, and the edge width is 2 to 4 times the thickness of the inner layer.
5. The corrosion resistant can according to any one of claims 1-4, wherein, The cavity body includes: An integrated base plate structure and side plate structure; The side plate structure comprises, in sequence: a vertical section, an outer extension section, a bending section, and an inner extension section; The side of the vertical segment furthest from the outer extension segment is connected to the base plate structure; The bent section and the inner extension section are formed through the exposed section; The outer extension, the bent section, and the inner extension form the edge; A gap is left between the inner extension segment and the vertical segment.
6. The corrosion-resistant pot liner according to claim 5, characterized in that, The length of the extension segment is 2.5 mm to 7 mm.
7. A corrosion-resistant pot liner according to claim 5, characterized in that, The inner extension forms an arc-shaped protrusion, which makes the distance between the middle of the inner extension and the outer extension greater than the distance between the two sides of the inner extension and the outer extension.
8. The corrosion-resistant pot liner according to claim 5, characterized in that, An arc-shaped segment is provided between the vertical segment and the outer extension segment, and the vertical segment is connected to the outer extension segment through the arc-shaped segment.
9. A corrosion-resistant pot liner according to claim 8, characterized in that, The surface of the arc-shaped segment is provided with an inclined plane, which connects the vertical segment and the outer extension segment.
10. A corrosion-resistant pot liner according to claim 5, characterized in that, The extension segment is perpendicular to the vertical segment, and the extension segment has protruding edges on both sides.