A cooking appliance

Abstract

The application discloses a cooking utensil, which comprises a cover body, a pot body and an inner container. The cover body comprises a main cover body, a first metal cover and a second metal cover. The first metal cover cooperates with the inner container to form a metal cooking cavity and constitutes a rigid first-stage seal. The second metal cover is located between the first metal cover and the main cover body and cooperates with the gap to form a second-stage seal outside the first-stage seal. An auxiliary sealing ring on the outer ring of the second metal cover forms the second-stage seal and a third-stage seal. Two floating assemblies drive the two metal covers to float and press against the inner container. The metal cooking cavity is connected with the atmosphere through a first steam exhaust hole and a first steam exhaust channel. The channel forms a rigid fourth-stage seal with the first metal cover. The leaked steam is introduced into the gap and exhausted through a second steam exhaust channel. The metal cooking cavity is formed, the contact between the sealing member and the steam is reduced, the accidentally leaked steam is collected in the gap and discharged in a directional manner, and the steam is prevented from entering the cover body or diffusing around.

Description

Technical Field

[0001] This application relates to the field of small household appliances, and in particular to a cooking utensil. Background Technology

[0002] Cooking appliances (such as electric pressure cookers and rice cookers) generally include a lid, a pot body, and an inner pot inside the pot body. In order to achieve a better cooking environment in the cooking cavity and to prevent steam from escaping and affecting the user experience, existing rice cookers have various sealing methods between the lid and the inner pot or the pot body. Generally, a sealing ring is added to the inside of the lid. Referring to the removable inner lid disclosed in CN219000067U, when the lid is closed, the outer edge of the inner pot is inserted into the sealing ring to achieve a seal. Alternatively, the outer edge of the inner pot and the lid work together to clamp the sealing ring to achieve a seal.

[0003] However, the above-mentioned solutions have revealed significant shortcomings after long-term use: the sealing ring located inside the lid is directly exposed to the cooking cavity, making it susceptible to contamination by food residue and broth. Furthermore, because it is installed deep within the lid, it is difficult to clean. Over time, the sealing ring may discolor or even mold, affecting not only the quality of cooked rice but also posing a health risk to consumers. As consumers increasingly demand aesthetically pleasing and healthy products, desilicone removal or reducing direct contact between silicone components and food is gradually becoming a market trend.

[0004] To remove the silicone seal inside the cooking cavity, an easy approach would be to directly cover the inner pot with a metal lid, forming a metal cooking cavity together. However, due to the high cost of metal, the metal lid is usually made into a thin component. When it relies solely on its own weight to hold the inner pot in place, as the temperature and pressure inside the cooking cavity increase, steam will push the metal lid open. On the one hand, steam escapes too quickly, affecting the cooking of rice and other ingredients; on the other hand, steam overflows from the contact point between the metal lid and the inner pot and spreads everywhere, severely impacting the user experience.

[0005] To address the issue of metal lid sealing, Japanese patent document JP1983078619A (and similar documents JP1988027621Y2, JP1988021208Y2, and JP1988000182Y2) discloses a similar solution: it has an outer pot within a frame and an inner pot housed within the outer pot. One side of the lid is rotatably fixed to the pot body via a hinge. The lid includes an upper plate, a lower plate, and an inner lid detachably disposed on the lower surface of the lid. The lid closes onto the inner pot, and the inner lid... No silicone sealant is placed between the outer circumference and the inner pot. Instead, an annular gasket fixed to the outer circumference of the lower plate seals the outer edge of the inner pot. The upper outer edge of the inner pot forms a space S between the inner lid and the lower plate. The lower plate and the condensation plate are pushed downwards by the mounting shaft and the helical spring, creating a gap between the condensation plate and the inner lid. The mucus produced during cooking flows into the condensation plate through this gap, while steam enters space S through the steam vent and is then discharged into the atmosphere through the steam vent. The annular gasket fixed to the outer circumference of the lower plate has two lips, which seal the inner lid and the inner pot respectively. Although the above solution proposes placing the sealant on the outside of the inner lid, the helical spring separates the inner lid from the condensation plate, making it difficult to guarantee a good seal between the inner lid and the inner pot. Furthermore, steam must enter space S before it can escape, and the annular gasket is located at the boundary of space S—the silicone gasket is in the path of the steam in the cooking cavity and is subject to long-term and heavy erosion. Therefore, the lifespan and cleaning issues of the annular gasket are still difficult to significantly improve.

[0006] Another improvement approach involves using a floating metal inner lid in conjunction with an elastic element. Patent number CN106923688B proposes the concept of eliminating the outer circumferential sealing ring. Specifically, it uses an outer lid and an inner lid, with the inner lid able to move slightly up and down relative to the outer lid. Through the elastic element located between the outer and inner lids, when the rice cooker is closed, the inner lid closes onto the inner pot of the rice cooker and is pushed up relative to the outer lid, pressing the elastic element. After being compressed, the elastic element exerts a downward counterforce on the inner lid, thus pressing the inner lid down and sealing it to the inner pot of the rice cooker, forming a good sealing effect. This method uses the sealing outer edge of the inner lid on the inside of the lid to seal with the outer edge of the inner pot of the rice cooker, eliminating the need for the easily deteriorated sealing ring in the original rice cooker. Due to limitations in the manufacturing process for achieving a flat surface on metal parts, it is difficult to achieve an ideal planar seal between the outer sealing edge of the inner lid and the outer edge of the inner pot of the rice cooker. This results in some areas where the seal is not secure. In such cases, if the inner lid deforms or there is excessive steam, steam may still overflow from the joint between the inner lid and the pot opening. This overflowing steam can enter the lid body and affect the lifespan of electrical components or plastic parts inside the lid. Alternatively, steam may overflow from the area around the joint between the lid and the pot body, causing steam to spread and negatively impacting the user experience.

[0007] Another approach to improvement involves altering the planar structure at the junction of the metal inner lid and the metal inner pot to guide steam out. In the solutions disclosed in CN118266764A, CN118266763A, and their related applications, an annular protrusion and a tapering section are provided at the top of the inner pot. When the lid is closed, the annular protrusion contacts the edge of the pot, and hot steam condenses at the tapering section and flows along the annular protrusion to form a water film, preventing steam leakage. Simultaneously, the vent is located at the top of the annular protrusion and above the edge of the pot. By increasing the height of the vent, steam diffusion is guided, thus eliminating the need for a pot-mouth sealing ring, simplifying the structure, and reducing production costs. However, this method places high demands on the shape of the inner lid, affecting space utilization and limiting its design. Furthermore, although theoretically increasing the reliability of the seal, under certain conditions (such as excessive pressure inside the cooking cavity), steam can still escape from the outer sealing edge of the inner lid and the outer edge of the inner pot, causing steam overflow and affecting the cooking effect and user experience.

[0008] In summary, while existing technologies have made various attempts to achieve effective sealing of metal cooking cavities, they have not yet achieved an ideal balance in terms of structural reliability, manufacturing cost, process feasibility, and aesthetic consistency. Solutions using sealing rings are prone to contamination, difficult to clean, and susceptible to discoloration and mold. Solutions that eliminate sealing rings are limited by the flatness of the metal parts, making it difficult to prevent steam leakage from the joint between the metal lid and the inner pot. This leaked steam either enters the lid, affecting the lifespan of electrical and plastic components, or overflows and diffuses from the joint between the lid and the pot, or continuously washes away the auxiliary seals, affecting their lifespan and cleanliness. Therefore, a new connection structure or process solution is urgently needed that can ensure good cooking results and mechanical stability while also considering mass production feasibility and cost-effectiveness, thereby truly promoting the popularization and upgrading of cooking appliances with metal cooking cavities. Summary of the Invention

[0009] This application discloses a cooking appliance that, based on the metal cooking cavity formed by the metal lid and inner pot, intercepts, collects, and directs the leakage of steam at the joint, so as to prevent the leaked steam from entering the interior of the lid and affecting the service life of electrical components and plastic parts, as well as from overflowing and spreading to the surroundings, and to reduce the direct contact between the seal and the steam.

[0010] A cooking appliance includes a lid, a pot body, and an inner pot disposed within the pot body. The lid includes: a main lid; a first metal lid, which cooperates with the inner pot to form a metal cooking cavity; a second metal lid, located between the first metal lid and the main lid, with a gap between the first metal lid and the second metal lid; a first floating assembly, which drives the first metal lid to float and press against the inner pot, the first metal lid cooperating with the rim of the inner pot to form a first-level seal, the first-level seal being a rigid seal; and a second floating assembly, which drives the second metal lid to float and press against the inner pot, the second metal lid cooperating with the rim of the inner pot to form a second-level seal, the second-level seal being a rigid seal. Outside the first-level seal; an auxiliary sealing ring, disposed on the outer ring of the second metal cover, the auxiliary sealing ring having a first sealing part and a second sealing part, the outer edge of the second metal cover and the inner liner forming a second-level seal through the first sealing part, the outer edge of the second metal cover and the first metal cover forming a third-level seal through the second sealing part; a first venting channel, the first metal cover having a first venting hole, the metal cooking cavity communicating with the atmosphere through the first venting hole and the first venting channel, the first venting channel and the first metal cover cooperating to form a fourth-level seal, the fourth-level seal being a rigid seal, steam accidentally leaking from the fourth-level seal being introduced into the gap; a second venting channel, the gap communicating with the atmosphere through the second venting channel.

[0011] Furthermore, it includes a first floating component and a plurality of second floating components, the first floating component being located at the center of the cover, and the plurality of second floating components being arranged around the first floating component.

[0012] Furthermore, after the lid is closed, the inner liner presses against the first metal cover and the second metal cover, and the first metal cover and the second metal cover are respectively compressed upwards to the first floating component and the second floating component until the first metal cover and the second metal cover are pressed tightly against the inner liner.

[0013] Furthermore, it also includes a steam valve, which has a combined steam exhaust channel that is connected to the first steam exhaust channel and the second steam exhaust channel respectively. The steam valve also includes a baffle, which is located above the outlet of the second steam exhaust channel and is spaced apart from the outlet of the second steam exhaust channel.

[0014] Furthermore, it also includes a steam valve, which has a main steam exhaust channel connected to the first steam exhaust channel and an auxiliary steam exhaust channel connected to the second steam exhaust channel, so that the steam exhaust of the metal cooking cavity and the gap are independent.

[0015] Furthermore, it also includes a mounting bracket for mounting the second metal cover, the second metal cover being fixed on the mounting bracket to clamp the auxiliary sealing ring to form a second cover body, the second cover body being able to move up and down relative to the main cover body via the second floating component.

[0016] Furthermore, the second metal cover and the mounting bracket cooperate to form a mounting cavity, and the first floating component is installed in the mounting cavity and partially extends to the outside of the second metal cover to abut against the first metal cover.

[0017] Furthermore, after the lid is closed, the elastic force of the first floating component is less than that of the second floating component, and the first metal lid and the second metal lid partially abut against each other, so that the second metal lid applies a downward force to the first metal lid.

[0018] Furthermore, the inner liner is provided with a first mating surface and a second mating surface. The first mating surface and the second mating surface are formed on the rim of the inner liner. The second mating surface is located outside the first mating surface and is higher than the first mating surface. The first metal cap and the first mating surface form a first-level seal, and the second metal cap and the second mating surface form a second-level seal. A longitudinally extending barrier wall is provided on the outer periphery of the first mating surface. The barrier wall blocks steam that may be accidentally leaked from the first-level seal.

[0019] Furthermore, the cover also includes a heating element for heating the gap; or, the first metal cover is detachably connected to the cover via a second floating assembly, and the second metal cover is fixed to the cover; at least the inner surface of the inner liner and the lower surface of the first metal cover form a titanium metal layer.

[0020] The beneficial effects are as follows: By adopting the above technical solution, the double-layer reinforced sealing structure thus formed utilizes its self-aligning characteristics to apply uniform and controllable clamping force to the first-level seal, the second-level seal, and the third-level seal. This not only achieves redundant sealing protection, but also significantly improves pressure resistance and leakage prevention capabilities through the synergistic effect of the three-level seals. Furthermore, both the first and fourth level seals are rigid seals, allowing the metal cooking cavity to be established. Steam and food do not come into contact with the silicone parts under normal operating conditions, solving the problems of easy contamination, difficulty in cleaning, discoloration, and mold growth of the sealing ring. The second level seal is located outside the first level seal, blocking leaked steam inside and preventing it from reaching the joint between the lid and the pot body, thus preventing it from overflowing and spreading from all sides. The third level seal cuts off the passage from the gap to the main lid cavity, protecting the electrical components and plastic parts inside the lid. Fourth, normal steam is discharged independently through the first exhaust channel without passing through the gap. The gap only collects a small amount of accidentally leaked steam and discharges it directionally through the second exhaust channel. The auxiliary sealing ring is transformed from a "main sealing element" to an "auxiliary sealing element located outside the rigid seal," no longer in the necessary path of steam in the cooking cavity. Lifespan, cleanliness, and mold and discoloration problems are improved simultaneously. Attached Figure Description

[0021] Figure 1 An exploded diagram of the structure of a cooking utensil.

[0022] Figure 2 This is a cross-sectional view of the structure of a cooking utensil.

[0023] Figure 3 for Figure 2 An enlarged schematic diagram of an assembly structure at point B.

[0024] Figure 4 for Figure 2 An enlarged schematic diagram of an assembly structure at point A in the middle.

[0025] Figure 5 for Figure 2 An enlarged schematic diagram of another assembly structure at point A.

[0026] Figure 6 for Figure 2 An enlarged schematic diagram of another assembly structure at point A.

[0027] Figure 7 for Figure 2 An enlarged schematic diagram of an assembly structure at point C.

[0028] Figure 8 for Figure 2 An enlarged schematic diagram of another assembly structure at point C.

[0029] Figure 9This is an exploded view of the second cover, the first floating component, and the second floating component.

[0030] The annotations in the figure are explained as follows: 1 - Pot body; 2 - Inner pot; 21 - Inner pot opening; 22 - First-level seal; 3 - Lid body; 30 - First metal cover; 301 - First groove; 302 - Handle; 304 - Second groove; 303 - Rivet; 305 - Magnetic metal sheet; 307 - First steam vent; 31 - Second lid body; 310 - Second metal cover; 3101 - Bending part; 311 - Mounting bracket; 32 - Main lid body; 320 - Top cover; 321 - Liner cover; 4 - Steam valve; 41 - Steam valve vent; 42 - Valve cover; 43 - Valve body; 51 - First floating assembly; 510 - First floating spring; 511 - First fixing plate; 512 - First guide post; 5 13 - First fastener; 514 - Metal protective cover; 5141 - Claw; 515 - Magnetic suction element; 516 - First limiting element; 518 - Protrusion; 519 - Mounting cavity; 52 - Second floating assembly; 520 - Second floating spring; 522 - Second guide post; 523 - Second fastener; 6 - Auxiliary seal; 61 - Second-level seal; 62 - Third-level seal; 7 - Seal; 72 - Second silicone seal; 73 - Third silicone seal; 75 - Fifth silicone seal; 91 - First exhaust passage; 911 - Metal pipe; 92 - Second exhaust passage; 93 - Merging exhaust passage; 94 - Fourth-level seal; 10 - Gap. Detailed Implementation

[0031] 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 some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] It should be noted that when a component is said to be "connected" to another component, it can be directly connected to the other component or it can be connected to a component in between. When a component is said to be "set on" another component, it can be directly set on the other component or it may be set to a component in between.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] The cooking appliances described in this application can be products such as rice cookers, micro pressure cookers, and pressure cookers. Among them, regarding... Figure 2 and Figure 3 - Figure 8 The relationship between them can be understood as follows: A, B, and C represent respectively... Figure 2 The relative position in Figure 4 , Figure 5 , Figure 6 Show each Figure 2 A technical solution located at position A. Figure 3 exhibit Figure 2 A technical solution located at position B. Figure 7 , 8 Show each Figure 2 A technical solution located at position C is described below with reference to the attached diagram. Figure 1 - Figure 9 The implementation plan is described in detail.

[0035] like Figures 1-2As shown, a cooking appliance includes a lid 3, a pot body 1, and an inner pot 2 disposed within the pot body 1. The lid 3 includes: a main lid 32; a first metal lid 30, which cooperates with the inner pot 2 to form a metal cooking cavity; a second metal lid 310, which is located between the first metal lid 30 and the main lid 32, forming a gap 10 between the first metal lid 30 and the second metal lid 310, preferably, the gap partially forming a cavity; a first floating component 51, which drives the first metal lid 30 to float and press against the inner pot 2, the first metal lid 30 and the edge of the inner pot 2 cooperating to form a first-level seal 22, the first-level seal 22 being a rigid seal; and a second floating component 52, which drives the second metal lid 310 to float and press against the inner pot 2, the second metal lid 310 and the edge of the inner pot 2 cooperating to form a second-level seal. 61, the second-stage seal 61 is located outside the first-stage seal 22; auxiliary sealing ring 6, disposed on the outer ring of the second metal cover 310, the auxiliary sealing ring 6 is provided with a first sealing part and a second sealing part, the outer edge of the second metal cover 310 and the inner liner 2 form a second-stage seal 61 through the first sealing part, the outer edge of the second metal cover 310 and the first metal cover 30 form a third-stage seal 62 through the second sealing part; first exhaust passage 91, the first metal cover 30 is provided with a first exhaust hole 307, the metal cooking cavity is connected to the atmosphere through the first exhaust hole 307 and the first exhaust passage 91, the first exhaust passage 91 and the first metal cover 30 cooperate to form a fourth-stage seal 94, the fourth-stage seal 94 is a rigid seal, the steam accidentally leaked at the fourth-stage seal 94 is introduced into the gap 10; second exhaust passage 92, the gap 10 is connected to the atmosphere through the second exhaust passage 92.

[0036] Understandably, the main cover 32 generally includes a face cover 320 and a liner cover 321. The face cover 320 serves as an exterior component, and decorative elements are often provided on top of it to enhance the product's aesthetics. The liner cover 321 is used to mount circuit boards, display components, etc., or to be hinged to the pot body 1. The main cover 32 generally uses a plastic frame structure to facilitate its use with the pot body 1 to achieve functions such as locking the lid, rotating connection, and mounting circuit boards. The main cover 32 can be in the form of a ring-shaped bracket, a flat plate covering the entire opening of the first metal cover 30 or the inner pot 2, or a strip-shaped flat plate, etc.

[0037] Understandably, "the first-level seal 22 is a rigid seal" means that there is no silicone or plastic at the sealing joint between the inner pot 2 and the first metal cover 30. When the inner pot 2 and the first metal cover 30 are entirely made of metal, the cooking cavity formed by the metal inner pot 2 and the first metal cover 30 is a metal cooking cavity; that is, the first metal cover 30 and the metal inner pot 2 form a metal cooking cavity. After the food is placed in the metal inner pot 2, the cover 3 is closed, and the food is cooked within the metal cooking cavity formed by the first metal cover 30 and the metal inner pot 2. By adopting the above technical solution, the silicone sealing ring between the first metal cover 30 and the inner pot 2 is eliminated, improving the usage environment of the cooking cavity.

[0038] Of course, those skilled in the art will understand that the inner pot 2 can also be a ceramic inner pot 2, an all-glass inner pot 2, an all-carbon inner pot 2, a coated metal inner pot 2, or an all-titanium inner pot 2. In this case, the first metal cover 30 and the inner pot 2 are also rigidly fitted and sealed. Food is cooked in the glue-free cooking cavity formed by the first metal cover 30 and the inner pot 2, improving the healthiness of cooking. At this time, the silicone ring between the first metal cover 30 and the inner pot 2 is eliminated, improving the usage environment of the cooking cavity. Preferably, at least the inner surface of the inner pot 2 and the lower surface of the first metal cover 30 are formed with a titanium metal layer, and the metal cooking cavity is an all-titanium cooking cavity.

[0039] Due to limitations in the manufacturing process for achieving a flat surface on metal parts, it is difficult to achieve an ideal planar seal between the outer sealing edge of the first metal inner cover and the outer edge of the inner pot 2. This results in some machines having unreliable local seals (consistency issues). Alternatively, under specific conditions (such as when cooking porridge or low-sugar rice, when the pressure inside the cooking cavity is too high), i.e., when the first metal cover 30 deforms or the steam volume is too high, steam may still overflow from the joint between the first metal cover 30 and the inner pot 2. The overflowing steam may enter the lid 3, thereby affecting the lifespan of electrical components or plastic parts inside the lid 3, or overflow from the area around the joint between the lid 3 and the pot 1, causing steam to permeate the air and affecting the cooking effect and user experience.

[0040] Therefore, in this application, the main cover 32, the second metal cover 310, and the first metal cover 30 are stacked sequentially. An auxiliary sealing ring 6 is provided on the outer periphery of the second metal cover 310. Specifically, as shown... Figure 3As shown, the auxiliary sealing ring 6 includes a first sealing part and a second sealing part. The second cover 3 and the metal inner liner 2 form a second-level seal 61 through the first sealing part. The second metal cover 310 and the first metal cover 30 form a third-level seal 62 through the second sealing part, and the second-level seal 61 is located outside the first-level seal 22. Using the above technical solution, the second-level seal 61 further limits the overflow direction of water vapor accidentally leaking from the first-level seal 22: the leaked steam is blocked inside the second-level seal 61 and cannot reach the joint between the cover 3 and the pot body 1, thus preventing steam from overflowing from the gap at the joint, avoiding steam diffusion, and improving the user experience. Furthermore, the second-level seal 61 and the third-level seal 62 form a stable pressure chamber. Due to the existence of this pressure chamber, steam cannot enter the first-level rigid seal formed by the first metal cover 30 and the pot body 1, thereby effectively avoiding the contact problem between steam, liquid, and the sealing ring. Even if water vapor accidentally leaks from the first-stage seal 22, only a small amount will be trapped between the second-stage seal 61 and the third-stage seal 62. In particular, the third-stage seal 62, due to the pressure from the first floating member and the second floating assembly 52, allows the first metal cover 30 and the second metal cover 310 to clamp the second sealing part more tightly. This solution, while improving the cooking cavity environment, completely solves the problem of leakage from the gap between the inner pot 2 and the cover 3, while reducing the direct impact of cooking cavity steam on the seals to extend their service life and facilitate cleaning. Clearly, the existing technology does not provide technical guidance for the pre-tightening reinforcement of the outer periphery of the first seal after achieving an external sealing ring through the cooperation of the double floating assembly and the auxiliary sealing ring 6. Preferably, the first and second sealing parts are integrally formed, but they can also be separate components.

[0041] Furthermore, to ensure a tighter seal between the cover 3 and the inner liner 2, the first floating component 51 causes the first metal cover 30 to float and press against the inner liner 2, and the second floating component 52 causes the second metal cover 310 to float and press against the inner liner 2. Specifically, after the lid is closed, the floating components are subjected to pressure and cause the first metal cover 30 and the second metal cover 310 to move downwards or upwards until the first metal cover 30 and the second metal cover 310 are pressed firmly against the inner liner 2.

[0042] Understandably, "moving downwards or upwards" refers to two operating modes of the floating component: One mode is that, in the open state (without closing, the same applies below), the floating component on the lid 3, carrying the first metal lid 30 and the second metal lid 310, is in a drooping state; after closing, because the inner pot 2 remains stationary or has a large supporting force, the inner pot 2 provides an upward supporting force to the first metal lid 30 and the second metal lid 310, causing the first metal lid 30 and the second metal lid 310 to compress the floating component upwards. The other mode is that, after closing, the floating component is driven by a driving force, causing the first metal lid 30 and the second metal lid 310 to move downwards until they are pressed against the inner pot 2 or the pot body 1. For example, the floating component includes a driving member and a connecting member. The driving member is a linkage or a button, and the connecting member is used to connect with the first metal lid 30 and the second metal lid 310; after closing, pressing the button or triggering the linkage causes the first metal lid 30 and the second metal lid 310 to move downwards.

[0043] By adopting the above technical solution, the resulting double-layer reinforced sealing structure utilizes its self-aligning characteristics to apply uniform and controllable clamping force to the first-stage seal 22, the second-stage seal 61, and the third-stage seal 62. This not only achieves redundant sealing protection but also significantly improves pressure resistance and leakage prevention capabilities through the synergistic effect of the three-stage seals.

[0044] Furthermore, cooking appliances generally require venting channels to expel steam generated during cooking. If a large amount of steam from the cooking cavity is directed into the gap 10 between the first metal cover 30 and the second metal cover 310, and then exits through this gap 10, the auxiliary sealing ring 6 will still be on the steam's exit path, and its extensive contact with steam will remain difficult to change. Therefore, a common practice is to install a silicone sealing ring at the interface between the first venting channel 91 and the first metal cover 30 to achieve a seal and prevent steam from entering the gap 10. However, this silicone sealing ring is located close to the first venting hole 307. During the process of steam exiting the cooking cavity through the first venting hole 307 and the first venting channel 91, it inevitably comes into contact with the silicone sealing ring, leading to discoloration, mold growth, and difficulty in cleaning. On the other hand, the exhaust channel is usually located inside the cover 3. When the first metal cover 30 is removable, the silicone sealing ring is directly exposed to the consumer after the first metal cover 30 is removed. This is not only unsightly, but also easily makes consumers worry about the cleanliness of the cooking cavity, affecting the user experience. In view of this, this application sets the first exhaust channel 91 and the first metal cover 30 to a direct metal-to-metal fit. The first exhaust channel 91 and the first metal cover 30 cooperate to form the fourth-level seal 94, and the fourth-level seal 94 is a rigid seal, so that no silicone parts are placed on the normal exhaust path of the cooking cavity.

[0045] It should be noted that, since the first metal cover 30 is in a floating state, the fourth-level seal 94 may still experience momentary micro-leakage during the floating process and when the pressure fluctuates within the cooking cavity. This application directs the leaked steam into the gap 10 between the first metal cover 30 and the second metal cover 310, and directionally discharges it through the second exhaust channel 92, without entering the receiving cavity of the main cover 32 or overflowing from the mating point between the cover 3 and the pot body 1. In other words, the adaptive capability of the first floating component 51 on the first metal cover 30 does not conflict with the fourth-level seal 94: the sealing uncertainty caused by the floating is mitigated by the gap 10 and the second exhaust channel 92. The fourth-level seal 94 only needs to maintain the connectivity and basic sealing of the passage during normal steam exhaust, without pursuing absolute zero leakage. This reduces the requirements for the fitting precision of the first exhaust channel 91 and the first metal cover 30, improving the feasibility of the process.

[0046] Understandably, the steam discharge volume of the first exhaust channel 91 is greater than that of the second exhaust channel 92. The large amount of steam formed in the metal cooking cavity is preferentially discharged through the first exhaust channel 91. In most cooking processes, the steam does not pass through the gap 10 and does not come into contact with the auxiliary sealing ring 6. The impact of the steam on the second-stage seal 61 is significantly reduced, and the steam discharge requirements of the gap 10 are also significantly reduced.

[0047] In summary, firstly, both the first-stage seal 22 and the fourth-stage seal 94 are rigid seals, allowing the metal cooking cavity to be established. Steam and food do not come into contact with the silicone parts under normal operating conditions, solving the problems of easy contamination, difficulty in cleaning, discoloration, and mold growth of the sealing ring. Secondly, the second-stage seal 61 is located outside the first-stage seal 22, blocking leaked steam inside and preventing it from reaching the junction of the lid 3 and the pot body 1, thus preventing it from overflowing and spreading from all sides. Thirdly, the third-stage seal 62 cuts off the passage from the gap 10 to the main lid 32 cavity, protecting the electrical components and plastic parts inside the lid 3. Fourthly, normal steam is discharged independently through the first exhaust channel 91 without passing through the gap 10. The gap 10 only collects a small amount of accidentally leaked steam and discharges it directionally through the second exhaust channel 92. The auxiliary sealing ring 6 is transformed from a "main sealing element" to an "auxiliary sealing ring 6 located outside the rigid seal," no longer on the necessary path of steam in the cooking cavity, thus simultaneously improving its lifespan, cleanliness, and the problems of mold and discoloration.

[0048] Furthermore, such as Figure 1 , Figure 9 As shown, the cover 3 includes a first floating component 51 and multiple second floating components 52. The first floating component 51 is located at the center of the cover 3, and the multiple second floating components 52 are arranged around the first floating component 51. With this arrangement, the first floating component 51 acts centrally on the central region of the first metal cover 30. It is understood that the first metal cover 30 is a thin metal piece, and its central region faces the metal cooking cavity. The area below this central region is a suspended area without support. Therefore, if excessive pressure is applied to the central region, the first metal cover 30 will deform and indent into the metal cooking cavity, thereby damaging the flatness of the mating surface between it and the inner liner 2, reducing the reliability of the first-stage seal 22. At the same time, the first metal cover 30 should be appropriately lifted to achieve floating pressure relief when the pressure in the cooking cavity increases. Excessive pressure will also weaken this ability.

[0049] In view of this, this application provides only one first floating component 51 in the central region of the first metal cover 30, and makes its elasticity less than that of the second floating component 52. On the one hand, since the central region is suspended and cannot be subjected to large clamping force, the first floating component 51 mainly plays the role of positioning and pre-pressing in the central region. The actual clamping force required by the first metal cover 30 is mainly provided by the second floating component 52 located on the outer periphery. Therefore, providing one first floating component 51 in the central region is sufficient to meet the requirements. If multiple first floating components 51 are provided in the central region, it is unnecessary and will form multiple stress points in the suspended thin plate area, causing the first metal cover 30 to produce uneven wavy deformation. On the other hand, the clamping force provided by the second floating component 52 is transmitted from the outside to the inside of the first metal cover 30 through the local contact part between the first metal cover 30 and the second metal cover 310. The outer periphery corresponds to the rim of the inner liner 2 and is directly supported by the inner liner 2, which can withstand a large clamping force without causing deformation, so that the application position of the clamping force corresponds to the support position.

[0050] Meanwhile, the first floating component 51 is centrally positioned so that it spatially avoids the first vent 307 located in the inner region of the first metal cover 30, and the second floating component 52 surrounds the outer periphery, avoiding the path of the first vent 91 ascending through the gap 10. Firstly, the second-stage seal 61 has a uniform and consistent circumferential clamping force, eliminating weak points in the seal caused by insufficient local clamping force and improving the consistency of batch products; secondly, the two floating components are spatially layered and do not interfere with each other, so the floating stroke of one stage will not be occupied by the other stage; thirdly, the central region of the cover 3 is cleared, allowing the first vent 91 to be centrally arranged and vertically ascending, resulting in the shortest venting path and the most compact structure.

[0051] Furthermore, after the lid is closed, the inner liner 2 presses against the first metal cap 30 and the second metal cap 310. The first metal cap 30 and the second metal cap 310 are respectively compressed upwards by the force applied to the first floating component 51 and the second floating component 52 until the first metal cap 30 and the second metal cap 310 are pressed tightly against the inner liner 2. Specifically, it can be understood that in the open state, the floating components on the lid 3, along with the first metal cap 30 and the second metal cap 310, are in a drooping state; during the closing process, the inner liner 2 remains stationary and has a large supporting force. The inner liner 2 provides an upward supporting force to the first metal cap 30 and the second metal cap 310, causing the first metal cap 30 and the second metal cap 310 to compress the floating components upwards, thereby achieving the effect of pressing the first metal cap 30 and the second metal cap 310 tightly against the inner liner 2. Since the floating components are always in a compressed state, their elastic restoring force is the clamping force of the two-stage seal. It has the following effects: First, the clamping force comes from the closing stroke itself, without the need for driving components such as motors, connecting rods, and buttons, resulting in a simple structure, low cost, and fewer potential failure points; Second, the clamping force is automatically released when the lid is opened, facilitating the disassembly and cleaning of the first metal cover 30 and the second metal cover 310; Third, the floating component retains a certain amount of residual compression stroke, which can automatically compensate for the height tolerance of the inner liner 2, placement skew, and thermal deformation of the first metal cover 30, ensuring that the clamping force will not change drastically or be completely lost due to fluctuations in part dimensions.

[0052] In one implementation, such as Figure 7 , 8As shown, the cover 3 also includes a steam valve 4 connected to the outside atmosphere. The first exhaust passage 91 and the second exhaust passage 92 are respectively connected to the steam valve 4. The steam valve 4 is provided with a converging exhaust passage 93 that is connected to the first exhaust passage 91 and the second exhaust passage 92 respectively. The steam valve 4 also includes a baffle, which is located above the outlet of the second exhaust passage 92 and spaced apart from the outlet of the second exhaust passage 92. In this manner, the steam from the first exhaust passage 91 and the second exhaust passage 92 is concentrated and discharged through the converging exhaust passage 93. The baffle covers the outlet of the second exhaust passage 92 and maintains a distance from the outlet. On the one hand, it does not close the outlet, ensuring that the gap 10 is always connected to the atmosphere. On the other hand, it forms a baffle between the outlet of the first exhaust passage 91 and the outlet of the second exhaust passage 92, preventing the high-speed steam flow discharged from the first exhaust passage 91 from being directly ejected from the outlet of the second exhaust passage 92. Of course, the converging steam exhaust channel 93 can also be located on the main cover 32. The two exhaust paths share the same exhaust port, reducing the number of steam holes on the cover surface, resulting in better appearance consistency and easier cleaning. The baffles form a flow deflector in a spaced arrangement, ensuring that leaked steam in the gap 10 can only be discharged in one direction and will not be back-pressed or backflowed due to the main flow, thus guaranteeing the reliability of leaked steam discharge. Thirdly, the baffles and the outlet are spaced apart rather than closed, so the gap 10 remains open at all times, preventing condensation from accumulating in the gap 10 after cooking.

[0053] In another embodiment, the cover 3 further includes a steam valve 4 communicating with the outside atmosphere. The steam valve 4 is provided with a main steam exhaust channel connected to the first steam exhaust channel 91 and an auxiliary steam exhaust channel connected to the second steam exhaust channel 92, so that the steam exhaust from the metal cooking cavity and the gap 10 are independent. The gas in the metal cooking cavity is discharged through the main steam exhaust port, and the gas in the gap 10 is discharged through the auxiliary steam exhaust port. Using the above method, the main steam exhaust channel and the auxiliary steam exhaust channel are not connected to each other in the steam valve 4, and the two paths are completely separated. Since the pressure in the metal cooking cavity is significantly higher than the pressure in the gap 10, completely separating the two steam exhaust paths can fundamentally eliminate the possibility of high-pressure steam backflow to the low-pressure side; at the same time, the flow cross-sections of the main steam exhaust channel and the auxiliary steam exhaust channel can be designed according to their respective steam exhaust volumes, with the flow cross-section of the main steam exhaust channel being larger than that of the auxiliary steam exhaust channel. The two exhaust paths do not interfere with each other. The steam in the low-pressure gap 10 will not be suppressed by the steam in the high-pressure cooking chamber, and the directional discharge of leaked steam is always effective. The possibility of steam flowing back into the metal cooking chamber within the gap 10 is completely eliminated, avoiding the backflow of condensate and foreign objects to contaminate the food. The flow cross-section of the two channels can be matched with their respective exhaust volumes. The main channel ensures normal exhaust and pressure control of the cooking chamber, while the auxiliary channel only needs to meet the discharge of a small amount of leaked steam. The overall exhaust is stable and the noise is low.

[0054] Furthermore, such as Figure 1 , Figure 3 , Figure 9 As shown, it also includes a mounting bracket 311 for mounting the second metal cover 310. Preferably, the second metal cover 310 is fixed on the mounting bracket 311 and clamps the auxiliary sealing ring 6 to form a second cover body 3. The second cover body 3 moves up and down relative to the main cover body 32 through the second floating component 52. It is understandable that the second cover 3 adopts a modular structure of "mounting bracket 311 + second metal cover 310 + auxiliary sealing ring 6", which has three functions: First, the mounting bracket 311 serves as the bearing base of the second cover 3, providing support and rigidity for the thin plate-shaped second metal cover 310, and preventing the second metal cover 310 from deforming under the action of floating pressure, thus affecting the flatness of the sealing surface; Second, the mounting bracket 311 provides the mounting position for the second metal cover 310 and the auxiliary sealing ring 6, and provides the force-bearing position for the floating component, so that the second cover 3 can withstand the floating pressure as a whole and float as a whole; Third, the second cover 3 can be detachably connected to the main cover 32 as a whole, and the second metal cover 310 can also be removed separately from the mounting bracket 311, which is convenient for users to clean.

[0055] Furthermore, to better achieve dual-stage floating and triple-stage sealing, the cover body 3 includes a main cover body 32, a second cover body 3, a first metal cover 30, a first floating component 51, and a second floating component 52. The second cover body 3 includes a mounting bracket 311 and a second metal cover 310. The first floating component 51 is disposed on the second cover body 3, and the second floating component 52 is disposed between the mounting bracket 311 and the main cover body 32. When the above scheme is adopted, in addition to the first floating component 51 and the second floating component 52 each having pre-pressure on the first metal cover 30 and the second cover body 3, there is also a linkage process. The second floating component 52 has a pressing force on the second cover body 3 and also provides a pressing force on the first floating component 51, further improving the sealing effect.

[0056] In one implementation, such as Figure 4 As shown, the second metal cover 310 and the mounting bracket 311 cooperate to form a mounting cavity 519. The first floating component 51 is installed in the mounting cavity 519 and partially extends to the outside of the second metal cover 310, abutting against the first metal cover 30. With the above structure, the main body of the first floating component 51 is accommodated in the mounting cavity 519 between the second metal cover 310 and the mounting bracket 311, without additionally occupying the axial height of the gap 10; its lower end extends from the second metal cover 310 and directly abuts against the upper surface of the first metal cover 30, thereby providing an independent downward force to the first metal cover 30 in addition to compressing the first floating component 51. It can be understood that at this time, the second floating component 52 both drives the second cover body 3 to float and press against the inner liner 2 through the mounting bracket 311, and directly applies a pressing force to the first metal cover 30, thus the two-stage floating forms a linkage. Therefore, the first floating component 51 is built into the mounting cavity 519, with a compact axial space, and does not interfere with the first exhaust passage 91 or the second floating component 52; the clamping force of the second floating component 52 is simultaneously transmitted to the second metal cover 310 and the first metal cover 30, forming a clamping force chain from the outside to the inside, so that the first-stage seal 22 obtains additional clamping force without having to increase the elasticity of the first floating component 51, thus not sacrificing the floating pressure relief capability of the first metal cover 30; the first floating component 51 is accommodated in the mounting cavity 519 and does not directly contact the leaked steam in the gap 10, reducing the risk of corrosion and jamming of metal parts such as springs.

[0057] In another implementation, such as Figure 4As shown, the first floating assembly 51 includes a first fixed plate 511, a first floating spring 510, and a metal protective cover 514. The first fixed plate 511 is fixed to the mounting bracket 311 by a first fastener 513. The metal protective cover 514 cooperates with the first fixed plate 511 to form a mounting cavity 519. The first floating spring 510 is disposed in the mounting cavity 519. The metal protective cover 514 partially extends out of the second metal cover 310 and abuts against the first metal cover 30. Of course, the first floating assembly 51 not only serves as an elastic support and abutment but can also be used to connect the first metal cover 30. Specifically, a magnet 515 is disposed in the mounting cavity 519, and the first metal cover 30 has a magnetic attraction part.

[0058] Furthermore, such as Figure 5 As shown, since springs are generally made of metal, in order to prevent magnet 515 from contacting the first floating spring 510, the first floating assembly 51 also includes a limiting member. The first floating spring 510 is located on the upper side of the limiting member, and the magnet 515 is located on the lower side of the limiting member.

[0059] Of course, the first floating component 51 may also include a magnetic suction component, a first guide post 512, and a first floating spring 510. One end of the magnetic suction component is located above the second cover 3 and is connected to the second cover 3 via the first guide post 512 and the first fastener 513; the other end of the magnetic suction component passes through the second cover 3 and is magnetically connected to the first metal cover 30. By adopting the above solution, the first metal cover 30 can be detachably installed, and a floating connection is achieved using the magnetic suction component, serving multiple purposes and simplifying the structure. In other words, the magnetic suction component can be eliminated.

[0060] Furthermore, such as Figure 9 As shown, the second floating component 52 includes a second guide post 522 connected to the upper surface of the mounting bracket 311 and a second floating spring 520 sleeved on the second guide post 522. The mounting bracket 311 is connected to the clearance hole of the main cover 32 through the second guide post 522 and the second fastener 523. The second guide post 522 moves up and down within the clearance hole of the main cover 32. Multiple second floating components 52 are provided on the mounting bracket 311.

[0061] Furthermore, after the lid is closed, the elastic force of the first floating component 51 is less than that of the second floating component 52, and the first metal cover 30 and the second metal cover 310 partially abut against each other, so that the second metal cover 310 applies a downward force to the first metal cover 30. It is understandable that, since the elastic force of the second floating component 52 is greater than that of the first floating component 51, the rebound amount of the second cover 30 during the compression process is greater than that of the first metal cover 30. The two tend to approach each other axially and abut against each other in a localized area. After abutting, the excess clamping force of the second floating component 52 is transmitted to the first metal cover 30 through the abutting portion, forming a force chain "from the outside in". The reason for using partial abutting rather than full contact is that the gap 10 still needs to be maintained between the first metal cover 30 and the second metal cover 310: the gap 10 is the collection cavity for leaked steam; if the two covers are fully abutted, this cavity disappears, and the leaked steam will have nowhere to go. Therefore, the abutment portion is configured as a local boss, support ring, or several support columns, while the remaining area retains a gap 10. Preferably, the abutment portion is located adjacent to the outer periphery of the first metal cover 30. It is understood that the central area of ​​the first metal cover 30 faces the metal cooking cavity and is suspended below without support. If the abutment portion is located in the central area, the pressing force transmitted from the second metal cover 310 will act on the unsupported suspended area, which may easily cause the first metal cover 30 to deform into the metal cooking cavity. By setting the abutment portion adjacent to the outer periphery of the first metal cover 30, the pressing force acts directly on the area corresponding to the rim of the inner pot 2 and directly supported by the inner pot 2. The application position of the pressing force corresponds to the support position, which can effectively enhance the first-stage seal 22 without causing deformation of the first metal cover 30.

[0062] Furthermore, the inner liner 2 is provided with a first mating surface and a second mating surface. The first mating surface and the second mating surface are formed on the rim of the inner liner 2. The second mating surface is located outside the first mating surface and is higher than the first mating surface. The first metal cap 30 and the first mating surface form a first-level seal 22, and the second metal cap 310 and the second mating surface form a second-level seal 61. A longitudinally extending barrier wall is provided on the outer periphery of the first mating surface. The barrier wall blocks steam that may accidentally leak from the first-level seal 22. With the above structure, steam leaking from the first-level seal 22 first flows radially outward, and is then intercepted by the longitudinally extending barrier wall, changing its flow direction. It is forced to rise along the barrier wall and then cross the barrier wall. This process reduces the steam velocity and attenuates the dynamic pressure. Subsequently, the steam enters the area between the first mating surface and the second mating surface and is guided into the gap 10 between the first metal cap 30 and the second metal cap 310. Since the second mating surface is higher than the first mating surface, the two-stage seals are located on different height planes. The pressing action of the second metal cover 310 does not interfere with the first metal cover 30, and the auxiliary sealing ring 6 does not need to cross two height differences at the same time, making the fit of its sealing lip more reliable.

[0063] Furthermore, the cover 3 also includes a heating element for heating the gap 10. This heating element can be opened at different stages of cooking and functions differently in conjunction with the opening and closing of the second exhaust channel 92. After cooking, opening the heating element and the second exhaust channel 92 allows any remaining condensate in the gap 10 to evaporate and be discharged through the second exhaust channel 92. During cooking, opening the heating element and the second exhaust channel 92 accelerates steam discharge. Opening the heating element and closing the second exhaust channel 92 increases the pressure within the gap 10, further tightening the first-stage seal 22 and reducing heat loss. Preferably, the heating element is positioned between the mounting bracket 311 and the second metal cover 310, i.e., the mounting bracket 311 and the second metal cover 310 cooperate to form a heating chamber. Furthermore, to ensure temperature rise safety, the heating element is positioned above the second metal cover 310; alternatively, the second cover 3 includes a second metal cover 310 and a mounting bracket 311, with the heating element positioned between the second metal cover 310 and the mounting bracket 311, the mounting bracket 311 being made of a high-temperature resistant material. Of course, for safety, a pressure relief valve can also be added, which can both supply air to the gap 10 and release pressure when it becomes excessive.

[0064] Furthermore, the first metal cover 30 is detachably connected to the cover body 3 via the second floating component 52, and the second metal cover 310 is fixed to the cover body 3. It is understood that the first metal cover 30 can be directly washed with water after removal, and its lower surface is completely free of silicone; simultaneously, the second metal cover 310 is also easy to clean after the first metal cover 30 is removed, requiring only a simple wipe.

[0065] As a specific form of detachable connection, it also includes a plug-in assembly, which includes a connecting post disposed on the upper surface of the first metal cover 30 and a plug-in hole located on the second cover 3, wherein the connecting post and the plug-in hole are interference fit.

[0066] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features from different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.

[0067] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A cooking utensil, comprising a lid, a pot body, and an inner pot disposed within the pot body, characterized in that, The cover includes: Main cover; A first metal lid, which, together with the inner pot, forms a metal cooking cavity; A second metal cover is located between the first metal cover and the main cover body, and a gap is formed between the first metal cover and the second metal cover. The first floating component drives the first metal cover to float and press against the inner liner. The first metal cover and the liner edge cooperate to form a first-level seal. The first-level seal is a rigid seal. The second floating component drives the second metal cover to float and press against the inner liner. The second metal cover and the liner edge cooperate to form a second-level seal. The second-level seal is located outside the first-level seal. An auxiliary sealing ring is provided on the outer ring of the second metal cover. The auxiliary sealing ring is provided with a first sealing part and a second sealing part. The outer edge of the second metal cover and the inner liner form a second-level seal through the first sealing part. The outer edge of the second metal cover and the first metal cover form a third-level seal through the second sealing part. The first exhaust passage has a first exhaust hole on the first metal cover. The metal cooking cavity is connected to the atmosphere through the first exhaust hole and the first exhaust passage. The first exhaust passage and the first metal cover cooperate to form a fourth-level seal. The fourth-level seal is a rigid seal. Steam that is accidentally leaked from the fourth-level seal is introduced into the gap. The second exhaust passage connects the gap to the atmosphere.

2. A cooking utensil according to claim 1, characterized in that, It includes a first floating component and a plurality of second floating components, wherein the first floating component is located at the center of the cover and the plurality of second floating components are arranged around the first floating component.

3. A cooking utensil according to claim 1 or 2, characterized in that, After the lid is closed, the inner liner presses against the first metal cover and the second metal cover. The first metal cover and the second metal cover are subjected to force to compress the first floating component and the second floating component upward, respectively, until the first metal cover and the second metal cover are pressed tightly against the inner liner.

4. A cooking utensil according to claim 1, characterized in that, It also includes a steam valve, which has a combined steam exhaust channel that is connected to the first steam exhaust channel and the second steam exhaust channel respectively. The steam valve also includes a baffle, which is located above the outlet of the second steam exhaust channel and is spaced apart from the outlet of the second steam exhaust channel.

5. A cooking utensil according to claim 1, characterized in that, It also includes a steam valve, which has a main steam exhaust channel connected to the first steam exhaust channel and an auxiliary steam exhaust channel connected to the second steam exhaust channel, so that the steam exhaust of the metal cooking cavity and the gap are independent.

6. A cooking utensil according to claim 1, characterized in that, It also includes a mounting bracket for mounting the second metal cover, the second metal cover being fixed on the mounting bracket and clamping the auxiliary sealing ring to form a second cover body, the second cover body being able to move up and down relative to the main cover body via the second floating component.

7. A cooking utensil according to claim 6, characterized in that, The second metal cover and the mounting bracket cooperate to form a mounting cavity, and the first floating component is installed in the mounting cavity and partially extends to the outside of the second metal cover to abut against the first metal cover.

8. A cooking utensil according to claim 1, characterized in that, After the lid is closed, the elastic force of the first floating component is less than that of the second floating component, and the first metal lid and the second metal lid partially abut against each other, so that the second metal lid applies a downward force to the first metal lid.

9. A cooking utensil according to claim 1, characterized in that, The inner liner has a first mating surface and a second mating surface. The first mating surface and the second mating surface are formed on the rim of the inner liner. The second mating surface is located outside the first mating surface and is higher than the first mating surface. The first metal cap and the first mating surface form a first-level seal. The second metal cap and the second mating surface form a second-level seal. The outer periphery of the first mating surface is provided with a longitudinally extending barrier wall. The barrier wall prevents steam from accidentally leaking from the first-level seal.

10. A cooking utensil according to claim 1, characterized in that, The cover also includes a heating element for heating the gap; or, the first metal cover is detachably connected to the cover via a second floating assembly, and the second metal cover is fixed to the cover; at least the inner surface of the inner liner and the lower surface of the first metal cover form a titanium metal layer.

Images