Spill-proof cooking utensil capable of uniformly breaking bubbles

Abstract

The anti-overflow cooking utensil comprises a pot body with a cooking cavity and a pot cover used for opening or closing the cooking cavity, the pot cover is provided with a steam valve assembly and a cold air opening communicated with the outside, and the steam valve assembly is provided with a mixing cavity and a steam exhaust opening communicated with the mixing cavity and the outside. The steam valve assembly comprises a steam exhaust pipe communicated with the cooking cavity, the steam outlet end of the steam exhaust pipe is located in the mixing cavity, the steam exhaust pipe is provided with a contraction section with the inner diameter contracted, the contraction section is provided with a plurality of introduction openings in the circumferential direction of the contraction section, and cold air introduced from the cold air opening is introduced into the contraction section through the introduction openings. And steam introduced into the steam exhaust pipe and cold air introduced from the cold air port are mixed in the steam exhaust pipe and then are discharged into the mixing cavity through the steam outlet end. According to the cooking utensil, external cold air can be guided into the contraction section through the multiple cold air openings and the multiple guide-in openings, the guide-in amount of the cold air is increased, and therefore the defoaming efficiency and the cooling efficiency are improved, and the anti-overflow effect of the cooking utensil is improved.

Description

Technical Field

[0001] This application belongs to the field of kitchen utensil technology, specifically relating to a cooking utensil that prevents overflow by uniformly breaking bubbles. Background Technology

[0002] When a rice cooker is cooking, heat is generated inside the cooking cavity, and the resulting steam is released through the steam vent on the lid. When cooking rice porridge or similar dishes, a lot of bubbles are produced. If the cooking heat is too high or continuous high heat is used, the bubbles, mixed with rice water, will overflow from the vent. This not only makes cleaning difficult but also, if the steam valve isn't cleaned promptly, the rice water at the vent will solidify, making cleaning even more difficult and potentially causing blockage and preventing steam from escaping. Using low heat to reduce heating power will result in longer cooking times, negatively impacting the user experience.

[0003] The prior art also discloses a jet-type bubble breaker for use in cooking appliances, including a housing and a steam inlet, a steam outlet, and a cold air inlet channel connected to the housing. The housing has an intermediate storage chamber, which is connected to the external space through the cold air inlet channel. The steam outlet of the steam inlet and the steam inlet of the steam outlet are both connected to the intermediate storage chamber. The cross-sectional dimension of the steam inlet channel of the steam inlet gradually decreases along the steam flow direction to form a jet stream in the steam inlet channel. The steam inlet of the steam outlet channel in the steam outlet is close to the steam outlet of the steam inlet channel to receive at least a portion of the jet stream ejected from the steam inlet channel. A negative pressure gap is maintained between the outlet of the steam inlet and the inlet of the steam outlet. This negative pressure gap is used to automatically introduce the cold air that has entered the intermediate storage chamber through the cold air inlet channel into the steam outlet channel to assist in bubble breaking by means of the relatively low pressure formed by the jet stream. While this jet-type bubble breaker can achieve a certain degree of bubble breaking, its steam inlet and outlet are coaxially arranged, and the axial dimension of the steam outlet is relatively short. This causes the high-speed jet from the steam inlet to be ejected directly from the steam outlet before it can break bubbles, resulting in overflow. If the axial dimension of the steam outlet is increased to solve this problem, the internal pressure of the steam outlet, due to its size and the steam within it, will be greater than the pressure at the negative pressure gap. This causes more of the cold air introduced from the cold air inlet channel to escape from the local low-pressure area at the steam outlet of the steam inlet and in the intermediate storage cavity, thus reducing its auxiliary bubble breaking performance and significantly decreasing the overflow prevention effect. Furthermore, the negative pressure gap in this technical solution is an open gap existing between the steam inlet and outlet. Cold air introduced from the cold air inlet channel located on one side of the intermediate storage cavity through the open negative pressure gap may not be evenly distributed throughout the bubble breaking area, resulting in poor bubble breaking effect in some areas and affecting the overall bubble breaking efficiency. Utility Model Content

[0004] This application provides a uniformly deflating anti-overflow cooking appliance to solve the technical problem that existing anti-overflow cooking appliances that use the Venturi tube principle to introduce cold air into the steam valve to achieve deflating have uneven cold air introduction and poor deflating effect, resulting in the anti-overflow effect not meeting expectations.

[0005] The technical solution adopted in this application is as follows:

[0006] A uniformly bubble-breaking, overflow-preventing cooking appliance includes a pot body with a cooking cavity and a lid for opening or closing the cooking cavity. The lid is provided with a steam valve assembly and a cold air vent communicating with the outside. The steam valve assembly has a mixing cavity and a steam vent communicating with the outside. The steam valve assembly includes a steam vent pipe communicating with the cooking cavity. The steam outlet of the steam vent pipe is located inside the mixing cavity, and the steam vent pipe has a constriction section with a narrowed inner diameter. The constriction section has multiple inlets along its circumference. Cold air introduced by the cold air vent is introduced into the constriction section through the multiple inlets, so that the steam introduced into the steam vent pipe mixes with the cold air introduced from the cold air vent in the steam vent pipe and is then discharged into the mixing cavity through the steam outlet.

[0007] The exhaust pipe of this application is equipped with a contraction section with a narrowing inner diameter. This contraction section accelerates the steam flow before it reaches the cooking chamber, causing a pressure drop. This pressure and velocity change leads to a sudden change in the surface tension of the steam bubbles, resulting in bubble breakage or the reduction of large bubbles into smaller ones. Furthermore, cold air introduced through the air vent is directed to this contraction section. According to the Venturi principle, the cold air from the outside is introduced into this low-pressure area, further impacting the bubbles. This not only defoams the bubbles but also cools them, causing them to condense into liquid, further enhancing the defoaming effect. Even during high-power cooking, there will be no continuous bubble overflow from the steam valve assembly's exhaust port, significantly improving the anti-overflow effect of the cooking appliance.

[0008] Furthermore, the inclusion of a contraction section on the exhaust pipe in this application, along with the placement of the exhaust pipe's outlet within the mixing chamber, allows for multiple mixing processes between the steam and the low-temperature gas. Specifically, as the steam passes through the contraction section, the steam introduced through the exhaust pipe mixes with the cold air introduced through the cold air inlet within the exhaust pipe, resulting in a slight reduction in the temperature of the high-temperature steam. After this initial mixing, the steam exits through the outlet into the mixing chamber. Because the mixing chamber has a larger space than the exhaust pipe, a second, more thorough mixing occurs, further reducing the temperature of the high-temperature steam. Consequently, some of the high-temperature steam can liquefy to form condensate, reducing the water content in the steam and ultimately minimizing the discharge of high-temperature steam from the exhaust port. The presence of the mixing chamber also provides space for condensate collection.

[0009] Building upon this, the contraction section of this application is equipped with multiple inlets along its circumference, allowing external cold air to be introduced into the contraction section through the cold air inlet and multiple inlets. This increases the amount of cold air introduced, thereby improving defoaming efficiency and cooling efficiency, and further enhancing the anti-overflow effect of the cooking appliance. Moreover, the design of multiple inlets allows the cold air to mix evenly with the steam, reducing turbulence and fluctuations during steam flow. This not only improves the stability of the steam discharge process but also helps to reduce exhaust noise, enhancing the user experience.

[0010] The multiple inlets are distributed in a fan shape along the circumference of the contraction section.

[0011] In this technical solution, multiple inlets are arranged in a fan shape along the circumference of the contraction section. This allows cold air to enter evenly along the circumference of the contraction section, avoiding uneven airflow caused by too much or too little cold air in certain areas. This evenly distributed cold air can mix better with steam, improving the condensation and defoaming effect and reducing the risk of steam overflow. Moreover, the circumferentially fan-shaped inlet design ensures more thorough mixing of cold air and steam, rapidly reducing the steam temperature and thus improving defoaming efficiency, further reducing the risk of overflow. Furthermore, the fan-shaped inlets can guide the cold air to flow along the inner wall of the contraction section, reducing turbulence during cold air and steam mixing and lowering noise during steam discharge.

[0012] The central angle corresponding to the sector is α, and α satisfies: α≥180°.

[0013] This technical solution, by limiting the central angle corresponding to the fan-shaped distribution of the inlet ports, allows for a wider circumferential distribution range of the cold air inlets. This enables more uniform introduction of cold air into the contraction section, significantly increasing the contact area between the cold air and steam. This allows for more uniform mixing of the cold air and steam, resulting in a more efficient reduction in steam temperature, accelerating the condensation process, and helping to reduce condensate accumulation in the contraction section. Furthermore, by expanding the distribution range of the inlets, turbulence and local pressure fluctuations generated when the cold air enters are reduced, leading to a smoother mixing of the cold air and steam, thus reducing condensate accumulation caused by pressure changes. In addition, a wider inlet coverage area better disperses the impact force of the cold air, reducing pressure concentration on the contraction section structure caused by the cold air introduction. This lowers the probability of deformation of the exhaust pipe and ensures that the steam flows along a predetermined path, improving the stability of the steam flow.

[0014] The plurality of inlets are evenly distributed along the circumference of the contraction section, and the included angle between two adjacent inlets is equal.

[0015] The uniformly distributed inlets in this technical solution ensure that cold air enters evenly circumferentially within the contraction section, avoiding uneven airflow caused by excessive or insufficient local cold air introduction. This uniform cold air distribution allows for more effective mixing of cold air and steam, reducing steam temperature and thus improving condensation efficiency. Furthermore, the uniformly distributed inlets reduce turbulence and local pressure fluctuations generated during cold air entry, contributing to smoother mixing of cold air and steam and reducing exhaust noise. Moreover, the uniformly distributed cold air inlets more effectively defoam, reducing liquid splashing caused by bubble bursting, lowering defoaming noise, and facilitating condensate collection in the mixing chamber.

[0016] There is an odd number of inlets, and the multiple inlets are symmetrically distributed about the axis of one of the inlets.

[0017] In this technical solution, there is an odd number of inlets, and multiple inlets are symmetrically distributed with one of them as the axis of symmetry. This ensures that the introduction of cold air into the contraction section is more uniform and balanced within the limited structural space of the exhaust pipe, reducing local pressure differences caused by uneven cold air introduction and improving the stability of steam flow.

[0018] The plurality of inlets are spirally distributed along the circumference of the contraction section, such that there is a gap between two adjacent inlets in both the circumference and axial direction of the contraction section; or, the plurality of inlets are staggered in the circumference of the contraction section, such that there is an interlacing distance between two adjacent inlets in both the circumference and axial direction of the contraction section.

[0019] In this technical solution, multiple inlets are spirally distributed along the circumference of the contraction section. This allows for uniform distribution of cold air along both the circumference and axial direction at the contraction section, guiding the airflow along the spiral path into the contraction section. This creates a more stable condensation path, enabling the cold air to mix more effectively with the steam, reducing the steam temperature, and thus improving condensation efficiency. Furthermore, the spirally distributed inlets can disperse the impact force of the cold air on the contraction section, reducing pressure concentration and lowering the probability of deformation of the exhaust pipe due to pressure.

[0020] In this technical solution, the multiple inlets are circumferentially staggered along the contraction section, which enables the staggered entry of cold air, thereby reducing turbulence caused by collisions and friction of the cold air. This not only helps stabilize the flow of steam, but also reduces energy loss caused by collisions and friction, allowing the cold air to mix effectively with the steam, thus improving the defoaming and condensation effects.

[0021] The steam valve assembly also includes multiple inlet pipes, through which external cold air enters the contraction section from the cold air inlet, the inlet pipes, and the inlet.

[0022] This technical solution, by incorporating inlet pipes, creates a guiding path for the cold air from the cold air inlet to the inlet, allowing as much cold air as possible to enter the contraction section, thus aiding steam condensation and bubble breaking. Furthermore, the design of multiple inlet pipes disperses the entry points of the cold air, further reducing turbulence and local pressure fluctuations during cold air entry. Moreover, the synergistic effect of multiple inlet pipes and inlets reduces the steam valve assembly's dependence on a single inlet, minimizing the occurrence of cold air being unable to enter the contraction section due to blockage at a single inlet. This technical solution significantly optimizes the cold air introduction path and utilization efficiency, improving overflow prevention.

[0023] The inlet pipe is provided with a sealing element that abuts against and seals the cold air inlet.

[0024] This technical solution, by setting a seal between the inlet pipe and the cold air inlet, can prevent steam from overflowing from the joint between the inlet pipe and the cold air inlet, ensuring that the steam can flow in the steam valve assembly according to the preset flow path. This not only improves the anti-overflow effect by optimizing the steam flow path, but also ensures that the steam is discharged from the exhaust port, avoiding the illusion of a lid malfunction caused by multiple leaks.

[0025] The inlet pipe and the sealing element are integrally formed.

[0026] This technical solution, by designing the inlet pipe and sealing element as a single molded structure, eliminates the increased processing and assembly steps required for separate molding, thus improving assembly efficiency. Furthermore, the integrated molding eliminates concerns about air leakage at the connection point between the inlet pipe and the sealing element during assembly with the air vent; only a tight seal between the air vent and the sealing element is needed. Moreover, the integrated design makes the inlet pipe and sealing element a single unit, enhancing the overall structural strength and durability. This allows the inlet pipe to better withstand the pressure and impact of incoming cold air, reducing structural damage caused by long-term use.

[0027] The air inlet is provided in multiple locations, and multiple inlet pipes share one sealing element.

[0028] In this technical solution, multiple inlet pipes share a single seal to achieve a tight seal with multiple air inlets. This not only reduces the number of sealing points and lowers the risk of leakage caused by multiple sealing points, but also reduces the number of parts and assembly steps, lowering production costs and assembly complexity, and minimizing installation errors caused by multiple seals. Furthermore, when steam leakage occurs at the connection point between the inlet pipe and the air inlet, the leakage problem can be solved by replacing a single seal, eliminating the need to inspect, troubleshoot, and replace multiple seals individually, significantly reducing maintenance time. Attached Figure Description

[0029] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0030] Figure 1 This is a cross-sectional view of the pot lid according to one embodiment of this application;

[0031] Figure 2 for Figure 1 An enlarged view of part A, with arrows and indicator lines indicating the direction of steam flow;

[0032] Figure 3 This is a perspective view of the exhaust pipe according to one embodiment of this application;

[0033] Figure 4 This is a cross-sectional view of the exhaust pipe according to one embodiment of this application. Figure 1 ;

[0034] Figure 5 This is a cross-sectional view of the exhaust pipe according to one embodiment of this application. Figure 2 ;

[0035] Figure 6 This is a perspective view of the exhaust pipe according to another embodiment of this application;

[0036] Figure 7 This is a cross-sectional view of the exhaust pipe according to another embodiment of this application;

[0037] Figure 8 This is a perspective view of the exhaust pipe according to another embodiment of this application;

[0038] Figure 9 This is a cross-sectional view of the exhaust pipe according to another embodiment of this application.

[0039] in,

[0040] 1. Exhaust pipe; 11. Steam inlet passage; 12. Exhaust passage; 13. Contraction section; 131. Inner sleeve; 132. Outer sleeve; 133. Inlet; 14. Installation part;

[0041] 2. Mixing chamber;

[0042] 3. Inlet pipe; 31. Connector;

[0043] 4. Valve cover; 41. Exhaust port; 42. Cold air inlet;

[0044] 5. First sealing element;

[0045] 6. Second sealing element;

[0046] 7. Liner;

[0047] 8. Inner cover;

[0048] 9. Reflux valve. Detailed Implementation

[0049] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0050] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0051] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0054] like Figure 1 and Figure 2As shown, a uniformly bubble-breaking, overflow-proof cooking appliance includes a pot body with a cooking cavity and a pot lid for opening or closing the cooking cavity. The pot lid is provided with a steam valve assembly and a cold air vent 42 communicating with the outside. The steam valve assembly has a mixing chamber 2 and a steam vent 41 communicating with the outside. The steam valve assembly includes a steam vent pipe 1 communicating with the cooking cavity. The steam outlet end of the steam vent pipe 1 is located in the mixing chamber 2, and the steam vent pipe 1 has a contraction section 13 with a narrowed inner diameter. The contraction section 13 has multiple inlets 133 along its circumference. The cold air introduced by the cold air vent 42 is introduced into the contraction section 13 through the multiple inlets 133, so that the steam introduced into the steam vent pipe 1 and the cold air introduced from the cold air vent 42 are mixed in the steam vent pipe 1 and then discharged into the mixing chamber 2 through the steam outlet end.

[0055] The exhaust pipe 1 of this application is provided with a contraction section 13 with a narrowed inner diameter. This allows steam to flow faster at the contraction section 13 before reaching the cooking chamber, resulting in a pressure drop. This pressure and flow rate change causes a sudden change in the surface tension of the bubbles, leading to bubble breakage or the reduction of large bubbles into smaller ones. Furthermore, cold air introduced through the cold air inlet is introduced into the contraction section 13. According to the Venturi principle, the cold air from the outside is introduced into this low-pressure area, further impacting the bubbles. This not only defoams the bubbles but also cools them, causing them to condense into liquid, further enhancing the defoaming effect. Even during high-power cooking, there will be no continuous bubble overflow at the exhaust port 41 of the steam valve assembly, significantly improving the anti-overflow effect of the cooking appliance.

[0056] Furthermore, the inclusion of the contraction section 13 on the exhaust pipe 1 in this application, and the placement of the steam outlet of the exhaust pipe 1 within the mixing chamber 2, allows for multiple mixing of the steam and the low-temperature gas. Specifically, as the steam passes through the contraction section 13, the steam introduced from the exhaust pipe 1 mixes with the cold air introduced from the cold air inlet within the exhaust pipe 1 for the first time, resulting in a slight reduction in the temperature of the high-temperature steam. After this first mixing, the steam exits through the outlet into the mixing chamber 2. Because the mixing chamber 2 has a larger space than the exhaust pipe 1, a second, more thorough mixing occurs, further reducing the temperature of the high-temperature steam. Consequently, some of the high-temperature steam can liquefy to form condensate, reducing the water content in the steam and ultimately decreasing the amount of high-temperature steam discharged from the exhaust port 41. The presence of the mixing chamber 2 also provides space for condensate collection.

[0057] Based on this, the contraction section 13 of this application is provided with multiple inlets 133 along its circumference, allowing external cold air to be introduced into the contraction section 13 through the cold air inlet 42 and the multiple inlets 133, increasing the amount of cold air introduced, thereby improving defoaming efficiency and cooling efficiency, and further enhancing the anti-overflow effect of the cooking appliance. Moreover, the design of the cold air inlet 42 and the inlets 133 allows the cold air to mix evenly with the steam, reducing turbulence and fluctuations during steam flow, which not only improves the stability of the steam discharge process but also helps reduce exhaust noise, enhancing the user experience. Multiple inlets refer to two or more inlets, such as 2, 3, or 4.

[0058] It should be noted that this application does not limit the number of air vents 42. There can be one air vent 42 or multiple air vents 42. Multiple air vents refer to two or more air vents 42, such as two, three, four, five, six, etc.

[0059] The exhaust pipe 1 includes an inlet steam passage 11 and an exhaust steam passage 12. The inlet steam passage 11 and the exhaust steam passage 12 can be composed of two detachable sections or can be a single integrated exhaust pipe 1. When it is a single integrated exhaust pipe 1, along the steam flow direction, the front part of the exhaust pipe 1 corresponds to the inlet steam passage 11, and the rear part of the exhaust pipe corresponds to the exhaust steam passage 12.

[0060] In a preferred embodiment, such as Figure 1 , Figure 2 and Figure 4 As shown, there is a bend between the steam inlet channel 11 and the steam outlet channel 12. This design allows the steam generated in the cooking chamber to be blocked and redirected when entering the steam outlet pipe 1, enabling liquefaction and condensation of the steam during the redirection process. Especially during the cooking of rice or soup, rice water, starch, or small ingredients may enter the steam inlet channel 11 as the cooking chamber boils. Because of the bend, these ingredients are blocked and fall back into the cooking chamber, reducing the chance of the steam outlet pipe 1 becoming blocked.

[0061] In this application, the steam outlet of the exhaust passage 12 is connected to the mixing chamber 2. When the fluid flowing out from the steam outlet of the exhaust passage 12 enters the mixing chamber 2, it undergoes a pressure release process. This pressure change helps to break bubbles, thereby further eliminating unbroken bubbles. After the foam breaks, it will be buffered in the mixing chamber 2 under its own weight to avoid clogging the exhaust port 41. Moreover, the foam breaking at the connection point caused by the pressure change between the steam outlet of the exhaust passage 12 and the mixing chamber 2 can reduce the resistance of the exhaust passage, allowing steam and foam to be discharged more smoothly and improving exhaust efficiency.

[0062] Furthermore, if the foam cannot be broken in time during the steam discharge process, the presence of the foam will generate local disturbances and resistance in the steam flow. These disturbances and resistances can easily lead to turbulence in the steam flow process, thereby increasing the noise. This application can achieve foam breaking before the steam flows into the mixing chamber 2 through the cooperation of the contraction section 13 and the introduction of cold air. After the foam breaks, these local disturbances and resistances are reduced, the steam flow is smoother, and the fluid interface becomes more continuous, thereby reducing the generation of turbulence and significantly reducing the exhaust noise.

[0063] As a preferred embodiment of this application, such as Figure 1 As shown, the pot lid includes a liner 7 and an inner cover 8 detachably mounted on the liner 7. The steam valve assembly includes a valve cover 4 mounted on the liner 7. The valve cover 4 may also be integrally formed on the liner 7. The liner 7 and / or the valve cover 4 are provided with a first sealing element 5, which has a lower sealing lip capable of sealing against the upper surface of the inner cover 8. The valve cover 4, the first sealing element 5, and the inner cover 8 cooperate to form a mixing chamber 2. The exhaust pipe 1 is installed on the inner cover 8 and can be removed from the liner 7 along with the inner cover 8, facilitating thorough cleaning of the inner cover 8 and the exhaust pipe 1 by the user. After the inner cover 8 is removed, the mixing chamber 2 can be directly exposed to the user's view, allowing for thorough cleaning of the inner wall of the mixing chamber 2 and preventing the accumulation of dirt and grime in the steam valve assembly, which could lead to bacterial growth. Furthermore, the exhaust pipe 1 is detachably mounted on the inner cover 8 for disassembly and cleaning. Specifically, the inner cover 8 has a steam outlet, and the exhaust pipe 1 is connected to the steam outlet. The exhaust pipe 1 has a mounting part 14 at its lower end, which is used to connect and install with the steam outlet. In a preferred embodiment, the exhaust pipe 1 is a silicone tube with a groove at its lower end, and the inner cover 8 is a metal inner cover 8, which is connected and installed with the steam outlet by deformation of the groove. In other embodiments, the exhaust pipe 1 can also be connected and installed with the steam outlet by means of threads or snaps.

[0064] Preferably, such as Figure 1 As shown, the inner cover 8 is provided with a reflux hole and a reflux valve 9 that is floating on the inner cover 8 to open or close the reflux hole. When the pressure in the cooking chamber rises to a certain threshold, it can push the reflux valve 9 to float up to close the reflux hole and prevent steam from flowing back into the mixing chamber 2. When the pressure in the cooking chamber drops to a certain threshold, the reflux valve 9 falls down under its own weight and the weight of the liquid in the mixing chamber 2 to open the reflux hole, and the liquid accumulated in the mixing chamber 2 falls back into the cooking chamber through the reflux hole. Furthermore, a part of the inner cover 8 is sunken to form a liquid collection tank communicating with the mixing chamber 2, so that the mixing chamber 2 can collect condensate and soup that falls back after the bubbles are broken. The reflux hole is located on the bottom wall of the liquid collection tank to facilitate liquid reflux.

[0065] This application does not specify the structural form of the contraction section on the exhaust pipe, and it can adopt any of the following embodiments:

[0066] Implementation method one: such as Figure 2 and Figure 4 As shown, the exhaust pipe 1 is provided with an inner sleeve 131. The end region of the inner sleeve 131 is narrower than the rest of the inner sleeve 131 to form a constriction section. The exhaust pipe 1 also has an outer sleeve 132 that is sleeved on the outside of the inner sleeve 131. The inner sleeve 131 and the outer sleeve 132 cooperate with each other to form a constriction section 13. The inlet 133 is provided on the outer sleeve 132.

[0067] Implementation Method 2: This implementation method is not illustrated. In this implementation method, the inner diameter of a certain area of ​​the exhaust pipe is significantly narrower than that of other areas, so as to form a narrowing section in the narrowing inner diameter area.

[0068] Implementation Method 3: This implementation method is not illustrated. In this implementation method, the steam valve assembly is further provided with an inlet pipe that communicates with the exhaust pipe. One end of the inlet pipe extends into the exhaust pipe, so as to reduce the cross-sectional area through which steam actually passes in the part of the exhaust pipe into which the inlet pipe extends, thereby forming a contraction section in the exhaust pipe area into which the inlet pipe extends.

[0069] This application does not limit the distribution of multiple inlets on the contraction section, and any of the following embodiments can be adopted:

[0070] Implementation Method Four: (e.g.) Figure 5 As shown, multiple inlets 133 are distributed in a fan shape along the circumference of the contraction section 13. In this fourth embodiment, the fan-shaped distribution of multiple inlets 133 along the circumference of the contraction section 13 allows cold air to enter evenly along the circumference of the contraction section 13, avoiding uneven airflow caused by too much or too little cold air in certain areas. This evenly distributed cold air can mix better with steam, improving the condensation and defoaming effect and reducing the risk of steam overflow. Moreover, the circumferentially fan-shaped distribution of inlets 133 allows for more thorough mixing of cold air and steam, which can quickly reduce the steam temperature, thereby improving the defoaming efficiency and further reducing the risk of overflow. Furthermore, the fan-shaped distribution of inlets 133 can guide the cold air to flow along the inner wall of the contraction section 13, reducing turbulence during the mixing of cold air and steam and reducing noise during the steam discharge process.

[0071] As a preferred embodiment of this fourth implementation method, such as Figure 5As shown, the central angle corresponding to the sector is α, where α satisfies: α ≥ 180°. By limiting the central angle corresponding to the sector of the distribution of the inlet 133, the circumferential distribution range of the cold air inlet 133 can be wider, allowing for more uniform introduction of cold air into the contraction section 13. This significantly increases the contact area between the cold air and steam, enabling more uniform mixing of the cold air and steam, thereby more efficiently reducing the steam temperature, accelerating the condensation process, and helping to reduce the accumulation of condensate in the contraction section 13. Moreover, by expanding the distribution range of the inlet 133, turbulence and local pressure fluctuations generated when the cold air enters can be reduced, making the mixing of cold air and steam more stable, thus reducing the accumulation of condensate due to pressure changes. Furthermore, by making the coverage range of the inlet 133 wider, the impact force of the cold air can be better dispersed, reducing the pressure concentration caused by the introduction of cold air on the structure of the contraction section 13, thereby reducing the probability of deformation of the exhaust pipe 1 under stress, and allowing the steam flow to follow a preset path, improving the stability of the steam flow.

[0072] Furthermore, α satisfies: 180°≤α≤210°, thus taking into account both the uniformity of air intake and the limited structural space of the steam valve assembly.

[0073] As a preferred embodiment of this fourth implementation method, such as Figure 5 As shown, multiple inlets 133 are evenly distributed circumferentially along the contraction section 13, with equal angles between adjacent inlets 133. This uniform distribution of inlets 133 ensures that cold air enters the contraction section 13 evenly circumferentially, avoiding uneven airflow caused by excessive or insufficient local cold air intake. This uniform cold air distribution allows for more effective mixing of cold air and steam, reducing steam temperature and thus improving condensation efficiency. Furthermore, the uniform distribution of inlets 133 reduces turbulence and local pressure fluctuations generated during cold air entry, contributing to smoother mixing of cold air and steam and reducing exhaust noise. Moreover, the uniform distribution of cold air inlets 133 more effectively defoams, reducing liquid splashing caused by bubble bursting, thus lowering defoaming noise and facilitating the collection of condensate in the mixing chamber 2.

[0074] Furthermore, such as Figure 5 As shown, the axis of each inlet 133 is perpendicular to the axis of the contraction section 13. When the steam in the cooking cavity is discharged through the exhaust pipe 1, it has a certain flow velocity and inertia. Since the axis of each inlet 133 is arranged perpendicular to the axis of the contraction section 13, the steam will hardly escape from the inlet 133. Instead, due to the flow of steam, the pressure at the contraction section 13 decreases, allowing the inlet 133 to introduce cold air from the outside, thereby achieving the purpose of defoaming.

[0075] The number of inlets 133 can be odd or even. In practical applications, the number of inlets 133 can be determined based on the size of the steam valve assembly and the size of the exhaust pipe 1. Preferably, as shown... Figure 3 and Figure 5 As shown, there is an odd number of inlets 133, and the multiple inlets 133 are symmetrically distributed with the axis of one of the inlets 133 as the axis of symmetry. This design can ensure that the introduction of cold air in the contraction section 13 is more uniform and balanced within the limited structural space of the exhaust pipe 1, reduce the local pressure difference caused by uneven introduction of cold air, and improve the stability of steam flow.

[0076] Implementation Method 5: This implementation method 5 is not illustrated. In this implementation method 5, multiple inlets are spirally distributed along the circumference of the contraction section so that there is a gap between two adjacent inlets along both the circumference and axial direction of the contraction section.

[0077] In this fifth embodiment, multiple inlets are spirally distributed along the circumference of the contraction section. This allows the cold air to be evenly distributed circumferentially and axially in the contraction section, guiding the airflow along the spiral path into the contraction section, forming a more stable condensation path. This enables the cold air to mix more effectively with the steam, reducing the steam temperature and thus improving condensation efficiency. Furthermore, the spirally distributed inlets can disperse the impact force of the cold air on the contraction section, reducing pressure concentration in the contraction section and lowering the probability of the exhaust pipe being deformed under pressure.

[0078] Implementation Method Six: This implementation method six is ​​not illustrated. In this implementation method six, multiple inlets are staggered in the circumferential direction of the contraction section so that there is an interlacing distance between adjacent inlets in both the circumferential and axial directions of the contraction section.

[0079] In this sixth embodiment, the multiple inlets are staggered circumferentially distributed along the contraction section, which enables the staggered entry of cold air, thereby reducing turbulence caused by collisions and friction of the cold air. This not only helps stabilize the flow of steam but also reduces energy loss caused by collisions and friction, allowing the cold air to mix effectively with the steam and improving the defoaming and condensation effects.

[0080] This application does not limit the method of introducing cold air, which can be any of the following embodiments:

[0081] Implementation Method 7: This implementation method 7 is not illustrated. In this implementation method 7, there is no drainage structure between the cold air inlet and the inlet. The cold air entering from the cold air inlet is connected to the inlet through the mixing chamber.

[0082] Implementation Method 8: The steam valve assembly includes multiple inlet pipes, and the pot lid has multiple cold air ports. Each inlet pipe is connected to each cold air port one by one, or the air inlet end of each inlet pipe extends to the outside through the cold air port. Each inlet pipe has only a short section, and the air outlet end of the inlet pipe is connected to the mixing chamber, thereby realizing the transmission of cold air through the mixing chamber. Figure 3 As shown, it provides a specific example of a steam valve assembly with three inlet pipes. For example... Figure 6 and Figure 7 As shown, it provides a specific example of a steam valve assembly with two inlet pipes.

[0083] Implementation Method Nine: This implementation method nine is not illustrated. In this implementation method nine, the steam valve assembly includes multiple inlet pipes, each inlet pipe is connected to an inlet, and each inlet pipe has only a small section, that is, the outlet end of the inlet pipe is connected to the inlet, and the inlet end of the inlet pipe is connected to the mixing chamber, thereby realizing the transmission of cold air by means of the mixing chamber.

[0084] Implementation Method 10: The steam valve assembly includes an inlet pipe with multiple connectors at one end. Each connector is connected to a cold air inlet. The outlet end of the inlet pipe covers multiple inlets, or each connector is connected to an inlet. The inlet end of the inlet pipe is connected to a cold air inlet, so that cold air can be guided from the cold air inlet to the inlet through a single inlet pipe. Figure 8 and Figure 9 As shown, it provides a specific example of a steam valve assembly having an inlet pipe 3, the inlet pipe 3 having two connectors 31, each connector 31 being connected to two inlets 133 respectively, and the air inlet end of the inlet pipe 3 being connected to a cold air inlet 42.

[0085] Implementation method eleven: as follows Figures 2 to 4 As shown, the steam valve assembly also includes multiple inlet pipes 3. The inlet end of each inlet pipe 3 is connected to a cold air port 42, or the inlet end of each inlet pipe 3 extends to the outside. The outlet end of each inlet pipe 3 is connected to an inlet port 133. External cold air enters the contraction section 13 from the cold air port 42, the inlet pipes 3, and the inlet port 133. By setting the inlet pipes 3, a guiding path can be formed for the cold air from the cold air port 42 to the inlet port 133, allowing as much cold air as possible to enter the contraction section 13, thus aiding steam condensation and bubble breaking. Furthermore, the design of multiple inlet pipes 3 can disperse the entry points of the cold air, further reducing turbulence and local pressure fluctuations during cold air entry. Moreover, the synergistic effect of multiple inlet pipes 3 and multiple inlet ports 133 can reduce the steam valve assembly's dependence on a single inlet port 133, reducing the occurrence of cold air being unable to enter the contraction section 13 due to blockage of a single inlet port 133. This technical solution significantly optimizes the cold air introduction path and utilization efficiency, and improves the overflow prevention effect.

[0086] As a preferred embodiment of this eleventh implementation method, such as Figures 2 to 5 As shown, the inlet pipe 3 is provided with a second sealing element 6 that abuts against and seals the cold air port 42. By providing the second sealing element 6 between the inlet pipe 3 and the cold air port 42, steam can be prevented from overflowing from the joint between the inlet pipe 3 and the cold air port 42, ensuring that the steam can flow in the steam valve assembly according to the preset flow path. This not only improves the anti-overflow effect by optimizing the steam flow path, but also ensures that the steam is discharged from the exhaust port 41, avoiding multiple leaks that could give users the illusion of a lid malfunction.

[0087] In one example, the inlet tube 3 and the second seal 6 are formed separately, and then the second seal 6 is installed on the inlet tube 3.

[0088] In another example, the inlet pipe 3 and the second seal 6 are integrally formed. By making the inlet pipe 3 and the second seal 6 an integral structure, the increased processing and assembly steps caused by separate molding can be eliminated, improving assembly efficiency. Moreover, since they are integrally formed, there is no need to worry about air leakage at the connection point between the inlet pipe 3 and the second seal 6 during the assembly process with the air inlet 42; only the seal between the air inlet 42 and the second seal 6 needs to be ensured. Furthermore, the integral design makes the inlet pipe 3 and the second seal 6 a single unit, enhancing the overall structural strength and durability. This allows the inlet pipe 3 to better withstand the pressure and impact of cold air introduction, reducing structural damage caused by long-term use.

[0089] Furthermore, this embodiment eleven does not limit the number of second seals 6. In one example, one inlet pipe is equipped with one second seal. In another example, such as... Figure 3 As shown, multiple inlet pipes 3 share a single second seal 6. This shared seal 6 achieves a tight seal with multiple air inlets 42, reducing the number of sealing points and lowering the risk of leakage. It also reduces the number of parts and assembly steps, lowering production costs and assembly complexity, and minimizing installation errors caused by multiple second seals 6. Furthermore, if steam leakage occurs at the connection point between the inlet pipe 3 and the air inlet 42, the leakage can be resolved by replacing only one second seal 6, eliminating the need to inspect, troubleshoot, and replace multiple seals individually, significantly reducing maintenance time.

[0090] In the above embodiments where the exhaust pipe 1 and the inlet pipe 3 are connected at their outlet ends, the connection method between the exhaust pipe 1 and the inlet pipe 3 is not limited. In one embodiment, the exhaust pipe 1 and the inlet pipe 3 are integrally formed, for example, silicone material can be used to integrally form the exhaust pipe 1 and the cold air inlet pipe 3 to facilitate manufacturing and forming. In another embodiment, the exhaust pipe 1 and the inlet pipe 3 are detachably connected and assembled together, for example, by means of threaded connection.

[0091] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0092] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0093] The above descriptions are merely embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A spilling-preventing cooking appliance in which bubbles are uniformly broken, comprising a pan body having a cooking cavity and a pan cover for opening or closing the cooking cavity, characterized in that, The steam valve assembly has a mixing cavity and a steam discharge port communicating the mixing cavity with the outside, the steam valve assembly includes a steam discharge pipe communicating with the cooking cavity, the steam discharge end of the steam discharge pipe is located in the mixing cavity, and the steam discharge pipe has a contraction section with a contracted inner diameter, the contraction section is provided with a plurality of inlet ports along the circumferential direction thereof, and the cold air introduced from the cold air port is guided into the contraction section through the plurality of inlet ports, so that the steam introduced into the steam discharge pipe and the cold air introduced from the cold air port are mixed in the steam discharge pipe and then discharged into the mixing cavity through the steam discharge end.

2. The spill-proof cooking appliance with uniform bubble breaking according to claim 1, characterized in that The plurality of inlet ports are distributed in a fan shape along the circumferential direction of the contraction section.

3. The spill-proof cooking appliance with uniform bubble breaking according to claim 2, characterized in that The fan shape corresponds to a central angle α, and α satisfies: α≥180°.

4. The spill-proof cooking appliance with uniform bubble breaking according to claim 2, characterized in that The plurality of inlet ports are uniformly distributed along the circumferential direction of the contraction section, and the included angles between adjacent two inlet ports are equal.

5. The spill-proof cooking appliance with uniform bubble breaking according to claim 1, characterized in that The plurality of inlet ports are symmetrically distributed with one of the inlet ports as the symmetric axis.

6. The spill-proof cooking appliance with uniform bubble breaking according to claim 1, characterized in that The plurality of inlet ports are distributed in a spiral shape along the circumferential direction of the contraction section, so that adjacent two inlet ports have a spacing along the circumferential direction and the axial direction of the contraction section; or The plurality of inlet ports are staggered along the circumferential direction of the contraction section, so that adjacent two inlet ports have a staggered distance along the circumferential direction and the axial direction of the contraction section.

7. The spill-proof cooking appliance with uniform bubble breaking according to any one of claims 1 to 6, characterized in that The steam valve assembly further includes a plurality of inlet pipes, and the cold air from the cold air port, the inlet pipes and the inlet ports enters the contraction section.

8. The spill-proof cooking appliance with uniform bubble breaking according to claim 7, characterized in that The inlet pipes are provided with a sealing member abutting and sealing against the cold air port.

9. The spill-proof cooking appliance with uniform bubble breaking according to claim 8, characterized in that The inlet pipes and the sealing member are integrally formed.

10. The spill-proof cooking appliance with uniform bubble breaking according to claim 8, characterized in that The cold air port is provided with a plurality of inlet pipes, and the plurality of inlet pipes share one sealing member.

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