Spill-proof cooking utensil

Abstract

The anti-overflow cooking utensil comprises a pot body with a cooking cavity and a pot cover used for opening or covering the cooking cavity, the pot cover is provided with a steam valve assembly and a cold air inlet communicated with the outside, the steam valve assembly is provided with a mixing cavity, the mixing cavity is provided with a steam exhaust port communicated with the outside, and the steam valve assembly comprises a steam exhaust pipe communicated with the cooking cavity. The steam exhaust pipe is provided with a contraction section with the inner diameter contracted, cold air introduced from the cold air inlet is guided into the contraction section, and the steam outlet end of the steam exhaust pipe is located in the mixing cavity, so that steam introduced from the steam exhaust pipe and the cold air introduced from the cold air inlet are mixed in the steam exhaust pipe and then are exhausted into the mixing cavity through the steam outlet end, the pot cover comprises a lining cover and an inner cover, and a steam outlet is formed in the inner cover; and the steam exhaust pipe is butted with the steam outlet. External cold air can be introduced into the steam exhaust channel through the cold air inlet by means of low pressure formed when fluid flows through the contraction section, so that the condensation bubble breaking effect is achieved, and the probability that bubbles are continuously exhausted from the steam exhaust port is greatly reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of kitchen appliances, and specifically relates to an anti-overflow cooking utensil. Background Art

[0002] When cooking in a rice cooker, heat is generated in the cooking chamber as cooking progresses, and the resulting steam is discharged through the exhaust port of the steam valve located on the lid. When cooking rice porridge or other dishes, a large number of bubbles are generated during the cooking process. If the cooking power is too high or continuous cooking is used, the bubbles containing rice soup will overflow from the exhaust port, which will not only be a burden for the user to clean, but if the steam valve is not cleaned in time, the rice soup in the exhaust port will solidify, making cleaning more difficult and clogging the exhaust port, making it impossible to vent air. If low power is used to heat, reducing the heating power will result in longer cooking times, affecting the user experience.

[0003] The prior art discloses an electric rice cooker comprising a body and a lid. The lid covers the body to define a cooking chamber, the lid having a steam passage, and a negative pressure generator disposed on the lid. The negative pressure generator is configured to create a defoaming zone within at least one of the cooking chamber and the steam passage. The lid is also provided with a driver for rotating the negative pressure generator. This electric rice cooker utilizes the negative pressure generator to generate a localized negative pressure within at least one of the cooking chamber and the steam passage to promote foam collapse and reduce foam overflow. However, this electric rice cooker requires a complex negative pressure generator and driver, which is not only costly but also requires significant space, hindering miniaturization. Furthermore, the driver is located within the lid. To ensure the proper operation and service life of the driver, the lid requires a more complex sealing mechanism to protect the driver's operating environment from the effects of high-temperature steam. Furthermore, the driver's position must be optimized to prevent oil generated during operation from dripping into the cooking chamber.

[0004] The prior art also discloses a jet-type bubble breaker used in cooking utensils, comprising a shell and a steam inlet part, a steam outlet part and a cold air inlet channel connected to the shell. An intermediate storage chamber is provided in the shell, and the intermediate storage chamber is connected to the external space through the cold air inlet channel. The steam outlet of the steam inlet part and the steam inlet of the steam outlet part are both connected to the intermediate storage chamber. The cross-sectional size of the steam inlet channel of the steam inlet part gradually decreases along the steam flow direction to form a jet flow in the steam inlet channel. The steam inlet of the steam outlet channel in the steam outlet part is close to the steam outlet of the steam inlet channel so as to be able to receive at least part of the jet flow ejected from the steam inlet channel. A negative pressure gap is retained between the outlet part of the steam inlet part and the inlet part of the steam outlet part. The negative pressure gap is used to automatically introduce the cold air entering the intermediate storage chamber near the cold air inlet channel into the steam outlet channel by means of the relatively low pressure formed by the jet flow to assist in bubble breaking. Although the jet-type bubble breaker can achieve a certain degree of bubble breaking, its steam inlet and steam outlet are coaxially arranged, and the axial dimension of the steam outlet is relatively short, resulting in the high-speed jet rushing out of the steam inlet directly ejecting from the steam outlet before it has time to break the bubble, causing overflow. If the axial dimension of the steam outlet is lengthened to solve this problem, the internal pressure of the steam outlet will be greater than the pressure at the negative pressure gap due to the size of the steam outlet and the steam in the steam outlet, so that the cold air introduced from the cold air inlet channel will be more dissipated at the local low-pressure position at the steam outlet of the steam inlet and the intermediate storage chamber, thereby reducing its auxiliary bubble breaking performance and greatly reducing the overflow prevention effect. Summary of the Invention

[0005] The present application provides an anti-overflow cooking utensil to solve the technical problem that existing cooking utensils have poor anti-overflow effect, bubbles containing soup overflow from the exhaust port of the steam valve, causing the exhaust port to be blocked and making cleaning more difficult.

[0006] The technical solutions adopted in this application are:

[0007] The steam inlet is connected to the cooking chamber by a valve inlet pipe, and the steam inlet is connected to the cooking chamber by a valve inlet pipe.

[0008] The spill-proof cooking utensil in this application includes the following additional technical features:

[0009] The steam valve assembly also includes a cold air inlet pipe, the exhaust pipe has a steam inlet channel connected to the cooking chamber and an exhaust channel connected to the steam inlet channel and the mixing chamber, the cold air inlet pipe has a spoiler section extending into the exhaust channel, and the spoiler section has a spoiler portion facing the steam inlet end of the exhaust channel.

[0010] The flow-disturbing section further comprises a gas outlet notch facing the steam outlet end of the steam exhaust passage.

[0011] The distance between the bottom wall of the spoiler and the bottom wall of the exhaust channel is less than or equal to 1 / 2 of the inner diameter of the exhaust channel, so as to form the contraction section between the bottom wall of the spoiler and the bottom wall of the exhaust channel.

[0012] The exhaust pipe is provided with a communication port, and the communication port is communicated with the upstream side, the midstream side or the downstream side of the contraction section.

[0013] The exhaust pipe has a steam inlet channel connected to the cooking chamber and an exhaust channel connected to the steam inlet channel and the mixing chamber. The contraction section is provided in the exhaust channel. Along the flow direction of steam, the exhaust channel is further provided with a bundling section located on the upstream side of the contraction section. The inner diameter of the bundling section is larger than the inner diameter of the contraction section, and the inner diameter of the bundling section is smaller than the inner diameter of the steam inlet channel.

[0014] The exhaust pipe has a steam inlet channel connected to the cooking chamber and an exhaust channel connected to the steam inlet channel and the mixing chamber. The contraction section is provided in the exhaust channel. Along the flow direction of steam, the exhaust channel is also provided with an expansion section located on the downstream side of the contraction section. The inner diameter of the expansion section is larger than the inner diameter of the contraction section. The gas-liquid mixed fluid is sprayed into the mixing chamber through the expansion section.

[0015] The exhaust pipe includes a steam inlet channel communicating with the cooking cavity, an exhaust channel communicating with the steam inlet channel and the mixing cavity, and a bent portion communicating with the steam inlet channel and the exhaust channel.

[0016] The projection of the steam outlet end of the exhaust pipe in the horizontal direction and the projection of the exhaust port in the horizontal direction are staggered.

[0017] The steam valve assembly further includes a cold air inlet pipe, an air inlet end of the cold air inlet pipe extending to the outside of the mixing chamber, and a projection of the air inlet end of the cold air inlet pipe on a horizontal plane and a projection of the exhaust end of the exhaust port on a horizontal plane are staggered;

[0018] Alternatively, the pot cover is provided with an extension pipe connected to the cold air inlet and extending to the outside of the pot cover, and the projection of the air inlet end of the extension pipe on the horizontal plane is staggered with the projection of the exhaust end of the exhaust port on the horizontal plane.

[0019] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0020] 1. The exhaust pipe of the present application is provided with a contraction section with a narrowed inner diameter within its exhaust passage. This section accelerates the steam flow to the contraction section before it flows from the exhaust passage to the cooking chamber, thereby reducing the pressure at the contraction section. The change in pressure and flow rate causes a sudden change in the surface tension of the bubbles, resulting in bubble breakage or the reduction of large bubbles to smaller ones. The cold air introduced by the cold air inlet is directed into the contraction section. According to the Venturi principle, the external cold air is introduced into this low-pressure area, which further impacts the bubbles, not only achieving defoaming, but also cooling the bubbles, causing them to condense into liquid, further enhancing the defoaming effect. Even when cooking at high power, the exhaust port of the steam valve assembly will not produce continuous bubbles, significantly improving the anti-overflow effect of the cooking appliance.

[0021] In the present application, the steam outlet end of the exhaust channel is connected to the mixing chamber. When the fluid gushing out from the steam outlet end of the exhaust channel enters the mixing chamber from the exhaust channel, it will undergo a pressure release process. This pressure change helps to break the bubbles, thereby further eliminating the unbroken bubbles. After the foam breaks, it will be buffered in the mixing chamber under the action of its own weight to avoid clogging the exhaust port. Moreover, the pressure change between the steam outlet end of the exhaust channel and the mixing chamber causes the foam to break at the connection position between the two, which can reduce the resistance of the exhaust channel, so that fluids such as steam and foam can be discharged more smoothly, thereby improving the exhaust efficiency.

[0022] Furthermore, if the foam cannot be broken in time during the steam discharge process, the presence of the foam will cause local disturbances and resistance in the steam flow. These disturbances and resistances can easily lead to turbulence in the steam flow, thereby causing noise escalation. The present application can achieve bubble breaking through the cooperation of the contraction section and the cold air inlet pipe before the steam flows into the mixing chamber. After the foam bursts, these local disturbances and resistance are reduced, the steam flow becomes smoother, and the fluid interface becomes more continuous, thereby reducing the generation of turbulence and greatly reducing the exhaust noise.

[0023] In addition, the setting of the contraction section on the exhaust pipe in this application, and the setting of the steam outlet end of the exhaust pipe in the mixing chamber, allows the steam and the low-temperature gas to mix multiple times, that is, when the steam passes through the contraction section, the steam introduced by the exhaust pipe and the cold air introduced by the cold air inlet are mixed for the first time in the exhaust pipe, so that the temperature of the high-temperature steam can be reduced to a certain extent. After the first mixing, it will be discharged into the mixing chamber through the steam outlet end. Because the space of the mixing chamber is larger than that of the exhaust pipe, a second more sufficient mixing can be obtained, so that the temperature of the high-temperature steam can be further reduced, and then a part of the high-temperature steam can be liquefied to form condensed water, reducing the water vapor content in the steam, and ultimately reducing the discharge of high-temperature steam from the exhaust port. The existence of the mixing chamber also provides space for the collection of condensed water.

[0024] Since the exhaust pipe is installed on the detachable inner cover, it is convenient to remove the inner cover to clean the steam outlet and the exhaust pipe.

[0025] 2. As a preferred embodiment of the present application, the steam valve assembly further includes a cold air inlet pipe, which is connected to the exhaust pipe, so that the external cold air can directly reach the exhaust pipe through the cold air inlet pipe, thereby improving the utilization rate of the cold air, reducing the influence of the mixed gas in the mixing chamber on the cold air, and improving the mixing efficiency of the cold air and steam at the contraction section. The cold air inlet pipe has a flow-disturbing section extending into the exhaust passage, and the flow-disturbing section has a flow-disturbing portion facing the steam inlet end of the exhaust passage. The setting of the flow-disturbing section can generate disturbances to the fluid flowing from the steam inlet end of the steam inlet passage to the contraction section, thereby increasing the contact time and contact area between the cold air and the fluid in the contraction section, further improving the bubble breaking effect, and reducing the accumulation of foam in the exhaust passage, thereby facilitating the smooth discharge of steam and improving the exhaust efficiency.

[0026] Moreover, the turbulence section extends into the exhaust channel, which can further reduce the cross-sectional area of ​​the exhaust channel at this position, thereby changing the fluid velocity at this position in the exhaust channel, and then causing pressure changes. Combined with the setting of the contraction section, the pressure changes in the exhaust channel become diverse, greatly improving the bubble breaking efficiency.

[0027] Furthermore, the spoiler section also has an air outlet notch at the steam outlet end facing the exhaust channel. The setting of the air outlet notch can break the laminar state of the cold air, prompting the cold air to generate turbulence at this position, increasing the contact area and contact time between the cold air and the fluid, and further improving the bubble breaking effect.

[0028] 3. As a preferred embodiment of the present application, along the steam flow direction, the exhaust passage further comprises a clustering section located upstream of the contraction section, having an inner diameter larger than the contraction section and smaller than the steam inlet passage. The provision of the clustering section allows the fluid to undergo a gradual pressure reduction process before entering the contraction section, thereby avoiding pressure pulsation noise and vibration caused by sudden changes in fluid pressure. Furthermore, the inner diameter of the clustering section is larger than that of the contraction section, which helps reduce foam accumulation before entering the contraction section, further increasing the flow rate of the fluid as it flows through the contraction section, thereby contributing to the pressure drop at the contraction section, and further helping to improve the smoothness with which external cold air can enter the contraction section through the cold air inlet pipe, resulting in a better bubble breaking effect.

[0029] 4. As a preferred embodiment of the present application, the exhaust passage further comprises an expansion section, located downstream of the contraction section and having an inner diameter larger than that of the contraction section, along the steam flow direction. The design of the expansion section causes the fluid in the exhaust passage to undergo a further pressure release process as it flows from the contraction section to the expansion section. This pressure change facilitates bubble breaking. Furthermore, the larger inner diameter of the expansion section provides more space for the gas-liquid mixture, thereby facilitating the separation of steam and liquid and improving exhaust efficiency.

[0030] 5. As a preferred embodiment of the present application, the exhaust pipe comprises an inlet channel and an exhaust channel, with a bend disposed between the two channels. During cooking, steam from the cooking chamber enters the exhaust pipe through the inlet channel and then flows through the bend before entering the exhaust channel. The bend blocks and redirects the steam, breaking bubbles and reducing fluid dynamics, thereby facilitating liquefaction and condensation of the steam. In particular, when cooking foods such as rice soup, boiling water in the cooking chamber pushes some rice grains or small food particles upward into the inlet channel. The bend blocks and impacts these solid particles, causing them to fall back into the cooking chamber through the inlet of the inlet channel, thereby significantly reducing the probability of exhaust pipe blockage and ensuring smooth steam discharge.

[0031] 6. As a preferred embodiment of the present application, the axis of the steam outlet end of the exhaust channel is arranged at an angle to the axis of the exhaust port. This angle lengthens the flow path of the fluid from the steam outlet end of the exhaust channel to the exhaust port, thereby increasing the resistance loss along the fluid path, which both helps break bubbles and reduces noise. Furthermore, this angle ensures that the steam outlet end of the exhaust channel is at least partially offset from the exhaust port, preventing the fluid from being ejected directly from the exhaust port.

[0032] 7. As a preferred embodiment of the present application, the air inlet end of the cold air inlet pipe extends to the outside of the buffer, and the air inlet end of the cold air inlet pipe and the exhaust end of the exhaust port are staggered, thereby reducing the probability of introducing hot steam discharged from the exhaust port into the cold air inlet pipe, so that the temperature of the air introduced into the contraction section from the cold air inlet pipe is lower, thereby improving the bubble breaking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0034] Figure 1 This is a cross-sectional view of a partial structure of a cooking utensil according to one embodiment of the present application;

[0035] Figure 2 This is a cross-sectional view of the lower cover structure of an embodiment of the present application;

[0036] Figure 3 This is a cross-sectional view of a specific example of an exhaust pipe according to an embodiment of the present application;

[0037] Figure 4 This is a cross-sectional view of the lower exhaust pipe in Example 1 of the second embodiment of the present application;

[0038] Figure 5 This is a cross-sectional view of the lower exhaust pipe in Example 2 of the second embodiment of the present application;

[0039] Figure 6 This is a cross-sectional view of the lower exhaust pipe in Example 3 of the second embodiment of the present application;

[0040] Figure 7 This is a cross-sectional view of the exhaust pipe in the second embodiment of the present application under an example in Example 4;

[0041] Figure 8 This is a cross-sectional view of the exhaust pipe in another example of Example 4 according to the second embodiment of the present application;

[0042] Figure 9 This is a cross-sectional view of the lower exhaust pipe in Example 5 of the second embodiment of the present application;

[0043] Figure 10 This is a cross-sectional view of a specific example of the lower exhaust pipe of the third embodiment of the present application;

[0044] Figure 11 This is a cross-sectional view of the lower pot cover structure of another embodiment of the present application;

[0045] Figure 12 This is a cross-sectional view of the lower cover structure of another embodiment of the present application.

[0046] in:

[0047] 1. Lining cover;

[0048] 2. Inner cover;

[0049] 3. Seals;

[0050] 4. Mixing chamber; 41. Exhaust port;

[0051] 5. Exhaust pipe; 51. Steam inlet channel; 52. Exhaust channel; 53. Cluster section; 54. Contraction section; 55. Expansion section; 56. Casing; 57. Inlet gap; 58. Connecting port;

[0052] 6. Cold air inlet pipe; 61. Flow spoiler; 62. Air outlet notch;

[0053] 7. Reflux valve;

[0054] 8. Air conditioning inlet. DETAILED DESCRIPTION

[0055] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0056] The following description sets forth many specific details to facilitate a thorough understanding of the present application. However, the present application may also be implemented in other ways than those described herein, and therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the present application and the features of each embodiment may be combined with each other unless there is a conflict.

[0057] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present application.

[0058] In this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0059] In this application, unless otherwise expressly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0060] like Figure 1 and Figure 2 As shown, an anti-overflow cooking utensil includes a pot body having 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 inlet 8 connected to the outside, the steam valve assembly has a mixing cavity 4, the mixing cavity 4 is provided with a steam exhaust port 41 connected to the outside, the steam valve assembly includes a steam exhaust pipe 5 connected to the cooking cavity, the steam exhaust pipe has a contraction section 54 with a contracted inner diameter, the cold air introduced by the cold air inlet 8 is introduced into the contraction section 54, the steam outlet end of the steam exhaust pipe is located in the mixing cavity 4, so that the steam introduced by the steam exhaust pipe and the cold air introduced by the cold air inlet 8 are mixed in the steam exhaust pipe and then discharged into the mixing cavity 4 through the steam outlet end.

[0061] After high-temperature steam is generated in the cooking cavity, it flows within the exhaust pipe 5. The exhaust pipe 5 of the present application is provided with a constricted section 54 with a constricted inner diameter. Due to the provision of the constricted section 54, the steam is accelerated upon reaching the constricted section 54, resulting in a decrease in pressure at the constricted section 54. The changes in pressure and flow rate cause a sudden change in the surface tension of the bubbles, resulting in bubble breakage or the reduction of large bubbles to smaller ones. The cold air introduced by the cold air inlet 8 is directed into the constricted section 54. According to the Venturi principle, the external cold air is drawn into this low-pressure area, further impacting the bubbles. This not only eliminates the bubbles but also cools them, condensing them into liquid, further enhancing the defoaming effect. This ensures that, even when cooking at high power, continuous bubbles will not overflow from the exhaust port 41 of the steam valve assembly, significantly improving the overflow prevention of the cooking appliance. When the cold air is introduced into the contraction section 54, the steam introduced by the exhaust pipe 5 and the cold air introduced by the cold air inlet 8 are mixed for the first time in the exhaust pipe 5, so that the temperature of the high-temperature steam can be reduced to a certain extent. After the first mixing, it will be discharged into the mixing chamber 4 through the steam outlet end. Because the space of the mixing chamber 4 is larger than that of the exhaust pipe, a second more sufficient mixing can be obtained, so that the temperature of the high-temperature steam can be further reduced, and then a part of the high-temperature steam can be liquefied to form condensed water, which can ultimately reduce the discharge of high-temperature steam from the exhaust port 41.

[0062] Specifically, the introduction of cold air can be as follows: Figure 1 and Figure 2 As shown, a cold air introduction pipe 6 is provided, the air inlet end of the cold air introduction pipe 6 is connected to the cold air inlet 8 or the air inlet end extends to the outside, and the air outlet end is connected to the contraction section 54. Of course, it can also be, as Figure 11 As shown, instead of providing a separate cooling inlet pipe, a communication port 58 is provided at the contraction section 54, and the communication port 58 is connected to the cold air inlet 8 through the mixing chamber 4. Alternatively, the cold air inlet pipe has only a short section, and the air inlet end of the cold air inlet pipe is connected to the mixing chamber to achieve the transmission of cold air with the help of the mixing chamber, as shown in FIG. Figure 12 As shown, the small section of the cold air inlet pipe can be connected to the cold air inlet 8 and extend toward the connecting port 58 of the exhaust pipe, or the small section of the cold air inlet pipe can be arranged at the connecting port 58 of the exhaust pipe and extend toward the cold air inlet 8.

[0063] When a cold air inlet pipe 6 is provided to introduce cold air into the exhaust pipe 5, the connection method between the exhaust pipe 5 and the cold air inlet pipe 6 is not limited. In one embodiment, the exhaust pipe 5 and the cold air inlet pipe 6 are integrally formed, for example, using silicone to form the exhaust pipe 5 and the cold air inlet pipe 6 for ease of manufacturing and molding. In another embodiment, the exhaust pipe 5 and the cold air inlet pipe 6 are detachably connected and assembled together, for example, by means of a threaded connection.

[0064] In a preferred embodiment, the exhaust pipe includes a steam inlet channel 51 communicating with the cooking cavity and a steam exhaust channel 52 communicating with the steam inlet channel 51 and the mixing cavity 4. Figure 3 As shown, the cold air inlet pipe 6 is arranged perpendicular to the exhaust channel 52. When the steam in the cooking cavity is discharged through the exhaust channel 52, it has a certain flow speed and inertia. Since the cold air inlet pipe 6 is arranged perpendicular to the exhaust channel 52, the steam will hardly be discharged from the cold air inlet pipe 6. On the contrary, due to the flow of steam, the pressure at the contraction section 54 is reduced, so that the cold air inlet pipe 6 can introduce external cold air, thereby achieving the purpose of defoaming.

[0065] In a preferred embodiment, the exhaust pipe includes a steam inlet channel 51 and a steam exhaust channel 52. The steam inlet channel 51 and the steam exhaust channel 52 can be composed of two detachable exhaust pipes or a single integral exhaust pipe. When the exhaust pipe is formed as a single integral exhaust pipe, the front portion of the exhaust pipe corresponds to the steam inlet channel 51, and the rear portion of the exhaust pipe corresponds to the steam exhaust channel 52 along the steam flow direction.

[0066] Preferably, refer to Figure 3 A bend is formed between the steam inlet passage 51 and the steam exhaust passage 52. This arrangement blocks and redirects the steam generated in the cooking chamber upon entering the exhaust pipe 5, allowing the steam to liquefy and condense during this redirection. This is particularly true when cooking rice or porridge. The starch in the rice soup or small ingredients may enter the steam inlet passage 51 as the cooking chamber boils. The bend prevents these starches and small ingredients from falling back into the cooking chamber, reducing the chance of the exhaust pipe 5 becoming clogged.

[0067] In the present application, the steam outlet end of the exhaust channel 52 is connected to the mixing chamber 4. When the fluid gushing out from the steam outlet end of the exhaust channel 52 enters the mixing chamber 4 from the exhaust channel 52, it will undergo a pressure release process. This pressure change helps to break the bubbles, thereby further eliminating the unbroken bubbles. After the foam breaks, it will be buffered in the mixing chamber 4 under the action of its own weight to avoid clogging the exhaust port 41. Moreover, the rupture of the foam at the connection position between the steam outlet end of the exhaust channel 52 and the mixing chamber 4 caused by the pressure change between the two can reduce the resistance of the exhaust channel 52, so that fluids such as steam and foam can be discharged more smoothly, thereby improving the exhaust efficiency.

[0068] Furthermore, if the foam cannot be broken in time during the steam discharge process, the presence of the foam will cause local disturbances and resistance in the steam flow. These disturbances and resistances can easily lead to turbulence in the steam flow, thereby causing noise escalation. The present application can achieve bubble breaking through the cooperation of the contraction section 54 and the cold air inlet pipe 6 before the steam flows into the mixing chamber 4. After the foam bursts, these local disturbances and resistance are reduced, the steam flow becomes smoother, and the fluid interface becomes more continuous, thereby reducing the generation of turbulence and greatly reducing the exhaust noise.

[0069] As a preferred embodiment of the present application, Figure 2 As shown, the pot lid includes a lining cover 1 and an inner cover 2 removably mounted to the lining cover 1. The steam valve assembly includes a steam valve cover mounted to the lining cover 1. The steam valve cover can also be integrally formed with the lining cover. The lining cover 1 and / or the steam valve cover are provided with a seal 3 having a lower sealing lip that abuts and seals against the upper surface of the inner cover 2. The steam valve cover, seal 3, and inner cover 2 cooperate to form a mixing chamber 4. A steam exhaust pipe 5 is mounted to the inner cover 2 so that it can be removed from the lining cover 1 along with the inner cover 2, allowing the user to thoroughly clean the inner cover 2 and the steam exhaust pipe 5. After the inner cover 2 is removed, the mixing chamber 4 is directly exposed to the user's field of vision, allowing for thorough cleaning of the inner walls of the mixing chamber 4 and preventing the accumulation of dirt and bacteria within the steam valve assembly. Furthermore, the steam exhaust pipe 5 is removably mounted to the inner cover 2 so that it can be removed and cleaned. Specifically, the inner cover 2 is provided with a steam outlet, and the steam exhaust pipe 5 is mounted adjacent to the outlet. The exhaust pipe 5 has a mounting portion at its lower portion, which interfaces with the steam outlet. In a preferred embodiment, the exhaust pipe 5 is a silicone tube with a slot provided below. The inner cover 2 is a metal inner cover, which interfaces with the steam outlet through deformation of the slot. In other embodiments, the exhaust pipe 5 can also be interfaced with the steam outlet through threads or snap fasteners.

[0070] Preferably, if Figure 2 As shown, the inner lid 2 is provided with a reflux hole and a reflux valve 7 that floats on the inner lid 2 to open or close the reflux hole. When the pressure in the cooking chamber rises to a certain threshold, the reflux valve 7 is pushed upward to close the reflux hole, preventing steam from flowing back into the mixing chamber 4. When the pressure in the cooking chamber drops to a certain threshold, the reflux valve 7 descends under the influence of its own gravity and the gravity of the liquid in the mixing chamber 4, opening the reflux hole. The liquid accumulated in the mixing chamber 4 then falls back into the cooking chamber through the reflux hole. Furthermore, a portion of the inner lid 2 is sunken to form a liquid collection trough connected to the mixing chamber 4, allowing the mixing chamber 4 to collect condensed water and liquid that has fallen back after bubbles have broken. The reflux hole is provided on the bottom wall of the reflux trough to facilitate liquid backflow.

[0071] When a cold air inlet pipe is provided to guide the cold air, and the cold air inlet pipe is connected to the exhaust pipe 5 (that is, the cold air inlet pipe can be a small section connected to the exhaust pipe 5, and its air inlet end is connected to the mixing chamber 4, and the cold air transmission is achieved through the mixing chamber 4. The cold air inlet pipe can also be connected to the exhaust pipe at one end and connected to the cold air inlet 8 at the other end, or extend to the outside through the cold air inlet 8), the exhaust pipe is provided with a connecting port 58. The present application does not limit the connection position and connection method of the cold air inlet pipe in the contraction section 54, and it can adopt any one of the following embodiments:

[0072] Implementation method 1: Figure 3 As shown, the outlet end of the cold air inlet pipe 6 is connected to the connecting port 58, which is connected to the midstream side of the contraction section 54. This arrangement allows the cold air inlet pipe 6 to be connected to the lowest pressure position of the exhaust passage 52, facilitating the introduction of external cold air and improving the bubble breaking effect.

[0073] Embodiment 2: The outlet end of the cold air inlet pipe 6 passes through the connecting port 58 to enter the interior of the exhaust passage 52. The cold air inlet pipe 6 has a flow disturbance section extending into the exhaust passage 52, and the flow disturbance section has a flow disturbance portion 61 facing the steam inlet end of the exhaust passage 52. The setting of the flow disturbance section can generate disturbances to the fluid flowing from the steam inlet end of the steam inlet passage 51 to the contraction section 54, thereby increasing the contact time and contact area between the cold air and the fluid in the contraction section 54, further improving the bubble breaking effect, reducing the accumulation of foam in the exhaust passage 52, thereby facilitating the smooth discharge of steam and improving the exhaust efficiency. Moreover, the flow disturbance section extends into the exhaust passage 52, which can further reduce the cross-sectional area of ​​the exhaust passage 52 at this position, thereby causing the fluid velocity at this position in the exhaust passage 52 to change, thereby causing pressure changes. Combined with the setting of the contraction section 54, the pressure changes in the exhaust passage 52 are diversified, greatly improving the bubble breaking efficiency.

[0074] As a preferred embodiment of the second embodiment, Figures 4 to 8 As shown, the flow-disturbing section further has an air outlet notch 62 facing the steam outlet end of the exhaust passage 52. The provision of the air outlet notch 62 can disrupt the laminar flow of the cold air, causing the cold air to generate turbulent flow at this location, increasing the contact area and contact time between the cold air and the fluid, and further improving the bubble breaking effect.

[0075] In the second embodiment, the connection position between the cold air inlet pipe 6 and the contraction section 54 can adopt any one of the following embodiments:

[0076] Example 1: Figure 4As shown, along the flow direction of steam, the communication port 58 is connected to the upstream side of the contraction section 54, so that the outlet end of the cold air introduction pipe 6 is connected to the upstream side of the contraction section 54. By introducing cold air on the upstream side of the contraction section 54, the cold air can partially fill the contraction section 54, thereby reducing the flow rate and pressure drop of the steam to a certain extent, thereby reducing the pressure loss of the steam when passing through the contraction section 54, thereby ensuring the flow rate of the steam when it is discharged through the exhaust channel 52 and ensuring the exhaust efficiency.

[0077] Example 2: Figure 5 As shown, along the steam flow direction, the communication port 58 is connected to the downstream side of the contraction section 54, so that the outlet end of the cold air introduction pipe 6 is connected to the downstream side of the contraction section 54. By introducing cold air downstream of the contraction section 54, the steam temperature can be lowered, reducing the thermal shock of the steam on the mixing chamber 4 when it is discharged from the steam exhaust channel 52. This helps the steam condense into water in the mixing chamber 4, reduces the amount of steam discharged, and protects the storage environment of the cooking utensils.

[0078] Example 3: Figure 6 As shown, along the steam flow direction, the communication port 58 is connected to the midstream side of the contraction section 54, so that the outlet end of the cold air introduction pipe 6 is connected to the midstream side of the contraction section 54. The flow velocity of the fluid on the midstream side of the contraction section 54 is relatively high. By introducing cold air, the flow velocity can be reduced to a certain extent, thereby achieving noise reduction.

[0079] The formation method of the contraction section 54 in the second embodiment can adopt any one of the following embodiments:

[0080] Example 4: Figure 7 As shown, the distance between the bottom wall of the spoiler 61 and the bottom wall of the exhaust passage 52 is less than or equal to 1 / 2 of the inner diameter of the exhaust passage 52, so as to form a contraction section 54 between the bottom wall of the spoiler 61 and the bottom wall of the exhaust passage 52. Furthermore, in a preferred example, as Figure 8 As shown, along the flow direction of steam, the exhaust channel 52 also has a cluster section 53 located on the upstream side of the contraction section 54. The inner diameter of the cluster section 53 gradually decreases from the side away from the contraction section 54 to the side close to the contraction section 54, so as to further optimize the flow rate of the fluid at the contraction section 54, so as to form a relatively low pressure and facilitate the introduction of external cold air.

[0081] Example 5: Figure 9 As shown, a sleeve 56 is provided in the exhaust passage 52 . The sleeve 56 has a contraction section 54 with a contracted inner diameter. The outlet end of the cold air inlet pipe 6 is connected to the contraction section 54 .

[0082] Implementation method three: Figure 10As shown, a sleeve 56 is provided in the exhaust channel 52, and the sleeve 56 has a contraction section 54 with a contracted inner diameter. The outer wall of the sleeve 56 cooperates with part of the inner cavity wall of the exhaust channel 52 to form an air inlet gap 57 connected to the air outlet end of the cold air inlet pipe 6. The air outlet end of the cold air inlet pipe 6 is adjacent to the steam outlet of the sleeve 56.

[0083] As a preferred embodiment of the present application, along the flow direction of steam, the exhaust channel 52 also has a cluster section 53 located on the upstream side of the contraction section 54. The inner diameter of the cluster section 53 is larger than the inner diameter of the contraction section 54, and the inner diameter of the cluster section 53 is smaller than the inner diameter of the steam inlet channel 51. The setting of the cluster section 53 allows the fluid to undergo a process of gradually decreasing pressure before entering the contraction section 54, thereby avoiding pressure pulsation noise and vibration caused by sudden changes in fluid pressure. Moreover, the inner diameter of the cluster section 53 is larger than the inner diameter of the contraction section 54, which helps to reduce the accumulation of foam before entering the contraction section 54, further increasing the flow rate of the fluid when flowing through the contraction section 54, thereby helping to reduce the pressure drop at the contraction section 54, and further helping to improve the smoothness with which the external cold air can enter the contraction section 54 through the cold air inlet pipe 6, so that the bubble breaking effect is better.

[0084] This embodiment does not limit the way in which the inner diameter of the cluster section 53 changes: in one embodiment, Figure 3 、 Figure 5 、 Figure 6 、 Figure 8 、 Figure 9 and Figure 10 As shown, the inner diameter of the clustering section 53 gradually decreases from the side away from the contraction section 54 to the side close to the contraction section 54, thereby achieving a gradual change in the inner diameter of the clustering section 53. In another embodiment, the inner diameter of the clustering section 53 changes in a step-like manner, with the inner diameter being smallest on the side close to the contraction section 54 and largest on the side away from the contraction section 54.

[0085] As a preferred embodiment of the present application, the exhaust passage 52 further includes an expansion section 55 located downstream of the contraction section 54 along the steam flow direction. The inner diameter of the expansion section 55 is larger than that of the contraction section 54, and the gas-liquid mixed fluid is sprayed into the mixing chamber 4 through the expansion section 55. The design of the expansion section 55 causes the fluid in the exhaust passage 52 to undergo another pressure release process when flowing from the contraction section 54 to the expansion section 55. The pressure change helps to achieve bubble breaking. Moreover, the larger inner diameter of the expansion section 55 provides more space for the gas-liquid mixed fluid, thereby facilitating the separation of steam and liquid and improving exhaust efficiency.

[0086] This embodiment does not limit the way in which the inner diameter of the expansion section 55 changes: in one embodiment, Figures 3 to 6As shown, the inner diameter of the expansion section 55 gradually decreases from the side away from the contraction section 54 to the side close to the contraction section 54, thereby achieving a gradual change in the inner diameter of the expansion section 55. In another embodiment, the inner diameter of the expansion section 55 changes in a step-like manner, with the inner diameter being smallest on the side close to the contraction section 54 and largest on the side away from the contraction section 54.

[0087] As a preferred embodiment of the present application, the axis of the steam outlet end of the exhaust pipe 5 is arranged at an angle to the axis of the exhaust port 41. This angle lengthens the flow path of the fluid from the steam outlet end of the exhaust pipe 5 to the exhaust port 41, thereby increasing the resistance loss along the fluid path, which both helps break bubbles and reduces noise. Furthermore, this angle ensures that the steam outlet end of the exhaust pipe 5 is at least partially offset from the exhaust port 41, preventing the fluid from being ejected directly from the exhaust port 41.

[0088] As a preferred example of this embodiment, Figure 1 and Figure 2 As shown, the horizontal projection of the steam outlet end of the exhaust pipe 5 and the horizontal projection of the steam outlet 41 are staggered. This arrangement can extend the flow path of the fluid and achieve speed reduction and noise reduction. Furthermore, the axis of the steam outlet end of the exhaust pipe 5 and the axis of the steam outlet 41 are perpendicular to each other, so that when the fluid flows out through the steam outlet end of the exhaust pipe 5 and flows toward the steam outlet 41, it will go through at least one corner. The corner can force the fluid to change the flow direction and increase the disturbance in the fluid, thereby helping to destroy the stability of the foam and promote the rupture of the foam. Moreover, at the corner, due to the action of centrifugal force, the steam and liquid are more easily separated, thereby promoting gas-liquid separation and improving the exhaust efficiency.

[0089] As a preferred embodiment of the present application, Figure 2 As shown, the steam valve assembly includes a cold air inlet pipe 6, and the exhaust port 41 of the mixing chamber 4 and the air outlet end of the exhaust pipe 5 are separated on two opposite sides of the cold air inlet pipe 6. On the one hand, the flow path of the fluid from the exhaust pipe 5 to the exhaust port 41 can be further extended to further achieve bubble breaking. On the other hand, the steam will bypass the cold air inlet pipe 6 during the discharge path, thereby achieving heat exchange and reducing the steam discharge temperature.

[0090] As a preferred embodiment of the present application, Figure 1 and Figure 2 As shown, the steam valve assembly includes a cold air inlet pipe 6, the air inlet end of the cold air inlet pipe 6 extends to the outside of the mixing chamber 4, and the air inlet end of the cold air inlet pipe 6 is staggered with the exhaust end of the exhaust port 41. This arrangement can reduce the probability of hot steam discharged from the exhaust port 41 being introduced into the cold air inlet pipe 6, so that the temperature of the air introduced into the contraction section 54 from the cold air inlet pipe 6 is lower, thereby improving the bubble breaking effect. Furthermore, as Figure 2As shown, the top surface of the cold air introduction pipe 6 is higher than the top surface of the steam exhaust port 41 to further reduce the probability of the cold air introduction pipe 6 sucking in the discharged hot steam. In another embodiment, the air inlet end of the cold air introduction pipe 6 is flush with the outer wall surface of the top wall of the mixing chamber 4.

[0091] As another embodiment of the present application, the steam valve assembly is not provided with a cold air inlet pipe. In this embodiment, the pot cover is provided with an extension pipe connected to the cold air inlet 8 and extending to the outside of the pot cover. The projection of the air inlet end of the extension pipe on the horizontal plane and the projection of the exhaust end of the exhaust port 41 on the horizontal plane are staggered to reduce the probability of hot steam discharged from the exhaust port 41 being introduced into the extension pipe.

[0092] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0093] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0094] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A spill-proof cooking utensil comprising a pot body having a cooking cavity and a pot lid for opening or closing the cooking cavity, characterized in that: The pot cover is provided with a steam valve assembly and a cold air inlet connected to the outside world, the steam valve assembly has a mixing chamber, the mixing chamber is provided with a steam exhaust port connected to the outside world, the steam valve assembly includes a steam exhaust pipe connected to the cooking chamber, the steam exhaust pipe has a contraction section with a contracted inner diameter, the cold air introduced by the cold air inlet is introduced into the contraction section, the steam outlet end of the steam exhaust pipe is located in the mixing chamber, so that the steam introduced by the steam exhaust pipe and the cold air introduced by the cold air inlet are mixed in the steam exhaust pipe and then discharged into the mixing chamber through the steam outlet end, the pot cover includes a lining cover and an inner cover detachably mounted on the lining cover, the inner cover is provided with a steam outlet, and the steam exhaust pipe is mounted in connection with the steam outlet.

2. The anti-spill cooking utensil according to claim 1, characterized in that: The steam valve assembly also includes a cold air inlet pipe, the exhaust pipe has a steam inlet channel connected to the cooking chamber and an exhaust channel connected to the steam inlet channel and the mixing chamber, the cold air inlet pipe has a spoiler section extending into the exhaust channel, and the spoiler section has a spoiler portion facing the steam inlet end of the exhaust channel.

3. The anti-spill cooking utensil according to claim 2, characterized in that: The flow-disturbing section further comprises a gas outlet notch facing the steam outlet end of the steam exhaust passage.

4. The anti-spill cooking utensil according to claim 2, characterized in that: The distance between the bottom wall of the spoiler and the bottom wall of the exhaust channel is less than or equal to 1 / 2 of the inner diameter of the exhaust channel, so as to form the contraction section between the bottom wall of the spoiler and the bottom wall of the exhaust channel.

5. The anti-spill cooking utensil according to claim 1, characterized in that: The exhaust pipe is provided with a communication port, and the communication port is communicated with the upstream side, the midstream side or the downstream side of the contraction section.

6. The anti-spill cooking utensil according to claim 1, characterized in that: The exhaust pipe has a steam inlet channel connected to the cooking chamber and an exhaust channel connected to the steam inlet channel and the mixing chamber. The contraction section is provided in the exhaust channel. Along the flow direction of steam, the exhaust channel is further provided with a bundling section located on the upstream side of the contraction section. The inner diameter of the bundling section is larger than the inner diameter of the contraction section, and the inner diameter of the bundling section is smaller than the inner diameter of the steam inlet channel.

7. The spill-proof cooking utensil according to any one of claims 1 to 6, characterized in that: The exhaust pipe has a steam inlet channel connected to the cooking chamber and an exhaust channel connected to the steam inlet channel and the mixing chamber. The contraction section is provided in the exhaust channel. Along the flow direction of steam, the exhaust channel is also provided with an expansion section located on the downstream side of the contraction section. The inner diameter of the expansion section is larger than the inner diameter of the contraction section. The gas-liquid mixed fluid is sprayed into the mixing chamber through the expansion section.

8. The anti-spill cooking utensil according to any one of claims 1 to 6, characterized in that: The exhaust pipe includes a steam inlet channel communicating with the cooking cavity, an exhaust channel communicating with the steam inlet channel and the mixing cavity, and a bent portion communicating with the steam inlet channel and the exhaust channel.

9. The anti-spill cooking utensil according to any one of claims 1 to 6, characterized in that: The projection of the steam outlet end of the exhaust pipe in the horizontal direction and the projection of the exhaust port in the horizontal direction are staggered.

10. The anti-spill cooking utensil according to any one of claims 1 to 6, characterized in that: The steam valve assembly further includes a cold air inlet pipe, an air inlet end of the cold air inlet pipe extending to the outside of the mixing chamber, and a projection of the air inlet end of the cold air inlet pipe on a horizontal plane and a projection of the exhaust end of the exhaust port on a horizontal plane are staggered; Alternatively, the pot cover is provided with an extension pipe connected to the cold air inlet and extending to the outside of the pot cover, and the projection of the air inlet end of the extension pipe on the horizontal plane is staggered with the projection of the exhaust end of the exhaust port on the horizontal plane.

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