Optimized anti-overflow cooking utensil

Abstract

The optimized 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, the steam valve assembly comprises a valve deck, a valve seat and a steam exhaust pipe, the valve deck is provided with a steam exhaust port communicated with the outside, and the valve deck and the valve seat are matched to define a mixing cavity; the valve seat is provided with a backflow area capable of being communicated with the mixing cavity and the cooking cavity, the steam exhaust pipe comprises a steam inlet section and a steam outlet section bent relative to the steam inlet section, the steam outlet end of the steam outlet section is located above the backflow area, the backflow area is provided with a plurality of backflow holes, and the section of at least part of the backflow holes is non-circular. Due to the design of the backflow hole, the curvature of the liquid level at the backflow hole is reduced, the additional pressure generated by the curvature is also reduced, and the reduction of the effective circulation area of the backflow hole is reduced, so that the backflow flow and the backflow speed at the backflow area are ensured, and slurry and condensate water after bubble breaking can smoothly flow back through the backflow area.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of kitchen appliances, and particularly relates to a cooking appliance with optimized anti-overflow function. BACKGROUND

[0002] When the electric rice cooker is in operation, heat is generated in the cooking cavity, and the generated steam is discharged through the steam exhaust port of the steam valve arranged on the pot cover. When cooking operations such as porridge are performed, a large amount of bubbles will be generated during the cooking process. If the cooking fire is too large or continuous heating is used, the bubbles wrapped in the rice soup will overflow from the exhaust port, which not only brings cleaning burden to the user, but also causes the cleaning difficulty to be upgraded and the exhaust port to be blocked, resulting in the problem of no exhaust. If small fire is used to reduce the heating power, the cooking time will be longer, which will affect the user experience.

[0003] During the cooking process, there are two main factors affecting the overflow of the steam valve in the design: one is whether the bubbles wrapped in the steam discharge process are effectively broken, and the other is whether the condensed water in the steam valve is effectively returned to avoid excessive accumulation affecting the flow of steam or overflowing from the exhaust port. The prior art discloses a cooking appliance, wherein the steam valve comprises a valve cover, a valve seat, and a valve cavity surrounded by the valve cover and the valve seat, a gas guide cylinder is arranged on the valve seat and extends in the vertical direction so that the gas outlet end of the gas guide cylinder is close to the valve cover, a steam exhaust port is arranged on the valve cover and is arranged in the horizontal direction with the gas outlet end of the gas guide cylinder, a return hole is arranged on the valve seat to return the condensed water and the broken bubble liquid in the valve cavity to the cooking cavity of the cooking appliance, and the return hole is also arranged in the horizontal direction with the gas outlet end of the gas guide cylinder. The defects of this technical solution are as follows: due to the vertical design of the gas guide cylinder and the staggered arrangement of the return hole, a considerable part of the condensed water and the broken bubble liquid generated during the steam flow will flow back through the gas guide cylinder. The backflow liquid will collide with the outward flowing steam, affecting the smoothness of steam discharge and flow, not only affecting the anti-overflow effect, but also producing a large amount of steam exhaust noise, affecting the user experience. UTILITY MODEL CONTENTS

[0004] The present application provides a cooking appliance with optimized anti-overflow function to solve the technical problem of reduced anti-overflow effect caused by poor backflow of broken bubble liquid and condensed water in the steam valve of the cooking appliance.

[0005] The technical solution adopted by the present application is as follows:

[0006] The application discloses an optimized anti-overflow cooking utensil, which comprises a pot body with a cooking cavity and a pot cover for opening or covering the cooking cavity, wherein a steam valve assembly is arranged on the pot cover, the steam valve assembly comprises a valve cover, a valve seat and a steam discharge pipe, the valve cover is provided with a steam discharge port communicating with the outside, the valve cover and the valve seat cooperatively form a mixing cavity, the valve seat is provided with a backflow area capable of communicating the mixing cavity and the cooking cavity, the steam discharge pipe comprises a steam inlet section and a steam outlet section bent relative to the steam inlet section, the steam outlet end of the steam outlet section is located above the backflow area, and the backflow area is provided with a plurality of backflow holes, at least part of the backflow holes are non-circular in cross-sectional shape.

[0007] In the application, the steam outlet section of the steam discharge pipe is bent relative to the steam inlet section. During cooking, the steam in the cooking cavity flows through the bent part of the steam discharge pipe before entering the steam outlet section from the steam inlet section. The bent part plays a role in blocking and changing the direction of the steam, and in the process of changing the direction, the steam bubbles are broken and the kinetic energy of the fluid is lost, which helps to realize the liquefaction and condensation of the steam. Especially during the cooking of rice soup and other foods, when the cooking cavity is boiling, part of the rice or small particle food materials will be pushed up into the steam inlet section. Due to the existence of the bent part, the solid particles are blocked and impacted, so that the solid particles fall back into the cooking cavity through the steam inlet port of the steam inlet section, thereby greatly reducing the probability of the steam discharge pipe being blocked, ensuring that the steam can smoothly pass through the steam discharge pipe into the mixing cavity and finally be discharged from the steam discharge port.

[0008] Moreover, the steam outlet section is bent relative to the steam inlet section, so that the steam outlet end of the steam outlet section can be located above the backflow area. When the steam is discharged from the steam outlet section into the mixing cavity, it will not only experience a change in flow area and a change in pressure, but also experience a change in flow velocity and a change in temperature. The collective effect of various changes on the steam and the steam bubbles wrapped therein will cause a sudden change in the surface tension of the steam bubbles, realizing the breaking of the bubbles or the change of large bubbles into small bubbles, which not only helps to improve the anti-overflow effect, but also helps to return the slurry in the process of breaking the bubbles. Since the steam outlet end of the steam outlet section is located above the backflow area, both the condensed water and the slurry after the bubbles are broken can easily fall into the backflow area to wait for backflow, thereby improving the backflow efficiency and reducing the accumulation of a large amount of liquid in the mixing cavity.

[0009] The backflow zone is provided with a plurality of backflow holes, and the liquid has surface tension, when the liquid passes through the backflow hole, a thin film will be formed on the hole wall, due to the effect of surface tension, the thin film will shrink inward to form a concave liquid surface in the hole, the curvature of the liquid surface will generate an additional pressure pointing to the hole, so that the effective size of the hole is reduced, especially when the cross-sectional shape of the backflow hole is circular, due to the characteristics of its geometry, the surface tension is uniformly distributed in the circumferential direction of the hole, so that the curvature of the liquid surface of the circular backflow hole is larger, the additional pressure generated by the surface tension is also larger, thereby causing the effective size of the backflow hole to be seriously reduced, and the surface tension of the liquid will form a certain resistance at the inlet and outlet of the circular backflow hole, at the inlet, the surface tension will hinder the entry of the liquid, so that the liquid needs to overcome a larger pressure to pass through the backflow hole, at the outlet, the surface tension will make it difficult for the liquid to flow out smoothly, forming a certain back pressure, the existence of such resistance is equivalent to reducing the effective flow area of the backflow hole, reducing the flow and flow rate of the backflow hole. Therefore, at least part of the cross-sectional shape of the backflow hole in the present application is non-circular, for the backflow hole with a non-circular cross-sectional shape, when the liquid flows through such backflow hole, the surface tension is non-uniformly distributed in the circumferential direction of the backflow hole, thereby reducing the curvature of the liquid surface at the backflow hole, also reducing the additional pressure generated thereby, reducing the reduction of the effective flow area of the backflow hole, thereby ensuring the backflow flow and backflow velocity at the backflow zone, so that the pulp and condensed water after breaking the bubbles can smoothly backflow through the backflow zone.

[0010] The steam outlet section extends in the transverse direction, and the outer periphery of the steam outlet section is of a variable-diameter structure to form at least one drip guide on the outer periphery of the steam outlet section, the drip guide being located above the backflow zone.

[0011] In the technical solution, the transverse extension arrangement of the steam outlet section and the drip guide formed by the variable-diameter structure can change the flow path of the condensed water adhering to the outer surface of the steam outlet section, so that the condensed water is gathered and dripped at the drip guide, and the drip guide is located above the backflow zone, so that the condensed water gathered at the drip guide can fall into the backflow zone when dripping, facilitating the collection of the liquid by the backflow zone and improving the backflow efficiency.

[0012] The backflow zone is provided with a backflow valve movable along the valve seat to open or close the backflow hole.

[0013] The technical solution sets a reflux valve in the reflux area, which can open and close the reflux hole, so that the reflux hole is closed at the appropriate time to avoid steam overflowing from the reflux hole, ensuring that the steam flows along the preset flow path. In a preferred embodiment, the movement of the reflux valve is a non-powered movement, i.e. when the pressure in the cooking cavity of the cooking utensil reaches a certain threshold and a certain amount of condensed water accumulates in the reflux area, the reflux valve opens the reflux hole under the action of pressure difference, condensed water gravity and the gravity of the reflux valve itself, so that the condensed water falls smoothly, avoiding the presence of condensed water in the mixing chamber, avoiding the need to set a separate power mechanism to drive the movement of the reflux valve, simplifying the structure design and reducing the cost.

[0014] The cross-sectional area of at least part of the reflux hole is different.

[0015] The mixing chamber not only has condensed water formed by steam cooling, but also has solid particulate matter such as rice grains and the like that is precipitated after the steam bubbles entraining food materials are broken. The technical solution sets the cross-sectional area of at least part of the reflux hole to be different, which can prevent all reflux holes from being blocked by the same type of food residue and affect the reflux effect, ensuring smooth reflux of liquid in the reflux area.

[0016] Part of the valve seat is recessed in a direction away from the mixing chamber to form a liquid collection groove, and the reflux area is located on one side of the liquid collection groove.

[0017] The technical solution sets a liquid collection groove, which can uniformly collect liquid in the mixing chamber and concentrate it in the liquid collection groove. The reflux area is located on one side of the liquid collection groove, which can optimize the layout of the steam exhaust pipe, liquid collection groove and reflux area in a limited steam valve structure space, achieving a better liquid collection effect. In addition, the recessed liquid collection groove can increase the structural strength of the valve seat, making the valve seat more stable when subjected to steam pressure and condensed water impact, and improving the anti-deformation ability of the valve seat.

[0018] The projection of the steam exhaust port in the horizontal direction and the projection of the steam inlet section in the horizontal direction both fall into the liquid collection groove, and the projection of the steam exhaust port in the horizontal direction and the reflux area are located on opposite sides of the steam inlet section axis.

[0019] In the technical solution, the relative position relationship between the steam exhaust port, the steam inlet section and the liquid collecting groove is limited, so that the liquid collecting groove can directly receive the liquid falling back from the steam exhaust port and the liquid falling back from the outer surface of the steam inlet section, which helps to improve the liquid collecting efficiency of the liquid collecting groove.

[0020] The steam exhaust pipe has a transition section connecting the steam inlet section and the steam outlet section, the steam inlet section extends vertically, and the transition section extends in an arc shape to form a flow guide surface on the outer periphery of the transition section and the steam inlet section.

[0021] In the technical solution, the arc-shaped extension of the transition section and the vertical extension of the steam inlet section enable the condensed water attached to the outer periphery of the steam inlet section and the transition section to smoothly flow back through the flow guide surface, further improving the liquid collecting efficiency of the liquid collecting groove for liquid.

[0022] The steam outlet section has a first contraction section with a contracted inner diameter, the first contraction section is provided with an inlet, the valve cover is provided with a cold air port, the steam outlet end and the steam exhaust port are located on two opposite sides of the cold air port, and the cold air introduced through the cold air port is guided into the first contraction section through the inlet.

[0023] In the technical solution, the first contraction section with a contracted inner diameter is arranged in the steam outlet section, so that the steam is accelerated when flowing to the first contraction section due to the arrangement of the first contraction section before flowing through the steam exhaust pipe to the mixing chamber, thereby reducing the pressure at the first contraction section. The change of pressure and flow rate will cause a sudden change of the surface tension of the steam bubbles, achieving bubble breaking or large bubbles becoming small bubbles. According to the Venturi principle, the cold air introduced through the cold air inlet will be introduced into the low-pressure area, and the introduction of the cold air will further impact the steam bubbles. Not only can the bubbles be broken, but also the steam bubbles can be cooled to condense into liquid, further improving the bubble breaking effect. Even if high power cooking is used during cooking, the steam exhaust port of the steam valve assembly will not have continuous bubbles overflowing, greatly improving the anti-overflow effect of the cooking utensil. The steam outlet end and the steam exhaust port are located on two opposite sides of the cold air port, so that the steam discharged from the steam outlet end will pass through the cold air port before reaching the steam exhaust port, thereby further reducing the temperature of the steam and facilitating the formation of condensed water, and further facilitating the liquid collection of the backflow area.

[0024] The steam valve assembly further comprises an introduction pipe which is in communication with the cold air outlet and the introduction inlet, the valve cover is provided with a blocking rib which extends towards the mixing cavity, the blocking rib is located between the steam outlet and the introduction pipe, and there is a steam passing gap between the blocking rib and the steam outlet pipe.

[0025] The arrangement of the introduction pipe in the technical solution can form a guiding path for the cold air from the cold air outlet to the introduction inlet, so that as much cold air as possible can enter the first contraction section, thereby assisting steam condensation and bubble breaking. In the technical solution, the arrangement of the blocking rib and the existence of the steam passing gap can further prolong the flow path of the steam, and the steam can experience various flow cross-sectional areas during the process of entering the steam outlet pipe, being discharged from the steam outlet pipe into the mixing cavity, flowing through the steam passing gap, and being discharged from the steam outlet, so that the steam flow velocity changes in multiple ways, which greatly improves the bubble breaking efficiency and the formation efficiency of condensed water, thereby improving the anti-overflow effect.

[0026] The introduction pipe is provided with a second contraction section, and steam which is introduced into the steam outlet pipe at least partially flows from the steam outlet end to the mixing cavity and then flows around the introduction pipe before being discharged from the steam outlet.

[0027] In the technical solution, the introduction pipe is provided with a second contraction section to form a low pressure area at the introduction pipe, which not only can more efficiently introduce the cold air into the first contraction section and improve the cold air introduction efficiency, but also according to Bernoulli's principle, the flow speed of the cold air increases after passing through the second contraction section, so that the cold air can obtain greater injection momentum when entering the first contraction section, thereby helping the cold air to more effectively mix with the high-temperature steam in the steam outlet pipe and improving the bubble breaking efficiency and the anti-overflow effect. In the technical solution, at least part of the steam flows around the introduction pipe during the process of flowing from the steam outlet end of the steam outlet pipe to the steam outlet, and since the introduction pipe introduces cold air, the temperature of the introduction pipe is lower than the temperature in the mixing cavity. When the steam flows around the introduction pipe, not only bubble breaking can be achieved, but also cooling of the steam can be achieved, which not only reduces the steam temperature, but also helps the formation of condensed water, thereby improving the anti-overflow effect. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings described herein are used to provide further understanding of the present application, and form 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:

[0029] Figure 1 It is a sectional view of the pot cover according to an embodiment of the present application;

[0030] Figure 2 It is an enlarged view of A part of Figure 1

[0031] Figure 3 It is a top view of the inner cover according to an embodiment of the present application;​

[0032] Figure 4 For Figure 3 Enlarged view of B part of

[0033] Wherein,

[0034] 1, face cover;

[0035] 2, cover;

[0036] 3, inner cover; 31, mounting port; 32, backflow hole; 33, liquid collecting groove; 34, guide hole;

[0037] 4, backflow valve;

[0038] 5, steam exhaust pipe; 51, steam inlet section; 52, steam outlet section; 53, first contraction section; 54, introduction port; 55, drip edge;

[0039] 6, valve cover; 61, steam exhaust port; 62, cold air port; 63, blocking rib;

[0040] 7, introduction pipe; 71, cold air introduction section; 72, second contraction section;

[0041] 8, sealing element;

[0042] 9, mixing chamber. DETAILED DESCRIPTION

[0043] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail with reference to the accompanying drawings.

[0044] In the following description, a lot of specific details are set forth in order to facilitate a thorough understanding of the application, but the application can also be implemented in other ways different from those described herein, therefore, the protection scope of the application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the application and the features in each embodiment can be combined with each other without conflict.

[0045] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and 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 particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation of the present application.

[0046] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connection", "fixed", and the like should be construed as broadly as possible, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection, and can also be communication; can be direct connection, or indirect connection through intermediate medium; can be internal communication of two elements, or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0048] As shown in Figures 1 to 4 An optimized anti-overflow cooking appliance includes a pot body with a cooking cavity and a pot cover for opening or covering the cooking cavity, and a steam valve assembly is arranged on the pot cover, the steam valve assembly includes a valve cover 6, a valve seat and a steam exhaust pipe 5, the valve cover 6 is provided with a steam exhaust port 61 communicating with the outside, the valve cover 6 and the valve seat cooperate to form a mixing cavity 9, the valve seat is provided with a backflow area capable of communicating the mixing cavity 9 and the cooking cavity, the steam exhaust pipe 5 includes an inlet steam section 51 and an outlet steam section 52 bent relative to the inlet steam section 51, the outlet steam end of the outlet steam section 52 is located above the backflow area, the backflow area is provided with a plurality of backflow holes 32, and at least part of the backflow holes 32 are non-circular in cross-sectional shape.

[0049] The cross section of the backflow hole 32 of the backflow area refers to the cross section obtained by cutting in the horizontal direction. The cross-sectional shape of part of the backflow holes 32 of the backflow area may, for example, be long strip-shaped, fan-shaped, etc.

[0050] The steam outlet section 52 of the steam exhaust pipe 5 is bent compared to the steam inlet section 51. During cooking, the steam in the cooking cavity will flow through the bent part of the steam exhaust pipe 5 before entering the steam outlet section 52 from the steam inlet section 51. The existence of the bent part plays a role in blocking and changing the direction of the steam. In the process of turning, it not only realizes the breaking of bubbles, but also increases the kinetic energy loss of the fluid, which helps to realize the liquefaction and condensation of the steam. Especially during the cooking process of rice soup and other foods, when the cooking cavity is boiling, it will push some rice grains or small particle food materials to rise and enter the steam inlet section 51. Due to the existence of the bent part, it will block and impact such solid particles, so that such solid particles fall back into the cooking cavity through the steam inlet of the steam inlet section 51, thereby greatly reducing the probability of the steam exhaust pipe 5 being blocked, ensuring that the steam can smoothly pass through the steam exhaust pipe 5 into the mixing chamber 9, and finally be discharged from the steam exhaust port 61.

[0051] Moreover, the steam outlet section 52 is bent relative to the steam inlet section 51, so that the steam outlet end of the steam outlet section 52 can be located above the backflow area. When the steam is discharged from the steam outlet section 52 into the mixing chamber 9, it will not only experience a change in flow area and thus a change in pressure, but also experience a change in flow rate and a change in temperature. The collective effect of various changes on the steam and the steam bubbles it entrains will cause a sudden change in the surface tension of the steam bubbles, breaking the bubbles or making large bubbles into small bubbles. This not only helps to improve the anti-overflow effect, but also helps the slurry to fall back during the breaking process. Since the steam outlet end of the steam outlet section 52 is located above the backflow area, whether it is condensed water or slurry after breaking, it can easily fall into the backflow area to wait for backflow, improving the backflow efficiency and reducing the accumulation of liquid in the mixing chamber 9.

[0052] The reflux zone is provided with several reflux holes 32. Since liquids have surface tension, when liquids pass through the reflux holes 32, a thin film forms on the hole wall. Due to surface tension, this film contracts inward, forming a concave liquid surface within the hole. The curvature of the liquid surface generates an additional pressure pointing inward, reducing the effective size of the hole. Especially when the cross-sectional shape of the reflux hole 32 is circular, due to its geometric characteristics, the surface tension is evenly distributed circumferentially, resulting in a larger curvature of the liquid surface in the circular reflux hole 32 and a greater additional pressure generated by the surface tension. This further leads to a significant reduction in the effective size of the reflux hole 32. Moreover, the surface tension of the liquid creates resistance at the inlet and outlet of the circular reflux hole 32. At the inlet, surface tension hinders the liquid's entry, requiring the liquid to overcome greater pressure to pass through the reflux hole 32. At the outlet, surface tension makes it difficult for the liquid to flow out smoothly, creating a back pressure. This resistance effectively reduces the effective flow area of ​​the reflux hole 32, lowering its flow rate and velocity. Therefore, at least some of the reflux holes 32 in this application have a non-circular cross-sectional shape. For reflux holes 32 with a non-circular cross-sectional shape, when liquid flows through such reflux holes 32, the surface tension is non-uniformly distributed in the circumferential direction of the reflux holes 32, thereby reducing the curvature of the liquid surface at the reflux holes 32, reducing the additional pressure generated therefrom, and reducing the reduction of the effective flow area of ​​the reflux holes 32. This ensures the reflux flow rate and reflux velocity in the reflux zone, allowing the slurry and condensate after defoaming to flow smoothly back through the reflux zone.

[0053] The pot lid in this application includes a top cover 1, a liner 2, and an inner cover 3. Preferably, the inner cover 3 is detachably installed on the liner 2 to facilitate thorough cleaning by the user. The steam valve assembly in this application can be configured in any of the following embodiments:

[0054] Implementation method one: such as Figures 1 to 4 As shown, the valve cover 6 and the liner 2 are separate molded parts. A part of the inner cover 3 constitutes the valve seat. The steam valve assembly also includes a sealing element 8 that clamps and fixes the valve cover 6 and the liner 2. The sealing element 8 has a lower sealing lip that extends downward to abut against the upper surface of the inner cover 3 for sealing. The valve cover 6, the sealing element 8 and the inner cover 3 cooperate to form a mixing chamber 9. The inner cover 3 is provided with an installation port 31 for installing the exhaust pipe 5. The exhaust pipe 5 is installed and fixed at the installation port 31. The reflux area is provided in the inner cover 3.

[0055] Implementation Method 2: This implementation method is not illustrated. The structure of this implementation method is basically the same as that of implementation method 1. The difference is that in this implementation method, the valve cover and the liner are integrally formed so that the valve cover constitutes part of the liner. The sealing element is clamped and fixed between the liner and the inner cover to prevent steam from leaking from the mixing chamber.

[0056] As a preferred embodiment of the present application, as shown in Figure 2 The backflow area is provided with a backflow valve 4 which is movable along the valve seat to open or close the backflow holes 32. By providing the backflow valve 4 in the backflow area, the opening and closing of the backflow holes 32 can be realized, so that the backflow holes 32 are closed at appropriate time to avoid steam overflowing from the backflow holes 32, ensuring that the steam flows along the preset flow path, and the backflow holes 32 are also opened at appropriate time to discharge the accumulated condensed water. In a preferred embodiment, the movement of the backflow valve 4 is a non-powered movement, i.e. when the pressure in the cooking cavity of the cooking utensil reaches a certain threshold value and a certain amount of condensed water accumulates in the backflow area, the backflow valve 4 is opened to make the condensed water fall smoothly, avoiding the condensed water existing in the mixing chamber 9, avoiding the need to provide a separate power mechanism for driving the movement of the backflow valve 4, simplifying the structure design and reducing the cost.

[0057] In a specific example, as shown in Figure 2 The backflow valve 4 includes a mounting portion, a guide portion and a valve bottom plate arranged in sequence from top to bottom, the valve seat is provided with a guide hole 34 matched with the guide portion, the backflow valve 4 is a silica gel piece, the mounting portion is pressed and mounted to the valve seat through the guide hole 34, and after mounting, the guide portion can slide along the guide hole 34, and the valve bottom plate covers each backflow hole 32 in projection toward the valve seat, so that when the backflow valve 4 floats to a certain position, the valve bottom plate can seal the backflow hole 32 to avoid steam backflow from the backflow hole 32.

[0058] As a preferred embodiment of the present application, as shown in Figure 1 and Figure 2 The steam outlet section 52 extends in the transverse direction, the outer periphery of the steam outlet section 52 is of a variable diameter structure to form at least one water droplet guide 55 at the outer periphery of the steam outlet section 52, and the water droplet guide 55 is located above the backflow area. According to the Coanda effect, fluid has a tendency to flow along a convex surface. The transverse extension arrangement of the steam outlet section 52 and the water droplet guide 55 formed by the variable diameter structure can change the flow path of the condensed water attached to the outer surface of the steam outlet section 52, so that the condensed water is accumulated and dripped at the water droplet guide 55, and the water droplet guide 55 located above the backflow area can make the condensed water accumulated at the water droplet guide 55 fall into the backflow area when dripping, facilitating the collection of liquid by the backflow area and improving the backflow efficiency.

[0059] As a preferred embodiment of the present application, the cross-sectional areas of at least some of the backflow holes 32 are different. The cross-sectional area of a backflow hole 32 refers to the area of the cross section obtained by cutting the backflow hole 32 in the horizontal direction. Because the mixing chamber 9 contains not only condensed water formed by steam cooling, but also solid particles such as rice grains and the like that are precipitated after steam bubbles entraining food materials burst, the present embodiment can prevent all of the backflow holes 32 from being blocked by the same kind of food residue and thus affect the backflow effect, thereby ensuring smooth backflow of the liquid in the backflow area.

[0060] As a preferred embodiment of the present application, as shown in Figure 2 part of the valve seat is recessed toward the direction away from the mixing chamber 9 to form a sump 33, and the backflow area is located at one side of the sump 33. By providing the sump 33, the liquid in the mixing chamber 9 can be uniformly collected and concentrated in the sump 33, and the backflow area is located at one side of the sump 33, so that the steam valve assembly can be optimized in the limited structural space to achieve a better liquid collection effect. In addition, the sump 33 formed by the recess can increase the structural strength of the valve seat, so that the valve seat is more stable when subjected to the steam pressure and the impact of the condensed water, thereby improving the anti-deformation ability of the valve seat.

[0061] In a preferred embodiment, as shown in Figure 2 the sump 33 includes a bottom wall and a side wall connecting the bottom wall and the remaining area of the valve seat, and the connection positions of the bottom wall and the side wall and the connection positions of the side wall and the remaining area of the valve seat are both arc-shaped transitions, so as to facilitate the user to thoroughly clean the solid particles attached to the sump 33, reduce the cleaning difficulty, and avoid cleaning dead angles.

[0062] As a preferred embodiment of the present application, as shown in Figure 2 the projection of the steam outlet 61 in the horizontal direction and the projection of the steam inlet section 51 in the horizontal direction both fall into the sump 33, and the projection of the steam outlet 61 in the horizontal direction is located on the opposite side of the backflow area from the steam inlet section 51. In the present embodiment, the relative positional relationship between the steam outlet 61, the steam inlet section 51 and the sump 33 enables the sump 33 to directly receive the liquid falling from the steam outlet 61 and the liquid falling from the outer surface of the steam inlet section 51, which helps to improve the liquid collection efficiency of the sump 33. In addition, the projection of the steam outlet 61 in the horizontal direction is located on the opposite side of the backflow area from the steam inlet section 51, in combination with the relative positional relationship between the steam outlet end of the steam outlet section 52 and the backflow area, it can be inferred that the steam outlet end of the steam outlet section 52 is also located on the opposite side of the steam inlet section 51 from the backflow area, thereby greatly extending the steam flow path in the limited structural space of the steam valve assembly and improving the bubble breaking efficiency.

[0063] Further, as shown in Figure 2 The exhaust pipe 5 has a transition section connecting the inlet section 51 and the outlet section 52, the inlet section 51 extends vertically, and the transition section extends in an arc shape to form a flow guide surface on the outer periphery of the transition section and the inlet section 51. The arc-shaped extension of the transition section and the vertical extension of the inlet section 51 enable the condensate attached to the outer periphery of the inlet section 51 and the transition section to smoothly flow back through the flow guide surface, further improving the liquid collection efficiency of the liquid collection tank 33.

[0064] As a preferred embodiment of the present application, as shown in Figure 2 The outlet section 52 has a first contraction section 53 with a reduced inner diameter, the first contraction section 53 is provided with an inlet 54, the valve cover 6 is provided with a cold air port 62, and the outlet end and the exhaust port 61 are located on opposite sides of the cold air port 62. The cold air introduced through the cold air port 62 is guided into the first contraction section 53 through the inlet 54. By providing the first contraction section 53 with a reduced inner diameter in the outlet section 52, the steam flowing into the first contraction section 53 is accelerated due to the provision of the first contraction section 53, thereby causing a decrease in pressure at the first contraction section 53. The change in pressure and flow rate causes a sudden change in the surface tension of the steam bubbles, breaking the bubbles or reducing the size of the bubbles. The cold air introduced through the cold air inlet is guided into the first contraction section 53. According to the Venturi principle, the external cold air is introduced into the low-pressure area, and the introduction of the cold air further impacts the steam bubbles, not only achieving defoaming but also cooling the steam bubbles to condense them into liquid, further improving the defoaming effect. Even if high-power cooking is used during cooking, the exhaust port 61 of the steam valve assembly will not have continuous bubbles overflowing, greatly improving the anti-overflow effect of the cooking utensil. The outlet end and the exhaust port 61 are located on opposite sides of the cold air port 62, which enables the steam discharged from the outlet end to pass through the cold air port 62 before reaching the exhaust port 61, thereby further reducing the temperature of the steam and facilitating the formation of condensate, thereby facilitating the collection of the return flow area.

[0065] As a preferred embodiment of the present embodiment, as shown in Figure 2As shown, the steam valve assembly further comprises an introduction pipe 7 which is in communication with the cold air outlet 62 and the introduction inlet 54, the valve cover 6 is provided with a blocking rib 63 which extends towards the mixing cavity 9, the blocking rib 63 is located between the steam outlet 61 and the introduction pipe 7, and there is a steam passing gap between the blocking rib 63 and the steam outlet pipe 5. In this embodiment, the arrangement of the introduction pipe 7 can form a guiding path for the cold air from the cold air outlet 62 to the introduction inlet 54, so that as much cold air as possible can enter the first contraction section 53, thereby assisting the steam condensation and bubble breaking. In this embodiment, the arrangement of the blocking rib 63 and the existence of the steam passing gap can further prolong the flow path of the steam, and can make the steam experience diversified flow cross-sectional areas in the process of entering the steam outlet pipe 5, being discharged from the steam outlet pipe 5, entering the mixing cavity 9, flowing through the steam passing gap and being discharged from the steam outlet 61, so as to make the steam flow velocity change in multiple ways, thereby greatly improving the bubble breaking efficiency and the formation efficiency of the condensed water, and further improving the anti-overflow effect. In addition, the arrangement of the introduction pipe 7, the blocking rib 63 and the like can form a drainage for the condensed water attached to the valve cover 6, facilitate the dripping of the condensed water, and thereby facilitate the collection and discharge of the condensed water by the reflux area.

[0066] Further, one end of the introduction pipe 7 is in communication with the cold air outlet 62, and the other end is in communication with the introduction inlet 54, so that the introduced cold air can directly enter the first contraction section 53 through the introduction inlet 54, thereby avoiding the contact between the cold air and the hot steam in the mixing cavity 9 in the process of introduction, so as to avoid the temperature rise of the cold air, thereby affecting the bubble breaking effect.

[0067] In this embodiment, the structure of the introduction pipe 7 can adopt any one of the following embodiments:

[0068] Embodiment 1: This embodiment 1 is not shown, in this embodiment 1, the inner diameter of the introduction pipe is consistent from the air inlet end to the air outlet end, so as to facilitate the processing and molding of the introduction pipe.

[0069] Embodiment 2: As Figure 2As shown, the introduction pipe 7 is provided with a second contraction section 72, and at least part of the steam from the steam outlet end of the exhaust pipe 5 is discharged into the mixing chamber 9 and then discharged from the exhaust port 61 after passing through the introduction pipe 7. The introduction pipe 7 is provided with a second contraction section 72 to form a low pressure area at the introduction pipe 7, which not only more efficiently introduces cold air into the first contraction section 53 and improves the cold air introduction efficiency, but also according to Bernoulli's principle, the cold air speed increases after passing through the second contraction section 72, so that the cold air can obtain greater injection momentum when entering the first contraction section 53, thereby helping the cold air to more effectively mix with the high-temperature steam in the exhaust pipe 5, improving the breaking bubble efficiency and the anti-overflow effect. In the technical solution, at least part of the steam flows from the steam outlet end of the exhaust pipe 5 to the exhaust port 61, and the introduction pipe 7 introduces cold air, so the temperature of the introduction pipe 7 is lower than the temperature in the mixing chamber 9. When the steam passes through the introduction pipe 7, not only can it break the bubbles, but also can cool the steam, which not only reduces the steam temperature, but also helps to form condensed water, thereby improving the anti-overflow effect.

[0070] In a preferred example, as shown in the drawings, Figure 2 The introduction pipe 7 is also provided with a cold air introduction section 71 communicating with the second contraction section 72, and the inner diameter of the cold air introduction section 71 gradually decreases from the side close to the cold air port 62 to the side close to the second contraction section 72 to form a tapered structure. That is, along the flow direction of the cold air, the cold air introduction section 71 is located on the upstream side of the second contraction section 72. The tapered structure design of the cold air introduction section 71 can reduce the energy loss of the cold air during the flow process. Compared with a straight pipe or a pipe structure with a sudden change in cross section, the tapered structure in this example can more effectively utilize the kinetic energy of the cold air and reduce the energy loss caused by the flow resistance of the cold air. Moreover, the tapered structure can gradually accelerate the cold air during the flow process. As the inner diameter of the cold air introduction section 71 gradually decreases, the flow rate of the cold air gradually increases, so that the cold air has a higher speed when it enters the second contraction section 72, improving the injection effect of the cold air when it enters the introduction port 54 from the second contraction section 72. This not only more effectively introduces the cold air into the first contraction section 53, but also enhances the mixing effect of the cold air and the steam, improving the breaking bubble efficiency.

[0071] Furthermore, the second contraction section 72 and the cold air introduction section 71 are integrally injection molded, and the cold air introduction section 71 is a thin-walled structure, so that the cold air introduction section 71 has certain elastic properties and is in abutment and sealed with the cold air port 62 after the steam valve assembly is assembled. The cold air introduction section 71 not only has the function of guiding the flow of cold air, but also can seal the joint position of the introduction pipe 7 and the cold air port 62 to prevent cold air from leaking into the mixing chamber 9, and also can prevent the steam in the mixing chamber 9 from overflowing from the cold air port 62.

[0072] The places not mentioned in the present application can be realized by using or referring to the existing technology.

[0073] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the difference from other embodiments.

[0074] The above only describes the embodiments of the present application and is not intended to limit the present application. The technical features or structures in the foregoing different embodiments can be combined as needed to form other specific technical solutions. Various modifications and changes can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. An optimized spilling prevention cooking appliance comprising a pot body having a cooking cavity and a pot cover for opening or closing the cooking cavity, characterized in that, The steam valve assembly is provided on the pot cover, and includes a valve cover, a valve seat and a steam discharge pipe. The valve cover is provided with a steam discharge port in communication with the outside. The valve cover and the valve seat cooperatively define a mixing chamber. The valve seat is provided with a backflow area capable of communicating the mixing chamber and the cooking chamber. The steam discharge pipe has a steam inlet section and a steam outlet section bent relative to the steam inlet section. The steam outlet end of the steam outlet section is located above the backflow area. The backflow area is provided with a plurality of backflow holes. At least part of the backflow holes have a non-circular cross-sectional shape.

2. The cooking appliance of claim 1, wherein The steam outlet section extends in a transverse direction. The outer periphery of the steam outlet section has a variable diameter structure to form at least one water droplet guide on the outer periphery of the steam outlet section. The water droplet guide is located above the backflow area.

3. The cooking appliance of claim 1, wherein The backflow area is provided with a backflow valve movable along the valve seat to open or close the backflow holes.

4. The cooking appliance of claim 1, wherein The cross-sectional areas of at least part of the backflow holes are different.

5. The cooking appliance of claim 1, wherein Part of the valve seat is recessed in a direction away from the mixing chamber to form a liquid collection groove. The backflow area is located on one side of the liquid collection groove.

6. The cooking appliance of claim 5, wherein The projection of the steam discharge port in the horizontal direction and the projection of the steam inlet section in the horizontal direction both fall within the liquid collection groove. The projection of the steam discharge port in the horizontal direction is located on two opposite sides of the steam inlet section axis relative to the backflow area.

7. The cooking appliance of claim 6, wherein The steam discharge pipe has a transition section connecting the steam inlet section and the steam outlet section. The steam inlet section extends in a vertical direction. The transition section extends in an arc shape to form a flow guide surface on the outer periphery of the transition section and the steam inlet section.

8. The cooking appliance of claim 1, wherein The steam outlet section has a first contraction section with a reduced inner diameter. The first contraction section is provided with an inlet. The valve cover is provided with a cold air port. The steam outlet end and the steam discharge port are located on two opposite sides of the cold air port. Cold air introduced through the cold air port is guided into the first contraction section through the inlet.

9. The cooking appliance of claim 8, wherein The steam valve assembly further includes an introduction pipe in communication with the cold air port and the inlet. The valve cover is provided with a blocking rib extending towards the mixing chamber. The blocking rib is located between the steam discharge port and the introduction pipe. A steam gap exists between the blocking rib and the steam discharge pipe.

10. The cooking appliance of claim 9, wherein The introduction pipe is provided with a second contraction section. Steam introduced into the steam discharge pipe from the steam outlet end is discharged into the mixing chamber and then guided through the introduction pipe before being discharged from the steam discharge port.

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