Spacer, steam valve, cover and cooking appliance

Abstract

The utility model provides a kind of spacer, steam valve, cover and cooking utensil.Spacer is used for cooking utensil or for the steam valve of cooking utensil, cooking utensil includes cooking cavity, cooking utensil or steam valve is provided with steam passage with cooking cavity intercommunication.Spacer is used to be arranged between steam passage and external environment and has exposed surface exposed to external environment, at least part exposed surface is provided with several micropores, which intercommunicate steam passage and external environment, on the surface where exposed surface is located, micropore has the length dimension of hole itself and the width dimension of hole itself, the size of width dimension is D1, 0.01mm≤D1≤1mm, alternatively, the cross-sectional area of micropore is S1, 0.7×10 ‑4 mm 2 ≤S1≤100mm 2 。According to the spacer of the utility model, during cooking utensil cooking, water vapor condenses into small water droplets at micropore under the action of temperature difference, and then forms water film, which can reduce water loss in the pot body and solve the problem of dry surface layer of food (such as rice).

Description

Technical Field

[0001] This utility model generally relates to the technical field of kitchen household appliances, and more specifically to a spacer, a steam valve, a cover, and a cooking utensil. Background Technology

[0002] Rice cooker steam valves are generally open and cannot be sealed. This means that after cooking, the moisture inside the cooking cavity cannot be locked in, resulting in the rice on the surface of the rice being too dry. Current rice cookers use a steam cup inside the cooker to spray steam to replenish moisture in order to solve this problem, but this method is energy-intensive, complex, and costly.

[0003] Therefore, there is a need to provide a spacer, steam valve, cover, and cooking appliance to at least partially solve the above problems. Utility Model Content

[0004] The utility model description section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] To at least partially solve the above problems, the first aspect of this utility model provides a spacer for a cooking appliance or a steam valve for a cooking appliance, the cooking appliance including a cooking chamber, and the cooking appliance or the steam valve being provided with a steam passage communicating with the cooking chamber.

[0006] The spacer is disposed between the steam channel and the external environment and has an exposed surface exposed to the external environment. At least a portion of the exposed surface has a plurality of micropores communicating between the steam channel and the external environment. On the surface of the exposed surface, the micropores have a length dimension and a width dimension, wherein the width dimension is D1, 0.01mm≤D1≤1mm, or the cross-sectional area of ​​the micropore is S1, 0.7×10⁻⁶. -4 mm 2 ≤S1≤100mm 2 .

[0007] According to this design, the spacer is connected to the outlet of the steam channel, which communicates with the outside. The exposed surface of the spacer is exposed to the environment. During cooking, the external ambient temperature is lower than the temperature of the steam exiting the steam channel. When the steam passes through the micropores, it condenses into small water droplets due to the temperature difference. These droplets then form a water film within the micropores due to surface tension. When a water film forms in most or all of the micropores, this film creates a seal around the cooking cavity, reducing moisture loss and preventing the surface of food (such as rice) from becoming too dry. The water film also prevents the food from oxidizing too quickly, thus preserving its freshness.

[0008] Optionally, 0.1mm ≤ D1 ≤ 0.5mm; or,

[0009] When the micropores are centrally symmetrical, regularly shaped micropores, 7.85 × 10 -3 mm 2 ≤S1≤0.2mm 2 ;or,

[0010] When the micropore itself has an elongated shape, similar to a micropore, 7.85 × 10 -3 mm 2 ≤S1≤50mm 2 .

[0011] According to the spacer in this solution, the size of the micropores is easy to process and easy to form a water film. When the micropores themselves are elongated micropores, such as elongated rectangular pores, the size of the pore in its own length dimension can be up to 100mm, thus it can have a relatively large cross-sectional area.

[0012] Optionally, the micropores on the exposed surface may be circular, elliptical, polygonal, rectangular, fan-shaped, or S-shaped.

[0013] Optionally, in a cross-section passing through the axis of the micropore:

[0014] The micropore structure is a columnar pore of uniform thickness; or

[0015] The micropores include multiple columnar pores with inconsistent radial dimensions, and the multiple columnar pores are arranged along the axial direction of the micropores; or

[0016] The micropores include a funnel-shaped structure with varying diameters.

[0017] The form of the micropores can be flexibly set according to the spacer in this scheme.

[0018] Optionally, the exposed surface is planar; or,

[0019] The exposed surface is constructed as a convex surface that protrudes towards the external environment relative to the steam passage; or,

[0020] The exposed surface is constructed as a concave surface that is recessed relative to the external environment and faces the steam passage.

[0021] The form of the exposed surface can be flexibly set according to the spacer of this scheme.

[0022] Optionally, the wall thickness h of the region of the spacer with micropores is 0.15mm≤h≤0.3mm.

[0023] According to this solution, micropores are easy to manufacture and can ensure that the structural strength of the spacer meets the requirements for use.

[0024] Optionally, the micropores are circular, the pore diameter is 0.2 mm to 0.3 mm, and the number of micropores is less than or equal to 50.

[0025] According to this scheme, the micropores are easy to process, the quantity is appropriate, and a water film can be formed at the micropores.

[0026] Optionally, the area of ​​the exposed surface exposed to the external environment is S2,3 mm. 2 ≤S2≤8000mm 2 .

[0027] Optionally, 19mm 2 ≤S2≤2000mm 2 .

[0028] Optionally, the exposed surface is circular, and the diameter of the exposed surface is D2, where 2mm≤D2≤100mm.

[0029] Optionally, 5mm≤D2≤50mm.

[0030] According to this scheme, the area of ​​the exposed surface is sufficient to accommodate an appropriate number of micropores.

[0031] Optionally, the exposed surface is made of metal.

[0032] According to this solution, the metal material has good strength, so the spacer can have a small thickness, which facilitates the processing of micropores.

[0033] Optionally, the spacer is provided with a hydrophobic coating or the spacer is made of a hydrophobic material.

[0034] According to this scheme, hydrophobic coatings and hydrophobic materials are beneficial for the formation of water films.

[0035] Optionally, when the spacer is provided with a hydrophobic coating and / or the spacer is made of a hydrophobic material, the size of the micropore corresponding to D1 is D1', and D1' is a size greater than D1 by 0.22 mm to 0.72 mm.

[0036] According to this scheme, the hydrophobic coating and hydrophobic material are conducive to the formation of a water film, so the micropores can be slightly larger to facilitate processing.

[0037] Optionally, the spacer is constructed as a single component.

[0038] According to this solution, the spacers are easy to manufacture and the processing technology is simplified.

[0039] Optionally, the spacer includes a connecting portion and a mesh plate, the mesh plate being disposed at the center of the connecting portion, the micropores being the mesh openings of the mesh plate, and the connecting portion being used to connect to the cooking appliance.

[0040] According to this solution, the micro-holes do not require additional processing, and the mesh is easy to obtain and replace, reducing the maintenance cost of the spacers.

[0041] The second aspect of this utility model provides a steam valve for a cooking appliance. The steam valve has an internal steam passage for communicating with the cooking chamber of the cooking appliance. The steam valve is detachably or fixedly connected to the cooking appliance.

[0042] The steam valve includes a spacer as described in the first aspect of the present invention, the spacer being detachably or fixedly disposed between the steam passage and the external environment.

[0043] According to this design, the steam valve has a spacer connected to the outlet of the steam passage that connects to the outside. The exposed surface is exposed to the environment, thus its temperature is relatively low. When water vapor passes through the micropores, condensation forms due to the temperature difference. This condensation adheres to the micropores, forming a water film that creates a seal within the cooking cavity. This not only reduces moisture loss from the cooker and solves the problem of food (such as rice) becoming too dry on the surface, but also prevents the food from oxidizing too quickly, achieving a preservation effect.

[0044] The third aspect of this utility model provides a cover for a cooking utensil, wherein the cover has an internal steam channel for communicating with the cooking cavity of the cooking utensil.

[0045] The cover includes a spacer as described in the first aspect of the present invention, the spacer being detachably or fixedly disposed between the steam passage and the external environment; or, the cover includes a steam valve as described in the second aspect of the present invention, the steam valve being detachably or fixedly disposed on the cover.

[0046] According to the lid of this solution, the spacer is set between the external environment and the steam channel. When water vapor passes through the micropores, it forms condensate under the action of temperature difference. The condensate adheres to the micropores to form a water film, thereby forming a certain sealing effect on the cooking cavity. This not only reduces the loss of moisture in the pot and solves the problem of the surface of food (such as rice) being too dry, but also prevents the food in the pot from being oxidized too quickly, thus achieving the effect of preservation.

[0047] The fourth aspect of this utility model provides a cooking utensil.

[0048] The cooking appliance includes: a cooking cavity, a steam passage communicating with the cooking cavity, and a spacer according to the first aspect of the present invention, wherein the spacer is detachably or fixedly disposed in the cooking appliance; or

[0049] The cooking appliance includes: a cooking chamber and a steam valve according to the second aspect of the present invention, wherein the steam valve is detachably or fixedly disposed in the cooking appliance; or

[0050] The cooking appliance includes a cooking cavity and a cover according to the third aspect of the present invention.

[0051] According to the cooking appliance of this solution, when the cooking appliance, such as a rice cooker, is cooking rice or other ingredients, during the cooking process, because a spacer with several micropores is set between the steam channel and the external environment, when the steam overflows, a water film is formed at the several micropores of the spacer. The water film plays the role of isolating the cooking cavity from the external environment, thereby achieving the function of sealing and locking water or preserving freshness in the cooking cavity. Attached Figure Description

[0052] The following drawings, which illustrate embodiments of the present invention, are incorporated herein as part of the present invention for understanding the invention. The drawings show embodiments of the present invention and their descriptions, serving to explain the principles of the present invention. In the drawings,

[0053] Figure 1A A perspective view of a cooking utensil according to a specific embodiment of the present utility model;

[0054] Figure 1B This is a top view of the cooking appliance shown in Figure 1;

[0055] Figure 2 This is a side sectional view of the cooking utensil shown in Figure 1;

[0056] Figure 3 A three-dimensional schematic diagram of a steam valve according to the first embodiment of the present invention;

[0057] Figure 4 for Figure 3 A schematic diagram of the shape of the micropores on the exposed surface;

[0058] Figure 5 for Figure 3 A side sectional view of a first example of a steam valve;

[0059] Figure 6A and Figure 6B for Figure 5 The diagram shows a side view of the steam valve.

[0060] Figure 7 Figure 1 shows a side sectional view of a partial structure of the cooking appliance, in which the second valve core assembly is located in the floating position;

[0061] Figure 8 Figure 1 shows a side sectional view of a partial structure of the cooking appliance, where the second valve core assembly is located at the assembly position.

[0062] Figure 9 for Figure 5 A side view of the valve cover of the steam valve shown.

[0063] Figure 10 for Figure 5 A three-dimensional schematic diagram of a first example of the lower valve cover of the steam valve shown;

[0064] Figure 11 for Figure 10 The diagram shows a top view of the valve cover.

[0065] Figure 12 for Figure 5 A perspective view of a second example of the lower valve cover of the steam valve shown;

[0066] Figure 13 for Figure 5 A top view of the first valve core body of the steam valve shown;

[0067] Figure 14 for Figure 13 A bottom view of the first valve core body shown;

[0068] Figure 15 for Figure 5 A three-dimensional schematic diagram of the second valve core component of the steam valve shown;

[0069] Figure 16 for Figure 15 A top view schematic diagram of the second valve core component shown;

[0070] Figure 17 and Figure 18 for Figure 5 A side sectional view of a specific example of the second valve core assembly of the steam valve shown;

[0071] Figure 19 and Figure 20 for Figure 5 The schematic diagram of a partial structure of the steam valve shown illustrates the microporous structure under different implementations;

[0072] Figure 21 for Figure 5 A side sectional view of a portion of the exposed structure of the steam valve shown.

[0073] Figure 22 This is an example of the pressure and temperature change curves inside the cooking cavity of a specific cooking process in the cooking appliance shown in Figure 1.

[0074] Figure 23 and Figure 24 Figure 1 is a schematic side sectional view of a partial structure of the cooking appliance shown, which illustrates... Figure 3 Partial structure of the second example of the steam valve shown;

[0075] Figure 25 for Figure 3 A side sectional view of a third example of a steam valve shown;

[0076] Figure 26 for Figure 25 A bottom perspective three-dimensional schematic diagram of the first valve core body of the steam valve shown;

[0077] Figure 27 Figure 1 is a schematic side sectional view of a partial structure of the cooking appliance shown, which illustrates... Figure 3 The fourth example of a steam valve is shown;

[0078] Figure 28 This is a side sectional view of a steam valve according to the second embodiment of the present invention;

[0079] Figure 29 This is a side sectional view of a steam valve according to the third embodiment of the present invention.

[0080] Figure 30 for Figure 29 The diagram shows a top view of the steam valve; and

[0081] Figure 31 This is a side sectional view of a steam valve according to the fourth embodiment of the present invention. Detailed Implementation

[0082] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with embodiments of the present invention.

[0083] To fully understand the embodiments of this utility model, a detailed structure will be presented in the following description. Obviously, the implementation of the embodiments of this utility model is not limited to the specific details familiar to those skilled in the art.

[0084] It should be understood that the terminology used herein is intended only to describe particular embodiments and is not intended to limit the invention. The singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. When the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0085] The ordinal numbers such as "first" and "second" used in this utility model are merely identifiers and do not have any other meaning, such as a specific order. Furthermore, for example, the term "first component" does not imply the existence of a "second component," and the term "second component" does not imply the existence of a "first component." It should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," "outer," and similar expressions used in this utility model are for illustrative purposes only and are not intended to be limiting.

[0086] The specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings, which show representative embodiments of the present invention and are not intended to limit the present invention.

[0087] This utility model provides a spacer, a steam valve, a cover, and a cooking appliance.

[0088] Please see Figures 1A to 2In the first embodiment, the cooking appliance 100 includes a lid 110 and a pot body 120. The lid 110 is closable and connectable to the pot body 120. The pot body 120 has, for example, a cylindrical inner pot storage portion 128 with an upward-facing opening. The inner pot 129 can be fixedly disposed in the inner pot storage portion 128, or can be freely placed into or removed from the inner pot storage portion 128 for easy cleaning. That is, the inner pot 129 is detachably connected to the inner pot storage portion 128. The inner pot 129 is typically made of metal and has a circular opening for holding food to be heated, such as rice or soup. The pot body 120 includes a heating device 131 (e.g., a coil) for heating the inner pot 129.

[0089] It is understood that the cooking appliance 100 of this utility model can be a rice cooker, and in addition to the function of cooking rice, the cooking appliance 100 can also have various functions such as cooking porridge. The cooking appliance 100 can also be a small household electric heating appliance such as an electric steamer, a soy milk maker, or a blender.

[0090] The lid 110 is closably connected to the pot body 120. The lid 110 has a shape substantially corresponding to the pot body 120. The lid 110 is closably mounted on the pot body 120. Those skilled in the art will understand that, to facilitate opening the lid 110, the cooking appliance 100 may also be provided with a first pivot 119 and a torsion spring. Specifically, the first pivot 119 is located on the pot body 120, and the lid 110 is pivotally connected to the pot body 120 around the first pivot 119. The torsion spring is sleeved on the first pivot 119, with its two arms abutting against the lid 110 and the pot body 120 respectively. With this configuration, when the user operates to open the lid, the lid 110 can autonomously pivot to the open position under the elastic force of the torsion spring, making the opening operation of the cooking appliance 100 more convenient and effortless.

[0091] The cooking appliance 100 also includes a lid-opening assembly, which is, for example, disposed on the pot body 120. The lid-opening assembly is used to open the lid 110 when it is closed to the pot body 120, under the user's operation. The aforementioned first pivot 119 and the lid-opening assembly are respectively disposed on opposite sides of the pot body 120. When the user operates the lid-opening assembly on one side of the pot body 120, the lid 110 automatically pivots to the open position under the action of a torsion spring, making the operation of the cooking appliance 100 more convenient and effortless. Furthermore, the cooking appliance 100 also includes a lid-closing component 127. The lid-opening assembly is connected to the lid-closing component 127 to open and close the pot body 120 with the lid 110.

[0092] The lid-opening assembly may include an operating member and a connecting member 126. The operating member is for user operation and is movably connected to the pot body 120, for example, along a first horizontal direction between an initial position and an operating position. The connecting member 126 is pivotally connected to the pot body 120 about an axis extending along a second horizontal direction. The second horizontal direction is perpendicular to the first horizontal direction. The first horizontal direction is, for example, the front-rear direction of the pot body 120, and the second horizontal direction is the left-right direction of the pot body 120. One end (e.g., the lower end) of the connecting member 126 is connected to the operating member for rotation driven by the operating member. The other end (e.g., the upper end) of the connecting member 126 is used to connect to the lid-closing member 127. In the open state, the operating member is in the operating position, and the connecting member 126 is separated from the lid-closing member 127. The operating member, exposed outside the housing 121, may be configured as a lid-opening button 125. The connecting member 126 and the lid-closing member 127 may be configured as cooperating hooks. It is easy to imagine that the operating component can automatically return to its initial position after the pressing pressure is removed. Therefore, the pot body 120 is also provided with an elastic component, for example. Alternatively, the lid opening assembly also includes an elastic component, which is located between the operating component and the middle plate 122. The elastic component is used to drive the operating component to return from the applied position to the initial position.

[0093] In the illustrated embodiment, when opening the lid, the user pushes the operating component to the right in the figure, positioning it in the active position. Specifically, the upper end of the connecting component 126 deflects to the left, separating from the lid-closing component 127, and the lid 110 opens automatically under the action of a torsion spring. The lid 110 is also equipped with multiple function buttons 133 and corresponding indicator lights 137 for the user to operate and view different stages of cooking.

[0094] When the lid 110 is placed on the pot body 120, it covers the inner pot 129, forming a cooking cavity 130 for heating food. Alternatively, the pot body 120 has a cooking cavity 130 for holding and heating food. The pot body 120 may include a base 123, a housing 121 connected to the base 123, and a middle plate 122 disposed inside the housing 121. In a side view, the middle plate 122 is generally T-shaped (see...). Figure 2 The horizontal portion of the middle plate 122 corresponding to the T-shape is located above the outer shell 121. The outer shell 121 is located between the middle plate 122 and the base 123 and can connect the outer periphery of the middle plate 122 and the outer periphery of the base 123 together, so that the middle plate 122, the outer shell 121, and the base 123 together constitute the surface of the pot body 120. The vertical portion of the middle plate 122 corresponding to the T-shape has a hollow structure, forming the inner pot storage part 128. The middle plate 122 can also be connected to the base 123 by fasteners such as screws. The lower part of the base 123 is provided with feet 124 to facilitate the placement of cooking utensils 100. To improve the sealing performance of the lid 110 and the pot body 120 after they are closed, please refer to... Figure 2 The cooking utensil 100 is also provided with a pot opening sealing ring 113. After the lid 110 is closed, the pot opening sealing ring 113 is located between the lid 110 and the inner pot 129, so that the upper edge of the outer periphery of the inner pot 129 is sealed.

[0095] It should be noted that the directional terms used in this article to describe the various parts and components of the cooking appliance 100, such as "up," "down," "above," "below," "upward," "downward," "facing upward," and "facing downward," are relative to the cooking appliance 100 in a horizontal and upright position when the lid 110 is covering the pot body 120. Unless otherwise specified, in the directional terms "inward," "outward," "towards," "inner side," and "outer side," "inner" refers to the area near the center of the cooking appliance 100, and "outer" refers to the area away from the center of the cooking appliance 100.

[0096] Please continue reading. Figures 1A to 2 The lid 110 may include an inner liner 112, a removable lid 114, and a top cover 111. The top cover 111 is the outer shell of the lid 110, and the inner liner 112 is connected to the lower inner side of the top cover 111 and is wrapped by the top cover 111. The lid 110 also includes a circuit board assembly disposed in the inner liner 112 for establishing wiring connections inside the lid 110. The cooking appliance 100 is also provided with a temperature measuring device, which may include a first temperature measuring device 115 and a second temperature measuring device 135. For example, the first temperature measuring device 115 is disposed inside the lid 110 for sensing the steam temperature inside the cooking cavity 130. The second temperature measuring device 135 is disposed inside the pot body 120. The second temperature measuring device 135 (e.g., a thermistor) is disposed near the heating device 131 and can directly monitor the bottom temperature of the inner pot 129 to prevent dry burning or overheating. The removable lid 114 is detachably disposed on the lower surface of the inner liner 112. A removable cover 114 located on the inner liner 112 is used to cover the opening on the upper surface of the inner pot 129 to form a relatively sealed cooking space. Furthermore, the removable cover 114 has an exhaust port 118 communicating with the cooking cavity 130, and an exhaust port sealing ring 117 is provided at the exhaust port 118. The exhaust port sealing ring 117 is fixed to the inner liner 112 by a fixing member 116. An exhaust channel 132 communicating with the cooking cavity 130 is formed above the exhaust port 118. The exhaust channel 132 is formed in the inner liner 112. A first temperature measuring device 115 can monitor the temperature of the steam located at the exhaust channel 132. The volume of the inner pot 129 is greater than or equal to 3L, such as 3L, 4L, 5L, 6L, etc., which can cook sufficient ingredients and facilitates monitoring of steam changes within the cooking cavity 130 at different cooking stages. The rated power of the heating device 131 is P1, where 1300W ≤ P1 and or P1 ≤ 1500W. Preferably, 1300W≤P1≤1500W, under which condition the heating power of the inner pot 129 can be guaranteed to be sufficient.

[0097] Understandably, the cooking appliance 100 also includes a control device (not shown) for controlling the cooking process. This control device could be, for example, a microcontroller unit (MCU), which coordinates the orderly operation of the various components of the cooking appliance 100. For instance, temperature sensors (i.e., the first temperature sensor 115 and the second temperature sensor 135) and the heating element 131 are both electrically connected to the control device. The temperature sensors send signals back to the control device, which processes the signals and then controls the heating element 131 to operate in an orderly manner. In other words, the cooking appliance 100 monitors the temperature of the inner pot 129 in real time through temperature sensors on the pot body 120 and the lid 110, and feeds the data back to the control device. The control device compares this data with a preset cooking program and precisely controls the temperature by adjusting the power of the heating element 131. When an abnormal temperature is detected (such as a risk of dry burning or overflow), the system automatically reduces the power or cuts off the power, forming a closed-loop feedback regulation to ensure the safety of the cooking process and the optimal taste of the food. The control device and the electrical components in the cover 110 are all electrically connected to the circuit board assembly, so that the control device controls the electrical control components in the cover 110 through the circuit board assembly.

[0098] The lid 110 also includes a gas path integration device, such as a steam valve 140. When the lid 110 closes the pot body 120, the gas path integration device connects to the cooking cavity 130 to facilitate steam release. During cooking, if the internal pressure of the cooking cavity 130 exceeds a set value, the gas path integration device automatically opens its channel to release steam, thereby reducing the pressure in the cooking cavity 130 and preventing accidents such as explosions. Alternatively, the steam valve 140 can simply provide a steam release channel.

[0099] Cooking appliance 100 can perform at least one cooking process. The cooking process of cooking appliance 100 includes, for example, a preheating process, a water absorption process, a heating process, a boiling process, a rice-cooking process, and a heat-keeping process (each process is also a stage). The preheating process is used to initially heat the ingredients. In the water absorption process, the ingredients are soaked in warm water at 35-50°C before boiling to fully absorb water and improve the texture of the rice. In the heating process, the ingredients are gradually heated to near-boiling or boiling temperature using high heat, and then maintained at boiling in the boiling process to ensure the ingredients are basically cooked. The rice-cooking process further dries out any remaining free moisture after the ingredients have boiled, further cooking the ingredients. Finally, the heat-keeping process keeps the food warm so that the user can eat hot food. The heat-keeping temperature is, for example, 60-80°C.

[0100] Please see now Figures 3 to 6BThe steam valve 140 includes a housing assembly 159 and a spacer 169. Specifically, a steam passage 172 for communicating with the cooking chamber 130 is formed inside the housing assembly 159. The spacer 169 is connected to the housing assembly 159 and is located between the steam passage 172 and the external environment. The spacer 169 has at least an exposed surface 171 exposed to the external environment. That is, the spacer 169 is used to be disposed between the steam passage 172 and the external environment and has an exposed surface 171 exposed to the external environment. At least a portion of the exposed surface 171 is provided with a plurality of micropores 161 communicating with the steam passage 172 and the external environment. In other words, the steam valve 140 has a steam passage 172 inside, which communicates with the cooking chamber 130 of the cooking appliance 100. It can be understood that the steam valve 140 is part of the cover 110, so it can also be said that the cover 110 has a steam passage 172 inside, which is used to communicate with the cooking cavity 130 of the cooking appliance 100. The cover 110 includes the steam valve 140, which is detachably or fixedly installed on the cover 110.

[0101] Furthermore, such as Figure 4 As shown, on the surface where the exposed surface 171 is located, the microhole 161 has a length dimension L1 and a width dimension L2, where the length dimension L1 is greater than or equal to the width dimension L2. The width dimension L2 of the microhole 161 is D1, where 0.01 mm ≤ D1 ≤ 1 mm. Alternatively, the cross-sectional area of ​​the microhole 161 is S1, 0.7 × 10⁻⁶. -4 mm 2 ≤S1≤100mm 2 Alternatively, the width dimension L2 of the irregularly shaped micro-holes 161 on the exposed surface 171 can be at its widest point, with a dimension D1 of 0.01 mm ≤ D1 ≤ 1 mm. It should be noted that the aforementioned width dimension L2 can be the inner diameter of the micro-holes 161, that is, the dimension in the direction perpendicular to the axial direction of the micro-holes 161.

[0102] According to the spacer 169 in this solution, the spacer 169 is connected to the outlet of the steam channel 172 that communicates with the outside. The exposed surface 171 of the spacer 169 is exposed to the environment. During cooking, the temperature of the external environment is lower than the temperature of the steam discharged from the steam channel 172. When the steam passes through the micropores 161, it condenses into small water droplets at the micropores 161 due to the temperature difference. Then, due to the surface tension, the small water droplets at the micropores 161 form a water film inside the micropores 161. When most or all of the micropores 161 have formed a water film, these water films provide a certain sealing effect on the cooking cavity 130, which can reduce the loss of moisture in the pot body 120 and solve the problem of the surface of food (such as rice) being too dry. The water film also prevents the food in the pot body 120 from being oxidized too quickly, thus achieving a preservation effect.

[0103] The shape and structure of the micropore 161 will now be described. For example, on the surface of the exposed surface 171, the shape of the micropore 161 can be any suitable shape such as circular, elliptical, polygonal (e.g., triangular, quadrilateral, etc.), fan-shaped, or S-shaped. Figure 4 In (a), the micropore 161 is circular. Figure 4 In (b), the micropore 161 is elliptical. Figure 4 In (c), the micropore 161 is square. Figure 4 In (d), micropore 161 is rectangular. Figure 4 In (e), the micropore 161 is trapezoidal. Figure 4 In (f), the micropore 161 is triangular. Figure 4 In (g), the micropores 161 are fan-shaped. Figure 4 In (h), micropore 161 is irregular in shape.

[0104] In the cross section through the axis of the micro-hole 161, the micro-hole 161 can be constructed as a columnar hole of uniform thickness. For example, the cross section of the micro-hole 161 is the aforementioned circular, elliptical, polygonal, fan-shaped, or S-shaped shape, and the size of the cross section is consistent. It directly penetrates the aforementioned spacer 169, thereby forming a columnar hole of uniform thickness (i.e., a cylindrical hole, an elliptical cylindrical hole, a prism hole, a fan-shaped columnar hole, or an S-shaped columnar hole).

[0105] The spacer 169 is detachably or fixedly disposed on the steam valve 140. The spacer 169 is detachably or fixedly disposed between the steam passage 172 and the external environment. In other words, the steam valve 140 includes the spacer 169, which is detachably or fixedly disposed between the steam passage 172 and the external environment. Alternatively, the cover 110 includes the spacer 169, which is detachably or fixedly disposed between the steam passage 172 and the external environment.

[0106] Steam passage 172 includes a first steam passage 173. Housing assembly 159 is also provided with an air inlet 146, which communicates with both the cooking cavity 130 and the first steam passage 173. For example, steam valve 140 also includes an air inlet passage 145, which is disposed in housing assembly 159 and communicates with the cooking cavity 130. The air inlet passage 145 may be connected to the downstream end of the airflow of the aforementioned exhaust passage 132, or directly inserted into the exhaust passage 132. The first steam passage 173 is connected to the downstream end of the air inlet passage 145 and is connected to and communicates with the airflow of the first steam passage 173. The connection point between the first steam passage 173 and the air inlet passage 145 is the air inlet 146. Thus, the steam in the cooking cavity 130 enters the first steam channel 173 through the exhaust port 118, exhaust channel 132, air intake channel 145, and air intake port 146, and can then be discharged to the external environment through the micropores 161.

[0107] It should be explained that the exposed surface 171 is directly exposed to the environment, and its temperature will be lower than the temperature of the cooking cavity 130. In at least one step of the cooking process, when the temperature T inside the cooking cavity 130... 腔 When the temperature reaches 50℃, for example, around 60℃~80℃, such as T 腔 When the temperature is ≥70℃, the water vapor generated by cooking heating in the cooking cavity 130 flows through the steam channel 172 and through the micropores 161. A significant temperature difference (e.g., exceeding 10℃) exists between the water vapor and the exposed surface 171, causing condensation. Due to the small pore size of the micropores, the condensed water forms a water film adhering to the micropores 161 under surface tension. For example, the water film formed during the heat preservation process can provide a certain degree of sealing to the cooking cavity 130, reducing moisture loss and preventing the food surface from drying out. The sealing effect of the water film also prevents the food from oxidizing too quickly, thus preserving freshness. Water films can also be formed during the low-temperature water absorption process, the first half of the heating process, and the rice-cooking process, achieving the function of sealing and locking in moisture or preserving freshness in the cooking cavity 130.

[0108] In other words, at lower temperatures, when 0.01mm ≤ D1 ≤ 1mm or 0.7 × 10⁻⁶ mm, the optimal temperature range is 0.01mm ≤ D1 ≤ 1mm or 0.7 × 10⁻⁶ mm. -4 mm 2 ≤S1≤100mm 2 In this condition, the steam generated inside the cooking cavity 130 easily forms a water film at the micropores 161, which adheres to the inside of the micropores 161 and can form a certain seal for the cooking cavity 130. This can reduce the loss of moisture inside the pot body 120 and also prevent the food inside the pot body 120 from being oxidized too quickly, thus achieving a preservation effect.

[0109] When the cooking appliance 100 is in the water absorption, heating, steaming, or heat preservation stage, the temperature inside the cooking cavity 130 is approximately 50–70°C. When the water vapor generated inside the cooking cavity 130 passes through the micropores 161, condensation occurs due to the temperature difference, and the condensate adheres to the pores, forming a water film. Under the action of this water film, the pressure inside the cooking cavity 130 can be approximately 350 Pa–400 Pa higher than one standard atmosphere (ambient pressure). In the initial stage of cooking, the cooking appliance 100 is in a heating state, gradually generating water vapor. Initially, the water vapor forms a water film when passing through the micropores 161, creating a certain seal and a slight pressure effect in the cooking cavity 130. As heating continues, the temperature of the cooking cavity 130 increases (the temperature of the steam valve 140 also increases), and the steam pressure increases. The steam will eventually break through the water film and escape from the micropores 161, thus releasing the steam.

[0110] As mentioned above, 0.01mm ≤ D1 ≤ 1mm, for example, D1 can be 0.01mm, 0.05mm, 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, or 1mm. When D1 ≥ 0.01mm, the pore size of the micropore 161 allows air and water vapor to pass through. If D1 > 1mm, it is difficult to form a water film, making it impossible to keep the food moist during the heat preservation stage. Preferably, 0.1mm ≤ D1 ≤ 0.5mm. When the micropore 161 is a circular pore, D1 is the radial dimension of the micropore 161.

[0111] Similarly, in S1≥0.7×10 -4 mm 2 Under these conditions, micropores 161 allow air and water vapor to pass through. When S1 > 0.8 mm 2 At this time, it is difficult to form a water film, making it impossible to keep the food moist during the heat preservation stage. Preferably, when the micropores 161 are centrally symmetrical regular-shaped micropores (e.g., round holes, rectangular holes, regular polygonal holes, elliptical holes, etc.), 7.85×10 -3 mm 2 ≤S1≤0.2mm 2 Alternatively, when the micropore 161 itself has an elongated, slender shape similar to a micropore, 7.85 × 10 -3 mm 2 ≤S1≤50mm 2 When the micropore 161 is elongated in shape, such as an elongated rectangular pore, the maximum length dimension of the micropore 161 can be 100 mm, but the width dimension of the micropore 161 is very small, and the micropore 161 can have a relatively large cross-sectional area.

[0112] This invention does not specifically limit the shape of the micropore 161, as long as it satisfies the requirement of forming a water film at the micropore 161. Those skilled in the art can design the micropore 161 into any shape by referring to the above-described dimensions and area of ​​the micropore.

[0113] Preferably, the wall thickness h of the area of ​​the spacer 169 where the micropores 161 are provided satisfies: 0.15mm ≤ h ≤ 0.3mm. Preferably, the micropores 161 are circular, the pore diameter D1 of the micropores satisfies: 0.2mm ≤ D1 ≤ 0.3mm, and the number of micropores n ≤ 50.

[0114] Please see Figure 7 and Figure 8 The exposed surface 171 is planar, which facilitates manufacturing and prevents the water film from slipping off the spacer 169. It is understood that, to facilitate water film formation, the exposed surface 171 may be provided with a hydrophobic coating; or, the exposed surface 171 (or spacer 169) may be made of a hydrophobic material. When the spacer 169 is provided with a hydrophobic coating and / or the spacer 169 is made of a hydrophobic material, the size of the micropore 161 corresponding to D1 is D1', where D1' > D1. The size of D1' being greater than D1 can be from 0.22 mm to 0.72 mm. It is understood that the hydrophobic coating or hydrophobic material makes it easier for condensate to form droplets and adhere to the micropore 161, therefore the size of the micropore 161 can be relatively slightly larger, making the micropore 161 easier to manufacture. Preferably, the exposed surface 171 is constructed of a metallic material, or in other words, the exposed surface 171 is made of a metallic material. Metals are resistant to high temperatures, and most metals are rust-proof or can be coated with rust-proof coatings, thus making them less prone to damage and ensuring that the water film can form for a long time.

[0115] Because the micropores 161 are small, they are easily clogged, which can affect the steam release function after the food boils. When the amount of steam entering the steam channel 172 is much greater than the amount of steam exiting the steam channel 172, the pressure in the cooking cavity 130 will increase, potentially creating a safety hazard. Therefore, please refer to [the relevant documentation / reference needed]. Figures 5 to 8 The steam valve 140 also includes a pressure relief port 147, which is disposed on the housing assembly 159. The pressure relief port 147 allows the cooking chamber 130 to communicate with the external environment, and its radial dimension is larger than that of the micro-orifice 161. The radial dimension at the narrowest point of the pressure relief port 147 is greater than or equal to 2 mm. Due to its large diameter, the pressure relief port 147 is less prone to clogging. The cooking appliance 100 is configured such that after the food boils, venting can occur through the pressure relief port 147, thus providing double protection for the venting function.

[0116] Specifically, please refer to Figure 5The steam valve 140 also includes a valve structure 186, which has an open state and a closed state. It should be noted that when the valve structure 186 is in the open state, the pressure relief hole 147 is connected to the air intake passage 145; for example, the pressure relief hole 147 is connected to the first steam passage 173, thereby connecting to the air intake passage 145. When the valve structure 186 is in the closed state, the pressure relief hole 147 and the air intake passage 145 are separated; for example, the pressure relief hole 147 is separated from the first steam passage 173, thereby connecting to the air intake passage 145. For example, the pressure relief hole 147 is located outside the first steam passage 173.

[0117] Furthermore, the aforementioned valve structure 186 is configured such that when the pressure it bears (i.e., the steam pressure) is less than a preset pressure P2, the valve structure 186 is in a closed state; when the pressure it bears is greater than or equal to P2, the valve structure 186 is in an open state. Specifically, 0.05 kPa ≤ P2 ≤ 4 kPa. This is because, when P2 < 0.05 kPa, the steam valve 140 can normally exhaust air through the micro-orifice 161, meaning the exhaust capacity of the micro-orifice 161 is sufficient, posing no safety hazard, and the cooking appliance 100 can operate normally without special pressure relief. When P2 > 4 kPa, the cooking appliance 100 poses a significant safety hazard, therefore the pressure in the cooking chamber cannot exceed 4 kPa, and rapid pressure relief is necessary. Preferably, 0.05 kPa ≤ P2 ≤ 1.8 kPa. P2 is the pressure in the cooking chamber 130. Figure 5 In this process, valve structure 186 is installed in the channel wall of the first steam channel 173. The operating mechanism of valve structure 186 will be further described below.

[0118] Please continue reading. Figures 5 to 8 The steam valve 140 also includes a second valve core assembly 160, which is disposed within the housing assembly 159 and forms at least a portion of the channel wall of the first steam passage 173. The second valve core assembly 160 is configured in the assembled position along the first direction DD1 (see [reference]). Figure 8 ) and buoyancy (see Figure 7The second valve core assembly 160 is movable. It is configured to move from the assembled position to the floating position along the first direction DD1 under the action of steam pressure generated in the cooking chamber 130. When in the assembled position, the second valve core assembly 160 blocks the communication between the first steam passage 173 and the pressure relief hole 147; when in the floating position, the first steam passage 173 communicates with the pressure relief hole 147. Preferably, when the lid 110 is closed to the pot body 120, the first direction DD1 is vertical, and the floating position is above the assembled position, allowing the second valve core assembly 160 to move from the floating position to the assembled position by its own weight. The second valve core assembly 160 receives the force of steam from inside the cooking chamber 130; the steam pressure overcomes the weight of the second valve core assembly 160, lifting it up. Preferably, the weight of the second valve core assembly 160 is less than or equal to 20g, so that the interior of the cooking chamber 130 has a safe pressure.

[0119] like Figures 5 to 14 As shown, the housing assembly 159 includes a valve upper cover 141, a valve lower cover 142, and a first valve core assembly 150. The first valve core assembly 150 includes a first valve core body 151, a second sealing ring 152, and a third sealing ring 153. The first valve core assembly 150 is disposed within the valve cavity 190. When the valve upper cover 141 is connected to the valve lower cover 142, the first valve core assembly 150 is confined between the valve upper cover 141 and the valve lower cover 142. The valve lower cover 142 is provided with an air inlet 146 and an air inlet channel 145 for communicating with the cooking cavity 130.

[0120] Specifically, the first valve core body 151 is disposed in the valve cavity 190 formed by the lower valve cover 142 and the upper valve cover 141. The first valve core body 151 is constructed as a hollow annular structure, and the central cavity provides a second steam passage 174 for communication with the cooking cavity 130. The second steam passage 174 is part of the steam passage 172. The second valve core assembly 160 is disposed in the second steam passage 174.

[0121] The axial direction of the first valve core body 151 is the first direction DD1. The opening at the upper end of the cavity of the first valve core body 151 is a first through hole 144. The spacer 169 is exposed to the environment through the first through hole 144. The first valve core body 151 is provided with a pressure relief hole 147, which communicates with the second steam passage 174 and is also connected to the external environment. The top of the valve cover 141 is provided with a cover through hole 199, through which the first through hole 144 and the pressure relief hole 147 are exposed.

[0122] The specific structure of the second valve core assembly 160 is described below.

[0123] The second valve core assembly 160 includes a main body 167 and the aforementioned spacer 169. Specifically, the main body 167 is cylindrical, and its axial direction is a first direction DD1. The main body 167 includes a first end 187 and a second end 188 disposed opposite to each other in the axial direction. An air inlet 146 communicates with the inner cavity of the main body 167, thereby the inner cavity of the main body 167 serves as at least a portion of the first steam passage 173. The outer peripheral edge of the spacer 169 is connected to the second end 188 of the main body and blocks the opening of the second end 188. The spacer 169 is provided with micropores 161. The side of the second valve core assembly 160 opposite to the spacer 169 is used to fit the housing assembly 159. When the side of the second valve core assembly 160 opposite to the spacer 169 is fitted with the housing assembly 159, the pressure relief hole 147 is not in communication with the inner cavity of the main body 167.

[0124] Furthermore, the second valve core assembly 160 also includes a limiting portion 168, which is annular in shape, with its inner peripheral edge connected to the first end 187 of the main body. The housing assembly 159 has a first through hole 144, the axial direction of which is a first direction DD1. At least one portion of the spacer 169 with micropores 161 is exposed to the external environment through the first through hole 144. The main body 167 is adapted to the first through hole 144, for example, the radial dimension of the main body 167 is slightly smaller than the inner diameter of the first through hole 144. At least one portion of the main body 167 near the second end 188 of the main body is located in the first through hole 144, so that the spacer 169 is completely exposed to the external environment through the first through hole 144. The radial dimension of the limiting portion 168 is larger than the inner diameter of the first through hole 144. Therefore, the second valve core assembly 160 will not slip out of the housing assembly 159 from the first through hole 144.

[0125] The second valve core assembly 160 also includes a first sealing ring 163, which is detachably connected to the limiting portion 168. The axial direction of the first sealing ring 163 is the same as the axial direction of the main body 167. At least a portion of the first sealing ring 163 is located on the side of the limiting portion 168 facing away from the spacer 169. Specifically, one of the first sealing ring 163 and the limiting portion 168 is provided with a first groove 164, and the other of the first sealing ring 163 and the limiting portion 168 is provided with a third flange 170, which is received in the first groove 164. In the illustrated embodiment, the first sealing ring 163 is provided with the first groove 164, and the limiting portion 168 is provided with the third flange 170, thereby facilitating the assembly and disassembly / replacement of the first sealing ring 163 and the limiting portion 168.

[0126] Furthermore, the first sealing ring 163 includes a first engaging portion 175 and a first sealing portion 165. The first sealing portion 165 is detachably connected to the limiting portion 168, and is connected to the first engaging portion 175, located on the side of the limiting portion 168 opposite to the spacer 169. The first sealing portion 165 is capable of elastic deformation. The first sealing portion 165 includes a pleated structure 166, which extends along the axial direction of the main body 167 and is concave and convex in the radial direction of the main body 167. For example... Figure 6A and Figure 6B In this structure, the radial dimension of the pleated structure 166 continuously changes along the axial direction. Preferably, the main body 167, the limiting part 168, and the spacer 169 are constructed as an integral component (see...). Figure 15 and Figure 16 This reduces the difficulty of manufacturing the components while ensuring that the components have good structural strength.

[0127] Please see now Figures 6A to 10 Furthermore, the housing assembly 159 has an annular boss 180 inside, the axial direction of which is the aforementioned first direction DD1. The annular boss 180 is located on the lower valve cover 142. The air inlet 146 is located in the area of ​​the housing assembly 159 surrounded by the annular boss 180 (see...). Figure 10 When a first sealing ring 163 is connected at the limiting portion 168, the portion of the first sealing ring 163 located on the side of the limiting portion 168 facing away from the spacer 169 (for example, the first sealing portion 165) is used to contact the annular boss 180 (see...). Figure 5 and Figure 8 That is, the side of the second valve core assembly 160 opposite to the spacer 169 is used to fit the annular boss 180.

[0128] Please see now Figure 5 , Figure 7 and Figure 8When the second valve core assembly 160 is in contact with the annular boss 180, the portion of the second valve core assembly 160, the annular boss 180, and the outer shell assembly 159 surrounded by the annular boss 180 forms the first steam channel 173, that is, the portion of the second valve core assembly 160, the annular boss 180, and the outer shell assembly 159 surrounded by the annular boss 180 forms the channel wall of the first steam channel 173. An air inlet 146 is disposed on the channel wall of the first steam channel 173. After the food is heated, the steam pressure increases, so the second valve core assembly 160 can move from the assembled position to the floating position along the first direction DD1 under the action of the steam pressure generated by the cooking chamber 130. When the second valve core assembly 160 is in the floating position, the first sealing ring 163 leaves the annular boss 180, the channel wall of the first steam channel 173 cracks, allowing the first steam channel 173 to communicate with the pressure relief hole 147. Furthermore, the second valve core assembly 160 partially extends out of the outer shell assembly 159. Specifically, when the second valve core assembly 160 is in the floating position, the spacer 169 and the portion of the main body 167 near the second end 188 of the main body extend from the housing assembly 159 through the first through hole 144. When the second valve core assembly 160 is in the assembled position, the spacer 169 and the main body 167 retract into the first through hole 144. The first through hole 144 guides the movement of the second valve core assembly 160.

[0129] The boiling point of water in the environment where cooking appliances 100 are located is T. 沸 The cooking process of the cooking appliance 100 includes at least one boiling step, during which the temperature T inside the cooking chamber 130 is... 腔 Satisfy: T 腔 =T 沸 +(0~1)℃. Cooking steam within the cooking chamber 130 flows through the steam channel 172 and through several micropores 161 of the spacer 169 to the external environment. During the boiling process, the spacer 169 is driven up and down on the cooking appliance 100 by the steam. Alternatively, the second valve core assembly 160 is driven by the steam and has an upward position. The second valve core assembly 160 can also be located at its assembly position with the cooking appliance 100.

[0130] For example, if insufficient steam pressure keeps the second valve core assembly 160 in the floating position, it can move from the floating position to the assembled position by its own gravity. During the cooking stage, when a water film forms at the micropores 161, the pressure inside the cooking chamber 130 rises, and the second valve core assembly 160 is lifted during the boiling process. After the second valve core assembly 160 is lifted, steam is rapidly discharged from the larger pressure relief hole 147, causing the air pressure in the first steam channel 173 to drop, and the second valve core assembly 160 descends to its original position. This causes the air pressure in the first steam channel 173 to rise again, and the second valve core assembly 160 is lifted again. Therefore, after the food boils, the second valve core assembly 160 cycles through rising and falling motions, creating a dynamic pressure relief effect. When the second valve core assembly 160 is in the assembled position, the inside of the cooking chamber 130 is under low pressure, which can improve the soft and tender texture of the cooked food.

[0131] After the food boils, the steam release from the food in the cooking chamber 130 increases, leading to a rise in steam pressure within the chamber. During this stage, some steam is released to the external environment through several micro-holes 161. To achieve a certain micro-pressure within the cooking chamber 130 at the second valve core assembly 160, the total cross-sectional area of ​​the micro-holes 161 needs to be limited, meaning the micro-holes 161 cannot provide sufficient steam release capacity, thereby creating a certain micro-pressure within the cooking chamber 130 of the cooking appliance 100. For example, the sum of the cross-sectional areas of all the micro-holes 161 is less than 5 mm². 2 Preferably, the sum of the cross-sectional areas of all micropores 161 is less than 3 mm². 2 When the release capacity of the micro-orifice 161 is insufficient, a slight pressure is formed within the cooking chamber 130 due to the appropriate weight of the second valve core assembly 160. This causes the air pressure within the cooking chamber 130 to gradually increase, resulting in the second valve core assembly 160 being pushed up, thus releasing steam through the pressure relief hole 147. Based on this, it is understandable that with the pressure relief hole 147 provided, even if all the micro-orifices 161 are blocked, there is no need to worry about safety hazards caused by steam pressure. At the same time, food can be kept moist during the heat preservation process (the steam pressure during the heat preservation process is insufficient to open the second valve core assembly 160). Therefore, the steam valve 140 may not need to have the micro-orifice 161.

[0132] To ensure that the micropores 161 have an appropriate number (i.e., an appropriate cross-sectional area), the area of ​​the exposed surface 171 exposed to the external environment is S2.3 mm. 2 ≤S2≤8000mm 2 Preferably, 19mm 2 ≤S2≤2000mm 2 . Figure 7 and Figure 8In the figure, the exposed surface 171 is circular, and the diameter of the exposed surface 171 is D2, where 2mm≤D2≤100mm; preferably, 5mm≤D2≤50mm.

[0133] The mechanism by which the steam pressure acts on the second valve core assembly 160 is also the operating mechanism of the aforementioned valve structure 186.

[0134] In the projection of the second valve core assembly 160 along the axial direction of the main body 167, the area enclosed by the outer peripheral edge of the limiting portion 168 is 50 mm. 2 Up to 3000mm 2 This is because the area of ​​the aforementioned region is less than 50 mm. 2 In this case, the effective working area of ​​the steam in the cooking cavity 130 acting on the second valve core assembly 160 is small, and it cannot generate sufficient pressure to open the second valve core assembly 160; in this area, the area is greater than 3000 mm². 2 In this case, the size of the integrated component formed by the main body 167, the limiting part 168, and the spacer 169 is relatively large, which leads to an increase in the size of the outer shell assembly 159, making it difficult to manufacture and increasing manufacturing costs. Therefore, the area enclosed by the outer periphery of the limiting part 168 is 50 mm². 2 Up to 3000mm 2 Under these conditions, while ensuring the overall aesthetics of the cooking appliance 100, the steam has a sufficient effective area, ensuring that the cooking cavity 130 can be connected to the pressure relief hole 147.

[0135] Understandably, if the weight of the second valve core assembly 160 is small, the heating power during the boiling process is high and a large amount of steam is generated, so that even if the steam is discharged from the pressure relief hole 147, the steam pressure may still keep the second valve core assembly 160 in the floating position.

[0136] When steam exits from the pressure relief port 147, it carries foam. To prevent overflow, the steam valve 140 is constructed to maximize the steam flow path, which facilitates foam breaking. For example, a line connecting any point on the wall of the pressure relief port 147 to any point on the periphery of the air inlet 146 can pass through the second valve core assembly 160, meaning the steam must bypass the second valve core assembly 160 to reach the pressure relief port 147. Furthermore, when the second valve core assembly 160 is lifted, the gap between the first sealing ring 163 and the annular boss 180 is not directly aligned with the pressure relief port 147, preventing direct steam injection. For example, the pressure relief port 147 can be located on the outer periphery of the first through hole 144. (See also...) Figure 5In the projection of the steam valve 140 along the first direction DD1, the pressure relief hole 147 is located in the region of the limiting part 168 (the pressure relief hole 147 is located directly above the limiting part 168). Thus, after steam flows out from the gap between the first sealing ring 163 and the annular boss 180, it can only enter the pressure relief hole 147 after bypassing the first sealing ring 163 and the limiting part 168.

[0137] As described above, the second valve core assembly 160 can move between the assembly position and the floating position along the first direction DD1. It should be clarified that the first direction DD1 is a bidirectional direction, the direction from the assembly position to the floating position is the second direction DD2 (e.g., the upward direction), and the direction from the floating position to the assembly position is the third direction DD3 (e.g., the downward direction).

[0138] See appendix Figure 5 It can be seen that the aforementioned micro-hole 161 and cooking cavity 130 are always connected through air intake channel 145; while the opening and closing of pressure relief hole 147 and cooking cavity 130 depends on the force of steam. Imagine a situation where the second valve core assembly 160 is stuck, causing it to firmly press against the annular boss 180 and be unable to move. This would result in the air intake 146 (or air intake channel 145) and pressure relief hole 147 being blocked, with exhaust relying solely on micro-hole 161. If micro-hole 161 is insufficient to balance the internal and external pressure of cooking cavity 130 or is blocked by foreign objects, it would seriously affect the safety of the cooking appliance 100's operation.

[0139] Based on this, to prevent malfunctions, the steam valve 140 further includes at least one first limiting structure 181 disposed in the first steam passage 173. The first limiting structure 181 is used to contact the third-direction DD3 side of the second valve core assembly 160. Specifically, the first limiting structure 181 is used to contact the third-direction DD3 side of the limiting portion 168. The first limiting structure 181 is disposed in the area of ​​the housing assembly 159 surrounded by the annular boss 180. The first limiting structure 181 extends beyond the annular boss 180 in the second direction DD2. The steam valve 140 is configured such that the air inlet 146 communicates with the space between the first limiting structure 181 and the annular boss 180. Under normal circumstances, when the second valve core assembly 160 is in the assembled position, the annular boss 180 supports the second valve core assembly 160, and the first limiting structure 181 may not contact the second valve core assembly 160. However, when the second valve core assembly 160 is subjected to an abnormal external force along the third direction DD3, the first limiting structure 181 can support the second valve core assembly 160, preventing the passive formation of a connection state that is difficult for steam to break through. For example, it ensures that the first sealing ring 163 and the first sealing part 165 are not crushed and still have elastic deformation capability. In this way, even if the second valve core assembly 160 is obstructed and cannot move, the first sealing part 165 can be deformed when the steam pressure is high enough, so that the steam breaks through the channel wall of the first steam channel 173 and is released.

[0140] More specifically, the first limiting structure 181 is used, for example, to support the limiting portion 168. The annular boss 180 and the limiting portion 168 generally share a common central axis P3. In the projection of the steam valve 140 along the first direction DD1, the first limiting structure 181 is distributed on a circle with the central axis as its circle and a radius of the first radius (see...). Figure 10 and Figure 11 The closest distance between the edge of the air inlet 146 and the central axis is less than the first radius, and the maximum distance between the edge of the air inlet 146 and the central axis is greater than the first radius. Thus, a portion of the air inlet 146 is located within the circle of the first limiting structure 181, and a portion is located between the circle of the first limiting structure 181 and the annular boss 180.

[0141] The number of first limiting structures 181 can be one (see...). Figure 11 The first limiting structure 181 extends from both ends of the annular boss 180 in the circumferential direction to the edge of the air inlet 146. Alternatively, there may be multiple first limiting structures 281, with a gap between adjacent first limiting structures 181 (see...). Figure 12 ),Right now Figure 12 The gap 182 in the middle. It can be understood that the first limiting structure 181 can be constructed as a supporting rib.

[0142] In another scenario, if the movement of the second valve core assembly 160 along the first direction DD1 is unrestricted, the second valve core assembly 160 (specifically, the limiting part 168) can move upward to abut against the inner wall of the outer casing assembly 159, thereby sealing the end of the pressure relief hole 147 away from the external environment, preventing steam from entering the pressure relief hole 147, which would undoubtedly also lead to safety issues.

[0143] Therefore, to prevent this malfunction, please refer to [link / reference needed]. Figure 7 , Figure 8 and Figure 14 The steam valve 140 also includes at least one second limiting structure 158 for limiting the upward position of the second valve core assembly 160. The second limiting structure 158 is disposed inside the housing assembly 159 and located on the outer periphery of the main body 167. The second limiting structure 158 extends beyond the pressure relief hole 147 in a third direction DD3. The second limiting structure 158 is used to contact the side of the limiting portion 168 facing the spacer 169. The second valve core assembly 160 can be downwardly limited by the second limiting structure 158 so that the pressure relief hole 147 can remain in communication with the first steam passage. It should be noted that when the second valve core assembly 160 is in the upward position, the side of the second limiting structure 158 contacting the limiting portion 168 facing the spacer 169 (see...). Figure 7 When the second valve core assembly 160 is in the assembled position, the second limiting structure 158 is spaced apart from the limiting portion 168 (see...). Figure 8 ).

[0144] Along the radial direction of the second valve core assembly 160, the pressure relief hole 147 is located between the second limiting structure 158 and the main body 167; or, the second limiting structure 158 is located between the pressure relief hole 147 and the main body 167. Figure 14 In this embodiment, there are multiple second limiting structures 158, with a gap between adjacent second limiting structures 158. Alternatively, in an embodiment not shown, there is only one second limiting structure, which has a notch or through hole; or, there is only one second limiting structure that extends less than one full circle along the circumferential direction of the main body 167. The second limiting structure 158 can be configured as a blocking rib or a protrusion (e.g., a rib or rib sheet). The aforementioned central axis P3 is also the central axis between the main body 167 and the first through hole 144, and the pressure relief hole 147 and the second limiting structure 158 can also be alternately distributed on the circumference with the dot on the central axis P3.

[0145] An inner upper wall 177 is formed in the first valve core body 151, and the second limiting structure 158 is at least one protrusion extending downward from the inner upper wall 177.

[0146] Of course, the second limiting structure 158 can also be configured as a protruding rib provided on the side of the limiting part 168 facing the spacer 169.

[0147] In other words, by setting the first limiting structure 181 and the second limiting structure 158, the second valve core assembly 160 can move a suitable distance relative to the housing assembly 159 along the first direction DD1 to ensure that the pressure relief hole 147 can effectively switch on and off with the cooking cavity 130.

[0148] See Figure 17 The exposed surface 271 is constructed as a convex surface that protrudes towards the external environment relative to the housing assembly 159. With the exposed surface 271 constructed as a convex surface, the water film formed at the micropores 161 can be dispersed from the center outwards along the radial direction of the spacer 269, ensuring that a water film can form in most of the micropores, thus guaranteeing a sealing and moisturizing effect. Alternatively, see... Figure 18 The exposed surface 371 is constructed as a concave surface that is recessed relative to the outer casing assembly 159 toward the first vapor passage 173. When the exposed surface 371 is constructed as a concave surface, the water film formed at the micropores 161 can slide down from the circumferential edge to the center along the radial direction of the spacer 369, so that water films can be formed in most of the micropores, ensuring a sealing and moisturizing effect.

[0149] Alternatively, in a cross-section along the axis of micro-orifice 261, micro-orifice 261 includes a flared structure of varying diameters. For example... Figure 19 In the micropore 261, there are a first part 262 and a second part 263 arranged sequentially and connected to each other along the axial direction of the micropore 261. The first part 262 is constructed as a columnar hole with a uniform diameter, and the second part 263 is constructed such that the radial dimension of the second part 263 is smaller the closer it is to the first part 262. Figure 19 In (a), the first part 262 is located above the second part 263. Figure 19 In (b), the second part 263 is located above the first part 262. Alternatively, in a cross-section along the axis of the microvia 361, the microvia 361 comprises a plurality of columnar holes with inconsistent radial dimensions, arranged along the axial direction of the microvia 361. For example... Figure 20 In the micropore 361, there are a first part 362 and a second part 363 arranged sequentially along the axial direction of the micropore 361. The radial dimension of the first part 362 is smaller than the radial dimension of the second part 363. Figure 20 In (a), the first part 362 is located above the second part 363. Figure 20 In (b), the second part 363 is located above the first part 362.

[0150] In similar Figure 19 and Figure 20In embodiments where the pore diameter is inconsistent along the axial direction, the aforementioned limitation on the size of the micropore 161 specifically refers to the narrowest point of the pore diameter, because the water film forms at the narrowest point of the pore diameter.

[0151] Alternatively, see Figure 21 The spacer 269 includes a connecting portion 189 and a mesh plate 184. The outer peripheral edge of the connecting portion 189 is connected to the second end 188 of the main body (in other embodiments, the outer peripheral edge of the connecting portion 189 may be connected to other components of the cooking appliance), and a first opening 183 is provided at the center of the connecting portion 189, extending through the connecting portion 189 in the axial direction of the main body 167. The mesh plate 184 is disposed at and covers the first opening 183, and the micro-holes 161 are the mesh openings of the mesh plate 184. The portion of the spacer 169 with at least the micro-holes 161 is made of a metal material. For example, the aforementioned exposed surface 171, or the mesh plate 184, is made of a metal material. It can also be understood that the spacer can be a single component or an assembly. When the pore size of micropore 161 is as small as micrometers (e.g., waterproof and breathable: 0.1um to 10um), micropore 161 has the following properties: (1) Waterproof performance: its pore size must be much smaller than the diameter of water droplets (the diameter of water droplets is usually greater than 100 micrometers) to ensure that liquid water cannot penetrate micropore 161; (2) Breathable performance: the pore size of micropore 161 is larger than the diameter of water vapor molecules (about 0.4 nanometers), and micropore 161 allows air and moisture to pass through, which can maintain air pressure balance; (3) Dustproof performance: some materials can capture micro dust particles of 0.1 micrometers, and the protection level can reach IP67 or higher.

[0152] In this invention, after cooking has been in progress for a period of time, the micropore area of ​​the second valve core assembly 160 is sealed by condensate and no longer releases gas. At this time, the micropore 161 only serves a display function. The second valve core assembly 160 will float up and down in a cycle as the pressure chamber in the cooking cavity 130 changes, which can create a dynamic effect.

[0153] Based on the invention's concept, the inventors' tests revealed that when the aperture D1 of the micropores 161 is greater than 0.5 mm and the number n is greater than 50, almost all the steam generated in the cooking chamber (test conditions: cooking chamber volume 4L; heating power 1000-1500W) can be discharged to the outside through the micropores, making it difficult to form a large air pressure in the cooking chamber, and the second valve core assembly 160 will hardly float. Therefore, preferably, the aperture D1 of the micropores 161 satisfies: 0.1 mm ≤ D1 ≤ 0.5 mm; more preferably, the aperture D1 of the micropores 161 satisfies: 0.2 mm ≤ D1 ≤ 0.3 mm; and preferably, the number n of the micropores 161 is ≤ 50.

[0154] The specific analysis process is as follows:

[0155] During the boiling process, the steam pressure inside the cooking chamber is F. 蒸汽The pressure is P 蒸汽 G is the weight of the second valve core assembly 160; Ф1 is the diameter of the contact surface of the steam acting on the second valve core assembly 160 (basically the diameter of the outer periphery of the limiting part 168); Ф3 is the diameter of the micropore 161; n is the number of micropores 161.

[0156] The effective working area of ​​steam acting on the second valve core assembly 160 is S:

[0157] S = π(Ф1 / 2) 2 -n×π(Ф3 / 2) 2 .

[0158] F 蒸汽 =P 蒸汽 ×S, for safety reasons, P 蒸汽 ≤4kPa.

[0159] When Ф3>0.5mm and n>50, the total cross-sectional area of ​​all micropores 161 is relatively large (the total steam exhaust capacity of the micropores is strong, and all the steam generated in the cooking cavity can be discharged through the micropores), while the effective area S is relatively small, and F 蒸汽 It is also correspondingly smaller, F 蒸汽 ≤G, the second valve core assembly 160 will hardly float; when Ф3≤0.5mm, n≤50, the total cross-sectional area of ​​all micropores 161 is small (the steam generated in the cooking cavity cannot escape from the micropores in time), and the effective area S is relatively large, F 蒸汽 It is also correspondingly larger, F 蒸汽 If >G, the second valve core assembly 160 will be lifted, at which point steam can be discharged from the pressure relief hole 147, achieving a dynamic effect.

[0160] The above experimental process can be achieved through Figure 22 The pressure-temperature curves illustrate this. In the experiment, the pore size was 0.1mm ≤ Ф3 ≤ 0.5mm, the number of micropores was 50, and the weight of the second valve core assembly 160 was 20g. The curves show that during the water absorption and heating stages, when the water temperature is 50–60℃, the water vapor generated in the cooking cavity 130 passes through the micropores 161 and condenses due to the temperature difference. This condensate adheres to the pores, forming a water film. The maximum pressure this water film can withstand is approximately 383Pa. The pressure during the heat preservation stage when the water film seals is the same as during the water absorption and heating stages. During the boiling stage, the maximum pressure inside the cooking cavity 130 is approximately 1.6kPa.

[0161] The inventors have confirmed through multiple experiments that, preferably, during the boiling process, the pressure value P_cavity within the cooking cavity 130 satisfies: 0.05 kPa ≤ P_cavity. 腔 ≤1.8kPa, more preferably, 0.6kPa≤P 腔 ≤1.6kPa.

[0162] One standard atmosphere is approximately 100 kPa. The pressure value inside the cooking cavity 130 is the actual pressure value minus one standard atmosphere, which is also the positive pressure value that is higher than the ambient air pressure.

[0163] See Figure 23 and Figure 24 The steam valve 140 may also include an elastic member 185. The elastic member 185 is disposed between the housing assembly 159 and the second valve core assembly 160, with its two ends connected to the housing assembly 159 and the second valve core assembly 160 (specifically, the limiting portion 168), respectively. The elastic member 185 applies a force to the second valve core assembly 160 to move it toward the assembly position. Therefore, on one hand, the elastic member 185 can be used to regulate the steam pressure inside the cooking cavity 130. This is because if the weight of the second valve core assembly 160 is too small relative to the steam pressure inside the cooking cavity 130, the elastic member 185 can exert a certain pressing force on the second valve core assembly 160, requiring the steam pressure to overcome the elastic force of the elastic member 185 and the weight (or gravity) of the second valve core assembly 160, so that the second valve core assembly 160 moves from the assembly position to the floating position. On the other hand, the elastic member 185 facilitates the reset of the second valve core assembly 160, which helps the second valve core assembly 160 return to the assembled position when the movement of the second valve core assembly 160 is obstructed. Figure 23 In the middle, the elastic member 185 is constructed as a spring; alternatively, please refer to [reference needed]. Figure 24 The elastic member 285 can be constructed as a flexible elastic member, such as a stretchable silicone member.

[0164] Please see Figure 25 and Figure 26 The housing assembly 159 includes an inner upper wall 177 located on the side of the limiting portion 168 facing the spacer 169. Both the first through hole 144 and the pressure relief hole 147 are disposed on the inner upper wall 177. The first engagement portion 175 of the first sealing ring 163 is fitted onto the outer periphery of the limiting portion 168, such that a portion of the first engagement portion 175 protrudes above the limiting portion 168. When the second valve core assembly 160 moves upward, the first engagement portion 175 contacts the inner upper wall 177 more easily than the limiting portion 168, thus preventing steam from entering the pressure relief hole 147. For this purpose, at least one first groove 258 is also formed on the inner surface of the inner upper wall 177, extending radially along the main body 167 and located on the outer periphery of the first through hole 144. It should be noted that in the projection of the steam valve 140 along the first direction DD1, the end of the first groove 258 near the first through hole 144 is located on the inner circumferential side of the first joint 175, and the end of the first groove 258 away from the first through hole 144 is located on the outer circumferential side of the first joint 175. Figure 26In the middle, there are multiple first grooves 258, and the multiple first grooves 258 are evenly distributed along the circumferential direction of the main body 167.

[0165] An inner upper wall 177 is formed in the first valve core body 251. A first groove 258 is provided in the first valve core body 251.

[0166] See Figure 27 The side of the limiting part 168 facing away from the spacer 169 is directly used to contact the annular boss 180, meaning that the second valve core assembly 160 may not need to be equipped with the first sealing ring 163. When both the limiting part 168 and the annular boss 180 are hard, relatively smooth surfaces, the sealing formed by their direct contact can also meet the cooking requirements.

[0167] As mentioned earlier when introducing the second limiting structure 158, when the steam pressure is high enough, the valve structure can be opened by the elastic deformation of the first sealing part. Figure 28 In this embodiment, compared to the aforementioned first sealing ring 163, the first sealing portion 465 of the first sealing ring 463 has an increased axial dimension (or an increased pleated structure). When the first sealing portion 465 does not undergo elastic deformation, it forms part of the cavity wall of the first steam passage 173. When the first sealing portion 465 undergoes elastic deformation, a gap is formed between the first sealing portion 465 and the cavity wall of the first steam passage 173, allowing the first steam passage 173 to communicate with the pressure relief hole 147. In this embodiment, the second valve core assembly 160 can be fixed in the housing assembly 159 without movement. During the boiling process, the second valve core assembly 160 remains in its assembled position with the cooking appliance 100. Those skilled in the art can design the elastic deformation capability of the first sealing portion 465 according to the range of safe gas pressure values.

[0168] Please see Figure 29 and Figure 30 The steam valve 240 eliminates the aforementioned second valve core assembly 160 and pressure relief hole 147. For example, the steam valve 240 includes an upper cover 241 and a lower cover 242, which enclose a valve cavity 191, also known as a steam passage 172. Several micro-holes 161 are directly provided on the upper cover 241, and the lower cover 242 has an air inlet 146 communicating with the cooking cavity 130. Alternatively, the aforementioned mesh plate can be installed on the upper cover 241, with the micro-holes located on the mesh plate. The mesh plate and the upper cover 214 can be assembled using a secondary injection molding process or other assembly processes. In this embodiment, the total cross-sectional area of ​​the micro-holes 161 is sufficiently large (e.g., greater than 5 mm). 2It has a sufficiently large steam exhaust capacity. At relatively low temperatures, water vapor can form a water film in the micropores 161, which can reduce moisture loss inside the pot, solve the problem of food surface drying, and prevent food inside the pot 120 from being oxidized too quickly, thus achieving a preservation effect. When the food boils, the micropores 161 are used to exhaust steam and balance the internal and external air pressure.

[0169] See Figure 31 In the steam valve 340, the valve structure 486 can be installed on the channel wall of the air inlet channel 145, thus eliminating the need for the valve structure 186 on the channel wall of the first steam channel 173. This is understandable. Figure 31 When the steam pressure is greater than or equal to the preset pressure P2, the valve structure 486 (e.g., a gravity ball, gravity float, etc.) floats upward, and the valve opens, so that the air intake channel 145 is connected to the pressure relief hole 147; when the steam pressure is less than P2, the valve structure 486 falls back to the initial position due to its own gravity, and the valve closes, so that the air intake channel 145 is not connected to the pressure relief hole 147.

[0170] In embodiments not shown in this utility model, the lid or cooking appliance does not have a detachable steam valve (this can also be understood as the steam valve being fixed and non-detachable), meaning its steam passage is integrally formed inside the lid or cooking appliance and is not detachable. A spacer is detachably or fixedly located at the outlet of the steam passage of the lid or cooking appliance that communicates with the outside. Alternatively, the steam valve is detachably connected to the lid or cooking appliance, and the spacer is located on the steam valve, thus being detachably connected to the lid or cooking appliance along with the steam valve. The spacer may also be detachably located on the steam valve.

[0171] The following explains the valve structures other than valve structure 486.

[0172] Figure 5 In this context, the second valve core assembly 160 is the aforementioned valve structure 186. Figure 28 In the first sealing ring 463, the first sealing part 465 is the valve structure 286. Figure 27 In the middle, valve structure 386 is located at the second valve core assembly 160, and... Figure 5 similar.

[0173] The specific structure of the housing assembly 159 of the steam valve 140 is described below.

[0174] Please see now Figures 5 to 14 As previously described, the housing assembly 159 includes a valve upper cover 141, a valve lower cover 142, and a first valve core assembly 150. The first valve core assembly 150 includes a first valve core body 151, a second sealing ring 152, and a third sealing ring 153.

[0175] The second sealing ring 152 is disposed between the upper valve cover 141 and the first valve core body 151. The third sealing ring 153 is disposed between the lower valve cover 142 and the first valve core body 151. Thus, the upper valve cover 141 and the lower valve cover 142 form the first outer shell of the steam valve 140, and the first valve core body 151 forms the second outer shell of the steam valve 140. The double-layer shell is more conducive to ensuring the sealing of the steam valve.

[0176] Furthermore, one of the valve upper cover 141 and the valve lower cover 142 is provided with a second groove 148, and the other of the valve upper cover 141 and the valve lower cover 142 is provided with a first flange 149, which is accommodated in the second groove 148. Figure 6B In the middle, the upper valve cover 141 is provided with a second groove 148, and the lower valve cover 142 is provided with a first flange 149.

[0177] Furthermore, the second sealing ring 152 is detachably connected to the first valve core body 151, and the axial direction of the second sealing ring 152 is the same as the axial direction of the first valve core body 151. Specifically, at least one of the inner surface of the valve cover 141 and the outer surface of the first valve core body 151 is provided with a first receiving groove 154 for accommodating the second sealing ring 152. In the illustrated embodiment, the first receiving groove 154 is provided on the outer surface of the first valve core body 151. The axial direction of the aforementioned annular structure (of the first valve core body 151) is vertical, and the first receiving groove 154 is constructed to be recessed downward along the axial direction of the first valve core body 151, and the second sealing ring 152 is accommodated in the first receiving groove 154. In the assembled state of the steam valve 140, the second sealing ring 152 is sandwiched between the valve cover 141 and the first receiving groove 154. The inner surface of the valve cover 141 is provided with a downward protruding rib 136. When the steam valve 140 is assembled, the second sealing ring 152 is sandwiched between the rib 136 and the first receiving groove 154.

[0178] A third sealing ring 153 is detachably connected to a first valve core body 151, and the axial direction of the third sealing ring 153 is the same as that of the first valve core body 151. At least a portion of the third sealing ring 153 is located on the side of the first valve core body 151 facing the lower valve cover 142. One of the first valve core body 151 and the third sealing ring 153 is provided with a second receiving groove 155, and the other of the first valve core body 151 and the third sealing ring 153 is provided with a second flange 156, which is received in the second receiving groove 155. In the illustrated embodiment, the third sealing ring 153 is provided in the second receiving groove 155, and the first valve core body 151 is provided with the second flange 156; in the assembled state of the steam valve 140, a portion of the groove wall of the second receiving groove 155 is sandwiched between the second flange 156 and the lower valve cover 142. The second flange 156 is disposed on the outer peripheral surface of the first valve core body 151. In the assembled state of the steam valve 140, the lower side of the groove wall of the second receiving groove 155 is sandwiched between the second flange 156 and the valve lower cover 142.

[0179] See Figures 5 to 6B In the first embodiment, the steam valve 140 includes an upper valve cover 141, a lower valve cover 142, a first valve core assembly 140, and a second valve core assembly 160. Preferably, the steam valve 140 is essentially a rotating body structure with a central axis P3 as its axis. Preferably, the first valve core assembly 140 and the second valve core assembly 160 are rotating bodies with a central axis P3 as their axis.

[0180] The second valve core assembly 160 is disposed within the inner cavity of the first valve core body 151, meaning the first valve core assembly 150 is located on the outer periphery of the second valve core assembly 160. The portion of the valve cavity 190 located between the second valve core assembly 160 and the first valve core assembly 150 forms a second steam passage 174. The second steam passage 174 is located on the outer periphery of the first steam passage 173. The valve structure controls the opening and closing of the first steam passage 173 and the second steam passage 174. When the second valve core assembly 160 is in the floating position, the second steam passage 174 connects to the first steam passage 173. When the second valve core assembly 160 is in the assembled position, the second steam passage 174 is separated from the first steam passage 173.

[0181] The lower valve cover 142 is connected to the second valve core assembly 160, forming a first steam passage 173 between them, which is part of the steam passage 172. A spacer 169 is detachably or integrally disposed on the second valve core assembly 160 and is located between the first steam passage 173 and the external environment when the lower valve cover 142 and the second valve core assembly 160 are assembled. The second valve core assembly 160 has an upward floating position separate from the lower valve cover 142. The second valve core assembly 160 also has an assembled position in contact with the lower valve cover 142.

[0182] The spacer 169, the main body 167, and the limiting part 168 constitute the second valve core component 162 (see...). Figure 15 and Figure 16 The second valve core component 162 can be a one-piece metal part. The second valve core assembly 160 includes the second valve core component 162 and the first sealing ring 163. The second valve core component 162 is generally in the shape of an inverted cup, so that the second valve core assembly 160 is generally in the shape of an inverted cup.

[0183] The second valve core assembly 160 has a second lower circumferential edge 192, and the lower valve cover 142 has a lower cover inner bottom 193. The second lower circumferential edge 192 is used to contact the lower cover inner bottom 193. The second lower circumferential edge 192 may be the lower circumferential edge of the second valve core member 162, wherein the limiting portion 168 provides the lower circumferential edge of the second valve core member 162. An elastic seal (e.g., a first sealing ring 163) is provided between the second lower circumferential edge 192 and the lower cover inner bottom 193. An annular boss 180 is provided in the lower cover inner bottom 193, and the second lower circumferential edge 192 is used to contact the annular boss 180. An elastic seal is provided between the second lower circumferential edge 192 and the annular boss 180. The lower cover inner bottom 193 also has a first limiting structure 181 protruding toward the second valve core assembly 160.

[0184] The first valve core assembly 150 has a first lower circumferential edge 191, which is located on the outer periphery of a second lower circumferential edge 192, and there is a distance between them. Therefore, the second valve core assembly 160 is not obstructed by the first valve core assembly 150 during its vertical movement. The outer periphery of the annular boss 180 abuts against the inner periphery of the first lower circumferential edge 191. The first lower circumferential edge 191 may be the lower edge of the first valve core body 151. A third sealing ring 153 is connected to the lower edge of the first valve core body 151. The first lower circumferential edge 191 may also be composed of the third sealing ring 153. Alternatively, the first lower circumferential edge 191 may be composed of the third sealing ring 153 and the lower edge of the first valve core body 151.

[0185] The approximate path of steam flowing from the cooking chamber 130 to the micropore 161 is: cooking chamber 130 - exhaust channel 132 - air intake channel 145 - air inlet 146 - first steam channel 173 - micropore 161. That is, under normal circumstances, the micropore 161 and the cooking chamber 130 are in constant communication. When the pressure relief hole 147 is connected to the cooking chamber 130, the approximate path of steam flowing from the cooking chamber 130 to the pressure relief hole 147 is: cooking chamber 130 - exhaust channel 132 - air intake channel 145 - air inlet 146 - first steam channel 173 - second steam channel 174 - pressure relief hole 147.

[0186] The second valve core assembly 160 is disposed in the second steam passage 174. The second valve core assembly 160 is configured to move from the assembled position to the floating position under the action of steam generated in the cooking chamber 130 (of course, the switching between the assembled position and the floating position can also be achieved by the elastic deformation of the first sealing ring). When the second valve core assembly 160 is in the assembled position, it and the lower valve cover 142 form a first steam passage 173 that communicates with the air inlet 146 and blocks the communication between the air inlet 146 and the pressure relief hole 147; when the second valve core assembly 160 is in the floating position, the air inlet 146 communicates with the pressure relief hole 147. It is understood that when the second valve core assembly 160 is in the floating position, the second steam channel 174 connects the pressure relief hole 147 and the cooking chamber 130. The steam inside the cooking chamber 130 is distributed along the flow path of the second steam channel 174 on both sides of the limiting portion 168 in the axial direction (first direction DD1) of the second valve core assembly 160. Compared to steam being directly injected from the cooking chamber 130 to the pressure relief hole 147, this extends the steam flow path and prevents food from overflowing from the pressure relief hole 147. This is because, along the first direction, the second valve core assembly 160 is partially (e.g., the limiting portion 168) located between the air inlet 146 and the pressure relief hole 147. When the second valve core assembly 160 is in the floating position, the steam inside the cooking chamber 130 must flow from the air inlet 146 around the second valve core assembly 160 to the pressure relief hole 147.

[0187] The aforementioned shape and structure of the exposed surface 171 can also be described as follows: the portion of the second valve core assembly 160 with at least the micropores 161 is planar (see...). Figure 15 and Figure 16 Alternatively, at least the portion of the second valve core assembly 160 provided with micropores 161 is configured as a convex surface protruding towards the external environment relative to the valve cover 141 (see...). Figure 17 Alternatively, the portion of the second valve core assembly 160 at least provided with micropores 161 is configured as a concave surface recessed relative to the upper valve cover 141 toward the lower valve cover 142 (see...). Figure 18 The aforementioned concave and convex surfaces can be curved surfaces or other suitable curved surface structures. The shape of the exposed surface 171 is designed by the design engineer according to the product design requirements, and can be a plane, a curved surface, or an irregular surface, etc.

[0188] The first steam passage 173 and the second steam passage 174 are both part of the valve cavity 190. The direction extending from the central axis of the steam valve towards the periphery perpendicular to the central axis is called "outside," and vice versa. The steam passage 172 connects the cooking cavity 130 of the cooking appliance 100 with the steam flow channel of the external environment; this invention does not limit its specific form or structure. The steam passage 172 can be directly installed in the cooking appliance 100, or it can be formed in or installed in the cover 110. When the cooking appliance 100 is equipped with a steam valve, the first steam passage 173 formed within the steam valve is part of the steam passage 172. In other words, the cooking appliance 100 includes a cooking cavity 130, a steam passage 172 communicating with the cooking cavity 130, and the aforementioned spacer, the spacer being detachably or fixedly disposed in the cooking appliance 100; or, the cooking appliance 100 includes a cooking cavity 130 and the aforementioned steam valve, the steam valve being detachably or fixedly disposed in the cooking appliance 100; or, the cooking appliance 100 includes a cooking cavity 130 and the aforementioned cover 110.

[0189] The steam valve of this utility model can be used not only in electric cooking appliances, but also in open flame products, such as open flame steamers and open flame pressure cookers.

[0190] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of the invention. Terms such as “set” appearing herein can refer to either a component being directly attached to another component or a component being attached to another component via an intermediary. A feature described in one embodiment may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0191] This utility model has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this utility model to the described embodiments. Those skilled in the art will understand that many more variations and modifications can be made based on the teachings of this utility model, and all such variations and modifications fall within the scope of protection claimed by this utility model.

Claims

1. A spacer for a cooking appliance or a steam valve for a cooking appliance, the cooking appliance including a cooking chamber, the cooking appliance or the steam valve being provided with a steam passage communicating with the cooking chamber, characterized in that, The spacer is disposed between the steam channel and the external environment and has an exposed surface exposed to the external environment. At least a portion of the exposed surface has a plurality of micropores communicating between the steam channel and the external environment. On the surface of the exposed surface, the micropores have a length dimension and a width dimension, wherein the width dimension is D1, 0.01mm≤D1≤1mm, or the cross-sectional area of ​​the micropore is S1, 0.7×10⁻⁶. -4 mm 2 ≤S1≤100mm 2 .

2. The spacer according to claim 1, characterized in that, 0.1mm≤D1≤0.5mm; or, When the micropores are centrally symmetrical, regularly shaped micropores, 7.85 × 10 -3 mm 2 ≤S1≤0.2mm 2 ;or, When the micropore itself has an elongated shape, similar to a micropore, 7.85 × 10 -3 mm 2 ≤S1≤50mm 2 .

3. The spacer according to claim 1, characterized in that, The micropores on the exposed surface can be circular, elliptical, polygonal, rectangular, fan-shaped, or S-shaped.

4. The spacer according to claim 1, characterized in that, On a cross-section passing through the axis of the micropore: The micropore structure is a columnar pore of uniform thickness; or The micropores include multiple columnar pores with inconsistent radial dimensions, and the multiple columnar pores are arranged along the axial direction of the micropores; or The micropores include a funnel-shaped structure with varying diameters.

5. The spacer according to claim 1, characterized in that, The exposed surface is planar; or... The exposed surface is constructed as a convex surface that protrudes towards the external environment relative to the steam passage; or, The exposed surface is constructed as a concave surface that is recessed relative to the external environment and faces the steam passage.

6. The spacer according to claim 1, characterized in that, The wall thickness h of the perforated region of the spacer is 0.15 mm ≤ h ≤ 0.3 mm; and / or, The micropores are circular, with a diameter of 0.2 mm to 0.3 mm, and the number of micropores is less than or equal to 50.

7. The spacer according to claim 1, characterized in that, The area of ​​the exposed surface exposed to the external environment is S2, 3 mm. 2 ≤S2≤8000mm 2 .

8. The spacer according to claim 7, characterized in that, 19mm 2 ≤S2≤2000mm 2 。 9. The spacer according to claim 7, characterized in that, The exposed surface is circular, and the diameter of the exposed surface is D2, where 2mm ≤ D2 ≤ 100mm.

10. The spacer according to claim 9, characterized in that, 5mm≤D2≤50mm.

11. The spacer according to claim 1, characterized in that, The exposed surface is made of metal; and / or The spacer is provided with a hydrophobic coating or the spacer is made of a hydrophobic material.

12. The spacer according to claim 1, characterized in that, When the spacer is provided with a hydrophobic coating and / or the spacer is made of a hydrophobic material, the size of the micropore corresponding to D1 is D1', and the size of D1' is greater than that of D1 by 0.22 mm to 0.72 mm.

13. The spacer according to any one of claims 1 to 12, characterized in that, The spacer is constructed as a single component; or... The spacer includes a connecting part and a mesh plate, the mesh plate being disposed at the center of the connecting part, the micropores being the mesh openings of the mesh plate, and the connecting part being used to connect to the cooking appliance.

14. A steam valve for a cooking appliance, characterized in that, The steam valve has an internal steam passage for communicating with the cooking chamber of the cooking appliance. The steam valve can be detachably or fixedly connected to the cooking appliance. The steam valve includes a spacer according to any one of claims 1 to 13, the spacer being detachably or fixedly disposed between the steam passage and the external environment.

15. A lid for a cooking utensil, characterized in that, The lid has a steam passage inside, which communicates with the cooking cavity of the cooking appliance. The cover includes a spacer according to any one of claims 1 to 13, the spacer being detachably or fixedly disposed between the steam passage and the external environment; or, the cover includes a steam valve according to claim 14, the steam valve being detachably or fixedly disposed on the cover.

16. A cooking utensil, characterized in that, The cooking appliance includes: a cooking cavity, a steam passage communicating with the cooking cavity, and a spacer according to any one of claims 1 to 13, the spacer being detachably or fixedly disposed in the cooking appliance; or The cooking appliance includes: a cooking chamber and a steam valve according to claim 14, the steam valve being detachably or fixedly disposed in the cooking appliance; or The cooking appliance includes a cooking cavity and a cover according to claim 15.

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