Anti-overflow inner cover of a cooking appliance

Abstract

The utility model relates to the technical field of cooking utensil discloses a kind of anti-overflow inner cover of cooking utensil, including inner cover body, and anti-overflow part is equipped on inner cover body, and anti-overflow part includes the boss projecting towards first direction and is equipped with liquid storage groove in the periphery of boss, and exhaust port is equipped on boss, and the bottom of liquid storage groove is equipped with several backflow holes, and the cross-sectional area of exhaust port is greater than the sum of the cross-sectional area of all backflow holes.The anti-overflow inner cover uses single-layer anti-overflow structure, and the structure is simple and can guide gas-liquid directional flow, and the anti-overflow effect is good, and it is convenient to clean.

Description

Technical Field

[0001] This utility model relates to the field of cooking utensil technology, and in particular to an anti-overflow inner cover for a cooking utensil. Background Technology

[0002] During cooking, rice porridge or soup boils under high temperature and pressure, easily overflowing from the steam valve or gaps in the inner lid. Currently, overflow prevention is achieved by designing multiple physical barriers on the rice cooker lid. For example, Chinese patent application CN217937894U discloses an overflow-prevention lid for a pressure cooker. The inner and outer lid assemblies form an overflow-prevention chamber, with a guide cover between the outer and inner lid assemblies. This guide cover separates the overflow-prevention chamber into a primary and a secondary overflow-prevention chamber. The inner lid has a primary bubble-breaking hole connecting the cooking chamber and the primary overflow-prevention chamber, while the guide cover has a secondary bubble-breaking hole connecting both chambers. When bubbles in the cooking chamber enter the primary overflow-prevention chamber through the primary bubble-breaking hole, some are squeezed or collide with the guide cover and burst. Residual bubbles enter the secondary overflow-prevention chamber through the secondary bubble-breaking hole and collide with the outer lid assembly and the exhaust pipe, bursting. The liquid then flows back into the cooking chamber through the guide channel and return hole, thus preventing overflow. However, in the above solution, steam and liquid enter the overflow prevention chamber through the bubble-breaking holes. Rice paste and liquid accumulated after the bubbles burst during cooking will flow freely in the overflow prevention chamber, resulting in a large area of ​​stain adhesion. In addition, the multi-stage bubble-breaking structure and the flow guiding structure can easily form cleaning dead corners, increasing the difficulty of cleaning. Utility Model Content

[0003] To address the technical problem of the difficulty in cleaning the aforementioned anti-overflow structure, this utility model provides an anti-overflow inner cover for cooking utensils, which has a simple structure and can guide the directional flow of gas and liquid, making it easy to clean.

[0004] The specific technical solution of this utility model is as follows: an anti-overflow inner cover for a cooking utensil, including an inner cover body, an anti-overflow part on the inner cover body, the anti-overflow part including a boss protruding in a first direction and a liquid storage tank located around the boss, an exhaust port on the boss, and a plurality of return holes at the bottom of the liquid storage tank, the cross-sectional area of ​​the exhaust port being greater than the sum of the cross-sectional areas of all the return holes.

[0005] In the aforementioned overflow-proof inner cover, during high-pressure cooking, a local low-pressure zone is formed around the raised area. The vent, with its larger cross-sectional area, forms a low-resistance channel. At this time, due to the pressure difference, steam and liquid are preferentially discharged from the vent. The liquid is collected by the lower liquid storage tank and returns to the pot through the return hole, achieving directional flow of gas and liquid. When the overflow volume is large, the vent and return hole work together to discharge the liquid. The side wall of the liquid storage tank confines the liquid within the tank. As the discharge process progresses, the pressure at the return hole gradually becomes less than the gravity of the returning liquid, and the liquid in the storage tank flows back to the pot through the return hole. This achieves dynamic regulation of gas and liquid flow, achieving a balance between efficient pressure relief and overflow prevention. In this design, a single-layer overflow-proof structure is used, with the liquid storage tank serving as the core overflow-proof area. It concentrates and confines the overflow within its recessed space, reducing the area of ​​residue. Furthermore, the large-diameter design of the vent reduces the risk of blockage by sticky stains, facilitating cleaning.

[0006] Optionally, several reflux holes are arranged circumferentially around the boss.

[0007] In the above technical solution, the structure allows the liquid in the storage tank to flow evenly into the return hole from multiple directions, avoiding the situation where local liquid accumulation cannot be returned in time due to the concentration of hole positions, thereby further improving the efficiency and uniformity of liquid guiding back to the pot body.

[0008] Optionally, the bottom of the liquid storage tank has a higher end away from the boss than the end near the boss, and the two ends form a continuous slope. The reflux hole is located near the inclined end.

[0009] In the above technical solution, the slope of the inclined surface can guide the liquid flow to the return hole, improve the return efficiency, and reduce liquid residue.

[0010] Optionally, the sidewall of the liquid storage tank gradually slopes away from the boss from bottom to top.

[0011] In the above technical solution, compared with the vertical sidewall, the inclined sidewall not only extends the path of liquid overflow, requiring the liquid to flow a longer distance along the inclined surface before overflowing, but also forms a guide slope by means of the inclined angle. When the liquid splashes onto the sidewall, it will slide down the inclined surface and fall back into the liquid storage tank, thereby effectively reducing the risk of overflow.

[0012] Optionally, the inner cover body is further provided with a recessed groove that is recessed away from the first direction, and an overflow prevention part is provided in the recessed groove. The recessed groove includes a first groove and a second groove that continues to be recessed away from the bottom of the first groove in the first direction. A boss is located in the second groove, and the annular space between the second groove and the boss serves as a liquid storage tank.

[0013] In the above technical solution, the inner cover body, the first groove, and the liquid storage tank are arranged in a stepped manner from high to low. The first groove serves as the second line of defense. When liquid overflows from the liquid storage tank, it will fall into the first groove to prevent it from spreading outward, thus greatly reducing the spread range of the liquid and clearly defining the concentrated area of ​​stains, making it easy to clean.

[0014] Optionally, the exhaust port is located at the top of the boss, the top surface of the boss is smaller than the bottom surface, and the top surface and the bottom surface form a continuous inclined surface.

[0015] In the above technical solution, the exhaust port is located in the airflow path, resulting in high exhaust efficiency. The height of the boss places the exhaust port at a relatively high position, which can utilize the height difference to prevent liquid from entering the exhaust channel in reverse and effectively avoid interference from backflowing liquid on the exhaust function. The boss has a sloping structure that is smaller at the top and larger at the bottom, which can naturally guide the steam rising from the pot body, allowing the steam to converge more smoothly along the slope to the exhaust port at the top, reducing the retention and condensation of steam on the side of the boss. At the same time, when liquid splashes onto the surface of the boss, the slope can guide the liquid along the slope to the liquid storage tank around the boss with the help of gravity, reducing liquid residue at the top of the boss and improving liquid recovery efficiency.

[0016] Optionally, the exhaust port is provided with an anti-overflow component, which divides the exhaust port into several openings.

[0017] In the above technical solution, when rice paste or other liquids rush towards the exhaust port with air pressure, part of it will be directly blocked by the solid part of the anti-overflow component, and the impact speed of the other part will be slowed down, reducing splashing.

[0018] Optionally, the total area of ​​several openings accounts for 60%-80% of the top area of ​​the boss.

[0019] In the above technical solution, when the total area of ​​several openings is less than 60% of the top area of ​​the boss, the effective exhaust area is insufficient, the gas flow resistance is large, and the pressure accumulates, which will aggravate the overflow of rice paste; if the proportion exceeds 80%, the anti-overflow component structure is not strong enough, it is difficult to withstand the impact of gas and liquid, and it is easy to deform and break.

[0020] Optionally, the edge of the opening has an arc-shaped structure.

[0021] In the above technical solution, the arc-shaped opening can reduce liquid residue and cleaning dead corners.

[0022] Optionally, the inner cover body and the spill prevention part are integrally formed.

[0023] Compared to the structure where the inner cover body and the spill prevention part are separately set and then connected, the one-piece molded structure does not require additional connecting components, reduces cleaning dead corners, and does not require disassembly for cleaning, simplifying the cleaning process.

[0024] Compared with the prior art, the present invention has at least the following advantages: (1) Easy to clean: The inner cover body and the anti-overflow part are integrally molded structures, which do not require additional connecting components. This reduces cleaning dead corners and eliminates the need for disassembly for cleaning, simplifying the cleaning process. At the same time, by setting the anti-overflow part, a directional flow path is formed for the liquid to flow back to the pot body after overflowing from the vent. The liquid storage tank and the anti-overflow platform form two lines of defense, which can prevent the liquid from spreading to the surface of the inner cover body, thereby clarifying the cleaning area and reducing the cleaning range. (2) Dynamic adjustment of gas and liquid flow: During high-pressure cooking, a local low-pressure zone is formed around the boss. The exhaust port forms a low-resistance channel with a larger cross-sectional area. At this time, with the help of the pressure difference, steam and liquid will be discharged from the exhaust port first. The liquid is received by the liquid storage tank below and returned to the pot through the return hole. When the overflow volume is large, the exhaust port and the return hole work together to discharge the liquid. The side wall of the liquid storage tank constrains the liquid in the tank. As the discharge process progresses, the pressure at the return hole gradually becomes less than the gravity of the liquid return. The liquid in the storage tank flows back to the pot through the return hole, thereby realizing the dynamic adjustment of gas and liquid flow and achieving a balance between efficient pressure relief and overflow prevention. (3) Good overflow prevention effect: The liquid storage tank is equipped with circumferentially distributed return holes. The bottom of the liquid storage tank is inclined and the return holes are located at the inclined end. After the liquid enters the liquid storage tank, it flows along the bottom inclined side to the return holes. The liquid is evenly distributed along the circumference, with high return efficiency and good overflow prevention effect. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial enlarged view of the present invention.

[0026] The attached diagram is labeled as follows: 1. Inner cover body; 2. Overflow prevention part; 21. Boss; 211. Vent; 212. Overflow prevention part; 22. Liquid storage tank; 221. Return hole; 3. Settling tank; 4. Sensor through hole. Detailed Implementation

[0027] The present invention will be further described below with reference to embodiments. Unless otherwise specified, all devices, connection structures, and methods involved in this invention are known in the art.

[0028] Example 1 Reference Figure 1 and Figure 2As shown, this utility model provides an anti-overflow inner cover for a cooking appliance, including an inner cover body 1. The inner cover body 1 is provided with an anti-overflow part 2. The anti-overflow part 2 includes a boss 21 protruding in a first direction and a liquid storage tank 22 located around the boss 21. The concave direction of the liquid storage tank 22 is opposite to the protrusion of the boss 21. The liquid storage tank 22 is used to receive liquid after depressurization and cooling. Its depth is 5mm. The bottom of the liquid storage tank 22 is provided with several return holes 221 to guide the liquid back to the pot body. The diameter of the return holes 221 is 0.75mm. The boss 21 is provided with an exhaust port 211. The lowest position of the exhaust port 211 is higher than the top surface of the liquid storage tank 22, and the cross-sectional area of ​​the exhaust port 211 is greater than the sum of the cross-sectional areas of all the return holes 221.

[0029] The cooking utensil includes a pot body, a lid, and a heating device. The heating device heats the pot body, and the lid seals the pot body to form a cooking cavity, with the first direction being the direction away from the cooking cavity. The lid includes a liner and an inner anti-overflow lid, with the inner anti-overflow lid fitted inside the liner. The two are detachably connected. The connection method between the liner and the inner anti-overflow lid is a commonly used detachable connection type in this field. For example, the edge of the inner anti-overflow lid has several elastic buckles, and the inner side of the liner has corresponding slots that match the buckles. The quick connection between the two is achieved by the engagement of the buckles and the slots. To disassemble, simply press the buckles to remove the inner anti-overflow lid. Alternatively, the inner anti-overflow lid and the liner can be connected by a rotating fastening structure. The edge of the inner anti-overflow lid has external threads, and the inner side of the lid has internal threads. The connection is achieved by rotating to engage the threads, and disassembly is achieved by rotating in the opposite direction.

[0030] In the aforementioned anti-overflow inner cover, during high-pressure cooking, a local low-pressure zone is formed around the boss 21. The exhaust port 211, with its larger cross-sectional area, forms a low-resistance channel. At this time, with the help of the pressure difference, steam and liquid will preferentially be discharged from the exhaust port 211. The liquid is received by the liquid storage tank 22 below and returns to the pot through the return hole 221, realizing the directional flow of gas and liquid. When the overflow volume is large, the exhaust port 211 and the return hole 221 work together to discharge the liquid. The side wall of the liquid storage tank 22 confines the liquid in the tank. As the discharge process progresses, the pressure at the return hole 221 gradually becomes less than the gravity of the liquid return. The liquid in the liquid storage tank 22 flows back to the pot through the return hole 221, thereby realizing the dynamic regulation of gas and liquid flow and achieving a balance between efficient pressure relief and anti-overflow. In this solution, a single-layer anti-overflow structure is adopted, with the liquid storage tank 22 serving as the core anti-overflow area. The overflow liquid is concentrated and confined within its recessed space, reducing the range of stain residue. Furthermore, the large-diameter design of the vent 211 reduces the risk of blockage by sticky stains, making cleaning easier.

[0031] One or more anti-overflow parts 2 may be provided on the inner lid body 1. In some cookware that requires zone heating or cooking of different ingredients, the amount and pressure of steam generated in different areas may vary. Multiple anti-overflow parts 2 can specifically control the venting and anti-overflow, ensuring the stability of the cooking process in each area.

[0032] Example 2 Based on Example 1, such as Figure 1 As shown, this utility model provides an anti-overflow inner cover for a cooking utensil. The inner cover body 1 and the anti-overflow part 2 are integrally formed. Compared with the structure in which the inner cover body 1 and the anti-overflow part 2 are separately set and then connected, the integrally formed structure does not require additional connecting components, reduces cleaning dead corners, and does not require disassembly for cleaning, simplifying the cleaning process. It can meet the anti-overflow and venting needs in various cooking scenarios.

[0033] In this embodiment, as Figure 1 and Figure 2 As shown, the inner cover body 1 has a recessed groove 3 that is recessed away from the first direction. The overflow prevention part 2 is located in the recessed groove 3. The recessed groove 3 includes a first groove and a second groove that continues to be recessed away from the first groove from the bottom. The boss 21 is located in the second groove. The highest position of the exhaust port is not lower than the bottom of the first groove and does not exceed the top of the first groove. The annular space between the second groove and the boss 21 serves as a liquid storage tank 22. The first groove also has a sensor through hole 4. The sensor through hole 4 protrudes from the bottom of the first groove in the first direction. The probes of detection elements such as temperature sensors and pressure sensors pass through the sensor through hole 4 to enter the cooking cavity to detect relevant parameters.

[0034] The inner cover body 1, the first groove, and the liquid storage tank 22 are arranged in a stepped pattern from high to low. The liquid storage tank 22 serves as the first line of defense, and the first groove as the second line of defense. When liquid overflows from the liquid storage tank 22, it falls into the first groove, preventing it from spreading outward and significantly reducing the range of liquid diffusion. This clearly defines the area where stains concentrate, making cleaning easier. The sensor through-hole 4 is located within the first groove, with a compact layout. When there is a small amount of liquid accumulation in the first groove, the raised structure of the sensor through-hole 4 can prevent liquid from directly seeping into the through-hole and damaging the sensor.

[0035] In this embodiment, a plurality of return holes 221 at the bottom of the liquid storage tank 22 are arranged circumferentially around the boss 21. For example, the plurality of return holes 221 are divided into two groups arranged circumferentially around the boss 21, forming a partially enclosing layout, with the spacing between adjacent holes in each group being 5-10 mm to ensure efficient liquid dispersion and flow; alternatively, the plurality of return holes 221 are evenly arranged circumferentially around the boss 21, forming a fully enclosing layout. This circumferential arrangement design allows the liquid collected in the liquid storage tank 22 to flow evenly into the return holes 221 from multiple directions, avoiding localized liquid accumulation due to concentrated hole locations, thus further improving the efficiency and uniformity of liquid flow back to the tank.

[0036] Furthermore, the bottom of the liquid storage tank 22, at the end furthest from the boss 21, is higher than the end closest to the boss 21, and a continuous slope is formed between the two ends. The reflux hole 221 is located near the inclined end. The slope of the slope guides the liquid flow to the reflux hole 221, thereby improving reflux efficiency and reducing liquid residue. In another embodiment, several reflux holes 221 are concentrated on one side, with the bottom of the tank inclined towards that side. That is, the end of the bottom of the liquid storage tank 22 away from the side where the reflux holes 221 are distributed is higher than the end near the side where the reflux holes 221 are distributed, and the two ends form a continuous inclined surface. This design allows the liquid in the liquid storage tank 22 to quickly converge to the side where the reflux holes 221 are concentrated under the combined action of gravity and the slope of the inclined surface, and then be guided back to the pot body through the concentrated distribution of reflux holes 221. This one-sided concentrated layout reduces the setting of holes in unnecessary areas and simplifies the structural design while ensuring the basic reflux effect.

[0037] In this embodiment, to further reduce the risk of spillage, the sidewall of the liquid storage tank 22 is gradually inclined from bottom to top away from the boss 21, with an outward inclination angle of 15°. Compared to a vertical sidewall, the inclined sidewall not only extends the path of liquid spillage, requiring the liquid to flow a longer distance along the inclined surface before spilling, but also forms a guide slope with the help of the inclination angle. When liquid splashes onto the sidewall, it will slide down the inclined surface and fall back into the liquid storage tank 22, thereby effectively reducing the risk of spillage.

[0038] like Figure 2 As shown, the exhaust port 211 is located on the top of the boss 21. Compared with the scheme where the exhaust port 211 is located on the side wall of the boss 21, in this structure the exhaust port 211 is in the airflow path, which results in high exhaust efficiency. Moreover, the height of the boss 21 places the exhaust port 211 at a relatively high position, which can use the height difference to prevent liquid from entering the exhaust channel in reverse and effectively avoid interference of backflow liquid with the exhaust function.

[0039] like Figure 2 As shown, the top surface of the boss 21 is smaller than the bottom surface, and the top and bottom surfaces form a continuous slope. For example, the boss 21 is frustum-shaped or oblique prism-shaped. This sloping structure, which is smaller at the top and larger at the bottom, can naturally guide the steam rising from the pot body, allowing the steam to flow more smoothly along the slope to the exhaust port 211 at the top, reducing the retention and condensation of steam on the side of the boss 21. At the same time, when liquid splashes onto the surface of the boss 21, the slope can guide the liquid along the slope to the liquid storage tank 22 around the boss 21 with the help of gravity, reducing the liquid residue on the top of the boss 21 and improving the liquid recovery efficiency.

[0040] Furthermore, the exhaust port 211 is provided with an overflow prevention element 212, which divides the exhaust port 211 into several openings. Its structure can be a grid or a cross shape. When rice paste or other liquids rush towards the exhaust port 211 with air pressure, part of it will be directly blocked by the solid part of the overflow prevention element 212, and the impact speed of the other part will be slowed down, reducing splashing.

[0041] The total area of ​​several openings accounts for 60%-80% of the top area of ​​the boss 21. When the total area of ​​several openings is less than 60% of the top area of ​​the boss 21, the effective exhaust area is insufficient, the gas flow resistance is large, and the pressure accumulates, which will aggravate the overflow of rice paste; if the proportion exceeds 80%, the anti-overflow component 212 has insufficient structural strength, is difficult to withstand the impact of gas and liquid, and is prone to deformation and breakage.

[0042] The opening edge features an arc design, specifically a crescent shape or a circle with rounded corners, to reduce liquid residue and eliminate cleaning dead spots.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, alterations, or equivalent structural transformations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. An anti-overflow inner lid of a cooking appliance, characterized in that, The inner cover body (1) is provided with an overflow prevention part (2). The overflow prevention part (2) includes a boss (21) protruding in a first direction and a liquid storage tank (22) located around the boss (21). The boss (21) is provided with an exhaust port (211). The bottom of the liquid storage tank (22) is provided with several return holes (221). The cross-sectional area of ​​the exhaust port (211) is greater than the sum of the cross-sectional areas of all the return holes (221).

2. The spill-proof inner cover of a cooking utensil according to claim 1, characterized in that, Several reflux holes (221) are arranged circumferentially around the boss (21).

3. The spill-proof inner cover of a cooking utensil according to claim 2, characterized in that, The bottom of the storage tank (22) is higher at the end away from the boss (21) than at the end near the boss (21), and the two ends form a continuous slope. The reflux hole (221) is located near the inclined end.

4. The spill-proof inner cover of a cooking utensil according to claim 1, characterized in that, The sidewall of the liquid storage tank (22) gradually slopes away from the boss (21) from bottom to top.

5. The spill-proof inner cover of a cooking utensil according to claim 1, characterized in that, The inner cover body (1) is also provided with a recessed groove (3) that is recessed away from the first direction. The overflow prevention part (2) is provided in the recessed groove (3). The recessed groove (3) includes a first groove and a second groove that continues to be recessed away from the bottom of the first groove. The boss (21) is located in the second groove. The annular space between the second groove and the boss (21) serves as a liquid storage tank (22).

6. The spill-proof inner cover of a cooking utensil according to claim 1, characterized in that, The exhaust port (211) is located on the top of the boss (21). The top surface of the boss (21) is smaller than the bottom surface, and the top surface and the bottom surface form a continuous inclined surface.

7. The spill-proof inner cover of a cooking utensil according to claim 6, characterized in that, The exhaust port (211) is provided with an anti-overflow component (212), which divides the exhaust port (211) into several openings.

8. The spill-proof inner cover of a cooking utensil according to claim 7, characterized in that, The total area of ​​several openings accounts for 60%-80% of the top area of ​​the boss (21).

9. The spill-proof inner cover of a cooking utensil according to claim 7, characterized in that, The opening edge has an arc-shaped structure.

10. An anti-overflow inner cover for a cooking utensil according to any one of claims 1 to 9, characterized in that, The inner cover body (1) and the spill prevention part (2) are integrally formed.

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