Pot cover assembly and pressure cooking utensil

Abstract

The pot cover assembly comprises a cover body and an inner cover arranged below the cover body, a valve body fixing seat is fixed on the upper side of the inner cover, a pressure relief hole is formed in the inner cover, a fusible metal piece is arranged at the pressure relief hole, and the fusible metal piece blocks the pressure relief hole. The valve body fixing seat is provided with an opening corresponding to the pressure relief hole so that the fusible metal piece can be communicated with the outside. A sealing piece is arranged between the valve body fixing base and the inner cover and provided with an openable heat insulation part, and the heat insulation part is arranged between the opening and the fusible metal piece. The heat insulation part of the sealing piece isolates the fusible metal piece from the external environment, the influence of the external environment temperature on the melting temperature of the fusible metal piece is reduced, the fusible metal piece is only subjected to the effect of the temperature in the pot as far as possible, the melting point of the fusible metal piece is easier to control, and then the opening time of the pressure relief hole is easier to control; the internal pressure of the pressure cooking utensil can be controlled more reliably, and the safety of the pressure cooking utensil is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to kitchen appliance technical field, concretely relates to a pot cover subassembly and pressure cooking utensil. BACKGROUND

[0002] The cooking utensil (such as micro-pressure rice cooker or high-pressure rice cooker) that can cook at the atmospheric pressure higher than atmospheric pressure usually forms sealed space through pot cover and pot body, and the internal gas pressure gradually rises along with the internal gas increase, and then the food is cooked under pressure environment.

[0003] In order to guarantee the safety of pressure cooking, the pot cover is usually provided with pressure relief hole, and the pressure relief hole is sealed by fusible metal, and the pressure relief hole remains sealed state under the preset safety pressure environment.When the gas pressure in the pot is higher than the set safety pressure value, and the pressure limiting valve and safety valve fail, under the high temperature in the pot, the fusible metal will melt, so that the pressure relief hole is opened, and at this time, the gas in the pot will be discharged through the pressure relief hole to complete pressure relief.

[0004] However, the fusible metal has a certain thickness, one side of which is in contact with high-temperature gas in the pot, and the temperature is higher, and the other side is in contact with the outside air, and the temperature is lower. Therefore, the melting point of the fusible metal is extremely susceptible to the influence of the ambient temperature, causing the temperature in the pot to reach the predetermined temperature value, but the fusible metal does not melt, and thus the cooking utensil exceeds the pressure range of safety protection, causing safety problems. Especially in winter, the ambient temperature is low, and the fusible metal can quickly dissipate heat and cool down through the side in contact with the outside environment, so that even if the pot reaches the preset temperature value, the fusible metal still cannot melt.

[0005] Therefore, the reliability and stability of the opening time of the pressure relief hole in the pressure cooking utensil are difficult to guarantee, and the safety of the pressure cooking utensil is restricted. UTILITY MODEL CONTENTS

[0006] The utility model provides a pot cover subassembly and pressure cooking utensil to solve the problem that the fusible metal is susceptible to the influence of the ambient temperature, the temperature of the fusible metal melting is difficult to control, and the opening time of the pressure relief hole is difficult to control.

[0007] The technical scheme adopted by the utility model is:

[0008] A pot lid assembly includes a lid body and an inner lid disposed below the lid body. A valve body fixing seat is fixed to the upper side of the inner lid. The inner lid has a pressure relief hole, and a fusible metal component is disposed at the pressure relief hole, sealing the pressure relief hole. The valve body fixing seat has an opening corresponding to the pressure relief hole to allow the fusible metal component to communicate with the outside. A sealing element is disposed between the valve body fixing seat and the inner lid. The sealing element has an openable heat-insulating part, which is disposed between the opening and the fusible metal component. In this invention, the fusible metal component is fixed at the pressure relief hole to seal it. The area below the inner lid is a cooking cavity, so the lower side of the fusible metal component communicates with the cooking cavity and can directly contact the high-temperature environment inside the cooking cavity. The valve body fixing seat above the inner lid has an opening corresponding to the pressure relief hole, and the opening and pressure relief hole are arranged vertically to allow the upper side of the fusible metal component to communicate with the external environment and directly contact the outside air. In addition, a sealing element is installed between the valve body fixing seat and the inner cover. The heat-insulating part of the sealing element is located between the opening and the fusible metal part to isolate the fusible metal part from the external environment, reducing the influence of the external temperature on the melting temperature of the fusible metal part, so that the fusible metal part is affected by the temperature inside the pot as much as possible. The heat-insulating part not only prevents some heat loss from the fusible metal part, but also prevents external heat and cold air from reaching the fusible metal part, thereby reducing the factors affecting the melting temperature of the fusible metal part. This makes its melting point easier to control, and consequently, the timing of opening the pressure relief hole is easier to control, enabling more reliable pressure control inside the pressure cooking appliance and improving the safety of the pressure cooking appliance.

[0009] The sealing element has a connecting opening and a passage for a fusible metal component. The heat insulation part is provided corresponding to the passage, and the heat insulation part can move relative to the sealing element to open or close the passage.

[0010] In this design, the heat insulation part can move relative to the main body to open and close the opening. When the gas pressure inside the pot does not reach the preset pressure value, the temperature inside the pot is insufficient to melt the fusible metal part. At this time, the fusible metal part blocks the pressure relief hole, isolating the heat insulation part from the pot environment. The heat insulation part then closes the opening, isolating the fusible metal part from the external environment. When the gas pressure inside the pot reaches the preset value, the temperature inside the pot reaches the melting point of the fusible metal part, causing it to melt. This opens the pressure relief hole, allowing the high-pressure gas inside the pot to directly contact the heat insulation part through the pressure relief hole. The impact on the heat insulation part causes it to move, opening the opening. The high-pressure gas and the melted fusible metal part are then ejected from the opening, completing the pressure relief and preventing the melted fusible metal part from falling into the food inside the pot, thus ensuring the cleanliness of the food.

[0011] The seal also includes a body, and the heat insulation part has a connecting end and a free end. The connecting end is connected to the body, and the heat insulation part can swing around the connecting end to separate the free end from the body to open the passage, or the free end abuts against the body to close the passage.

[0012] In this design, the free end can swing around the connecting end to open and close the passage. When the fusible metal melts, the heat insulation part swings due to the impact of the high-pressure gas inside the pot, causing the passage to open and allowing the gas and molten fusible metal to escape upwards. The heat insulation part is connected to the main body through the connecting end, thus enabling the passage to be opened by movement to allow pressurized gas to pass through, while also ensuring that the heat insulation part is not blown away by the pressurized gas during depressurization.

[0013] The body has an upwardly protruding rib that extends into the opening, and the connecting end is fixed to the rib.

[0014] In this design, the protruding rib and the opening are fitted together. On the one hand, both serve to position the valve body fixing seat and the seal, reducing installation difficulty and improving the positional accuracy of the seal, thereby ensuring a good seal. On the other hand, the edge of the opening limits the deformation and movement of the insulation part, allowing it to move more reliably within a certain range and preventing damage due to excessive movement.

[0015] The seal also includes a body, and the heat insulation part includes at least two elastic diaphragm flaps fixed to the body. The elastic diaphragm flaps have a fixed end and an opening and closing end, and the elastic diaphragm flaps can swing around the fixed end to open or close the opening and closing end.

[0016] In this design, the opening and closing ends of each elastic diaphragm flap are sealed against each other. When the fusible metal part melts, the high-pressure gas inside the pot pushes the elastic diaphragm flap to swing open the opening and closing ends so that the high-pressure gas and the molten fusible metal part can pass through.

[0017] The valve body mounting seat has a limiting portion, which at least partially surrounds the heat insulation portion to press the seal.

[0018] In this solution, the limiting part at least partially surrounds the heat insulation part and presses down on the seal. Since some areas of the heat insulation part can move or deform, pressing the outer side of the heat insulation part with the limiting part can limit the range of movement of the heat insulation part, ensuring that the heat insulation part moves stably and reliably, and avoiding the problem that excessive deformation of the heat insulation part will cause deformation of the seal and reduce the sealing effect.

[0019] The fusible metal part is located on the upper side of the inner cover to block the pressure relief hole, and the sealing part is provided with a limiting groove for accommodating the fusible metal part on the side facing the inner cover.

[0020] In this design, the fusible metal component is fixed to the upper side of the inner cover, which reduces the difficulty of fixing the fusible metal component and the inner cover and prevents the fusible metal component from falling off. To ensure the sealing effect of the fusible metal component on the pressure relief hole, the area of ​​the fusible metal component needs to be larger than the area of ​​the pressure relief hole. Therefore, the fusible metal component is placed on the upper side of the inner cover so that the outer edge of the pressure relief hole can support the fusible metal component. At the same time, the limiting groove on the lower side of the seal not only presses the fusible metal component against the upper surface of the inner cover, making it fit snugly against the inner cover to ensure sealing, but also restricts the movement of the fusible metal component and improves its positional stability.

[0021] The sealing element also includes a sealing part, a heat insulation part is disposed on the sealing part, the inner cover is also provided with an exhaust hole and a pressure limiting hole, the sealing part has a first through hole provided corresponding to the exhaust hole and a second through hole provided corresponding to the pressure limiting hole, the edge of the sealing part is provided with multiple protruding fixing ribs, the pot lid assembly also includes fasteners, the fasteners pass through the inner cover, the fixing ribs and the valve body fixing seat to securely connect them.

[0022] In this design, the seal not only seals the pressure relief port but also the exhaust port and pressure limiting port. Thus, a single seal covers all the openings on the inner cover. Compared to sealing each opening independently, this simplifies the seal's structure and reduces assembly difficulty, allowing for multiple seals to be achieved in a single assembly. Fasteners securely connect the inner cover, valve body mounting base, and seal. Under pre-tightening force, the inner cover and valve body mounting base clamp the seal, ensuring its stability and improving sealing performance. Simultaneously, the fixing ribs are located on the outside of the sealing area, separating the fixing and sealing positions and preventing damage to the seal during fixing.

[0023] An overflow shield is fixed to the lower side of the inner cover, and the projection of the overflow shield toward the inner cover covers the pressure relief hole.

[0024] In this design, once the fusible metal component melts, the pot's internal environment is connected to the outside through the pressure relief vent. At this point, the high-pressure gas inside the pot will rapidly escape through the vent at a high flow rate. During this process, the gas will blow the food inside the pot towards the pressure relief vent, posing a risk that food (especially large leafy vegetables) may block the vent, significantly reducing the pressure relief effect and speed. Furthermore, the broth inside the pot may also enter the pressure relief vent with the gas and spray out, potentially causing overflow. By installing an overflow shield on the underside of the inner lid, not only can the food inside the cooking cavity be blocked, preventing it from reaching the pressure relief vent and ensuring its unobstructed flow, but the overflow shield also lengthens the path of the liquid inside the pot to the pressure relief vent, making the path more tortuous. This helps reduce the kinetic energy of the gas, causing bubbles to burst and the liquid to separate from the gas, thus reducing the risk of overflow.

[0025] This utility model also discloses a pressure cooking appliance, including a pot body and the aforementioned pot lid assembly. The inner lid and the pot body cooperate to form a cooking cavity. The lower side of the fusible metal part is connected to the cooking cavity through a pressure relief hole, and the pressure relief hole and the center line of the cooking cavity are misaligned.

[0026] When the pressure inside the cooking chamber falls below the set safety pressure, a fusible metal component seals the pressure relief vent, isolating the cooking chamber from the outside. When the pressure inside the cooking chamber reaches the set safety pressure, the fusible metal component melts, and the cooking chamber connects to the outside through the pressure relief vent for venting and pressure release. Because the temperature at the center of the cooking chamber is higher and boiling is more intense than at the edges during cooking, liquid in the center is more likely to rise or splash with the gas during venting, potentially causing overflow. By misaligning the pressure relief vent with the centerline of the cooking chamber, liquid in the center cannot directly reach the pressure relief vent, thus mitigating overflow. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 This is a cross-sectional view of the inner cover according to one embodiment of the present utility model;

[0029] Figure 2 for Figure 1 A magnified view of area A in the middle;

[0030] Figure 3 This is a cross-sectional view of a sealing element according to one embodiment of the present invention, wherein the port is in an open state;

[0031] Figure 4 This is a schematic diagram of the sealing element according to one embodiment of the present invention;

[0032] Figure 5 This is a cross-sectional view of the inner cover according to another embodiment of the present invention;

[0033] Figure 6 for Figure 5 A magnified view of area B in the middle;

[0034] Figure 7 This is a cross-sectional view of the seal according to another embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the sealing element according to another embodiment of the present invention;

[0036] Figure 9 This is a cross-sectional view of a pressure cooking appliance according to one embodiment of the present invention.

[0037] in:

[0038] 1. Inner cover; 11. Pressure relief holes;

[0039] 2. Fusible metal parts;

[0040] 3. Valve body mounting base; 31. Opening; 32. Limiting part;

[0041] 4. Sealing element; 41. Insulation part; 411. Free end; 412. Connecting end; 413. Through port; 414. Elastic diaphragm flap; 415. Opening and closing end; 416. Fixed end; 42. Body; 43. Limiting groove; 44. First through hole; 45. Second through hole; 46. Sealing part; 47. Fixing rib;

[0042] 5. Overflow shield; 51. Vent outlet;

[0043] 6. Cover body;

[0044] 7. Cooking cavity. Detailed Implementation

[0045] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0046] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0047] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] like Figure 1 , Figure 5 , Figure 9 As shown, a pot lid assembly includes a lid body 6 and an inner lid 1 disposed below the lid body 6. A valve body fixing seat 3 is fixed on the upper side of the inner lid 1. The inner lid 1 has a pressure relief hole 11. A fusible metal component 2 is disposed at the pressure relief hole 11 and blocks the pressure relief hole 11. The valve body fixing seat 3 is provided with an opening 31 corresponding to the pressure relief hole 11 to allow the fusible metal component 2 to communicate with the outside. A sealing component 4 is provided between the valve body fixing seat 3 and the inner lid 1. The sealing component 4 has an openable heat insulation part 41, which is disposed between the opening 31 and the fusible metal component 2.

[0051] It should be noted that this utility model does not limit the assembly method of the inner cover 1 and the cover body 6. In one embodiment, the inner cover 1 is fixed to the cover body 6 non-removably. In a preferred embodiment, the inner cover 1 is fixed to the cover body 6 detachably. Since the inner cover 1 is in direct contact with the environment inside the cooking cavity 7, it is convenient for the user to clean the inner cover 1. Preferably, the valve body fixing seat 3 is fixed to the inner cover 1 by riveting or other means, and the sealing element 4 is also fixed between the inner cover 1 and the valve body fixing seat 3, so that both can be removed from the cover body 6 together with the inner cover 1, and the relative position of the valve body fixing seat 3 and the inner cover 1 remains unchanged, thereby reducing the difficulty of installation after cleaning and ensuring the clamping effect of the sealing element 4, thus ensuring the sealing performance.

[0052] Preferably, the seal 4 is a structure made of a flexible material, preferably silicone, which can not only withstand high temperatures, but also deform to seal the gap between the valve body fixing seat 3 and the inner cover 1.

[0053] Understandably, the heat insulation part 41 can switch between blocking the opening 31 and opening the opening 31, so that the opening 31 can be selectively opened or closed. For example, when the fusible metal part 2 melts, the heat insulation part 41 can open the opening 31, so that the high-pressure gas in the pot and the molten fusible metal part 2 can be ejected outside the pot lid assembly through the opening 31, without falling into the cooking cavity 7.

[0054] Preferably, the fusible metal part 2 is a low-melting-point alloy, and the melting temperature is selected at the temperature corresponding to 2 to 3.5 times the working pressure of the pressure cooking appliance. The fusible metal part 2 covers the pressure relief hole 11 of the inner cover 1.

[0055] The fusible metal component 2 is fixed at the pressure relief hole 11 to seal it. The cooking chamber 7 is located below the inner cover 1, so the lower side of the fusible metal component 2 is connected to the cooking chamber 7 and can directly contact the high-temperature environment inside the cooking chamber 7. The valve body fixing seat 3 above the inner cover 1 has an opening 31 corresponding to the pressure relief hole 11. The opening 31 and the pressure relief hole 11 are arranged vertically to allow the upper side of the fusible metal component 2 to connect with the external environment and directly contact the outside air.

[0056] In addition, a sealing element 4 is provided between the valve body fixing seat 3 and the inner cover 1. The heat insulation part 41 of the sealing element 4 is located between the opening 31 and the fusible metal part 2 to isolate the fusible metal part 2 from the external environment, reduce the influence of the external ambient temperature on the melting temperature of the fusible metal part 2, and make the fusible metal part 2 only affected by the temperature inside the pot as much as possible. The heat insulation part 41 can not only prevent some of the heat loss of the fusible metal part 2, but also prevent external heat and cold air from reaching the fusible metal part 2, thereby reducing the factors affecting the melting temperature of the fusible metal part 2, making its melting point easier to control, and thus making the opening time of the pressure relief hole 11 easier to control, enabling more reliable pressure control inside the pressure cooking appliance and improving the safety of the pressure cooking appliance.

[0057] As a preferred embodiment of this utility model, such as Figure 2 , Figure 6 As shown, the sealing member 4 is provided with a connecting opening 31 and a passage 413 for the fusible metal part 2. A heat insulation part 41 is provided corresponding to the passage 413, and the heat insulation part 41 can move relative to the sealing member 4 to open or close the passage 413.

[0058] The heat insulation part 41 can move relative to the body 42 of the sealing member 4 to open and close the opening 413. When the gas pressure inside the pot does not reach the preset gas pressure value, the temperature inside the pot is insufficient to melt the fusible metal part 2. At this time, the fusible metal part 2 blocks the pressure relief hole 11, isolating the heat insulation part 41 from the environment inside the pot. The heat insulation part 41 closes the opening 413, isolating the fusible metal part 2 from the external environment. When the gas pressure inside the pot reaches the preset value, the temperature inside the pot reaches the melting point temperature of the fusible metal part 2, causing the fusible metal part 2 to melt. This opens the pressure relief hole 11, allowing the high-pressure gas inside the pot to directly contact the heat insulation part 41 through the pressure relief hole 11 and impact the heat insulation part 41, causing it to move relative to the body 42 and open the opening 413. At this time, the high-pressure gas and the melted fusible metal part 2 are ejected from the opening 31, completing the pressure relief and preventing the melted fusible metal part 2 from falling into the food inside the pot, thus ensuring the cleanliness of the food.

[0059] This embodiment does not limit the specific structure of the heat insulation part 41, and it includes, but is not limited to, the situations listed in the following embodiments:

[0060] Example 1: In this example, as Figures 1 to 4 As shown, the seal 4 also includes a body 42, and the heat insulation part 41 has a connecting end 412 and a free end 411. The connecting end 412 is connected to the body 42, and the heat insulation part 41 can swing around the connecting end 412 to separate the free end 411 from the body 42 to open the passage 413, or the free end 411 abuts against the body 42 to close the passage 413.

[0061] The free end 411 can swing around the connecting end 412 to open and close the passage 413. When the fusible metal 2 melts, the heat insulation part 41 is impacted by the high-pressure gas inside the pot and swings, causing the passage 413 to open and the gas and the molten fusible metal 2 to be discharged upwards. The heat insulation part 41 is connected to the main body 42 through the connecting end 412, so that the passage 413 can be opened by movement to allow the pressurized gas to pass through, while ensuring that the heat insulation part 41 will not be blown away by the pressurized gas when the pressure is released.

[0062] Furthermore, such as Figure 2 , Figure 3 As shown, the body 42 has an upwardly protruding rib that extends into the opening 31, and the connecting end 412 is fixed to the rib.

[0063] The protruding rib and the opening 31 are interlocked, which serves two purposes: firstly, both enable the valve body fixing seat 3 and the sealing element 4 to be positioned and installed, reducing installation difficulty and improving the positional accuracy of the sealing element 4, thereby ensuring the sealing effect; secondly, the edge of the opening 31 can limit the deformation and movement of the heat insulation part 41, allowing the heat insulation part 41 to move more reliably within a certain range and preventing damage due to excessive movement.

[0064] Specifically, such as Figure 2 As shown, the opening 31 extends vertically to form an air outlet channel, the protruding rib extends into the air outlet channel, and the heat insulation part 41 can move within the air outlet channel.

[0065] Example 2: In this example, as Figures 5 to 8 As shown, the sealing member 4 also includes a body 42, and the heat insulation part 41 includes at least two elastic membrane flaps 414 fixed to the body 42. The elastic membrane flaps 414 have a fixed end 416 fixed to the body 42 and an opening and closing end 415. The elastic membrane flaps 414 can swing around the fixed end 416 to open or close the opening and closing end.

[0066] The opening and closing ends 415 of each elastic diaphragm flap 414 abut against each other and seal. When the fusible metal part 2 melts, the high-pressure gas in the pot pushes the elastic diaphragm flap 414 to swing and open the opening and closing ends 415 so that the high-pressure gas and the molten fusible metal part 2 can pass through.

[0067] Specifically, in one example, such as Figure 8 As shown, there are four elastic diaphragm flaps 414. The opening and closing ends 415 of the four elastic diaphragm flaps 414 abut against each other in a cross shape. When the fusible metal part 2 melts, the opening and closing ends 415 of the elastic diaphragm flaps 414 are pushed upward by the gas to swing open and form an opening.

[0068] Of course, the number of elastic flaps 414 can also be other, such as 2, 3, 6, etc., which are not limited here.

[0069] In other embodiments, the heat insulation part 41 can also be designed with other structures, and the opening and closing of the passage 413 can be achieved through other means of movement, which is not limited here. For example, a thinner and more easily deformable connecting rib can be provided between the heat insulation part 41 and the body 42. When gas passes through, it pushes the heat insulation part 41 to move upward, forming the passage 413 between it and the body 42. At this time, the connecting rib is stretched and deformed. When the exhaust is finished, the connecting rib retracts under its own elastic force, causing the heat insulation part 41 to fall and abut against the body 42, closing the passage 413.

[0070] As a preferred embodiment of this utility model, such as Figure 2 , Figure 6As shown, the valve body fixing seat 3 has a limiting part 32, which at least partially surrounds the heat insulation part 41 to press the sealing member 4.

[0071] The limiting part 32 at least partially surrounds the heat insulation part 41 and presses down on the sealing member 4. Since a part of the heat insulation part 41 can move or deform, the limiting part 32 can press the outer side of the heat insulation part 41 to limit the range of movement of the heat insulation part 41, ensuring that the heat insulation part 41 moves stably and reliably, and avoiding the problem that the heat insulation part 41 deforms excessively and causes the sealing member 4 to deform, resulting in a decrease in the sealing effect.

[0072] Specifically, a downwardly protruding pressing rib can be provided on the outer periphery of the outlet to form a limiting part 32, which compresses the seal 4. Alternatively, a pressing plane can be provided on the lower side of the valve body fixing seat 3, making it lower than the plane where the lower edge of the opening 31 is located, so that the sealing element 4 is pressed by the plane.

[0073] Preferably, such as Figure 2 , Figure 3 , Figure 6 , Figure 7 As shown, the fusible metal part 2 is located on the upper side of the inner cover 1 to block the pressure relief hole 11, and the sealing part 4 is provided with a limiting groove 43 for accommodating the fusible metal part 2 on the side facing the inner cover 1.

[0074] The fusible metal component 2 is fixed to the upper side of the inner cover 1, which reduces the difficulty of fixing the fusible metal component 2 and the inner cover 1 and prevents the fusible metal component 2 from falling off. In order to ensure the sealing effect of the fusible metal component 2 on the pressure relief hole 11, the area of ​​the fusible metal component 2 needs to be larger than the area of ​​the pressure relief hole 11. Therefore, the fusible metal component 2 is placed on the upper side of the inner cover 1 so that the outer edge of the pressure relief hole 11 can support the fusible metal component 2. At the same time, the limiting groove 43 on the lower side of the sealing component 4 can not only press the fusible metal component 2 against the upper surface of the inner cover 1, so that it fits tightly against the inner cover 1 to ensure the seal, but also restrict the movement of the fusible metal component 2 and improve the positional stability of the fusible metal component 2.

[0075] Specifically, the valve body fixing seat 3 and the inner cover 1 clamp and fix the fusible metal part 2. Of course, the fusible metal part 2 can also be fixed to the inner cover 1 by other means, such as welding, gluing, etc.

[0076] Of course, the fusible metal part 2 can also be fixed to the lower side of the inner cover 1, as long as it can block the pressure relief hole 11, and there is no limitation here.

[0077] In a preferred embodiment, such as Figure 4 , Figure 8As shown, the sealing element 4 also includes a sealing part 46, a heat insulation part 41 is disposed on the sealing part 46, the inner cover 1 is also provided with an exhaust hole and a pressure limiting hole, the sealing part 46 has a first through hole 44 provided corresponding to the exhaust hole and a second through hole 45 provided corresponding to the pressure limiting hole, the edge of the sealing part 46 is provided with a plurality of protruding fixing ribs 47, the pot lid assembly also includes fasteners, the fasteners pass through the inner cover 1, the fixing ribs 47 and the valve body fixing seat 3 to fasten them.

[0078] The sealing element 4 not only seals the pressure relief hole 11, but also seals the exhaust hole and pressure limiting hole. Thus, a single sealing element 4 seals all the openings on the inner cover 1. Compared to sealing each opening independently, this simplifies the structure of the sealing element 4 and reduces assembly difficulty, allowing for multiple seals to be achieved in a single assembly. Fasteners are used to securely connect the inner cover 1, valve body fixing seat 3, and sealing element 4. Under pre-tightening force, the inner cover 1 and valve body fixing seat 3 clamp the sealing element 4, ensuring its stability and improving the sealing effect. Simultaneously, the fixing rib 47 is located on the outside of the sealing part 46, separating the fixing position from the sealing position, preventing damage to the seal of the sealing part 46 during fixing.

[0079] Specifically, the valve body mounting base 3 has an air outlet corresponding to the exhaust hole, and a pressure limiting valve is fixed to the corresponding pressure limiting hole. For example... Figure 4 , Figure 8 As shown, a plurality of fixing ribs 47 are provided at intervals on the outer periphery of the sealing part 46, and the fixing ribs 47 are provided with through holes for fasteners such as screws to pass through.

[0080] Preferably, such as Figure 1 , Figure 5 , Figure 9 As shown, an overflow cover 5 is fixed to the lower side of the inner cover 1, and the projection of the overflow cover 5 toward the inner cover 1 covers the pressure relief hole 11.

[0081] When the fusible metal part 2 melts, the internal environment of the pot is connected to the outside through the pressure relief hole 11. At this time, the high-pressure gas inside the pot will be ejected rapidly through the pressure relief hole 11 at a high flow rate. During this process, the gas will blow the food in the pot towards the pressure relief hole 11. Therefore, there is a risk that the food (especially large leafy vegetables) will block the pressure relief hole 11, which will greatly reduce the pressure relief effect and speed. In addition, the soup in the pot will also enter the pressure relief hole 11 with the gas and be ejected, which may cause the pot to overflow. By setting an anti-overflow cover 5 on the lower side of the inner cover 1, not only can the food in the cooking cavity 7 be blocked, preventing the food from reaching the pressure relief hole 11, thus ensuring the unobstructed flow of the pressure relief hole 11, but the anti-overflow cover 5 also lengthens the path of the liquid in the pot to the pressure relief hole 11 and makes the path more tortuous, which helps to reduce the kinetic energy of the gas, causing the bubbles to burst and the liquid and gas to separate, thereby reducing the risk of overflow.

[0082] Specifically, such as Figure 1 , Figure 5 As shown, the bottom wall and / or side wall of the overflow cover 5 are provided with an air vent 51 to allow gas in the cooking cavity 7 to pass through and reach the pressure relief hole 11.

[0083] like Figure 1 , Figure 5 As shown, the inner cover 1 is also provided with an exhaust port and a pressure limiting port. The projection of the anti-overflow cover 5 toward the inner cover 1 covers the pressure relief port 11, the exhaust port and the pressure limiting port, so that the anti-overflow cover 5 can be used to prevent the overflow and blockage of each air outlet, which not only simplifies the structure of the inner cover 1, but also saves costs.

[0084] Preferably, the spill cover 5 is made of metal to provide better high-temperature resistance and easy cleaning. The spill cover 5 is detachably connected to the inner cover 1 to facilitate cleaning of the inside of the spill cover 5 by the user.

[0085] like Figure 9 Figure 9 As shown, this utility model also discloses a pressure cooking appliance, including a pot body and the aforementioned pot lid assembly. The inner lid 1 cooperates with the pot body to form a cooking cavity 7. The lower side of the fusible metal part 2 is connected to the cooking cavity 7 through a pressure relief hole 11, and the pressure relief hole 11 is offset from the center line of the cooking cavity 7.

[0086] When the pressure inside the cooking chamber 7 is lower than the set safety pressure value, the fusible metal component 2 seals the pressure relief hole 11, isolating the cooking chamber 7 from the outside. When the pressure inside the cooking chamber 7 reaches the set safety pressure value, the fusible metal component 2 melts, and the cooking chamber 7 connects to the outside through the pressure relief hole 11 to release pressure. Because the temperature at the center of the cooking chamber 7 is higher and the boiling is more intense during cooking, the liquid in the center is more likely to rise or splash with the gas during the venting process, causing overflow. By misaligning the pressure relief hole 11 with the centerline of the cooking chamber 7, the liquid in the center cannot directly reach the pressure relief hole 11, thus mitigating the overflow phenomenon.

[0087] The pressure cooking appliance of this utility model can be a low-pressure cooking appliance, such as a low-pressure rice cooker, or a high-pressure cooking appliance, such as an electric pressure cooker. As long as it can cook at a pressure value higher than the standard atmospheric pressure, it is not limited here.

[0088] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0089] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0090] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1.A pot cover assembly, comprising a cover body and an inner cover arranged below the cover body, wherein an upper side of the inner cover is fixed with a valve body fixing seat, characterized in that, the inner cover is provided with a pressure relief hole, and a fusible metal piece is arranged at the pressure relief hole to block the pressure relief hole, and the valve body fixing seat is provided with an opening corresponding to the pressure relief hole to enable the fusible metal piece to communicate with the outside, and a sealing piece is arranged between the valve body fixing seat and the inner cover, and the sealing piece is provided with a heat insulation part which can be opened, and the heat insulation part is arranged between the opening and the fusible metal piece. 2.The pot cover assembly according to claim 1, characterized in that, the sealing piece is provided with a through hole which communicates the opening and the fusible metal piece, and the heat insulation part is arranged corresponding to the through hole, and the heat insulation part can move relative to the sealing piece to open or close the through hole. 3.The pot cover assembly according to claim 2, characterized in that, the sealing piece further comprises a body, and the heat insulation part has a connecting end and a free end, and the connecting end is connected to the body, and the heat insulation part can swing around the connecting end to separate the free end from the body to open the through hole, or the free end abuts against the body to close the through hole. 4.The pot cover assembly according to claim 3, characterized in that, the body has a convex rib which protrudes upward, and the convex rib extends into the opening, and the connecting end is fixed to the convex rib. 5.The pot cover assembly according to claim 1, characterized in that, the sealing piece further comprises a body, and the heat insulation part comprises at least two elastic membrane petals which are fixed to the body, and the elastic membrane petals have a fixed end and an opening and closing end, and the elastic membrane petals can swing around the fixed end to open or close the opening and closing end. 6.The pot cover assembly according to claim 1, characterized in that, the valve body fixing seat has a limiting part which at least partially surrounds the heat insulation part to press the sealing piece. 7.The pot cover assembly according to claim 1, characterized in that, the fusible metal piece is located on the upper side of the inner cover to shield the pressure relief hole, and the sealing piece is provided with a limiting groove on a side thereof which faces the inner cover to accommodate the fusible metal piece. 8.The pot cover assembly according to claim 1, characterized in that, the sealing piece further comprises a sealing part, and the heat insulation part is arranged in the sealing part, and the inner cover is further provided with an exhaust hole and a pressure limiting hole, and the sealing part has a first through hole which is arranged corresponding to the exhaust hole, and a second through hole which is arranged corresponding to the pressure limiting hole, and the edge of the sealing part is provided with a plurality of convex fixing ribs, and the pot cover assembly further comprises a fastener which passes through the inner cover, the fixing ribs and the valve body fixing seat to be fastened and connected. 9.The pot cover assembly according to claim 1, characterized in that, the lower side of the inner cover is fixed with an anti-overflow cover, and the projection of the anti-overflow cover which faces the inner cover covers the pressure relief hole. 10.A pressure cooking appliance, comprising a pot body, characterized in that, The pot cover assembly also includes the inner cover cooperating with the pot body to form a cooking cavity, the lower side of the fusible metal piece being in communication with the cooking cavity through the pressure relief hole, and the pressure relief hole being disposed offset from a center line of the cooking cavity.

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