Pressure relief devices, thermal insulation covers, and cooking utensils

Abstract

The present application relates to a pressure relief device, a heat-insulating cover, and a cooking utensil. The pressure relief device includes: a ball seat provided with an air outlet; a sealing ring constructed as an elastic structure and disposed on the upper portion of the ball seat, the upper portion of the sealing ring being provided with a flared opening, the bottom of the flared opening being provided with a pressure relief hole connected to the air outlet; a pressure ball movably supported on the flared opening and used to seal or open the pressure relief hole; wherein the flared opening can expand and deform under the action of the gravity of the pressure ball to fill the gap between the flared opening and the pressure ball. The pressure relief device of the present application can prevent the steam in the cooking cavity of the cooking utensil from leaking out from the pressure relief hole when the cooking utensil is cooking food, thereby effectively solving the problem of air leakage between the pressure ball and the ball seat during the cooking process of the cooking utensil and ensuring the stability of the cooking pressure of the cooking utensil.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to a pressure relief device, a heat-insulating cover, and a cooking utensil. Background Art

[0002] The rice cooker is generally provided with a micro-pressure steel ball on the insulation cover. The insulation cover contains a steel ball seat and a micro-pressure steel ball. The micro-pressure steel ball is movably mounted on the steel ball seat and can block the air vent of the steel ball seat.

[0003] When the pressure in the inner pot of the rice cooker is high enough, the water vapor in the inner pot will push the micro-pressure steel ball away and be discharged from the vent of the steel ball seat, thereby relieving the pressure in the inner pot.

[0004] In existing rice cookers, the steel ball seat is generally made of plastic. The micro-pressure steel ball and the steel ball seat are rigidly matched and have poor sealing. When the micro-pressure steel ball is not pushed open, some steam will leak from the air outlet of the steel ball seat, resulting in unstable cooking pressure and slow pressure relief. Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a pressure relief device, a heat-insulating cover, and a cooking appliance, which can solve the problem of air leakage between the pressure ball and the ball seat of the cooking appliance before pressure relief, thereby ensuring the stability of the cooking pressure of the cooking appliance.

[0006] In a first aspect, the present application provides a pressure relief device, comprising:

[0007] a ball seat provided with an air outlet channel;

[0008] A sealing ring is constructed as an elastic structure and is arranged on the upper part of the ball seat. The upper part of the sealing ring is provided with a flared opening, and the bottom of the flared opening is provided with a pressure relief hole connected to the air outlet channel;

[0009] a pressure ball, movably supported on the flared opening, for sealing or opening the pressure relief hole;

[0010] The flared opening can expand and deform under the gravity of the pressure ball to fill the gap between the flared opening and the pressure ball.

[0011] In some embodiments, the sealing ring includes a nesting portion that nests with the ball seat.

[0012] In some embodiments, the inner wall of the nesting portion is provided with at least one annular protrusion, and the annular protrusion is interference fit with the ball seat.

[0013] In some embodiments, the diameter of the pressure ball is greater than the depth of the flared opening.

[0014] In some embodiments, the axis of the flared opening, the axis of the pressure relief hole, and the axis of the air outlet channel are on the same straight line.

[0015] In some embodiments, the inner diameter of the flared opening increases in a direction away from the ball seat.

[0016] In some embodiments, the flare is configured as a trumpet.

[0017] In some embodiments, the pressure relief device further comprises a limiting cover arranged on the outside of the pressure ball, wherein an active cavity for the pressure ball to move is formed between the limiting cover and the pressure ball, and an air outlet communicating with the active cavity is provided on the limiting cover.

[0018] In a second aspect, the present application provides a thermal insulation cover plate, which includes the pressure relief device described above, and the pressure relief device is installed on the thermal insulation cover plate.

[0019] In a third aspect, the present application provides a cooking appliance, comprising:

[0020] A body having a pressure chamber;

[0021] The above-mentioned heat-insulating cover plate is arranged on the device body;

[0022] Wherein, the air outlet channel is communicated with the pressure chamber.

[0023] The pressure relief device according to the first aspect of the present application has at least the following beneficial effects:

[0024] When the pressure relief device of the present application is applied to a cooking utensil, the pressure relief device is installed on the heat-insulating cover plate of the cooking utensil. The pressure relief device is provided with an elastic sealing ring on the upper part of the ball seat and a corresponding flared opening on the upper part of the sealing ring. By utilizing the elasticity of the flared opening, when the pressure ball is supported on the flared opening, the flared opening can expand and deform under the action of the gravity of the pressure ball. Moreover, the flared opening has a tendency to recover the deformation due to its own elastic action. In this way, the flared opening will fit tightly with the curved surface of the pressure ball, thereby filling the gap between the flared opening and the pressure ball, and realizing sealing of the pressure relief hole. When the cooking utensil is cooking food, the steam in the cooking cavity of the cooking utensil will not leak out from the pressure relief hole. This effectively solves the problem of air leakage between the pressure ball and the ball seat during the cooking process of the cooking utensil, ensures the stability of the cooking pressure of the cooking utensil, and can also improve the pressure relief rate of the cooking utensil after the cooking work is completed.

[0025] According to the second aspect of the present application, the heat-insulating cover plate and the third aspect of the cooking utensil have at least the following features:

[0026] Beneficial effects:

[0027] The heat-insulating cover and cooking utensil of the present application, since they are equipped with the above-mentioned pressure relief device, also have the same technical effects brought by the above-mentioned pressure relief device, that is, they can effectively solve the problem of air leakage between the pressure ball and the ball seat of the cooking utensil during the cooking process, ensure the stability of the cooking pressure of the cooking utensil, and also increase the rate of pressure relief of the cooking utensil after the cooking work is completed.

[0028] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0030] Figure 1 This is a schematic structural diagram of a pressure relief device according to an embodiment of the present application;

[0031] Figure 2 This is a partial structural exploded view of the pressure relief device according to an embodiment of the present application;

[0032] Figure 3 This is a schematic structural diagram of a sealing ring according to an embodiment of the present application;

[0033] Figure 4 This is a cross-sectional view of the structure of the sealing ring according to an embodiment of the present application;

[0034] Figure 5 This is a schematic diagram of the coordination structure of the thermal insulation cover and the pressure relief device according to an embodiment of the present application;

[0035] Figure 6 This is a schematic structural diagram of a cooking appliance according to an embodiment of the present application.

[0036] Explanation of the reference numerals: pressure relief device 10; heat-insulating cover 20; cooking utensil 30; utensil body 31; pressure chamber 32; ball seat 100; air outlet channel 110; sealing ring 200; expansion opening 210; pressure relief hole 211; nesting portion 220; annular protrusion 221; pressure ball 300; limiting cover 400; movable chamber 410; air outlet 420. DETAILED DESCRIPTION

[0037] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0040] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0042] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0043] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0044] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0045] Regarding the problem of air leakage between the pressure ball 300 and the ball seat 100 before or during the cooking process of the existing cooking appliance, which affects the stability of the cooking pressure of the cooking appliance, see Figure 1 、 Figure 2 and Figure 3 The present application provides a pressure relief device 10. The pressure relief device 10 includes a ball seat 100, a sealing ring 200 and a pressure ball 300.

[0046] The ball seat 100 is provided with an air outlet channel 110. The sealing ring 200 is constructed as an elastic structure and is disposed on the upper portion of the ball seat 100. The upper portion of the sealing ring 200 is provided with a flared opening 210. The bottom of the flared opening 210 is provided with a pressure relief hole 211 that communicates with the air outlet channel 110. The pressure ball 300 is movably supported on the flared opening 210 and is used to seal or open the pressure relief hole 211. The flared opening 210 can expand and deform under the action of the pressure ball 300's gravity to fill the gap between the flared opening 210 and the pressure ball 300.

[0047] It should be noted that the sealing ring 200 is made of elastic soft rubber, so as to ensure that the flared opening 210 expands and deforms under the gravity of the pressure ball 300 .

[0048] It should be noted that the pressure relief device 10 of the present application is suitable for cooking appliances such as electric pressure cookers and micro-pressure rice cookers. When used on a cooking appliance, the pressure relief device 10 is preferably installed on the cooking appliance's insulation cover. When the insulation cover is sealed on the cooking appliance, the air outlet channel 110 on the ball seat 100 extends into the cooking cavity of the cooking appliance, establishing communication with the cooking cavity of the cooking appliance. After the cooking appliance finishes cooking the food, the high-pressure steam in the cooking cavity can be discharged through the air outlet channel 110.

[0049] When the cooking appliance is cooking food, the heat-insulating cover with the pressure relief device 10 is fitted onto the cooking cavity of the cooking appliance, and the pressure ball 300 is supported on the flared opening 210 on the upper portion of the sealing ring 200. The flared opening 210 can expand and deform under the action of gravity of the pressure ball 300, and the flared opening 210 has a tendency to recover its deformation due to its own elastic effect. In this way, the flared opening 210 will fit tightly with the curved surface of the pressure ball 300, thereby filling the gap between the flared opening 210 and the pressure ball 300, ensuring that the pressure ball 300 completely seals the pressure relief hole 211 at the bottom of the flared opening 210, so that when the cooking appliance is cooking food, the steam in the cooking cavity of the cooking appliance will not leak out through the pressure relief hole 211, thereby effectively solving the problem of air leakage between the pressure ball 300 and the ball seat 100 during the cooking process of the cooking appliance, and ensuring the stability of the cooking pressure of the cooking appliance.

[0050] It should be understood that, during the cooking process of the cooking appliance, as the food is continuously heated, the steam pressure in the cooking cavity will gradually increase, that is, the steam pressure in the air outlet channel 110 will gradually increase. When the cooking appliance completes cooking the food, the steam pressure in the air outlet channel 110 will increase to a maximum value. At this time, the steam pressure in the air outlet channel 110 is greater than the gravity of the pressure ball 300. The high-pressure steam in the air outlet channel 110 will push the pressure ball 300 upward through the pressure relief hole 211. In this way, the pressure ball 300 is pushed upward for a distance by the high-pressure steam, and the pressure ball 300 breaks away from the flare 210, thereby contacting the seal of the pressure relief hole 211 at the bottom of the flare 210. The pressure relief hole 211 is opened, and the high-pressure steam in the cooking cavity leaks outward through the pressure relief hole 211, thereby realizing the pressure relief action.

[0051] It is not difficult to understand that, through the above arrangement, the hidden danger of air leakage between the pressure ball 300 and the ball seat 100 is also eliminated, ensuring that the pressure ball 300 can completely seal the pressure relief hole 211 during the cooking process of the cooking appliance, that is, ensuring that the steam in the cooking cavity will not leak out, ensuring that the pressure in the cooking cavity is stably increased, improving the temperature and pressure increase rate in the cooking cavity, ensuring that the pressure in the cooking cavity is stably increased, that is, accelerating the cooking efficiency of food, and indirectly improving the rate at which the cooking appliance releases pressure after completing the cooking work.

[0052] Obviously, the pressure relief device 10 of the present application is provided with an elastic sealing ring 200 on the upper part of the ball seat 100, and a corresponding flare 210 is provided on the upper part of the sealing ring 200. By utilizing the elasticity of the flare 210, when the pressure ball 300 is supported on the flare 210, the flare 210 can expand and deform under the action of the gravity of the pressure ball 300. Moreover, the flare 210 has a tendency to recover its deformation due to its own elasticity. In this way, the flare 210 will tightly fit with the curved surface of the pressure ball 300, thereby filling the gap between the flare 210 and the pressure ball 300, and achieving sealing of the pressure relief hole 211. When the cooking appliance is cooking food, steam in the cooking appliance will not leak out through the pressure relief hole 211. This effectively solves the problem of air leakage between the pressure ball 300 and the ball seat 100 during the cooking process of the cooking appliance, ensures the stability of the cooking pressure of the cooking appliance, and can also improve the rate of pressure relief of the cooking appliance after the cooking task is completed.

[0053] In some embodiments of this application, see Figure 2 and Figure 3 The sealing ring 200 includes a nesting portion 220 that is nested with the ball seat 100.

[0054] Specifically, the flared opening 210 and the nested portion 220 of the sealing ring 200 are distributed up and down and are integrally formed. The nested portion 220 is annular, the flared opening 210 is in an inverted cone, and the pressure relief hole 211 is opened in the cone of the flared opening 210. Correspondingly, the upper portion of the ball seat 100 is conical and adapted to the shape of the flared opening 210. In this way, the upper portion of the ball seat 100 can provide a guiding and positioning function for the assembly of the flared opening 210, which is conducive to the flared opening 210 fitting closely to the upper portion of the ball seat 100.

[0055] At the same time, the lower part of the ball seat 100 is in the shape of a ring that is adapted to the nesting part 220. In this way, when the sealing ring 200 is assembled on the ball seat 100, the user can slide the nesting part 220 of the sealing ring 200 onto the outer wall of the ball seat 100, and make the flared mouth 210 of the sealing ring 200 fit tightly with the upper part of the ball seat 100, thereby completing the assembly of the sealing ring 200.

[0056] Obviously, by providing a corresponding nesting portion 220 on the sealing ring 200, the sealing ring 200 can be tightly mounted on the ball seat 100, which not only facilitates the overall disassembly and replacement of the sealing ring 200, but also effectively eliminates the gap between the sealing ring 200 and the ball seat 100, preventing the steam in the air outlet channel 110 from leaking to the outside of the ball seat 100, further ensuring the stability of the cooking pressure of the cooking appliance and the stability of the pressure relief process.

[0057] In some embodiments of this application, see Figure 1 and Figure 4The inner wall of the nesting portion 220 is provided with at least one annular protrusion 221 , and the annular protrusion 221 is interference fit with the ball seat 100 .

[0058] Specifically, the nesting portion 220 and the annular protrusion 221 are an integrally formed structure, and both the nesting portion 220 and the annular protrusion 221 are made of elastic soft rubber.

[0059] In a specific embodiment, the inner wall of the nesting portion 220 has an annular protrusion 221. When the nesting portion 220 is sleeved on the ball seat 100, relying on the elasticity of the annular protrusion 221, the outer wall of the ball seat 100 will exert a radial expansion force on the annular protrusion 221, causing the annular protrusion 221 to expand and deform radially outward. Since the annular protrusion 221 has a tendency to recover its deformation radially inward, at this time, the annular protrusion 221 will be tightened on the outer wall of the ball seat 100, thereby increasing the friction between the sealing ring 200 and the ball seat 100, enabling the sealing ring 200 to fit tightly with the ball seat 100 and not easily detached, thereby avoiding the formation of a gap between the sealing ring 200 and the ball seat 100 that allows the steam in the air outlet channel 110 to leak out, further ensuring the stability of the cooking pressure of the cooking appliance and the stability of the pressure relief process.

[0060] In some embodiments of this application, see Figure 1 and Figure 2 , the diameter of the pressure ball 300 is greater than the depth of the flared opening 210 .

[0061] It is easy to understand that when the pressure ball 300 is supported and pressed against the flared opening 210 , part of the pressure ball 300 protrudes from the flared opening 210 , and only the lower area of ​​the pressure ball 300 is tightly fitted against the inner wall of the flared opening 210 .

[0062] In this way, it is ensured that the pressure ball 300 completely seals the pressure relief hole 211 during the cooking process of the cooking appliance. At the same time, it is prevented that the entire area of ​​the pressure ball 300 is wrapped by the expansion 210, which affects the action of the pressure ball 300 being pushed upward by the high-pressure steam to open the pressure relief hole 211. After the cooking appliance finishes cooking the food, the high-pressure steam in the air outlet channel 110 can better push the pressure ball 300 upward, further improving the rate of pressure relief of the cooking appliance after completing the cooking work.

[0063] In some embodiments of this application, see Figure 3 The axis of the expansion opening 210 , the axis of the pressure relief hole 211 and the axis of the air outlet channel 110 are on the same straight line.

[0064] That is, the central axis of the flared opening 210, the central axis of the pressure relief hole 211, and the central axis of the gas outlet passage 110 coincide. This ensures that the high-pressure steam in the gas outlet passage 110 pushes the pressure ball 300 upward in a straight line, ensuring the linearity of the upward movement of the pressure ball 300 and preventing the pressure ball 300 from deviating to the side. After the high-pressure steam in the gas outlet passage 110 is released, the pressure ball 300 freely falls under its own weight to return to a state of pressing against the flared opening 210, completely sealing the pressure relief hole 211 again.

[0065] In some embodiments of this application, see Figure 3 and Figure 4 The inner diameter of the flared opening 210 increases gradually in the direction away from the ball seat 100, that is, the inner wall of the flared opening 210 is generally in an arc shape, so as to better adapt to the arc profile of the pressure ball 300, so that the pressure ball 300 and the inner wall of the flared opening 210 can maintain a close fit, thereby eliminating the gap between the pressure ball 300 and the flared opening 210.

[0066] Specifically, in some embodiments, the flared opening 210 is configured in a trumpet shape to better match the spherical shape of the pressure ball 300 .

[0067] In some embodiments of this application, see Figure 1 The pressure relief device 10 further includes a limiting cover 400 disposed on the outside of the pressure ball 300, and a movable chamber 410 for the pressure ball 300 to move is formed between the limiting cover 400 and the pressure ball 300, and an air outlet 420 communicating with the movable chamber 410 is opened on the limiting cover 400.

[0068] Specifically, the limiting cover 400 can be fixed to the heat-insulating cover of the cooking appliance by screws, or can be fixed to the ball seat 100 by screws, so as to facilitate disassembly, assembly and replacement.

[0069] It is not difficult to understand that when the cooking appliance completes cooking the food, the cooking cavity inside the cooking appliance is depressurized, and the high-pressure steam in the air outlet channel 110 rushes out to the pressure relief hole 211, thereby pushing the pressure ball 300 above the pressure relief hole 211 upward. The pressure ball 300 rises vertically along the movable cavity 410 under the push of the high-pressure steam. At this time, the pressure ball 300 detaches from the expansion port 210, thereby opening the pressure relief hole 211, and the cooking cavity is depressurized.

[0070] It is easy to understand that the greater the pressure of the high-pressure steam, the more work it does on the pressure ball 300, and the longer the vertical movement distance of the pressure ball 300. At this time, due to the presence of the limit cover 400, the pressure ball 300 is pushed upward for a certain distance and then collides with the inner wall of the limit cover 400, thereby preventing the pressure ball 300 from being pushed upward for too long and unable to accurately return to the initial state of the compressed expansion mouth 210, and also eliminating the risk of the pressure ball 300 falling off. Obviously, the limit cover 400 plays a good role in limiting and protecting the pressure ball 300, thereby enhancing the safety protection function of the entire pressure relief device.

[0071] In some embodiments of this application, see Figure 1 and Figure 5 The present application further provides a thermal insulation cover plate 20, which includes the pressure relief device 10 mentioned above, and the pressure relief device 10 is installed on the thermal insulation cover plate 20. Specifically, the ball seat 10 of the pressure relief device 10 can be fixed to the thermal insulation cover plate 20 by screws, so that the pressure relief device 10 is assembled in the thermal insulation cover plate 20 as a whole.

[0072] In addition, in some embodiments of the present application, see Figure 5 and Figure 6 The present application further provides a cooking utensil 30, comprising a body 31 and the aforementioned heat-insulating cover 20. The body 31 defines a pressure chamber 32, the heat-insulating cover 20 is disposed on the body 31, and an air outlet passage 110 communicates with the pressure chamber 32, ensuring that high-pressure steam in the pressure chamber 32 can be discharged through the air outlet passage 110 to the pressure relief hole 211.

[0073] The cooking appliance 30 may be, but is not limited to, household cooking tools such as an electric pressure cooker and a micro-pressure rice cooker.

[0074] Obviously, the heat-insulating cover 20 and the cooking utensil 30 of the present application, since they are equipped with the above-mentioned pressure relief device 10, also have the same technical effect brought by the above-mentioned pressure relief device 10, that is, they can well solve the problem of air leakage between the pressure ball 300 and the ball seat 100 of the cooking utensil during the cooking process, ensure the stability of the cooking pressure of the cooking utensil, and also increase the rate of pressure relief of the cooking utensil after the cooking work is completed.

[0075] At the same time, the hidden danger of air leakage between the pressure ball 300 and the ball seat 100 is eliminated, ensuring that the pressure ball 300 can completely seal the pressure relief hole 211 during the cooking process of the cooking appliance, that is, ensuring that the steam in the cooking cavity will not leak out, ensuring that the pressure in the cooking cavity is stably increased, improving the temperature and pressure increase rate in the cooking cavity, ensuring that the pressure in the cooking cavity is stably increased, that is, accelerating the cooking efficiency of food, and indirectly improving the rate at which the cooking appliance releases pressure after completing the cooking work.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A pressure relief device (10), characterized in that: include: The ball seat (100) is provided with an air outlet passage (110); The sealing ring (200) is constructed as an elastic structure and is arranged on the upper part of the ball seat (100). The upper part of the sealing ring (200) is provided with a flared opening (210), and the bottom of the flared opening (210) is provided with a pressure relief hole (211) communicating with the air outlet channel (110); A pressure ball (300) is movably supported on the flared opening (210) and is used to seal or open the pressure relief hole (211); The flared opening (210) is capable of expanding and deforming under the gravity of the pressure ball (300) to fill the gap between the flared opening (210) and the pressure ball (300); The sealing ring (200) includes a nesting portion (220) nested with the ball seat (100), the nesting portion (220) is slidably sleeved on the outer wall of the ball seat (100), the inner wall of the nesting portion (220) is provided with at least one annular protrusion (221), the annular protrusion (221) is interference-fitted with the ball seat (100), and the nesting portion (220) and the annular protrusion (221) are both made of elastic soft rubber.

2. The pressure relief device according to claim 1, characterized in that: The diameter of the pressure ball (300) is greater than the depth of the flared opening (210).

3. The pressure relief device according to claim 1, characterized in that: The axis of the flared opening (210), the axis of the pressure relief hole (211), and the axis of the air outlet channel (110) are located on the same straight line.

4. The pressure relief device according to claim 1, characterized in that: The inner diameter of the flared opening (210) increases gradually in a direction away from the ball seat (100).

5. The pressure relief device according to claim 4, characterized in that: The flared opening (210) is configured in a trumpet shape.

6. The pressure relief device according to claim 1, characterized in that: The flared opening (210) and the nested portion (220) are distributed vertically and integrally formed.

7. The pressure relief device according to claim 1, characterized in that: The nesting portion (220) is annular, the flared opening (210) is in an inverted cone shape, and the pressure relief hole (211) is provided at the cone portion of the flared opening (210).

8. The pressure relief device according to any one of claims 1 to 7, characterized in that: The pressure relief device (10) further comprises a limiting cover (400) arranged on the outside of the pressure ball (300), wherein an active cavity (410) for the pressure ball (300) to move is formed between the limiting cover (400) and the pressure ball (300), and an air outlet (420) communicating with the active cavity (410) is provided on the limiting cover (400).

9. A thermal insulation cover plate (20), characterized in that: It comprises the pressure relief device (10) according to any one of claims 1 to 8, wherein the pressure relief device (10) is installed on the thermal insulation cover plate (20).

10. A cooking utensil (30), characterized in that: include: A body (31) having a pressure chamber (32); The thermal insulation cover plate (20) according to claim 9, wherein the thermal insulation cover plate (20) is provided on the device body (31); Wherein, the air outlet channel (110) is communicated with the pressure chamber (32).

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