Cooking utensil and pressure maintaining control method and device

Abstract

The invention discloses a cooking utensil and a pressure maintaining control method and device. The method is applied to the cooking utensil and comprises the steps that under the condition that a pressure limiting valve set comprises an inner valve and an outer valve, the outer valve and the inner valve are controlled to jointly act on an exhaust pipe; food in the cooking utensil is heated according to the preset power, and the outer valve and the inner valve are controlled to ascend or descend according to the detected pressure in the cooking utensil. The pressure cooker solves the technical problem that in the prior art, due to the fact that a single pressure limiting valve structure of a pressure cooker cannot achieve high-pressure continuous heating during cooking, the cooking taste is poor.

Description

[0001] This invention is a divisional application of the invention patent application filed on August 6, 2018, with application number 201810886822.2 and application title "Cooking Utensils, Method and Apparatus for Pressure Control". Technical Field

[0002] This invention relates to the field of cooking utensils, and more specifically, to a cooking appliance, a method and apparatus for pressure control. Background Technology

[0003] Most existing pressure cookers have a single pressure relief valve structure, meaning that the pressure relief valve's pressure range is constant. During cooking, pressure cookers with a single pressure relief valve structure can only automatically release air when the fixed pressure relief value is reached.

[0004] However, if the maximum pressure is limited to a single pressure range during pressure cooker cooking, it is impossible to achieve continuous high-pressure heating and venting / boiling, or continuous low-pressure heating and venting / boiling. The cooking steps are monotonous, which can easily lead to poor taste.

[0005] There is currently no effective solution to the problem that the single pressure relief valve structure of existing pressure cookers cannot achieve continuous high-pressure heating during cooking, resulting in poor taste. Summary of the Invention

[0006] This invention provides a cooking appliance, a method and apparatus for pressure control, to at least solve the technical problem that the single pressure-limiting valve structure of pressure cookers in the prior art cannot achieve continuous high-pressure heating during cooking, resulting in poor cooking taste.

[0007] According to one aspect of the present invention, a pressure-holding control method is provided, applied to a cooking appliance, comprising: controlling the outer valve and the inner valve to act together on an exhaust pipe when the pressure-limiting valve group includes an inner valve and an outer valve; heating food in the cooking appliance according to a preset power, and controlling the lifting or lowering of the outer valve and the inner valve according to the detected pressure in the cooking appliance.

[0008] In this embodiment of the invention, a dual-valve control method is adopted. When the pressure-limiting valve group includes an inner valve and an outer valve, the outer valve and the inner valve are controlled to act together on the exhaust pipe. The food in the cooking appliance is heated according to the preset power, and the outer valve and the inner valve are raised or lowered according to the detected pressure in the cooking appliance. This achieves the purpose of continuous high-pressure heating, thereby improving the technical effect of cooking taste. This solves the technical problem that the single pressure-limiting valve structure of the pressure cooker in the prior art cannot achieve continuous high-pressure heating, resulting in poor cooking taste.

[0009] Optionally, before controlling the outer valve and the inner valve to act together on the exhaust pipe, the method further includes: receiving a dual-stage pressure cooking command; starting the drive motor according to the dual-stage pressure cooking command; controlling the permanent magnet assembly through the drive motor to control the outer valve, thereby controlling the outer valve to fall and heating the food in a high-pressure heating mode.

[0010] Optionally, heating the food in the cooking appliance according to a preset power, and controlling the raising or lowering of the outer and inner valves according to the detected pressure in the cooking appliance includes: when the preset power includes a first preset power, a second preset power, and a third preset power, and the second preset power is less than the first preset power and greater than the third preset power, heating the food in the cooking appliance according to the first preset power; when the first preset pressure is reached, heating the food according to the second preset power; when the second preset pressure is reached, controlling the outer valve to raise, and heating the food according to the third preset power, so that when the outer valve is lowered, a high-pressure heating mode is triggered, so that the high-pressure continuous heating and exhaust can cook the food relatively quickly.

[0011] Further, optionally, heating the food according to the second preset power includes: heating the food according to the second preset power for a first preset time until the pressure inside the cooking appliance is greater than the sum of the pressure limits of the outer valve and the inner valve, and the exhaust pipe continuously exhausts gas, thereby further achieving the technical effect of improving the cooking taste.

[0012] Optionally, controlling the outer valve to lift and heating the food according to the third preset power includes: when the second preset pressure is reached, controlling the outer valve to lift while the inner valve remains unchanged, heating the food according to the third preset power until the pressure inside the cooking appliance is greater than the pressure limit of the inner valve, and the exhaust pipe continuously exhausts gas, thereby further achieving the technical effect of improving the cooking taste.

[0013] According to another aspect of the present invention, a pressure-holding control device is also provided, applied to a cooking appliance, comprising: a first control module for controlling the outer valve and the inner valve to act together on the exhaust pipe when the pressure-limiting valve group includes an inner valve and an outer valve; and a second control module for heating the food in the cooking appliance according to a preset power, and controlling the lifting or lowering of the outer valve and the inner valve according to the detected pressure in the cooking appliance.

[0014] In this embodiment of the invention, a dual-valve control method is adopted. When the pressure-limiting valve group includes an inner valve and an outer valve, the outer valve and the inner valve are controlled to act together on the exhaust pipe. The food in the cooking appliance is heated according to the preset power, and the outer valve and the inner valve are raised or lowered according to the detected pressure in the cooking appliance. This achieves the purpose of continuous high-pressure heating, thereby improving the technical effect of cooking taste. This solves the technical problem that the single pressure-limiting valve structure of the pressure cooker in the prior art cannot achieve continuous high-pressure heating, resulting in poor cooking taste.

[0015] According to another aspect of the present invention, a pressure-holding control device is also provided, comprising: an application to a cooking appliance, including: a pressure-limiting valve assembly and an inner liner mechanism; wherein, the pressure-limiting valve assembly includes an inner valve and an outer valve, and the inner liner mechanism includes a permanent magnet and a drive motor, wherein the drive motor controls the permanent magnet to lower the outer valve, which, together with the inner valve, acts on the exhaust pipe, heats the food in the cooking appliance according to a preset power, and controls the raising or lowering of the outer valve and the inner valve according to the detected pressure in the cooking appliance.

[0016] In this embodiment of the invention, a dual-valve control method is adopted. When the pressure-limiting valve group includes an inner valve and an outer valve, the outer valve and the inner valve are controlled to act together on the exhaust pipe. The food in the cooking appliance is heated according to the preset power, and the outer valve and the inner valve are raised or lowered according to the detected pressure in the cooking appliance. This achieves the purpose of continuous high-pressure heating, thereby improving the technical effect of cooking taste. This solves the technical problem that the single pressure-limiting valve structure of the pressure cooker in the prior art cannot achieve continuous high-pressure heating, resulting in poor cooking taste.

[0017] Optionally, the pressure-limiting valve assembly also includes: a valve seat and a permanent magnet, with the inner valve embedded inside the outer valve and both the inner and outer valves mounted on the valve seat; the permanent magnet is located on the top of the outer surface of the outer valve, achieving the effect of controlling the outer valve to lift or lower.

[0018] Furthermore, optionally, the pressure-limiting valve assembly is located in the inner pot lid assembly.

[0019] Optionally, the liner mechanism also includes: a limiting post, a lever, and a fastener, wherein the limiting post is located on the liner mechanism seat and is used to control the permanent magnet to move to the outer valve position and the reset position; the permanent magnet is connected to the drive motor through the lever, and the drive motor controls the movement of the permanent magnet through the drive lever; the fastener is used to fix the lever on the drive motor.

[0020] Furthermore, optionally, the drive motor includes a stepper motor.

[0021] Optionally, the fasteners include: a set of reinforcing pieces, wherein the set of reinforcing pieces includes: bolts, nuts or retaining pieces.

[0022] Furthermore, optionally, the fixing plate has internal threads that match the bolts.

[0023] According to another aspect of the present invention, a cooking appliance is also provided, comprising: a pressure-holding control device, wherein the pressure-holding control device includes the aforementioned pressure-holding control device.

[0024] Optional cooking appliances include: electric pressure cooker. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0026] Figure 1 This is a schematic flowchart of a pressure holding control method according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic flowchart of another pressure holding control method according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of a pressure-holding control device according to an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of a pressure-holding control device according to an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the pressure limiting valve group in a pressure holding control device according to an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of a pressure-holding control liner mechanism according to an embodiment of the present invention. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] Example 1

[0035] According to an embodiment of the present invention, a method embodiment for pressure holding control is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0036] Figure 1 This is a schematic flowchart of a pressure holding control method according to an embodiment of the present invention, as shown below. Figure 1 As shown, applied to cooking appliances, the method includes the following steps:

[0037] Step S102: When the pressure limiting valve group includes an inner valve and an outer valve, control the outer valve and the inner valve to work together on the exhaust pipe.

[0038] Step S104: Heat the food in the cooking appliance according to the preset power, and control the raising or lowering of the outer valve and the inner valve according to the detected pressure in the cooking appliance.

[0039] Specifically, the pressure control method provided in this application can be applied to cooking appliances, which may include electric pressure cookers. Here, this application takes an electric pressure cooker as an example for explanation. In the electric pressure cooker provided in this application, the pressure limiting valve group of the electric pressure cooker adopts a double valve structure to achieve continuous high-pressure heating treatment during the food cooking process. By controlling the outer valve to fall, it works together with the inner valve on the exhaust pipe.

[0040] It should be noted that the outer valve and the inner valve correspond to different pressure limits. When the inner valve acts on the exhaust pipe, the electric pressure cooker will be in a low-pressure cooking mode, that is, heating within the range of 30-40KP. The odor produced by the food during heating will gradually increase with the pressure inside the pot and will be released as it boils. Continuous heating will cause the pressure inside the pot to reach its pressure limit and automatically release the odor, achieving continuous low-pressure boiling inside the pot.

[0041] With the external and internal valves working together to control the exhaust pipe, the electric pressure cooker will be in a high-pressure cooking mode. That is, continuous heating will cause the pressure inside the pot to rise to the maximum pressure limit and automatically release the exhaust, achieving continuous high-pressure boiling inside the pot.

[0042] The pressure control method provided in this application first uses a high-pressure mode for boiling cooking, allowing the food to cook quickly under high temperature and pressure. Then, it switches to a low-pressure, low-temperature boiling mode to allow the food to absorb more flavor. Switching between these two different pressure-limiting modes completes the entire cooking and pressure-holding process, ensuring that the food is nutritious and flavorful, maintaining continuous boiling while saving cooking time, thus achieving a rapid cooking effect.

[0043] In this embodiment of the invention, a dual-valve control method is adopted. When the pressure-limiting valve group includes an inner valve and an outer valve, the outer valve and the inner valve are controlled to act together on the exhaust pipe. The food in the cooking appliance is heated according to the preset power, and the outer valve and the inner valve are raised or lowered according to the detected pressure in the cooking appliance. This achieves the purpose of continuous high-pressure heating, thereby improving the technical effect of cooking taste. This solves the technical problem that the single pressure-limiting valve structure of the pressure cooker in the prior art cannot achieve continuous high-pressure heating, resulting in poor cooking taste.

[0044] Specifically, Figure 2 This is a schematic flowchart of another pressure holding control method according to an embodiment of the present invention, as shown below. Figure 2 As shown, the pressure holding control method provided in this application is as follows:

[0045] Optionally, before controlling the external valve and the internal valve to act together on the exhaust pipe in step S102, the pressure holding control method provided in this application further includes:

[0046] Step S100: Receive dual-stage pressure cooking command;

[0047] Specifically, during the user's use of the rice cooker, step S100 can be manifested as: selecting the function with the preset dual-stage pressure cooking mode and starting cooking.

[0048] Step S101: Start the drive motor according to the dual-stage pressure cooking command, and control the permanent magnet group to control the outer valve through the drive motor, so as to control the outer valve to fall and heat the food through the high-pressure heating mode.

[0049] Specifically, the control of the external valve can be manifested as: controlling the external valve to drop, which works together with the internal valve on the exhaust pipe.

[0050] Optionally, step S104, which involves heating the food in the cooking appliance according to a preset power and controlling the raising or lowering of the outer and inner valves based on the detected pressure inside the cooking appliance, includes:

[0051] Step S1041: When the preset power includes a first preset power, a second preset power, and a third preset power, and the second preset power is less than the first preset power and greater than the third preset power, the food in the cooking appliance is heated according to the first preset power. When the first preset pressure is reached, the food is heated according to the second preset power. When the second preset pressure is reached, the outer valve is controlled to lift, and the food is heated according to the third preset power. When the outer valve is lowered, the high-pressure heating mode is triggered, so that the high-pressure continuous heating and exhaust can cook the food relatively quickly.

[0052] Further, optionally, heating the food according to the second preset power in step S1041 includes: heating the food for a first preset time according to the second preset power until the pressure inside the cooking appliance is greater than the pressure limit values ​​of the outer valve and the inner valve, and the exhaust pipe continuously exhausts gas, thereby further achieving the technical effect of improving the cooking taste.

[0053] Specifically, in conjunction with steps S100 to S1041, the actual high-pressure cooking process is as follows:

[0054] When the user selects the cooking function with dual cooking pressure, in order for the food in the pot to reach a higher cooking pressure, the inner and outer valves need to work together. Therefore, after cooking starts, the outer valve needs to be controlled to be in the downward state, and the combined gravity of the outer and inner valves acts on the exhaust pipe.

[0055] If cooking is performed at a first preset power and the first preset pressure value (80-90KP) is reached, then heating is performed at a second preset power, which is less than the first power.

[0056] This is the high-pressure cooking process. Continuous heating causes the pressure inside the pot to exceed the combined pressure limit of the inner and outer valves, and the exhaust pipe continuously releases steam until a balance is reached between steam generation and release. The pot is continuously heated to boiling under constant pressure. The food is quickly cooked under high pressure and high temperature. This process lasts for the first preset time T1 (2-10 minutes).

[0057] The outer valve can be raised or lowered by moving it. When the outer valve is lowered, it overlaps the inner valve, and the weight of both valves acts on the exhaust pipe. At this time, the pressure limit of the exhaust pipe is about 80-90 kPa. When the pot is continuously heated and steam is generated, causing the pressure inside the pot to exceed the pressure limit, the exhaust will continue. High-pressure continuous heating and exhaust can cook food relatively quickly.

[0058] Optionally, step S1041, which involves controlling the external valve to lift and heating the food according to the third preset power, includes:

[0059] In step S1042, when the second preset pressure is reached, the outer valve is lifted while the inner valve remains unchanged. The food is heated according to the third preset power until the pressure inside the cooking appliance is greater than the pressure limit of the inner valve. The exhaust pipe continues to exhaust, thereby further achieving the technical effect of improving the cooking taste.

[0060] Specifically, after the first preset time T1 is reached, the solenoid valve is controlled to start pushing the inner and outer valves to exhaust gas. After exhausting to the second preset pressure value, exhausting stops and the outer valve is driven to lift. At this time, only the inner valve's gravity acts on the exhaust pipe, and the pressure limit is 30-40 kPa. Heating is then performed at the third preset power.

[0061] This is the low-pressure cooking process. Continuous heating causes the pressure inside the pot to exceed the pressure limit of the inner valve, and the exhaust pipe continuously releases steam until the steam generation and release reach equilibrium. The pot is continuously heated to boiling at a constant pressure. Food is then simmered slowly over low pressure and low temperature. This process continues until the end of cooking. High-pressure continuous boiling quickly cooks the food, while low-pressure continuous simmering accelerates the absorption of flavors, maximizing the saving of cooking time for the user and resulting in better-tasting food.

[0062] When the outer valve is lifted, only the inner valve is pressed on the exhaust pipe. At this time, the pressure limit of the exhaust pipe is relatively low, about 30-40 kPa. When the steam in the pot continues to increase due to continuous heating, the pressure in the pot exceeds the pressure limit and then continues to exhaust.

[0063] Example 2

[0064] According to another aspect of the present invention, a pressure holding control device is also provided. Figure 3 This is a schematic diagram of a pressure-holding control device according to an embodiment of the present invention, as shown below. Figure 3 As shown, the device is applied to a cooking appliance and includes: a first control module 32, used to control the outer valve and the inner valve to work together on the exhaust pipe when the pressure limiting valve group includes an inner valve and an outer valve; and a second control module 34, used to heat the food in the cooking appliance according to a preset power, and to control the lifting or lowering of the outer valve and the inner valve according to the detected pressure in the cooking appliance.

[0065] In this embodiment of the invention, a dual-valve control method is adopted. When the pressure-limiting valve group includes an inner valve and an outer valve, the outer valve and the inner valve are controlled to act together on the exhaust pipe. The food in the cooking appliance is heated according to the preset power, and the outer valve and the inner valve are raised or lowered according to the detected pressure in the cooking appliance. This achieves the purpose of continuous high-pressure heating, thereby improving the technical effect of cooking taste. This solves the technical problem that the single pressure-limiting valve structure of the pressure cooker in the prior art cannot achieve continuous high-pressure heating, resulting in poor cooking taste.

[0066] Example 3

[0067] According to another aspect of the present invention, a pressure holding control device is also provided. Figure 4 This is a schematic diagram of a pressure-holding control device according to an embodiment of the present invention, as shown below. Figure 4 As shown, the device is applied to a cooking appliance and includes a pressure-limiting valve assembly and an inner liner mechanism. The pressure-limiting valve assembly includes an inner valve 41 and an outer valve 42. The inner liner mechanism includes a permanent magnet 13 and a drive motor 44. The drive motor 44 controls the permanent magnet 43 to lower the outer valve 42, which, together with the inner valve 41, acts on the exhaust pipe 45 to heat the food inside the cooking appliance according to a preset power. The outer valve 42 and the inner valve 41 are raised or lowered according to the detected pressure inside the cooking appliance.

[0068] In this embodiment of the invention, a dual-valve control method is adopted. When the pressure-limiting valve group includes an inner valve 41 and an outer valve 42, the outer valve 42 and the inner valve 41 are controlled to act together on the exhaust pipe 45. The food in the cooking appliance is heated according to a preset power, and the outer valve 42 and the inner valve 41 are raised or lowered according to the detected pressure in the cooking appliance. This achieves the purpose of continuous high-pressure heating, thereby improving the technical effect of cooking taste. This solves the technical problem that the single pressure-limiting valve structure of the pressure cooker in the prior art cannot achieve continuous high-pressure heating, resulting in poor cooking taste.

[0069] Optional, Figure 5 This is a schematic diagram of the pressure-limiting valve assembly in a pressure-holding control device according to an embodiment of the present invention, as shown below. Figure 5 As shown, the pressure limiting valve assembly also includes: a valve seat 46 and a permanent magnet. The inner valve 41 is embedded inside the outer valve 42, and both the inner valve 41 and the outer valve 42 are mounted on the valve seat 46. The permanent magnet is mounted on the top of the outer surface of the outer valve 42, thereby controlling the outer valve 42 to lift or lower.

[0070] Furthermore, optionally, the pressure-limiting valve assembly is located in the inner pot lid assembly.

[0071] Optional, Figure 6 This is a schematic diagram of a pressure-holding control liner mechanism according to an embodiment of the present invention, as shown below. Figure 6 As shown, the inner lining mechanism also includes: a limiting post 48, a lever 49, and a fastener 50. The limiting post 48 is located on the inner lining mechanism seat and is used to control the permanent magnet 43 to move to the position of the outer valve 42 and to the reset position. The permanent magnet 43 is connected to the drive motor 44 through the lever 49, and the drive motor 44 controls the movement of the permanent magnet 43 through the drive lever 49. The fastener 50 is used to fix the lever 49 on the drive motor 44.

[0072] Further, optionally, the drive motor 44 includes a stepper motor.

[0073] Optionally, fastener 50 includes a set of reinforcing pieces, wherein the set of reinforcing pieces includes bolts, nuts, or retaining pieces.

[0074] Furthermore, optionally, the fixing plate has internal threads that match the bolts.

[0075] Example 4

[0076] According to another aspect of the present invention, a cooking appliance is also provided, comprising: a pressure-holding control device, wherein the pressure-holding control device includes the aforementioned pressure-holding control device.

[0077] Optional cooking appliances include: electric pressure cooker.

[0078] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0079] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0080] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0081] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0082] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0083] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0084] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A pressure-holding control device, characterized in that, Applied to cooking utensils, including: A pressure-limiting valve assembly, wherein the pressure-limiting valve assembly includes an inner valve, an outer valve, a valve seat, and a first permanent magnet, the inner valve is embedded inside the outer valve, and both the inner valve and the outer valve are disposed on the valve seat, and the first permanent magnet is disposed on the top of the outer surface of the outer valve; The inner lining mechanism includes a second permanent magnet and a drive motor, wherein the drive motor is used to control the movement of the second permanent magnet so as to control the outer valve through the cooperation of the second permanent magnet and the first permanent magnet; In the high-pressure mode of the cooking appliance, the outer valve is controlled to be in a falling state by the cooperation of the second permanent magnet and the first permanent magnet, so that the outer valve and the inner valve work together on the exhaust pipe of the cooking appliance. In the low-pressure mode of the cooking appliance, the outer valve is switched from a lowered state to a raised state by the cooperation of the second permanent magnet and the first permanent magnet, so that the inner valve acts on the exhaust pipe of the cooking appliance.

2. The pressure-holding control device according to claim 1, characterized in that, The lining mechanism also includes: a limiting post, a lever, and fasteners. The limiting post is located on the inner lining mechanism seat and is used to control the movement of the second permanent magnet to the position of the outer valve and the reset position; The second permanent magnet is connected to the drive motor via a lever, and the drive motor controls the movement of the second permanent magnet by driving the lever; The fastener is used to fix the lever on the drive motor, wherein the fastener includes: a reinforcing plate group, the reinforcing plate group including: bolts, nuts or fixing plates.

3. The pressure-holding control device according to claim 2, characterized in that, When the drive motor drives the lever to control the second permanent magnet to move to the reset position, the cooperation between the second permanent magnet and the first permanent magnet controls the outer valve to be in a falling state. When the drive motor drives the lever to control the second permanent magnet to move to the position of the outer valve, the cooperation between the second permanent magnet and the first permanent magnet causes the outer valve to switch from a falling state to a raised state.

4. The pressure-holding control device according to claim 2, characterized in that, The fixing plate has internal threads, which are matched with the bolt.

5. The pressure-holding control device according to claim 1, characterized in that, The pressure-limiting valve assembly is located in the inner pot lid assembly.

6. A method for pressure holding control, characterized in that, Applied to cooking appliances with external valves and external valves, including: In the high-pressure mode of the cooking appliance, the outer valve is controlled to be in a downward state so that the outer valve and the inner valve work together on the exhaust pipe of the cooking appliance. In the low-pressure mode of the cooking appliance, when the pressure drops to the second preset pressure, the outer valve is controlled to switch from the lowered state to the raised state, so that the inner valve acts on the exhaust pipe of the cooking appliance.

7. The pressure holding control method according to claim 6, characterized in that, The method further includes: When the outer valve and the inner valve work together on the exhaust pipe of the cooking appliance, the food inside the cooking appliance is heated according to the first preset power until the pressure of the cooking appliance reaches the first preset pressure. The food is heated according to the second preset power until the pressure inside the cooking appliance exceeds the pressure limit values ​​of the outer valve and the inner valve; Once the pressure inside the cooking appliance exceeds the pressure limits of the outer valve and the inner valve, the exhaust pipe of the cooking appliance continues to exhaust steam until the steam generation and exhaust are balanced.

8. The pressure holding control method according to claim 7, characterized in that, After achieving a balance between steam generation and exhaust, the method further includes: The cooking appliance uses a solenoid valve to push the inner and outer valves on the exhaust pipe to release air until the pressure inside the cooking appliance drops to a second preset pressure. When the second preset pressure is reached, the cooking appliance enters the low-pressure mode.

9. The pressure holding control method according to claim 6, characterized in that, After controlling the external valve to switch from a lowered state to a raised state, the method further includes: The food inside the cooking appliance is heated according to the third preset power until the pressure inside the cooking appliance exceeds the pressure limit value of the inner valve. The exhaust pipe continues to exhaust until the steam generation and exhaust are balanced.

10. A cooking utensil, characterized in that, include: A pressure-holding control device, wherein the pressure-holding control device comprises the pressure-holding control device according to any one of claims 1 to 5.

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