A type of rice cooker

Abstract

This application discloses a heating control system for a rice cooker, belonging to the field of household appliance technology. It overcomes the shortcomings of existing three-dimensional heating rice cookers, which suffer from high costs while maintaining cooking performance. The technical solution to this problem is a rice cooker comprising a pot body, a lid, and a heating device. The lid fits onto the pot body to form a cooking cavity. The pot body includes an outer pot with a receiving cavity and an inner pot located within the receiving cavity. A first IH electromagnetic heating component is located at the bottom of the receiving cavity, and a second IH electromagnetic heating component is located on the side of the receiving cavity. The lid has an electric heating wire assembly located at the top of the cooking cavity. This application primarily aims to achieve both good cooking and heat preservation performance while optimizing costs.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and in particular to an electric rice cooker. Background Technology

[0002] High-end rice cookers in the current technology are usually equipped with three types of heaters: bottom, lid, and side heaters to ensure cooking and heat preservation performance. The bottom heater typically has a power of 800W-1200W, the side heaters 200W-300W, and the lid heater about 25W. The heaters are mainly controlled by IH control and heating wire control.

[0003] However, current rice cookers face numerous unresolved issues in achieving three-dimensional heating technology that coordinates bottom, lid, and side heating, and exhibit significant deficiencies in power control and cooking performance. When using electric heating wires in the side heaters, the low power output makes it difficult to guarantee cooking performance, while increasing the power significantly increases costs. When using IH heating technology in the lid and side coils, the power is too high; after reducing the power through software duty, the lid coil's heat retention performance cannot be guaranteed. When the lid and side coils are controlled synchronously, small amounts of rice are poorly cooked. While using IH heating technology to control the lid and side separately results in good cooking performance, it leads to high costs, and the lid coil's high power during the heat retention phase results in poor heat retention. Utility Model Content

[0004] In order to overcome the shortcomings of existing three-dimensional heating rice cookers, which have excessively high costs while ensuring rice cooking performance, this application provides a rice cooker that can ensure both rice cooking and heat preservation performance, while optimizing costs.

[0005] To achieve the above objectives, this application adopts the following technical solution: an electric rice cooker, including a pot body, a pot lid, and a heating device, wherein the pot lid covers the pot body to form a cooking cavity, the pot body includes an outer pot with a receiving cavity and an inner pot located in the receiving cavity, a first IH electromagnetic heating component is provided at the bottom of the receiving cavity, a second IH electromagnetic heating component is provided on the side of the receiving cavity, and an electric heating wire component is provided on the top of the cooking cavity of the pot lid.

[0006] After adopting the above technical solution, this application has the following advantages: A first IH electromagnetic heating component and a second IH electromagnetic heating component are respectively installed at the bottom and side walls. Compared with traditional side heating wires, the side IH electromagnetic induction directly heats the inner pot in the accommodating cavity, resulting in higher thermal efficiency and effectively compensating for the deficiency of low power in side heaters affecting cooking performance. The top is equipped with an electric heating wire component, forming a three-dimensional heating mode that comprehensively ensures cooking results. Furthermore, compared to using IH heating at the top, using a heating wire component at the top is much cheaper. IH heating heats the inner pot itself through electromagnetic induction. If IH heating is used at the top, higher power is required to ensure cooking results, leading to excessively high power consumption for the entire device and higher control costs, increasing the cost of using cookware. However, heating and heat preservation through the electric heating wire component is more direct, has lower control costs, and lower power consumption, significantly reducing user costs. Moreover, its heat preservation performance is better than that of IH electromagnetic heating.

[0007] Furthermore, the outer pot or lid is equipped with a controller for controlling the first IGBT chip and the first IGBT drive module of the first IH electromagnetic heating assembly, the second IGBT chip and the second IGBT drive module of the second IH electromagnetic heating assembly, and the thyristor chip and the thyristor drive module of the electric heating wire assembly. The controller, the first IGBT drive module, the first IGBT chip, and the first IH electromagnetic heating assembly are sequentially electrically connected. The controller, the second IGBT drive module, the second IGBT chip, and the second IH electromagnetic heating assembly are sequentially electrically connected. The controller, the thyristor drive module, the thyristor chip, and the electric heating wire assembly are sequentially electrically connected.

[0008] Using the aforementioned technical solution, the controller precisely controls the first IGBT drive module, the second IGBT drive module, and their respective thyristor drive modules, allowing for flexible adjustment of the power of the bottom and side wall IH electromagnetic heating components at different stages of rice cooking. For example, in the initial cooking stage, the bottom first IH electromagnetic heating component rapidly heats up at high power, quickly stimulating moisture in the rice grains and ensuring even heating. During the boiling stage, the side wall second IH electromagnetic heating component intervenes as needed, adjusting the heating mode to promote circulation within the pot, preventing undercooked rice and ensuring overall rice quality, improving texture and fullness. During the heat preservation stage, the controller precisely controls the heating power of the top electric heating wire component by regulating the thyristor chip and its drive module, maintaining a stable temperature at the top of the pot and preventing the rice from drying out and hardening due to rapid heat dissipation. Simultaneously, based on the overall temperature feedback within the pot, the controller coordinates the intermittent operation of the bottom and side wall IH electromagnetic heating components, ensuring even heat distribution, extending the heat preservation time, and maintaining the soft and sticky texture of the rice. This controller can control the temperature of the bottom and sides of the inner pot, and then control the temperature of the top of the food through the electric heating wire, so that the food can be heated from all directions, and the individual control can meet the different temperature requirements of various foods.

[0009] Furthermore, the outer pot or lid is equipped with a controller, an IGBT selection circuit, a first IGBT chip, a second IGBT chip, a thyristor drive module, and a thyristor chip. The thyristor drive module and the IGBT selection circuit are electrically connected to the controller, the first IGBT chip and the second IGBT chip are electrically connected to the IGBT selection circuit, the first IH electromagnetic heating component is electrically connected to the first IGBT chip, the second IH electromagnetic heating component is electrically connected to the second IGBT chip, the thyristor drive module is electrically connected to the thyristor chip, and the thyristor chip is electrically connected to the electric heating wire assembly.

[0010] By adopting the aforementioned technical solution, an IGBT selection circuit is introduced. This circuit is located between the controller and the first and second IGBT chips. The controller controls the first and second IGBT chips through the IGBT selection circuit, reducing the direct connection lines between the controller and the IGBT chips and simplifying the layout of the control circuit. Furthermore, the introduction of the IGBT selection circuit reduces the number of drive modules between the controller and the IGBT chips, lowering hardware costs and circuit board space requirements. It also reduces soldering and assembly workload, further reducing production costs. Moreover, the simplified circuit structure improves the integration of the entire control system, reduces the probability of failure, and lowers subsequent maintenance costs.

[0011] Furthermore, the pot lid includes an outer lid assembly and an inner lid, with a heat-dissipating plate for mounting an electric heating wire assembly provided between the inner lid and the outer lid assembly.

[0012] Using the aforementioned technical solution, the heat dissipation plate effectively diffuses the heat generated by the electric heating wire assembly. When the electric heating wire is heating, the heat is first transferred to the heat dissipation plate, which then transfers the heat to the inner lid. This allows the inner lid to evenly distribute the heat to the food, preventing localized overheating of the electric heating wire and resulting in a more uniform temperature distribution at the top of the cooking cavity. This ensures better heating of the top of the food in the pot, guaranteeing consistent cooking results and preventing overcooked rice on top and undercooked rice on the bottom. Since the electric heating wire assembly generates high temperatures during operation, direct contact with the outer or inner lid assembly could cause thermal damage, affecting their lifespan and appearance. The heat dissipation plate, acting as an intermediate medium, absorbs and buffers the high temperatures generated by the electric heating wire, reducing the direct impact of high temperatures on the outer and inner lid assemblies, protecting them, and extending their lifespan. Furthermore, the heat dissipation plate also provides some insulation and heat preservation. It can reduce the heat loss from the electric heating wire assembly to the outside of the outer cover assembly, allowing more heat to accumulate inside the cooking cavity. This helps improve the overall heat preservation performance of the cooking cavity, enabling the rice in the pot to better maintain its temperature and texture during the heat preservation stage, reducing heat loss and energy consumption.

[0013] Furthermore, the heat dissipation plate completely covers the accommodating cavity on the upper and lower projection surfaces.

[0014] By employing the aforementioned technical solution, the heating plate completely covers the accommodating cavity, providing better coverage of the cooking cavity. This allows it to work in conjunction with the first IH electromagnetic heating element at the bottom and the second IH electromagnetic heating element on the side wall, forming a more complete three-dimensional heating mode. During cooking, the food is heated not only from the bottom and sides but also evenly from the top, ensuring that the rice fully absorbs heat from all directions, achieving comprehensive and uniform heating. This prevents localized undercooking or overcooking, greatly improving the quality of the cooked rice.

[0015] Furthermore, the electric heating wire assembly is disposed on the side of the heat dissipation plate away from the inner pot.

[0016] By employing the aforementioned technical solution, placing the heating wire assembly on the side of the heat dissipation plate away from the inner pot avoids direct contact between the heating wire assembly and the food, steam, and oil residue that may be generated during cooking. The inner pot generates a large amount of steam during cooking, which may carry food particles or grease. If the heating wire assembly is directly exposed to the inner pot, it is easily corroded and contaminated, affecting its lifespan and performance. Placing it on the side of the heat dissipation plate away from the inner pot effectively isolates these adverse factors, providing excellent protection for the heating wire assembly and extending its lifespan.

[0017] Furthermore, the electric heating wire assembly is located above the cooking cavity and near the contact point between the inner pot and the inner lid.

[0018] By employing the aforementioned technical solution, the sealing space between the inner pot and the inner lid near their contact point reduces heat loss to the outside. The relatively enclosed contact area between the inner pot and the inner lid prevents heat leakage, allowing more heat generated by the heating element to remain within the cooking cavity, improving heat utilization efficiency and enhancing heat retention. During the heat preservation phase, this helps maintain the temperature within the cooking cavity, extending the rice's heat retention time and improving its texture.

[0019] Furthermore, the second IH electromagnetic heating assembly includes a plurality of second electromagnetic coils, which are arranged vertically and horizontally along the side wall of the inner pot, and / or the first IH electromagnetic heating assembly includes a plurality of first electromagnetic coils, which are arranged radially and horizontally along the inner pot.

[0020] Using the aforementioned technical solution, the rice at different heights in the inner pot requires different amounts of heat during cooking. Multiple second electromagnetic coils, spaced vertically, ensure more even heating of each coil. This results in more uniform heating of the rice throughout the pot, preventing undercooked rice on top and overcooked rice on the bottom. Since different radial positions on the bottom of the inner pot are at varying distances from the center, heat transfer varies. Multiple first electromagnetic coils spaced radially allow for precise control of heating power at different radial positions. For example, the edges of the inner pot dissipate heat relatively quickly, so the power of the coils at the edges can be appropriately increased, while the power in the center can be adjusted to a suitable level. This ensures that the rice at all positions on the bottom of the inner pot is heated evenly, preventing undercooked rice at the edges and overcooked rice in the center. This results in more consistent taste and quality of cooked rice. Compared to using a single large electromagnetic coil, the design with multiple small coils is cheaper to manufacture and install. Furthermore, if one coil malfunctions, only that coil needs to be replaced, without replacing the entire first IH electromagnetic heating assembly, reducing maintenance costs.

[0021] Furthermore, a bottom temperature sensor is provided inside the housing near the bottom of the inner pot, and the bottom temperature sensor is in contact with the bottom of the inner pot; and / or, a lid temperature sensor is provided on the lid near the top of the inner pot; and / or, a pressure sensor is provided inside the housing near the bottom of the inner pot, and the bottom of the inner pot is pressed against the pressure sensor.

[0022] Using the aforementioned technical solution, a bottom temperature sensor monitors the temperature at the bottom of the inner pot in real time, providing accurate temperature feedback to the first IH electromagnetic heating component. During cooking, the controller dynamically adjusts the heating power and time of multiple first electromagnetic coils based on changes in the bottom temperature. A lid temperature sensor monitors the temperature at the top of the inner pot in real time, and combined with data from the bottom temperature sensor, allows the controller to comprehensively understand the temperature distribution within the pot. During the heat preservation stage, based on temperature feedback from the top and bottom, the controller flexibly adjusts the operating status of the first IH electromagnetic heating component, the second IH electromagnetic heating component, and the electric heating wire component, ensuring that the temperature inside the pot remains within a suitable heat preservation range, preventing the rice from becoming dry and hard due to excessive heat or cold due to excessive cold. A pressure sensor accurately measures the weight of the inner pot and the food inside. By acquiring this data, the rice cooker's control system can automatically adjust parameters such as cooking time and heating power based on the amount of food. For example, when cooking different amounts of rice, the system can accurately set the heating time and power based on the weight information fed back by the pressure sensor, ensuring that regardless of the amount of rice, it can cook rice with a good texture.

[0023] Furthermore, the outer pot includes an outer shell and a heat insulation cover, the heat insulation cover forming the accommodating cavity, and the first IH electromagnetic heating component and the second IH electromagnetic heating component are installed on the side of the heat insulation cover away from the inner pot.

[0024] By adopting the aforementioned technical solution, the heat preservation cover effectively reduces heat loss to the outside. The heat generated by the first and second IH electromagnetic heating components is largely retained within the containment cavity under the action of the heat preservation cover, maintaining a higher temperature around the inner pot and thus improving the rice cooker's heat preservation effect. During the heat preservation stage after cooking, heat loss is reduced, extending the time the rice maintains a suitable temperature and preserving its taste and quality. The first IH electromagnetic heating component 3 and the second IH electromagnetic heating component 4 are installed on the side opposite to the inner pot 12, reducing the possibility of collision between the inner pot 12 and the electromagnetic heating components during cleaning or movement, protecting the safety of both the electromagnetic heating components and the inner pot 12, and preventing the electromagnetic components from becoming contaminated with liquid during cleaning, thus avoiding the risk of short circuits. Attached Figure Description

[0025] The following description, in conjunction with the accompanying drawings, further illustrates this application:

[0026] Figure 1 This is a schematic diagram of a rice cooker according to this application;

[0027] Figure 2 The first schematic diagram of the heating control scheme for a rice cooker;

[0028] Figure 3 This is the second schematic diagram of the heating control scheme for a rice cooker.

[0029] Figure Descriptions: 1. Pot body; 11. Cooking cavity; 12. Inner pot; 13. Containing cavity; 14. Outer pot; 2. Pot lid; 21. Outer lid assembly; 22. Inner lid; 3. First IH electromagnetic heating assembly; 33. First electromagnetic coil; 4. Second IH electromagnetic heating assembly; 43. Second electromagnetic coil; 5. Heating wire assembly; 53. Lid heating wire; 6. Controller; 61. IGBT selection circuit; 62. First IGBT chip; 63. Second IGBT chip; 64. Second IGBT driver module; 65. Thyristor chip; 66. Thyristor driver module; 67. First IGBT driver module; 7. Bottom temperature sensor; 71. Lid temperature sensor; 8. Pressure sensor; 9. Insulation cover. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0031] The terms "first," "second," etc. (if present) in the specification and claims of this application are used to distinguish similar objects, not to describe a specific order or sequence. Even if "second" is used before a technical feature for distinction, it does not necessarily imply the presence of "first." It should be understood that in this application, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. It should be understood that in this application, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, and Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Containing X, Y, and Z," "Containing X, Y, and Z" means that all three X, Y, and Z are included; "Containing X, Y, or Z" means that one of X, Y, and Z is included; "Containing X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are included.

[0032] The technical solutions of this application will be described in detail below with specific embodiments. The following specific embodiments can be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0033] like Figure 1As shown, this application provides a rice cooker, including a pot body 1, a pot lid 2 and a heating device. The pot lid 2 covers the pot body 1 to form a cooking cavity 11. The pot body 1 includes an outer pot 14 with a receiving cavity 13 and an inner pot 12 located in the receiving cavity 13. A first IH electromagnetic heating assembly 3 is provided at the bottom of the receiving cavity 13, and a second IH electromagnetic heating assembly 4 is provided on the side of the receiving cavity 13. The pot lid 2 is provided with an electric heating wire assembly 5 located at the top of the cooking cavity 11.

[0034] After adopting the above technical solution, this application has the following advantages: the bottom and the side wall are respectively provided with the first IH electromagnetic heating component 3 and the second IH electromagnetic heating component 4. Compared with the traditional side heating wire, the side IH electromagnetic induction directly heats the inner pot 12 in the accommodating cavity 13, which has higher thermal efficiency and can effectively make up for the defect that the low power of the side heater affects the cooking performance. The top is equipped with an electric heating wire assembly 5, forming a three-dimensional heating mode to ensure the cooking effect from all directions. Compared with IH heating, the cost of using a heating wire assembly at the top is much lower. IH heating uses electromagnetic induction to heat the inner pot 12 itself. If IH heating is used at the top, more power needs to be used at the top to ensure the cooking effect, resulting in excessive power consumption of the entire device. In addition, the control cost of IH heating is relatively higher than that of electric heating wire, which also increases the cost of using the cookware. When heating and keeping warm by radiating heat to the food through the electric heating wire assembly 5, less power is required. Furthermore, the heating method of electric heating wire is more direct and has lower control costs. Therefore, the power consumption of this cookware is lower, significantly reducing the cost of use and control, thus achieving a reduction in the overall cost of the cookware. Moreover, its heat retention performance is better than that of IH electromagnetic heating.

[0035] Understandably, in one embodiment, the outer pot 14 is equipped with a controller 6 for controlling the first IGBT chip 62 and the first IGBT drive module 67 of the first IH electromagnetic heating assembly 3, for controlling the second IGBT chip 63 and the second IGBT drive module 64 of the second IH electromagnetic heating assembly 4, and for controlling the thyristor chip 65 and the thyristor drive module 66 of the electric heating wire assembly 5, such as... Figure 2As shown, the controller 6, the first IGBT drive module 67, the first IGBT chip 62, and the first IH electromagnetic heating component 3 are sequentially electrically connected. The controller 6, the second IGBT drive module 64, the second IGBT chip 63, and the second IH electromagnetic heating component 4 are sequentially electrically connected. The controller 6, the thyristor drive module 66, the thyristor chip 65, and the electric heating wire assembly 5 are sequentially electrically connected. Using the aforementioned technical solution, the controller 6 precisely controls the first IGBT drive module 67, the second IGBT drive module 64, and the thyristor drive module 66, respectively, and can flexibly adjust the power of the bottom and side wall IH electromagnetic heating components for different stages of rice cooking. For example, in the initial stage of cooking, the bottom first IH electromagnetic heating component 3 heats up quickly at high power, rapidly stimulating the moisture in the rice core to ensure even heating of the rice grains. In the boiling stage, the side wall second IH electromagnetic heating component 4 is connected as needed, adjusting the heating mode to promote circulation within the pot, avoiding localized undercooking, comprehensively ensuring the quality of the cooked rice, and improving the taste and fullness of the rice. During the heat preservation stage, the controller 6, through the regulation of the silicon controlled rectifier chip 65 and the silicon controlled rectifier drive module 66, precisely controls the heating power of the top electric heating wire assembly 5, maintaining a stable temperature at the top of the pot and preventing the rice from drying out and hardening due to rapid heat dissipation. Simultaneously, based on the overall temperature feedback inside the pot, it coordinates the intermittent operation of the bottom and side wall IH electromagnetic heating components, ensuring even heat distribution within the pot, extending the heat preservation time, and maintaining the soft and sticky texture of the rice. This controller 6 can control the temperature of the bottom and sides of the inner pot, and further control the temperature of the food top via the electric heating wire, achieving all-around heating of the food, and individual control can meet the different temperature requirements of various ingredients. Specifically, the electric heating wire assembly 5 also includes a lid heating wire 53 located at the top of the cooking cavity 11.

[0036] It is understood that, in another embodiment, such as Figure 3 As shown, the outer pot 14 is equipped with a controller 6, an IGBT selection circuit 61, a first IGBT chip 62, a second IGBT chip 63, a thyristor drive module 66, and a thyristor chip 65. The thyristor drive module 66 and the IGBT selection circuit 61 are electrically connected to the controller 6, the first IGBT chip 62 and the second IGBT chip 63 are electrically connected to the IGBT selection circuit 61, the first IH electromagnetic heating component 3 is electrically connected to the first IGBT chip 62, the second IH electromagnetic heating component 4 is electrically connected to the second IGBT chip 63, the thyristor drive module 66 is electrically connected to the thyristor chip 65, and the thyristor chip 65 is electrically connected to the electric heating wire assembly 5.

[0037] By adopting the aforementioned technical solution, an IGBT selection circuit 61 is introduced. This circuit is located between the controller 6 and the first and second IGBT chips 63. The controller 6 controls the first IGBT chip 62 and the second IGBT chip 63 through the IGBT selection circuit 61, reducing the direct connection lines between the controller 6 and the IGBT chips and simplifying the layout of the control circuit. Furthermore, the introduction of the IGBT selection circuit 61 reduces the number of drive modules between the controller 6 and the IGBT chips, lowering hardware costs and circuit board space requirements. It also reduces soldering and assembly workload, further reducing production costs. Moreover, the simplified circuit structure improves the integration of the entire control system, reduces the probability of failure, and lowers subsequent maintenance costs.

[0038] Understandably, in another embodiment, the controller 6 is not located inside the pot body 1, but inside the pot lid 2. This arrangement is because the pot lid is relatively independent, and placing the controller inside it allows for direct repair or replacement of the controller by focusing on the pot lid when the controller malfunctions, without requiring extensive disassembly of the pot body. This reduces the difficulty and cost of maintenance and improves maintenance efficiency. Furthermore, the IH electromagnetic heating components in the pot body generate strong electromagnetic fields during operation. Placing the controller inside the pot lid, away from these sources of electromagnetic interference, helps improve the stability and reliability of the controller's operation and reduces the impact of electromagnetic interference on the controller's signal transmission and control accuracy. Moreover, the controller located on the pot lid does not occupy internal space in the pot body; it only extends the lid upwards. Since the rice cooker's lid opens upwards, a large space is typically reserved at the top in most usage scenarios. This design facilitates the optimization of the internal structure of the pot body, making the internal layout more compact and rational, better accommodating the heating components, the inner pot, and other components, thus improving the space utilization of the pot body.

[0039] Furthermore, the controller 6 is a microcontroller.

[0040] By adopting the aforementioned technical solution, the microcontroller integrates a microprocessor, memory, input / output interfaces, and other components into a single unit, possessing complete computer functions. For the heating control of a rice cooker, this high degree of integration reduces the use of external components, lowers circuit complexity, and thus improves system stability and reliability. The reduced number of connecting lines between components also lowers the probability of system errors due to circuit faults.

[0041] Understandably, controller 6 can also use control elements from one of the following: microcontroller unit (MCU), digital signal processor (DSP), and application-specific integrated circuit (ASIC).

[0042] Furthermore, the pot lid 2 includes an outer lid assembly 21 and an inner lid 22, and a heat-dissipating plate for mounting the electric heating wire assembly 5 is provided between the inner lid 22 and the outer lid assembly 21.

[0043] Using the aforementioned technical solution, the heat dissipation plate can effectively diffuse the heat generated by the electric heating wire assembly 5. When the electric heating wire is heating, the heat is first transferred to the heat dissipation plate, which then transfers the heat to the inner cover 22. This allows the inner cover 22 to evenly distribute the heat to the food, preventing excessively high local temperatures on the electric heating wire and resulting in a more uniform temperature distribution at the top of the cooking cavity 11. This allows for better heating of the top of the food in the pot, ensuring consistent cooking results and preventing the rice from being overcooked on top and undercooked on the bottom. Since the electric heating wire assembly 5 generates high temperatures during operation, direct contact with the outer cover assembly 21 or the inner cover 22 could cause thermal damage, affecting their lifespan and appearance. The heat dissipation plate, acting as an intermediate medium, absorbs and buffers the high temperatures generated by the electric heating wire, reducing the direct impact of high temperatures on the outer cover assembly 21 and the inner cover 22, thus protecting them and extending their lifespan. Furthermore, the heat dissipation plate also provides some insulation and heat preservation. It can reduce the heat generated by the electric heating wire assembly 5 from dissipating to the outside of the outer cover assembly 21, allowing more heat to accumulate inside the cooking cavity 11, which helps to improve the overall heat preservation performance of the cooking cavity 11, so that the rice in the pot can better maintain its temperature and taste during the heat preservation stage, reduce heat loss, and reduce energy consumption.

[0044] Specifically, the heat dissipation plate is made of a material with good thermal conductivity and heat resistance, such as 304 stainless steel or aluminum. The inner cover 22 can be directly connected to the heat dissipation plate, or there can be a gap between them, which can be designed and manufactured according to the specific application scenario.

[0045] Furthermore, the heat dissipation plate completely covers the accommodating cavity 13 on the upper and lower projection surfaces.

[0046] By adopting the aforementioned technical solution, since the heating plate completely covers the accommodating cavity 13, it can better cover the cooking cavity 11. This allows it to work in conjunction with the first IH electromagnetic heating component at the bottom and the second IH electromagnetic heating component on the side wall to form a more complete three-dimensional heating mode. During cooking, the food is heated not only from the bottom and sides but also evenly from the top, ensuring that the rice fully absorbs heat from all directions, achieving comprehensive and uniform heating. This avoids localized undercooking or overcooking, greatly improving the quality of the cooked rice.

[0047] Furthermore, the electric heating wire assembly 5 is disposed on the side of the heat dissipation plate away from the inner pot 12.

[0048] By adopting the aforementioned technical solution, the electric heating wire assembly 5 is positioned on the side of the heat dissipation plate away from the inner pot 12. This avoids direct contact between the electric heating wire assembly 5 and the food, steam, and oil residue that may be generated during cooking within the inner pot 12. The inner pot 12 generates a large amount of steam during cooking, which may carry food particles or grease. If the electric heating wire assembly 5 is directly exposed to the inner pot 12, it is easily corroded and contaminated, affecting its service life and performance. Positioning it on the side of the heat dissipation plate away from the inner pot 12 effectively isolates these adverse factors, providing good protection for the electric heating wire assembly 5 and extending its service life.

[0049] Furthermore, the electric heating wire assembly 5 is located above the cooking cavity 11 and near the contact point between the inner pot 12 and the inner lid 22.

[0050] By employing the aforementioned technical solution, the sealing space between the inner pot 12 and the inner lid 22 near the contact point can reduce heat loss to the outside. The relatively enclosed contact point between the inner pot 12 and the inner lid 22 prevents heat leakage, allowing more heat generated by the electric heating wire assembly 5 to be retained within the cooking cavity 11, improving heat utilization efficiency and enhancing heat retention performance. During the heat preservation stage, this helps maintain the temperature within the cooking cavity 11, extending the heat preservation time of the rice and improving its texture.

[0051] Furthermore, the second IH electromagnetic heating assembly 4 includes a plurality of second electromagnetic coils 43, which are arranged vertically and horizontally along the side wall of the inner pot 12.

[0052] Using the aforementioned technical solution, the rice at different heights in the inner pot 12 has different heat requirements during cooking. Multiple second electromagnetic coils 43 are spaced vertically, allowing for individual control of the heating power and time of each coil according to the characteristics of the rice at different heights. For example, rice at the bottom, being closer to the bottom of the pot, receives more heat, while rice at the top receives relatively less heat. In this case, the heating power of the upper coils can be increased to ensure more even heating of the rice throughout the pot, preventing the upper layer of rice from being undercooked and the lower layer from becoming overcooked.

[0053] Understandably, multiple second electromagnetic coils 43 can also be spaced out along the circumference of the inner pot 12's side wall. This arrangement better simulates the circumferential heating effect when cooking rice in a traditional wood-fired stove or iron pot, creating a phenomenon similar to "heat convection." During the heat preservation stage, the circumferentially distributed electromagnetic coils ensure uniform temperature along the circumference of the inner pot 12's side wall, preventing localized excessively low temperatures. Even when the external ambient temperature changes, it can better maintain the overall temperature stability inside the pot, extending the rice's heat preservation time and freshness retention effect.

[0054] In another embodiment, the second electromagnetic coil 43 of the second IH electromagnetic heating assembly 4 can be a continuous coil, and the second electromagnetic coil 43 can be spirally upward around the side wall near the inner pot 12.

[0055] Furthermore, the first IH electromagnetic heating assembly 3 includes a plurality of first electromagnetic coils 33, which are arranged radially at intervals along the inner pot 12.

[0056] Using the aforementioned technical solution, the distance from the center varies at different radial positions on the bottom of the inner pot 12, resulting in differences in heat transfer. Multiple first electromagnetic coils 33 are arranged radially at intervals, allowing for precise control of heating power at different radial positions. For example, since heat dissipates relatively quickly at the edges of the inner pot 12, the power of the coils at the edges can be appropriately increased, while the power in the central area can be adjusted to a suitable level. This ensures that the rice at all positions on the bottom of the inner pot 12 is heated evenly, preventing undercooked rice at the edges and overcooked rice in the center. This results in more consistent taste and quality of cooked rice. Compared to using a single large electromagnetic coil, the design with multiple small coils is less expensive to manufacture and install. Moreover, if a single coil malfunctions, only that coil needs to be replaced, eliminating the need to replace the entire first IH electromagnetic heating assembly 3, thus reducing maintenance costs.

[0057] Understandably, multiple first electromagnetic coils 33 can also be distributed along a fan shape, enabling more refined heating of multi-functional areas. For example, when baking food, the heating of the corresponding fan-shaped area can be precisely controlled according to the shape and size of the food to meet different cooking needs.

[0058] In another embodiment, the first electromagnetic coil 33 of the first IH electromagnetic heating component 3 can be a continuous coil, and the first electromagnetic coil 33 can be laid in a spiral outward trend near the bottom wall of the inner pot 12.

[0059] In one embodiment, temperature sensors are provided inside the outer pot 14 near the bottom of the inner pot 12 and on the lid 2 near the top of the inner pot 12, wherein the bottom temperature sensor 7 is in contact with the bottom of the inner pot 12.

[0060] Using the aforementioned technical solution, the bottom temperature sensor 7 monitors the temperature of the bottom of the inner pot 12 in real time, providing accurate temperature feedback to the first IH electromagnetic heating component 3. During cooking, the controller 6 can dynamically adjust the heating power and time of multiple first electromagnetic coils 33 based on changes in the bottom temperature. The lid temperature sensor 71 can monitor the temperature of the top of the inner pot 12 in real time, and combined with the data from the bottom temperature sensor 7, allows the controller 6 to have a comprehensive understanding of the temperature distribution inside the pot. During the heat preservation stage, based on the temperature feedback from the top and bottom, the working status of the first IH electromagnetic heating component 3, the second IH electromagnetic heating component 4, and the electric heating wire component 5 is flexibly adjusted to ensure that the temperature inside the pot is always maintained within a suitable heat preservation range, preventing the rice from becoming dry and hard due to excessive temperature or cold due to excessive temperature.

[0061] In another embodiment, a lid temperature sensor 71 is provided on the lid 2 near the top of the inner pot 12.

[0062] This design keeps the top temperature sensor away from the bottom heating source, allowing for more accurate measurement of the ambient temperature above the food or liquid inside the pot. It avoids direct interference from heat generated by the bottom heating element, thus providing a more accurate reflection of the overall thermal state inside the pot. This is particularly beneficial for cooking scenarios requiring precise temperature control and prevention of localized overheating. Furthermore, eliminating the need for a temperature sensor at the bottom of the pot reduces openings and wiring, resulting in a simpler structure and lower manufacturing complexity and cost. It also reduces potential safety hazards such as leaks and electrical malfunctions that could result from bottom sensor mounting holes, improving the pot's safety and reliability.

[0063] Understandably, the lid temperature sensor 71 is used to detect the rising steam temperature in the cooking cavity 11.

[0064] In another embodiment, a bottom temperature sensor 7 is provided inside the outer pot 14 near the bottom of the inner pot 12, and the bottom temperature sensor 7 is in contact with the bottom of the inner pot 12.

[0065] This design allows the bottom temperature sensor to directly contact the bottom of the inner pot, enabling it to directly sense temperature changes at the bottom of the pot and accurately reflect the heating effect of the heating element. This is particularly useful for cooking processes that require rapid heating or have strict requirements on heating speed.

[0066] Furthermore, a pressure sensor 8 is provided inside the outer pot 14 near the bottom of the inner pot 12, and the bottom of the inner pot 12 is pressed against the pressure sensor 8.

[0067] Using the aforementioned technical solution, the pressure sensor 8 can accurately measure the weight of the inner pot 12 and the food inside. By acquiring this data, the rice cooker's control system can automatically adjust parameters such as cooking time and heating power according to the amount of food. For example, when cooking different amounts of rice, the system can accurately set the heating time and power based on the weight information fed back by the pressure sensor 8, ensuring that no matter how much rice is cooked, it can produce rice with a good texture.

[0068] Furthermore, the outer pot 14 includes an outer shell and a heat insulation cover 9, the heat insulation cover 9 forms the receiving cavity 13, and the first IH electromagnetic heating component 3 and the second IH electromagnetic heating component 4 are installed on the side of the heat insulation cover 9 away from the inner pot 12.

[0069] By employing the aforementioned technical solution, the heat preservation cover 9 effectively reduces heat loss to the outside. The heat generated by the first IH electromagnetic heating element 3 and the second IH electromagnetic heating element 4 is largely retained within the accommodating cavity 13 under the action of the heat preservation cover 9, maintaining a higher temperature around the inner pot 12 and thus improving the rice cooker's heat preservation effect. During the heat preservation stage after cooking, heat loss is reduced, extending the time the rice maintains a suitable temperature and preserving its taste and quality. The first IH electromagnetic heating element 3 and the second IH electromagnetic heating element 4 are installed on the side opposite to the inner pot 12, reducing the possibility of collision between the inner pot 12 and the electromagnetic heating elements during cleaning or movement, protecting the safety of both the electromagnetic heating elements and the inner pot 12, and preventing the electromagnetic elements from becoming contaminated with liquid during cleaning, thus avoiding the risk of short circuits.

[0070] Specifically, the material of the heat insulation cover 9 is a material with poor magnetic conductivity, good heat resistance and good heat insulation performance, such as an aluminum heat insulation cover 9.

[0071] In addition to the preferred embodiments described above, this application has other implementation methods. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection claimed in this application.

Claims

1. An electric rice cooker, comprising a pot body, a pot lid and a heating device. The pot lid is covered on the pot body to form a cooking cavity. The pot body includes an outer pot provided with a containing cavity and an inner pot located in the containing cavity. The feature is that, A first IH electromagnetic heating component is provided at the bottom of the accommodating cavity, a second IH electromagnetic heating component is provided at the side of the accommodating cavity, and an electric heating wire component is provided at the top of the cooking cavity on the pot lid.

2. The rice cooker according to claim 1, wherein A controller is provided on the outer pot or the pot lid, which is used to control the first IGBT chip and the first IGBT drive module of the first IH electromagnetic heating component, the second IGBT chip and the second IGBT drive module of the second IH electromagnetic heating component, and the thyristor chip and the thyristor drive module for controlling the electric heating wire component. The controller, the first IGBT drive module, the first IGBT chip, and the first IH electromagnetic heating component are electrically connected in sequence. The controller, the second IGBT drive module, the second IGBT chip, and the second IH electromagnetic heating component are electrically connected in sequence. The controller, the thyristor drive module, the thyristor chip, and the electric heating wire component are electrically connected in sequence.

3. The rice cooker according to claim 1, characterized in that, A controller, an IGBT selection circuit, a first IGBT chip, a second IGBT chip, a thyristor drive module, and a thyristor chip are provided on the outer pot or the pot lid. The thyristor drive module and the IGBT selection circuit are respectively electrically connected to the controller. The first IGBT chip and the second IGBT chip are respectively electrically connected to the IGBT selection circuit. The first IH electromagnetic heating component is electrically connected to the first IGBT chip. The second IH electromagnetic heating component is electrically connected to the second IGBT chip. The thyristor drive module is electrically connected to the thyristor chip. The thyristor chip is electrically connected to the electric heating wire component.

4. A rice cooker according to claim 1, characterized in that The pot lid includes an outer lid component and an inner lid. A heat release plate for installing the electric heating wire component is provided between the inner lid and the outer lid component.

5. The rice cooker according to claim 4, characterized in that, The heat release plate completely shields the accommodating cavity in the up and down projection planes.

6. The rice cooker according to claim 4, characterized in that, The electric heating wire component is provided on the side of the heat release plate facing away from the inner pot.

7. A rice cooker according to claim 4, characterized in that The electric heating wire component is provided above the cooking cavity and near the joint between the inner pot and the inner lid.

8. A rice cooker according to any one of claims 1 to 7, characterized in that, The second IH electromagnetic heating component includes a plurality of second electromagnetic coils, and the plurality of second electromagnetic coils are arranged at intervals up and down along the side wall of the inner pot. And / or, the first IH electromagnetic heating component includes a plurality of first electromagnetic coils, and the plurality of first electromagnetic coils are arranged at intervals along the radial direction of the inner pot.

9. A rice cooker according to any one of claims 1 to 7, characterized in that, A bottom temperature sensor for detecting the temperature of the inner pot is provided at the bottom of the outer pot, and the bottom temperature sensor contacts the bottom of the inner pot; and / or, the pot lid is provided with a lid temperature sensor for detecting the temperature in the cooking cavity, and / or, a pressure sensor is provided at the bottom of the outer pot, and the bottom of the inner pot presses against the pressure sensor.

10. A rice cooker according to any one of claims 1 to 7, characterized in that, The outer pot includes a housing and a heat preservation cover. The accommodating cavity is formed inside the heat preservation cover. The first IH electromagnetic heating component and the second IH electromagnetic heating component are installed on the side of the heat preservation cover facing away from the inner pot.

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