Upper cover assembly and electric cooker

Abstract

The utility model discloses an upper cover assembly and an electric cooker. The upper cover assembly comprises an upper cover and a lower cover, the inner cover is detachably mounted on the inner side of the bottom of the upper cover; the heat preservation plate is installed between the upper cover and the inner cover, gaps are formed between the heat preservation plate and the upper cover and between the heat preservation plate and the inner cover so that a first cavity and a second cavity can be formed, and the first cavity and the second cavity are communicated through the middle and the circumferential edge of the heat preservation plate; and the heating device is arranged in the first cavity and comprises a centrifugal impeller and a heating piece, the heating piece is installed on the peripheral side of the centrifugal impeller, and the centrifugal impeller is installed corresponding to the middle of the heat preservation plate so that circulating heat convection can be achieved between the first cavity and the second cavity through the middle and the peripheral edge of the heat preservation plate during rotation. The electric cooker can realize uniform heating of the inner cover, and prevents local formation of a cold end on the inner cover plate, so that steam in the cooking cavity is prevented from forming condensed water on the inner cover plate, the taste of food in the cooking cavity is guaranteed, and meanwhile, the electric cooker is convenient to clean and can be normally used for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of cooking equipment, in particular to an upper cover assembly and an electric rice cooker. Background Art

[0002] An electric rice cooker is a common kitchen appliance that converts electrical energy into heat energy for steaming, boiling, stewing, simmering, and other cooking processes. It is convenient, safe, and reliable to use. An electric rice cooker consists of a lid assembly, a pot body, and an inner pot. The inner pot is located within the pot body, and the lid assembly is mounted on the pot body. The lid assembly and pot body together form a cooking chamber.

[0003] Currently, rice cookers typically use heating wires for heating. The heating wires are located on an insulation plate within the upper lid assembly. These wires heat the insulation plate to 110°C-120°C, which then radiates heat to the inner cover beneath it, raising its temperature to 100°C. However, the heating wires do not completely cover the insulation plate. The plate covered by the heating wires heats higher, while the plate uncovered heats lower. This results in uneven heating of the insulation plate, leading to uneven temperatures on the inner cover, where the heat radiates from the insulation plate. This creates distinct hot and cold ends, with the hot end at 100°C or above and the cold end below 100°C. When steam rises within the cooking chamber and encounters the cold inner cover, it cools and forms condensation. When the upper lid assembly is opened, this condensation forms a stream that flows onto the upper lid assembly, the cooker body, the inner pot, and even outside the rice cooker. This not only affects the taste of the food within the cooking chamber, but also makes cleaning difficult and can easily damage the rice cooker. Utility Model Content

[0004] In order to overcome at least one of the defects of the above-mentioned prior art, the purpose of the present invention is to provide an upper cover assembly and an electric rice cooker, which utilize the circulating heat convection of the two chambers to achieve uniform heating of the inner cover, avoid the formation of a local cold end on the inner cover plate, and thus prevent the steam in the cooking cavity from forming condensation water on the inner cover plate, so as to ensure the taste of the food in the cooking cavity, and at the same time facilitate the cleaning of the rice cooker and ensure the long-term normal use of the rice cooker.

[0005] The technical solution adopted by the present invention to solve the problem is:

[0006] A top cover assembly, comprising:

[0007] Upper cover;

[0008] An inner cover, which is detachably mounted on the inner side of the bottom of the upper cover;

[0009] An insulation board is installed between the upper cover and the inner cover. Gaps are provided between the insulation board and the upper cover and the inner cover to form a first chamber and a second chamber respectively. The first chamber and the second chamber are connected through the middle portion and the circumferential edge of the insulation board.

[0010] The heating device is arranged in the first chamber. The heating device includes a centrifugal impeller and a heating element. The heating element is installed on the peripheral side of the centrifugal impeller. The centrifugal impeller is installed corresponding to the middle part of the insulation plate so that when it rotates, the first chamber and the second chamber circumferential heat convection is circulated through the middle part and the circumferential edge of the insulation plate.

[0011] As a preferred embodiment, in one of the present inventions, the insulation plate includes a bottom plate and side plates, the side plates are arranged on the peripheral sides of the bottom plate and extend to be fixed to the upper cover, a first air outlet is opened in the middle of the bottom plate, and a plurality of second air outlets are opened at intervals on the side plates to connect the first chamber and the second chamber through the first air outlet and the second air outlet.

[0012] As a preferred embodiment, in one of the present inventions, the upper cover includes an outer cover and a support cover, the support cover is installed inside the outer cover so that a first chamber is formed between the support cover and the insulation board, a gap is provided between the support cover and the outer cover to accommodate the motor, the motor is installed on the support cover, and the output shaft of the motor passes through the support cover to connect to the centrifugal impeller.

[0013] As a preferred embodiment, in one of the present inventions, the heating element includes a heating wire, the heating wire is attached to the upper surface of the insulation board, and the heating wire is located on the peripheral side of the centrifugal impeller.

[0014] As a preferred embodiment, in one of the present inventions, the heating element includes a light wave heating tube, which is arranged in the first chamber and located on the circumference of the centrifugal impeller, and the insulation board is provided with a light-transmitting area corresponding to the light wave heating tube.

[0015] As a preferred embodiment, in one of the present inventions, a reflective cover is provided above the light wave heating tube, and the reflective cover is provided in the first chamber and is located on the peripheral side of the centrifugal impeller.

[0016] As a preferred embodiment, in one of the present inventions, the heating element includes an electromagnetic coil disk, which is arranged in the first chamber and located on the peripheral side of the centrifugal impeller, and the inner cover is a magnetic conductive structure.

[0017] As a preferred embodiment, in one of the present inventions, the heating element also includes a magnetic shield and a magnetic strip group, which are both arranged in the first chamber and located on the circumferential side of the centrifugal impeller. The magnetic shield is arranged above the electromagnetic coil disk, and the magnetic strip group is arranged at the bottom of the electromagnetic coil disk.

[0018] As a preferred embodiment, in one of the present inventions, the thermal insulation board is provided with a perspective area, which is located in the middle of the thermal insulation board and corresponds to the centrifugal impeller.

[0019] The utility model also provides an electric rice cooker, comprising: a cooker body, an inner pot and an upper cover assembly, wherein the inner pot is arranged in the cooker body, the upper cover assembly is hinged to the cooker body, and the upper cover assembly can be covered on the cooker body to form a cooking cavity between the upper cover assembly and the inner pot.

[0020] The beneficial effects of the upper cover assembly and the rice cooker provided by the utility model are as follows:

[0021] The present invention forms a first chamber between the insulation plate and the upper cover, and a second chamber between the insulation plate and the inner cover. The first chamber and the second chamber are connected through the middle portion and the peripheral edge of the insulation plate. When the heating element heats the insulation plate and the air in the first chamber, the rotation of the centrifugal impeller can drive the air in the second chamber to flow through the middle portion of the insulation plate into the first chamber. The centrifugal structure of the centrifugal impeller can drive the air around it to diffuse outward and flow through the peripheral edge of the insulation plate into the second chamber. In this way, during the heating process by the heating device, the air in the first and second chambers can achieve circulatory heat convection, so that the air temperature in the second chamber is uniform, thereby achieving uniform heating of the inner cover, avoiding the formation of a cold end in the inner cover, and preventing the steam in the cooking chamber from forming condensation water on the inner cover, thereby ensuring the taste of the food in the cooking chamber. At the same time, it is convenient to clean the rice cooker and ensure the long-term normal use of the rice cooker. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an exploded view of the upper cover assembly of Example 1;

[0023] Figure 2 is a cross-sectional view of the upper cover assembly of Example 1;

[0024] Figure 3 This is a cross-sectional view of the upper cover assembly of Example 1 with the outer cover removed;

[0025] Figure 4 Schematic diagram of the structure of the insulation plate and the centrifugal impeller of Example 1;

[0026] Figure 5 This is an exploded view of the heating element and the insulation board of Example 2;

[0027] Figure 6 This is an exploded view of the heating element of Example 3;

[0028] Figure 7 It is a structural representation of the electric rice cooker in the open state of Example 4.

[0029] The meanings of the reference numerals are as follows:

[0030] 1. Upper cover; 11. Outer cover; 12. Support cover; 2. Inner cover; 3. Insulation board; 31. Bottom plate; 311. First air outlet; 32. Side plate; 321. Second air outlet; 33. Light-transmitting area; 34. Perspective area; 4. First chamber; 5. Second chamber; 6. Centrifugal impeller; 7. Heating element; 71. Heating wire; 72. Light wave heating tube; 73. Reflection cover; 74. Electromagnetic coil disk; 75. Magnetic shield; 76. Magnetic strip assembly; 8. Motor; 100. Pot body; 200. Inner pot; 300. Upper cover assembly. DETAILED DESCRIPTION

[0031] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0034] Example 1

[0035] See Figure 1-3 This embodiment provides an upper cover assembly, comprising an upper cover 1, an inner cover 2, an insulation board 3, and a heating device. The inner cover 2 is detachably mounted on the inner side of the bottom of the upper cover 1. The upper cover 1 is a semi-enclosed structure, having an internal accommodating cavity and an opening at the lower end. The inner cover 2 is mounted on the opening side of the upper cover 1. The inner cover 2 and the upper cover 1 are connected by a snap-fit ​​structure to achieve detachable installation.

[0036] The insulation board 3 is installed between the upper cover 1 and the inner cover 2. Gaps are provided between the insulation board 3 and both the upper cover 1 and the inner cover 2 to form a first chamber 4 and a second chamber 5, respectively. The first chamber 4 and the second chamber 5 are connected through the middle portion and the circumferential edge of the insulation board 3. The insulation board 3 is arranged inside the upper cover 1. The circumferential edge of the insulation board 3 extends toward the upper cover 1 with a convex structure to enable the insulation board 3 to be snapped into the upper cover 1 and form the first chamber 4 between the insulation board 3 and the upper cover 1. The inner cover 2 is arranged below the insulation board 3 with a gap between the two. The circumferential edge of the inner cover 2 extends radially outward compared to the circumferential edge of the insulation board 3 so that the inner cover 2 covers the insulation board 3 at intervals. Therefore, when the second chamber 5 is formed between the inner cover 2 and the insulation board 3, a gap exists at any part of the inner cover 2 and the insulation board 3.

[0037] The heating device is arranged in the first chamber 4, and the heating device includes a centrifugal impeller 6 and a heating element 7. The heating element 7 is installed on the peripheral side of the centrifugal impeller 6. The centrifugal impeller 6 is installed corresponding to the middle part of the insulation plate 3, so that when it rotates, the first chamber 4 and the second chamber 5 circulate heat convection through the middle part and the peripheral edge of the insulation plate 3.

[0038] The heating element 7 is used to heat the air in the first chamber 4 and the heat-insulating plate 3 , and transfer the heat to the inner cover 2 by means of heat radiation, thereby heating the inner cover 2 .

[0039] The centrifugal impeller 6 is mounted in the first chamber 4 and corresponds to the middle portion of the insulation board 3. The blades of the centrifugal impeller 6 face the insulation board 3, and a gap is provided between the bottom of the centrifugal impeller 6 and the insulation board 3 to prevent the insulation board 3 from affecting the rotation of the centrifugal impeller 6 or damaging the insulation board 3. The middle portion and the peripheral edge of the insulation board 3 are used for air to pass through.

[0040] When the centrifugal impeller 6 rotates, it drives the air in the second chamber 5 to flow through the center of the insulation board 3 toward the first chamber 4. Furthermore, the centrifugal structure of the centrifugal impeller 6 drives the surrounding air to diffuse outward, flowing toward the second chamber through the circumferential edge of the insulation board 3. Thus, while the heating element 7 heats the first chamber 4 and insulation board 3 and transfers the heat to the inner cover 2 via thermal radiation, the air in the first chamber 4 and the second chamber 5 can achieve circulatory thermal convection, thereby uniformizing the temperature of the air in the second chamber 5 and thus achieving uniform heating of the inner cover 2, preventing the formation of localized cold ends in the inner cover 2 and thus preventing the formation of condensed water when steam encounters the inner cover 2.

[0041] See Figure 1The insulation board 3 includes a bottom plate 31 and a side plate 32. The side plate 32 is arranged on the peripheral side of the bottom plate 31 and extends to be fixed to the upper cover 1. A first air outlet 311 is opened in the middle of the bottom plate 31, and a plurality of second air outlets 321 are opened at intervals on the side plate 32 to connect the first chamber 4 and the second chamber 5 through the first air outlet 311 and the second air outlet 321.

[0042] The bottom plate 31 is spaced apart from both the upper cover 1 and the inner cover 2. The side plates 32 extend from the circumferential edge of the bottom plate 31 toward the upper cover 1. A latching structure extends from the end of the side plates 32 away from the bottom plate 31 toward the upper cover 1, thereby enabling a removable connection between the side plates 32 and the upper cover 1. A first air vent 311 extends through the central region of the bottom plate 31. The shape of the first air vent 311 is adapted to the shape of the blades of the centrifugal impeller 6. Multiple first air vents 311 are spaced apart, thereby enhancing the flow of air from the second chamber 5 to the first chamber 4. Second air vents 321 are spaced around the side plates 32, ensuring that air in the first chamber 4 can diffuse widely and flow smoothly into the second chamber 5. This enhances air convection within the first and second chambers 4, further facilitating uniformity in the air temperature distribution within the second chamber 5. This accelerates the development of a uniform heating temperature within the inner cover 2 and prevents the formation of condensation on the surface of the inner cover 2 during the initial heating phase.

[0043] Among them, the upper cover 1 includes an outer cover 11 and a support cover 12. The support cover 12 is installed in the outer cover 11 so that the first chamber 4 is formed between the support cover 12 and the insulation board 3. A gap is provided between the support cover 12 and the outer cover 11 to accommodate the motor 8. The motor 8 is installed on the support cover 12, and the output shaft of the motor 8 passes through the support cover 12 to connect to the centrifugal impeller 6.

[0044] The outer cover 11 is disposed over the support cover 12, the insulation board 3, and the inner cover 2. The insulation board 3 is removably connected to the support cover 12 via a latching structure, forming a first chamber 4 therebetween. The inner cover 2 is removably connected to the outer cover 11 via a snap-fit ​​structure. A gap exists between the top inner wall of the outer cover 11 and the top of the support cover 12 to accommodate the motor 8, which drives the centrifugal impeller 6.

[0045] In this embodiment, the heating element 7 includes a heating wire 71, which is attached to the upper surface of the insulation board 3 and is located around the centrifugal impeller 6. The attachment of the heating wire 71 to the insulation board 3 facilitates rapid heating of the insulation board 3, thereby accelerating heat transfer from the insulation board 3 to the inner cover 2 via thermal radiation, thereby accelerating the heating rate of the inner cover 2.

[0046] In order to ensure uniform heating and rapid heating, the heating wires 71 are evenly distributed on the upper surface of the insulation plate 3 and need to avoid the centrifugal impeller 6 to avoid affecting the rotation of the centrifugal impeller 6 or damaging the heating wires due to the rotation of the centrifugal impeller 6.

[0047] In addition, see Figure 4 The insulation board 3 is provided with a perspective area 34, which is located in the middle of the insulation board 3 and corresponds to the centrifugal impeller 6. The perspective area 34 can be an integral structure with the insulation board 3 or a detachable structure. The perspective area 34 can be made of high-temperature resistant glass or other components, so that after removing the inner cover 2, the rotation state of the centrifugal impeller 6 can be observed through the perspective area 34, so that timely improvements can be made as needed.

[0048] Of course, the position of the inner cover 2 corresponding to the perspective area 34 can also be partially transparent, so that the rotation state of the centrifugal impeller 6 can be observed without removing the inner cover 2. However, the partial transparency setting needs to ensure that it does not affect the performance and normal use of the inner cover 2.

[0049] Example 2

[0050] See Figure 5 This embodiment also provides an upper cover assembly. The difference between this upper cover assembly and embodiment 1 is that the heating element 7 includes a light wave heating tube 72, which is arranged in the first chamber 4 and located on the peripheral side of the centrifugal impeller 6, and the insulation board 3 is provided with a light-transmitting area 33 corresponding to the light wave heating tube 72.

[0051] The light wave heating tube 72 can be a halogen heating tube or a quartz heating tube, which is fixedly installed in the first chamber 4. Preferably, the light wave heating tube 72 is evenly distributed in the first chamber 4 and avoids the centrifugal impeller 6, the first air outlet 311 and the second air outlet 321 to avoid affecting the rotation of the centrifugal impeller 6, the air flow between the first chamber 4 and the second chamber 5, and avoiding damage to the light wave heating tube 72 by the rotation of the centrifugal impeller 6. When the light wave heating tube 72 is in operation, the light waves generated by the light wave heating tube 72 can directly radiate the entire first chamber 4 and the insulation board 3, thereby heating the air in the first chamber 4 and the insulation board 3, and realizing circulating heat convection of the air in the first chamber 4 and the second chamber 5 under the rotation of the centrifugal impeller 6, so as to heat the inner cover 2 through the heat radiation of the hot air and the insulation board 3.

[0052] On this basis, the area of ​​the insulation board 3 corresponding to the light wave heating tube 72 is set as the light-transmitting area 33, so that the light waves of the light wave heating tube 72 can radiate the air in the second chamber 5 and the inner cover 2 through the light-transmitting area 33, further improving the heating rate and temperature uniformity of the inner cover 2.

[0053] Furthermore, a reflector 73 is provided above the light wave heating tube 72. The reflector 73 is provided in the first chamber 4 and on the circumference of the centrifugal impeller 6. The reflector 73 is provided above the light wave heating tube 72 and can reflect the light waves radiated upward by the light wave heating tube 72 to heat the air in the first chamber 4, the air in the second chamber 5, the insulation board 3, and the inner cover 2. This rapidly improves the heating rate and temperature uniformity of the inner cover 2, thereby achieving rapid and uniform heating of the inner cover 2, avoiding the formation of a cold end in a part of the inner cover 2, and thus preventing steam from encountering the inner cover 2 to form condensed water.

[0054] The light-transmitting area 33 can be part of the bottom plate 31 of the thermal insulation board 3, that is, the light-transmitting area 33 and the bottom plate 31 of the thermal insulation board 3 are integrally formed. Alternatively, the light-transmitting area 33 can be a glass-made light-transmitting plate, and the bottom plate 31 has a mounting hole adapted for the light-transmitting plate, and the light-transmitting area 33 is mounted in the mounting hole to achieve the light transmission function.

[0055] On the basis of this structure, the perspective area 34 can be directly provided on the light-transmitting area 33 to facilitate the rotation state of the centrifugal impeller 6 .

[0056] Example 3

[0057] See Figure 6 This embodiment also provides an upper cover assembly. The difference between this upper cover assembly and embodiment 1 is that the heating element 7 includes an electromagnetic coil disk 74, which is arranged in the first chamber 4 and located on the peripheral side of the centrifugal impeller 6, and the inner cover 2 is a magnetic conductive structure.

[0058] The electromagnetic coil disk 74 includes a coil bracket and a coil arranged on the coil bracket, which is fixedly installed in the first chamber 4. Preferably, the electromagnetic coil disk 74 is evenly distributed in the first chamber 4 and avoids the centrifugal impeller 6, the first air outlet 311 and the second air outlet 321 to avoid affecting the rotation of the centrifugal impeller 6, the air flow between the first chamber 4 and the second chamber 5, and avoiding the rotation of the centrifugal impeller 6 to damage the electromagnetic coil disk 74.

[0059] In this way, the magnetic field generated by the electromagnetic coil disk 74 when it is working can directly radiate the entire first chamber 4, the insulation board 3 and the inner cover 2 of the magnetic conductive structure, thereby heating the air in the first chamber 4, the insulation board 3 and the inner cover 2, and realizing the circulating heat convection of the air in the first chamber 4 and the second chamber 5 under the rotation of the centrifugal impeller 6, so as to heat the inner cover 2 through the heat radiation of the hot air and the insulation board 3, thereby improving the heating rate and temperature uniformity of the inner cover 2.

[0060] On this basis, the heating element 7 also includes a magnetic isolation cover 75 and a magnetic strip group 76. The magnetic isolation cover 75 and the magnetic strip group 76 are both arranged in the first chamber 4 and located on the peripheral side of the centrifugal impeller 6. The magnetic isolation cover 75 is arranged above the electromagnetic coil disk 74, and the magnetic strip group 76 is arranged at the bottom of the electromagnetic coil disk 74.

[0061] The magnetic shield 75 is disposed above the electromagnetic coil disk 74 and can prevent the magnetic field from radiating toward the upper cover 1 so as to collect the magnetic field generated by the electromagnetic coil disk 74 above the magnetic shield 75 , thereby improving the heating efficiency.

[0062] The magnetic stripe group 76 includes multiple magnetic strips, which spread outward from the same center in different directions to form a circular magnetic stripe group 76. The magnetic stripe group 76 can be wrapped under the electromagnetic coil disk 74, thereby cooperating with the electromagnetic coil disk 74 to generate a high-frequency magnetic field, further improving the heating effect.

[0063] In this way, the arrangement of the magnetic shield 75 and the magnetic strip group 76 rapidly increases the heating rate and temperature uniformity of the inner cover 2, thereby achieving rapid and uniform heating of the inner cover 2, avoiding the formation of a cold end locally in the inner cover 2, and thus preventing steam from encountering the inner cover 2 to form condensed water.

[0064] Example 4

[0065] See Figure 7 This embodiment provides an electric rice cooker, including a rice cooker body 100, an inner pot 200 and any upper cover assembly 300 of embodiments 1-3, the inner pot 200 is arranged in the rice cooker body 100, the upper cover assembly 300 is hinged to the rice cooker body 100, and the upper cover assembly 300 can be covered on the rice cooker body 100 to form a cooking cavity between the upper cover assembly 300 and the inner pot 200.

[0066] The outer cover 11 of the upper cover assembly 300 is rotatably connected to the pot body 100 via a hinge structure, so that the upper cover assembly 300 can be closed on the pot body 100 or the cooking cavity can be opened.

[0067] When any of the upper cover assemblies 300 of Examples 1-3 is assembled in an electric rice cooker, the centrifugal impeller 6 rotates, driving the air in the second chamber 5 to flow through the middle of the insulation plate 3 toward the first chamber 4. Furthermore, the centrifugal structure of the centrifugal impeller 6 drives the surrounding air to diffuse in all directions, flowing through the circumferential edge of the insulation plate 3 toward the second chamber. Thus, as the heating element 7 heats the first chamber 4 and the insulation plate 3 and transfers the heat to the inner cover 2 via thermal radiation, the air in the first chamber 4 and the second chamber 5 can achieve circulatory heat convection, uniformizing the air temperature in the second chamber 5. This uniformly heats the inner cover 2, preventing the inner cover 2 from forming a cold end locally. This prevents steam in the cooking chamber from forming condensation on the inner cover, preventing the condensation from dripping into the cooking chamber and affecting the taste of the food. This also prevents the condensation from flowing to any of the rice cooker's components, making it difficult to clean and damaging the rice cooker. This facilitates cleaning of the rice cooker and ensures its long-term normal use.

[0068] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A top cover assembly, characterized in that: include: Upper cover (1); An inner cover (2), the inner cover (2) being detachably mounted on the inner side of the bottom of the upper cover (1); a heat preservation plate (3), the heat preservation plate (3) being installed between the upper cover (1) and the inner cover (2), with gaps being provided between the heat preservation plate (3) and the upper cover (1) and the inner cover (2) to form a first chamber (4) and a second chamber (5), respectively, the first chamber (4) and the second chamber (5) being connected through the middle portion and the circumferential edge of the heat preservation plate (3); A heating device is provided in the first chamber (4), comprising a centrifugal impeller (6) and a heating element (7), wherein the heating element (7) is mounted on the peripheral side of the centrifugal impeller (6), and the centrifugal impeller (6) is mounted corresponding to the middle of the insulation plate (3) so as to circulate heat convection between the first chamber (4) and the second chamber (5) through the middle and peripheral edge of the insulation plate (3) when rotating.

2. The upper cover assembly according to claim 1, wherein: The heat preservation plate (3) comprises a bottom plate (31) and a side plate (32), wherein the side plate (32) is arranged on the peripheral side of the bottom plate (31) and extends to be fixed to the upper cover (1), a first air outlet (311) is provided through the middle of the bottom plate (31), and a plurality of second air outlets (321) are provided through the side plate (32) at intervals, so as to connect the first chamber (4) and the second chamber (5) through the first air outlet (311) and the second air outlet (321).

3. The upper cover assembly according to claim 1, wherein: The upper cover (1) comprises an outer cover (11) and a support cover (12); the support cover (12) is installed in the outer cover (11) so that the first chamber (4) is formed between the support cover (12) and the insulation board (3); a gap is provided between the support cover (12) and the outer cover (11) to accommodate a motor (8); the motor (8) is installed on the support cover (12), and an output shaft of the motor (8) passes through the support cover (12) to connect to the centrifugal impeller (6).

4. The upper cover assembly according to any one of claims 1 to 3, characterized in that: The heating element (7) comprises a heating wire (71), the heating wire (71) is attached to the upper surface of the heat-insulating plate (3), and the heating wire (71) is located on the peripheral side of the centrifugal impeller (6).

5. The upper cover assembly according to any one of claims 1 to 3, characterized in that: The heating element (7) includes a light wave heating tube (72), which is arranged in the first chamber (4) and located on the peripheral side of the centrifugal impeller (6), and the insulation plate (3) is provided with a light-transmitting area (33) corresponding to the light wave heating tube (72).

6. The upper cover assembly according to claim 5, characterized in that: A reflective cover (73) is provided above the light wave heating tube (72), and the reflective cover (73) is provided in the first chamber (4) and is located on the peripheral side of the centrifugal impeller (6).

7. The upper cover assembly according to any one of claims 1 to 3, characterized in that: The heating element (7) comprises an electromagnetic coil disk (74), which is arranged in the first chamber (4) and located on the peripheral side of the centrifugal impeller (6), and the inner cover (2) is a magnetic conductive structure.

8. The upper cover assembly according to claim 7, wherein: The heating element (7) further comprises a magnetic shield (75) and a magnetic stripe group (76), wherein the magnetic shield (75) and the magnetic stripe group (76) are both arranged in the first chamber (4) and located on the peripheral side of the centrifugal impeller (6), the magnetic shield (75) is arranged above the electromagnetic coil disk (74), and the magnetic stripe group (76) is arranged at the bottom of the electromagnetic coil disk (74).

9. The upper cover assembly according to any one of claims 1 to 3, characterized in that: The heat-insulating plate (3) is provided with a perspective area (34), and the perspective area (34) is provided in the middle of the heat-insulating plate (3) and corresponds to the centrifugal impeller (6).

10. An electric rice cooker, characterized in that: include: A pot body (100), an inner pot (200) and an upper cover assembly (300) according to any one of claims 1 to 9, wherein the inner pot (200) is arranged in the pot body (100), the upper cover assembly (300) is hinged to the pot body (100), and the upper cover assembly (300) can be covered on the pot body (100) to form a cooking cavity between the upper cover assembly (300) and the inner pot (200).

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