Microwave cooking electric appliance

Abstract

The invention discloses a microwave cooking electric appliance. The microwave cooking electric appliance comprises a cavity, the cavity is internally provided with a cooking chamber, the cavity comprises a top plate, and the top plate is provided with a through hole communicated with the cooking chamber; the antenna assembly is installed on the top plate and penetrates through the through hole, the antenna assembly comprises an antenna, and the antenna comprises a first antenna part located in the cooking cavity; the heating pipe is installed on the top plate and located in the cooking cavity, and the minimum horizontal distance between the first antenna part and the heating pipe is not smaller than 30 mm. In the microwave cooking electric appliance, the minimum horizontal distance between the first antenna part positioned on the top plate and the heating tube is not less than 30mm, so that the distance between the first antenna part and the heating tube meets the temperature requirement of the antenna, and the performance of the antenna assembly is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and particularly relates to a microwave cooking appliance. Background Art

[0002] Cooking appliances with microwave baking or microwave steaming and baking integrated have a microwave module and a heating module. The microwave module can feed microwaves into the cooking cavity through an antenna assembly to heat food, and the heating module can heat the air in the cooking cavity with a heating tube in the cooking cavity to further heat the food. When the heating tube works, its temperature is relatively high. The heating tube with a relatively high temperature may cause deformation of some components of the antenna assembly, thereby causing a decrease in the matching degree of the antenna assembly and affecting the performance of the antenna assembly. Summary of the Invention

[0003] The present invention provides a microwave cooking appliance to solve at least one of the above-mentioned technical problems.

[0004] A microwave cooking appliance of the present invention includes:

[0005] A cavity, a cooking cavity is provided in the cavity, the cavity includes a top plate, and the top plate is provided with a through hole communicating with the cooking cavity;

[0006] An antenna assembly, the antenna assembly is installed on the top plate and penetrates through the through hole, the antenna assembly includes an antenna, and the antenna includes a first antenna part located in the cooking cavity;

[0007] A heating tube, the heating tube is installed on the top plate and is located in the cooking cavity, and the minimum horizontal distance between the first antenna part and the heating tube is not less than 30 mm.

[0008] In the above microwave cooking appliance, the minimum horizontal distance between the first antenna part located on the top plate and the heating tube is not less than 30 mm, so that the distance between the first antenna part and the heating tube meets the temperature requirement of the antenna, ensuring the performance of the antenna assembly.

[0009] In an optional technical solution of the present invention, the heating tube encloses a heating area, and the first antenna part is located in the heating area.

[0010] In an optional technical solution of the present invention, at least two of the first antenna parts are provided in the heating area.

[0011] In an optional technical solution of the present invention, two antenna assemblies are installed on the top plate, and the two antenna assemblies are arranged symmetrically left and right along the central axis of the cavity.

[0012] In an alternative technical solution of the present invention, the cavity includes a plurality of side plates, and the plurality of side plates enclose the cooking chamber. The plurality of side plates include the top plate. The side plate includes a metal plate and an insulating layer, and the insulating layer covers the surface of the metal plate facing the cooking chamber. The surface of the metal plate of the top plate facing away from the cooking chamber is not covered by the insulating layer.

[0013] In an alternative technical solution of the present invention, the surface of the metal plate of the top plate facing away from the cooking chamber includes a processed area, and the through hole has an opening in the processed area, and the processed area is an area processed by a powder suction process.

[0014] In an alternative technical solution of the present invention, along the vertical direction, the distance between the bottom surface of the first antenna part and the heating tube is not greater than 5 mm above the heating tube or not greater than 20 mm below the heating tube.

[0015] In an alternative technical solution of the present invention, along the horizontal direction, the orthogonal projection of the bottom surface of the first antenna part on the heating tube is located within the contour of the heating tube.

[0016] In an alternative technical solution of the present invention, the antenna assembly includes a housing and an insulating member. An accommodation cavity is provided in the housing. The antenna includes a second antenna part located in the accommodation cavity. The insulating member is located in the accommodation cavity. The insulating member separates the second antenna part from the side wall of the accommodation cavity, and the operating temperature of the insulating member is not less than 400 degrees Celsius.

[0017] In an alternative technical solution of the present invention, the insulating member includes a ceramic member.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0020] Figure 1 is a schematic structural diagram of a microwave cooking appliance according to an embodiment of the present invention;

[0021] Figure 2 is Figure 1 an enlarged view of part A of the microwave cooking appliance;

[0022] Figure 3 Another structural schematic diagram of the microwave cooking appliance according to an embodiment of the present invention;

[0023] Figure 4 Schematic diagram of the position of the heating tube and the first antenna part according to an embodiment of the present invention;

[0024] Figure 5 Partial cross-sectional schematic diagram of the side plate according to an embodiment of the present invention;

[0025] Figure 6 Cross-sectional schematic diagram of the microwave cooking appliance according to an embodiment of the present invention;

[0026] Figure 7 Structural schematic diagram of the antenna assembly according to an embodiment of the present invention;

[0027] Figure 8 Cross-sectional schematic diagram of the antenna assembly according to an embodiment of the present invention;

[0028] Figures 9 to 10 Enlarged cross-sectional schematic diagram of the microwave cooking appliance according to an embodiment of the present invention;

[0029] Figure 11 For Figure 6 Enlarged view of part B of the microwave cooking appliance.

[0030] Explanation of reference numerals:

[0031] Microwave cooking appliance 100, cavity 12, antenna assembly 14, heating tube 16, cooking chamber 18, top plate 20, through hole 22, antenna 24, first antenna part 26, first straight segment 27, second straight segment 28, third straight segment 30, bending segment 32, heating area 34, first heating tube 36, second heating tube 38, first heating area 40, second heating area 42, metal plate 44, insulating layer 46, left side plate 48, right side plate 50, front plate 52, back plate 54, bottom plate 56, housing 58, insulating member 60, accommodating cavity 62, second antenna part 63, area to be processed 64, opening 65, connecting part 66, head 68, frustum part 70, cylindrical part 72. Detailed description of specific embodiments

[0032] The following describes in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection. It may be a mechanical connection or an electrical connection. It may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0036] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0037] Please refer Figures 1 to 4 , a microwave cooking appliance 100 provided by an embodiment of the present invention includes a cavity 12, an antenna assembly 14, and a heating tube 16. A cooking chamber 18 is provided in the cavity 12. The cavity 12 includes a top plate 20, and the top plate 20 is provided with a through hole 22 communicating with the cooking chamber 18. The antenna assembly 14 is mounted on the top plate 20 and passes through the through hole 22. The antenna assembly 14 includes an antenna 24, and the antenna 24 includes a first antenna portion 26 located in the cooking chamber 18. The heating tube 16 is mounted on the top plate 20 and is located in the cooking chamber 18. The minimum horizontal distance between the first antenna portion 26 and the heating tube 16 is not less than 30 mm (millimeters).

[0038] In the above microwave cooking appliance 100, the minimum horizontal distance between the first antenna portion 26 located on the top plate 20 and the heating tube 16 is not less than 30 mm, so that the distance between the first antenna portion 26 and the heating tube 16 meets the temperature requirements of the antenna 24, ensuring the performance of the antenna assembly 14.

[0039] Specifically, the microwave cooking appliance 100 includes, but is not limited to, a microwave oven, a microwave grill, and a microwave steam oven combination. The microwave cooking appliance 100 may include a microwave source, and the microwave source includes, but is not limited to, a magnetron, a radio frequency module, etc. The antenna 24 may be connected to the microwave source. When the microwave source operates, the microwave source can generate microwaves, and the microwaves are fed into the cooking chamber 18 through the antenna 24 to heat the food located in the cooking chamber 18.

[0040] The antenna assembly 14 is mounted on the cavity 12, and a part of the antenna 24 extends into the cooking chamber 18. The part of the antenna 24 extending into the cooking chamber 18 is the first antenna portion 26. The heating tube 16 is spaced from the first antenna portion 26. The horizontal distance may refer to the distance between the outer contour of the first antenna portion 26 and the outer contour of the heating tube 16 in the horizontal direction. Please refer to Figure 3 and Figure 4, in one embodiment, the heating tube 16 is arranged around the first antenna part 26, and there are multiple horizontal distances between the first antenna part 26 and the heating tube 16. The minimum value of these horizontal distances is not less than 30 mm, ensuring that when the heating tube 16 is working, its temperature has less impact on the antenna 24, making the distance between the first antenna part 26 and the heating tube 16 meet the temperature requirements of the antenna 24 and ensuring the performance of the antenna assembly 14.

[0041] The minimum horizontal distance between the first antenna part 26 and the heating tube 16 is not less than 30 mm. In some examples, the minimum horizontal distance between the first antenna part 26 and the heating tube 16 can be 30 mm, 32 mm, 34 mm, 36 mm, 38 mm, 40 mm, 42 mm, 44 mm, 46 mm, 48 mm, 50 mm or other values not less than 30 mm. The upper limit of the minimum horizontal distance between the first antenna part 26 and the heating tube 16 can be determined according to empirical values, actual requirements or other factors, and will not be specifically limited here.

[0042] Please combine Figure 4 , the first antenna part 26 has a circular outer contour, and the heating tube 16 has a first straight segment 27, a second straight segment 28, a third straight segment 30 and a bending segment 32. The first straight segment 27 is located on the left side of the first antenna part 26, the second straight segment 28 is located on the front side of the first antenna part 26, the third straight segment 30 is located on the rear side of the first antenna part 26, and the bending segment 32 is located on the right side of the first antenna part 26.

[0043] On the left side of the first antenna part 26, the horizontal distance between the first antenna part 26 and the first straight segment 27 is D1. Along the front-to-back direction, D1 first decreases and then increases. The minimum value of D1 is not less than 30 mm.

[0044] On the front side of the first antenna part 26, the horizontal distance between the first antenna part 26 and the second straight segment 28 is D2. Along the left-to-right direction, D2 first decreases and then increases. The minimum value of D2 is not less than 30 mm.

[0045] On the rear side of the first antenna part 26, the horizontal distance between the first antenna part 26 and the third straight segment 30 is D3. Along the right-to-left direction, D3 first decreases and then increases. The minimum value of D3 is not less than 30 mm.

[0046] On the right side of the first antenna part 26, the horizontal distance between the first antenna part 26 and the bending segment 32 is D4. Along the front-to-back direction, D4 remains unchanged, or first decreases and then increases, or first increases and then decreases or other regular or irregular changes. The minimum value of D4 is not less than 30 mm. The minimum value of D1, D2, D3 and D4 is not less than 30 mm.

[0047] The present invention does not specifically limit the shape and material of the antenna 24. In one example, the antenna 24 can be made of copper and gold-plated on the copper to ensure the service life of the antenna 2414. The antenna 24 can be cylindrical, or composed of cylinders with different diameters connected together or other forms of structures, which are not specifically limited herein.

[0048] Optionally, the microwave cooking appliance 100 has a barbecue mode. In the barbecue mode, the heating tube 16 can be turned on to heat the food in the cooking chamber 18.

[0049] Optionally, the antenna assembly 14 can be detachably mounted on the cavity 12 to facilitate the installation and maintenance of the antenna assembly 14. The detachable mounting methods include but are not limited to threaded connection, snap connection, interference fit, etc.

[0050] In some embodiments, the heating tubes 16 enclose a heating area 34, and the first antenna part 26 is located within the heating area 34.

[0051] In this way, the space configuration of the cavity 12 can be optimized.

[0052] Specifically, the first antenna part 26 is located within the heating area 34 enclosed by the heating tubes 16, which can make full use of the space within the cavity 12, reduce the additional space for installing the antenna assembly 14, and further optimize the space configuration of the cavity 12, enabling the realization of a miniaturized microwave cooking appliance 100.

[0053] In Figure 3 , a first heating tube 36 and a second heating tube 38 are provided in the cooking chamber 18. The first heating tube 36 is closer to the outer side of the cavity 12 than the second heating tube 38. The first heating tube 36 encloses a first heating area 40, the second heating tube 38 encloses a second heating area 42, a part of the first heating area 40 overlaps with the second heating area 42, and the first antenna part 26 is located within the second heating area 42.

[0054] In some embodiments, at least two first antenna parts 26 are provided within the heating area 34.

[0055] In this way, the heating efficiency and heating uniformity can be improved.

[0056] Specifically, at least two first antenna parts 26 are provided within the heating area 34, that is, at least two antenna assemblies 14 can be mounted on the cavity 12. The at least two first antenna parts 26 can be separately arranged according to the position requirements, increasing the microwave channels fed into the cooking chamber 18, and thus the heating efficiency can be improved.

[0057] The first antenna parts 26 at different positions can feed microwaves into different positions of the cooking chamber 18, and thus different positions of the food can be heated, improving the heating uniformity of the food.

[0058] In Figure 3 it, two first antenna parts 26 are provided in a second heating area 42 surrounded by a second heating tube 38. It can be understood that the number of antenna assemblies 14 installed on the cavity 12 is not limited to two, and can also be one or more than two, which is not specifically limited herein.

[0059] In some embodiments, two antenna assemblies 14 are installed on the top plate 20, and the two antenna assemblies 14 are arranged symmetrically about the central axis L of the cavity 12.

[0060] Thus, the heating uniformity of the food can be further improved.

[0061] Specifically, when heating the food, the food is usually placed at the middle position of the cooking chamber 18. The two antenna assemblies 14 are arranged symmetrically about the central axis L of the cavity 12, so that the microwave can heat the food from the left and right sides of the food. When the number of antenna assemblies 14 is increased, further configuring the positions of the two antenna assemblies 14 can further improve the heating uniformity of the food.

[0062] In some embodiments, the cavity 12 includes a plurality of side plates, the plurality of side plates enclose the cooking chamber 18, and the plurality of side plates include the top plate 20. Please refer to Figure 5 , the side plate includes a metal plate 44 and an insulating layer 46, the insulating layer 46 covers the surface of the metal plate 44 facing the cooking chamber 18, and the surface of the metal plate 44 of the top plate 20 facing away from the cooking chamber 18 is not covered by the insulating layer 46.

[0063] Thus, it can be ensured that the housing 58 of the antenna assembly 14 can be grounded.

[0064] Specifically, in Figure 1 it, the plurality of side plates may include a left side plate 48, a right side plate 50, a front plate 52, a back plate 54, a top plate 20 and a bottom plate 56. To prevent the microwave from being fed into the cooking chamber 18 and causing a sparking phenomenon, an insulating layer 46 is provided on the surface of the metal plate 44 facing the cooking chamber 18.

[0065] The antenna assembly 14 may include a housing 58 and an insulating member 60. A receiving cavity 62 is provided in the housing 58. The antenna 24 includes a second antenna part 63 located in the receiving cavity 62. The insulating member 60 is located in the receiving cavity 62 and separates the second antenna part 63 from the side wall of the receiving cavity 62. The housing 58 is a metal housing 58. The antenna assembly 14 is arranged on the top plate 20. The surface of the metal plate 44 of the top plate 20 facing away from the cooking chamber 18 is not covered by the insulating layer 46. The metal housing 58 can be connected to the metal plate 44 of the top plate 20, which is convenient for the housing 58 to be grounded through the metal plate 44 of the top plate 20. In one example, the metal plate 44 can be stainless steel.

[0066] In some embodiments, the surface of the metal plate 44 of the top plate 20 facing away from the cooking chamber 18 includes a processed area 64, and the through hole 22 has an opening 65 formed in the processed area 64, and the processed area 64 is an area processed by a powder suction process.

[0067] In this way, the powder suction process can be performed on the area where the through hole 22 forms the opening 65 in the top plate 20 so that the metal plate 44 of the top plate 20 is exposed in the area near the opening 65 of the through hole 22, facilitating the grounding of the housing 58 of the antenna assembly 14.

[0068] Specifically, in one embodiment, an enamel process can be used to form the insulating layer 46. More specifically, a structure without the insulating layer 46 can be formed by bending and welding a plurality of metal plates 44 first, and this structure encloses the cooking chamber 18, and then a powdered insulating material is sprayed on the surface of the metal plate 44 facing the cooking chamber 18 inside the cooking chamber 18.

[0069] Since the through hole 22 is provided in the metal plate 44 of the top plate 20, when spraying powder, the powdered insulating material will be ejected out of the cooking chamber 18 through the through hole 22 and adhere to the surface of the metal plate 44 facing away from the cooking chamber 18. Therefore, before sintering, it is necessary to perform a powder suction process on the surface area of the metal plate 44 facing away from the cooking chamber 18 near the opening 65 of the through hole 22 to remove the powdered insulating material. After sintering, the insulating material adsorbed on the surface of the metal plate 44 facing the cooking chamber 18 forms the insulating layer 46, and the area processed by the powder suction process (processed area 64) is not covered by the insulating layer 46, which is beneficial to the connection between the housing 58 of the antenna assembly 14 and the metal plate 44.

[0070] In some embodiments, in the vertical direction, the distance from the bottom surface of the first antenna portion 26 to the heating tube 16 is not greater than 5 mm or the distance below the heating tube 16 is not greater than 20 mm.

[0071] In this way, it is possible to prevent the heating tube 16 from affecting the matching of the antenna assembly 14 and to prevent the antenna 24 from being easily damaged.

[0072] Specifically, the antenna assembly 14 is installed on the top plate 20 of the cavity 12, and the antenna 24 emits microwaves downward from the top of the cooking chamber 18. If there is a metal block such as a transmitting tube below the antenna 24, this may affect the microwave energy emitted by the antenna 24. Therefore, in the vertical direction, the distance from the bottom surface of the first antenna portion 26 to the heating tube 16 is not greater than 5 mm, so that the influence of the heating tube 16 on the microwave energy emitted by the antenna 24 will be reduced, avoiding the heating tube 16 from affecting the matching of the antenna assembly 14. Please refer to Figure 9, the bottom surface of the first antenna portion 26 is located above the heating tube 16, and the distance D5 between the bottom surface of the first antenna portion 26 and the heating tube 16 is D5 ≤ 5 mm. In some examples, D5 can be 5 mm, 4 mm, 3 mm, 2 mm, 1 mm, 0 mm, or other values not greater than 5 mm.

[0073] Vertically, the distance by which the bottom surface of the first antenna portion 26 is lower than the heating tube 16 is not greater than 20 mm, which can prevent the first antenna portion 26 extending into the cooking chamber 18 from being too long and being easily damaged, and thus can ensure the service life of the antenna assembly 14. Please refer to Figure 10 , the bottom surface of the first antenna portion 26 is located below the heating tube 16, and the distance D6 between the bottom surface of the first antenna portion 26 and the heating tube 16 is D6 ≤ 20 mm. In some examples, D6 can be 20 mm, 15 mm, 10 mm, 5 mm, 0 mm, or other values not greater than 20 mm.

[0074] In some embodiments, please combine Figure 6 and Figure 11 , horizontally, the orthographic projection of the bottom surface of the first antenna portion 26 on the heating tube 16 is located within the contour of the heating tube 16.

[0075] In this way, the performance of the antenna assembly 14 can be ensured and the antenna assembly 14 can be protected.

[0076] Specifically, horizontally, the orthographic projection of the bottom surface of the first antenna portion 26 on the heating tube 16 is located within the contour of the heating tube 16, that is, vertically, the bottom surface of the first antenna portion 26 does not extend beyond the upper and lower sides of the heating tube 16. On the one hand, the bottom surface of the first antenna portion 26 does not extend beyond the upper side of the heating tube 16 upward, and the microwave energy fed by the antenna 24 will not be blocked by the heating tube 16 or will be blocked less by the heating tube 16, ensuring the performance of the antenna assembly 14.

[0077] On the other hand, the bottom surface of the first antenna portion 26 does not extend beyond the lower side of the heating tube 16 downward, and the bottom surface of the first antenna portion 26 does not protrude downward beyond the heating tube 16, so that it is not easy for users to touch the first antenna portion 26 when taking and placing food or for maintenance personnel during maintenance, and thus the antenna assembly 14 can be protected.

[0078] In some embodiments, please combine Figure 8 , the antenna assembly 14 includes a housing 58 and an insulating member 60. An accommodation cavity 62 is provided in the housing 58. The antenna 24 includes a second antenna portion 63 located in the accommodation cavity 62. The insulating member 60 is located in the accommodation cavity 62. The insulating member 60 separates the second antenna portion 63 from the side wall of the accommodation cavity 62, and the operating temperature of the insulating member 60 is not less than 400 degrees Celsius.

[0079] In this way, when the heating tube 16 is working, the insulating member 60 can be used normally without deformation, thereby ensuring the performance of the antenna assembly 14.

[0080] Specifically, the insulating member 60 can separate the housing 58 and the second antenna portion 63, electrically isolating the housing 58 and the antenna 24. The first antenna portion 26 is located outside the accommodation cavity 62, and the first antenna portion 26 is connected to the second antenna portion 63. Figure 7 In, the antenna 24 includes a connecting portion 66 and a head portion 68. The connecting portion 66 is partially located inside the accommodation cavity 62, and the head portion 68 is connected to one end of the connecting portion 66 located outside the accommodation cavity 62. The second antenna portion 63 is the portion of the connecting portion 66 located inside the accommodation cavity 62. The other portion of the connecting portion 66 located outside the accommodation cavity 62 and the head portion 68 form the first antenna portion 26.

[0081] Optionally, the connecting portion 66 is cylindrical, and the head portion 68 includes a frustum portion 70 and a cylindrical portion 72. The connecting portion 66 is connected to the small end of the frustum portion 70, and the large end of the frustum portion 70 is connected to the cylindrical portion 72. The diameter of the cylindrical portion 72 is greater than the diameter of the connecting portion 66. It can be understood that in other embodiments, the antenna 24 is not limited to the above structural form and can also be other structural forms, which are not specifically limited herein.

[0082] In the barbecue mode, the heating tube 16 can be energized for heating. When the heating tube 16 is heating, the core temperature of the cavity 12 is relatively high. The working temperature of the insulating member 60 is not less than 400 degrees Celsius. In the barbecue mode, the insulating member 60 can be used normally without deformation, avoiding the inclination of the antenna 24 caused by the deformation of the insulating member 60. The inclination of the antenna 24 can cause a change in the original matching between the antenna 24 and the insulating member 60, thereby affecting the performance of the antenna assembly 14. The working temperature can refer to the temperature at which the insulating member 60 can be used normally without deformation, thus avoiding affecting the performance of the antenna assembly 14.

[0083] In some examples, the working temperature of the insulating member 60 can be 400 degrees Celsius, 420 degrees Celsius, 440 degrees Celsius, 460 degrees Celsius, 480 degrees Celsius, 500 degrees Celsius, or other temperatures not less than 400 degrees Celsius. The upper limit of the working temperature of the insulating member 60 can be determined according to the performance of the microwave cooking appliance 100, empirical values, or other factors.

[0084] Optionally, the insulating member 60 separates the second antenna portion 63 and the side wall of the accommodation cavity 62 by 360 degrees in the circumferential direction of the antenna assembly 14. In this way, the electrical isolation between the antenna 24 and the housing 58 is more uniform.

[0085] Optionally, the insulating member 60 is connected to the second antenna portion 63 and the side wall of the accommodation cavity 62, so that the second antenna portion 63 can be more firmly installed in the accommodation cavity 62.

[0086] In some embodiments, the insulating member 60 includes a ceramic member.

[0087] In this way, the performance of the antenna assembly 14 can be further ensured.

[0088] Specifically, when the ceramic member is heated, it will not deform at the working temperature, and the ceramic member is easy to obtain and has a slow aging rate, which can further ensure the performance of the antenna assembly 14 and also reduce the cost of the antenna assembly 14.

[0089] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0090] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A microwave cooking appliance, characterized in that, Comprising: A cavity, within which a cooking chamber is provided. The cavity includes a top plate, and a through hole communicating with the cooking chamber is formed in the top plate. An antenna assembly, which is mounted on the top plate and passes through the through hole. The antenna assembly includes an antenna, and the antenna includes a first antenna portion located within the cooking chamber. A heating tube, which is mounted on the top plate and located within the cooking chamber. The minimum horizontal distance between the first antenna portion and the heating tube is not less than 30 mm.

2. The microwave cooking appliance according to claim 1, wherein, The heating tube encloses a heating area, and the first antenna portion is located within the heating area.

3. The microwave cooking appliance according to claim 2, wherein At least two of the first antenna portions are provided within the heating area.

4. The microwave cooking appliance according to claim 1, wherein, Two of the antenna assemblies are mounted on the top plate, and the two antenna assemblies are arranged symmetrically about the central axis of the cavity in the left-right direction.

5. The microwave cooking appliance according to claim 1, characterized in that, The cavity includes a plurality of side plates, and the plurality of side plates enclose the cooking chamber. The plurality of side plates include the top plate. The side plate includes a metal plate and an insulating layer, and the insulating layer covers the surface of the metal plate facing the cooking chamber. The surface of the metal plate of the top plate facing away from the cooking chamber is not covered by the insulating layer.

6. The microwave cooking appliance according to claim 5, wherein, The surface of the metal plate of the top plate facing away from the cooking chamber includes a treated area, and the through hole has an opening in the treated area. The treated area is an area treated by a powder absorption process.

7. The microwave cooking appliance according to claim 1, wherein, In the vertical direction, the distance from the bottom surface of the first antenna portion to the heating tube is not greater than 5 mm, or the distance from the bottom surface of the first antenna portion below the heating tube is not greater than 20 mm.

8. The microwave cooking appliance according to claim 1, wherein, In the horizontal direction, the orthographic projection of the bottom surface of the first antenna portion on the heating tube is located within the contour of the heating tube.

9. The microwave cooking appliance according to claim 1, wherein, The antenna assembly includes a housing and an insulating member. An accommodation cavity is provided within the housing. The antenna includes a second antenna portion located within the accommodation cavity. The insulating member is located within the accommodation cavity, and the insulating member separates the second antenna portion from the side wall of the accommodation cavity. The operating temperature of the insulating member is not less than 400 degrees Celsius.

10. The microwave cooking appliance according to claim 9, wherein The insulating member includes a ceramic member.

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