Antenna structure and microwave cooking electric appliance

Abstract

The utility model discloses an antenna structure and a microwave cooking electric appliance. The antenna structure is used for the microwave cooking electric appliance, and the antenna structure comprises a waveguide tube which is provided with a microwave output port; and the feed port piece is installed at the microwave output port, the feed port piece is provided with a plurality of slot feed ports, the plurality of slot feed ports comprise a first slot feed port, and the first slot feed port is arranged at a voltage antinode point of the waveguide tube. In the antenna structure, the first slot feed port is arranged at the voltage antinode port of the waveguide tube, and the first slot feed port can adjust the electric field fed into the cooking cavity of the microwave cooking electric cavity to meet the requirement of uniform distribution of microwaves, so that the use of components such as a motor and a stirring support can be reduced, the structure of the antenna structure is simplified, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, and particularly relates to an antenna structure and a microwave cooking appliance. Background Art

[0002] In the related art, the microwave heating principle of a microwave cooking appliance is that a magnetron generates microwaves, the microwaves are transmitted to the cavity of a cooking appliance through a waveguide, and then an antenna rotates to stir the microwaves driven by a bottom motor so as to heat food more evenly. However, the above microwave antenna stirring system includes components such as an antenna, a motor, and a stirring support, with a complex structure and a relatively high overall cost. Summary of the Utility Model

[0003] Embodiments of the utility model provide an antenna structure and a microwave cooking appliance to solve at least one of the above technical problems.

[0004] An antenna structure provided by an embodiment of the utility model is used for a microwave cooking appliance, and the antenna structure includes:

[0005] A waveguide provided with a microwave output port;

[0006] A feed port sheet installed at the microwave output port, the feed port sheet being provided with a plurality of slot feeds, the plurality of slot feeds including a first slot feed provided at a voltage antinode of the waveguide.

[0007] In the above antenna structure, the first slot feed is provided at the voltage antinode of the waveguide. The first slot feed can adjust the electric field in the cooking cavity fed into the microwave cooking cavity to meet the uniform distribution of microwaves, thereby reducing the use of components such as motors and stirring supports, simplifying the structure of the antenna structure, and reducing costs.

[0008] In some embodiments, the plurality of slot feeds includes a second slot feed provided at a current antinode of the waveguide.

[0009] In some embodiments, the waveguide includes an input part and an output part connected to each other. The input part is provided with a microwave input port, the output part is provided with the microwave output port. The width of the output part is W2 and the length is L2. The voltage antinode of the waveguide is arranged along the axis of W2×1 / 2, and the current antinodes of the waveguide are arranged along the axes of L2×1 / 3 and L2×2 / 3.

[0010] In some embodiments, W2 is 65 mm to 200 mm and L2 is 150 mm to 220 mm.

[0011] In some embodiments, the width of the input part is W1, and W1 ranges from 65 mm to 95 mm.

[0012] In some embodiments, the width of the slot feed is W3, and the length is L3, where L3 ranges from 45 mm to 70 mm and W3 ranges from 12 mm to 30 mm.

[0013] A microwave cooking appliance according to an embodiment of the present utility model includes the antenna structure of any of the above embodiments.

[0014] In the above microwave cooking appliance, the first slot feed is provided at the voltage antinode of the waveguide. The first slot feed can adjust the electric field in the cooking cavity of the microwave cooking cavity to which the microwave is fed to meet the uniform distribution of the microwave, thereby reducing the use of components such as motors and stirring supports, simplifying the structure of the antenna structure, and reducing costs.

[0015] In some embodiments, the microwave cooking appliance includes a cooking cavity, the feed port piece is provided on at least one of the top plate, the bottom plate, and the side plate of the cooking cavity, and the side plate of the cooking cavity is connected to the top plate and the bottom plate of the cooking cavity.

[0016] In some embodiments, the microwave cooking appliance includes a microwave generating assembly and an electrical chamber. The electrical chamber is located on the side of the cooking cavity, and the microwave generating assembly is located in the electrical chamber and connected to the waveguide.

[0017] In some embodiments, the microwave cooking appliance includes a cooling fan. The cooling fan is located in the electrical chamber, and the cooling fan is used to cool the microwave generating assembly.

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

[0019] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is an exploded schematic view of a microwave cooking appliance according to an embodiment of the present utility model;

[0021] Figures 2 to 5 is a schematic structural view of a feed port piece according to an embodiment of the present utility model;

[0022] Figure 6 is a schematic view of the quadrant division of a feed port piece according to an embodiment of the present utility model;

[0023] Figures 7 to 14It is a schematic structural diagram of a feed port piece according to an embodiment of the present utility model;

[0024] Figure 15 It is a schematic diagram of a waveguide mode conversion structure and an electric field distribution according to an embodiment of the present utility model;

[0025] Figure 16 It is a schematic cross-sectional view of a microwave cooking appliance in the related art.

[0026] Description of the main component reference numerals:

[0027] Antenna structure 100, microwave cooking appliance 200, waveguide 12, feed port piece 14, microwave output port 16, slot feed 18, first slot feed 20, cooking cavity 22, microwave generating assembly 24, cooking chamber 26, top plate 28, side plate 30, bottom plate 32, through hole 34, second slot feed 36, input part 37, output part 38, microwave input port 40, electrical chamber 42, magnetron 44, frequency converter 46, inner partition 48, depression 50, opening 52, cooling fan 54. Specific embodiments

[0028] The following describes in detail the embodiments of the present utility model. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0029] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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, and thus should not be construed as a limitation to the present utility model. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0030] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection" and "coupling" shall be understood 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 a direct connection or an indirect connection through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the non-direct contact between the first and second features but 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 indicates that the first feature is at a higher level than the second feature in terms of horizontal height. The first feature being "below", "beneath" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature in terms of horizontal height.

[0032] The present disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, the components and settings of specific examples are described herein. Of course, they are merely examples and are not intended to limit the present utility model. In addition, the present utility model 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 utility model provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0033] In the related art, as Figure 16 shown in the internal structure diagram of a flat microwave oven, there is a waveguide 400 and a stirrer antenna system at the bottom of the cavity. The waveguide 400 is riveted to the cavity 500, and the magnetron is fixed to the waveguide by screws. When the microwave oven works, the magnetron generates microwaves and transmits them into the cavity through the waveguide. The bottom motor drives the stirrer antenna 600 to rotate continuously, so that the microwave field inside the cavity 500 is disturbed.

[0034] The microwave heating principle of a microwave cooking appliance is that a magnetron generates microwaves, which are transmitted to the cavity of the cooking appliance through a waveguide, and then a bottom motor drives a stirring antenna 600 to rotate and stir the microwaves, so as to make the food heating more uniform. However, the above microwave antenna stirring system includes components such as a stirring antenna 600, a motor, and a stirring support, with a complex structure and a relatively high overall cost. Moreover, the overall thickness of the microwave stirring system is relatively high, about 110 mm, occupying more bottom space and having a small volume ratio of the whole machine.

[0035] Please refer to Figures 1 to 5 , an antenna structure 100 provided by an embodiment of the present utility model is used for a microwave cooking appliance 200. The antenna structure 100 includes a waveguide 12 and a feed port piece 14. The waveguide 12 is provided with a microwave output port 16, the feed port piece 14 is installed at the microwave output port 16, the feed port piece 14 is provided with a plurality of slot feeds 18, and the plurality of slot feeds 18 includes a first slot feed 20, and the first slot feed 20 is arranged at the voltage antinode of the waveguide 12.

[0036] In the above antenna structure 100, the first slot feed 20 is arranged at the voltage antinode of the waveguide 12. The first slot feed 20 can adjust the electric field in the cooking cavity 26 of the microwave cooking cavity into which the microwave is fed to meet the uniform distribution of the microwave, so that the use of components such as a motor and a stirring support can be reduced, the structure of the antenna structure 100 is simplified, and the cost is reduced.

[0037] Specifically, the antenna structure 100 can be applied to a microwave cooking appliance 200, and the microwave cooking appliance 200 includes, but is not limited to, a microwave oven, a microwave oven, a microwave steam oven, an integrated stove, etc. The microwave cooking appliance 200 includes a cooking cavity 22 and a microwave generating component 24. A cooking cavity 26 is arranged in the cooking cavity 22, food ingredients can be placed in the cooking cavity 26, and microwaves can be fed into the cooking cavity 26 through the slot feeds 18 to heat the food ingredients in the cooking cavity 26.

[0038] The feed port piece 14 can be arranged on at least one of the top plate 28, the side plate 30, and the bottom plate 32 of the cooking cavity 22, and the waveguide 12 can be provided with a corresponding microwave output port 16. In Figure 1 , the feed port piece 14 is arranged on the top plate 28 of the cooking cavity 22. Specifically, the top plate 28 of the cooking cavity 22 is provided with a through hole 34, the feed port piece 14 can cover the through hole 34, and the waveguide 12 can be connected to the outer side surface of the top plate 28 and cover the through hole 34. The microwave generating component 24 is connected to the waveguide 12. When the microwave generating component 24 operates, it can generate microwaves. The microwaves are conducted to the feed port piece 14 through the waveguide 12, and the microwaves are fed into the cooking cavity 26 by the slot feeds 18.

[0039] In some embodiments, the embodiments of the present utility model can solve the problem of excessive volume of the bottom electrical compartment effectively and increase the volume utilization rate of the whole machine by about 20% by arranging a multi-feed port source at the top or bottom of the cooking cavity 22, and only stretching the bottom of the cooking cavity 22 by less than 15 mm without reserving the thickness of the stirring antenna and the motor (about 50 mm).

[0040] After the structural dimensions of the waveguide 12 are determined, the voltage antinode of the waveguide 12 can be determined by means of simulation or the like, so that the first slot feed port 20 can be arranged at the voltage antinode of the waveguide 12. The first slot feed port 20 located at the voltage antinode of the waveguide 12 can adjust the electric field uniformity in the cooking cavity 26. The position and size of the first slot feed port 20 corresponding to meeting the electric field uniformity requirement can be determined by simulation.

[0041] In some embodiments, the plurality of slot feed ports 18 include a second slot feed port 36, and the second slot feed port 36 is arranged at the current antinode of the waveguide 12.

[0042] Thus, the microwave cooking appliance 200 can meet the energy efficiency requirement.

[0043] Specifically, after the structural dimensions of the waveguide 12 are determined, the current antinode of the waveguide 12 can be determined by means of simulation or the like, so that the second slot feed port 36 can be arranged at the current antinode of the waveguide 12. The second slot feed port 36 located at the current antinode of the waveguide 12 can adjust the energy efficiency level of the microwave cooking appliance 200, so that the microwave cooking appliance 200 can meet the energy efficiency requirement. The position and size of the second slot feed port 36 corresponding to meeting the energy efficiency requirement can be determined by simulation.

[0044] In one embodiment, please refer to Figure 4 , the number of the slot feed ports 18 is three, and the three slot feed ports 18 are all the first slot feed ports 20. The three first slot feed ports 20 are rectangular. That is to say, when the electric field uniformity requirement of the microwave cooking appliance 200 is met by the design of the three first slot feed ports 20, the energy efficiency requirement of the microwave cooking appliance 200 is also met. In this case, the second slot feed port 36 can be omitted.

[0045] In one embodiment, please refer to Figure 5, the number of the slot feeds 18 is six, and the six slot feeds 18 are all arc-shaped. Among them, the four larger slot feeds 18 are all the first slot feeds 20, which are used to adjust the electric field uniformity of the microwave cooking appliance 200. The two smaller slot feeds 18 can be used as the first slot feeds 20 and the second slot feeds 36 at the same time. That is to say, the two smaller slot feeds 18 can be used to adjust the electric field uniformity of the microwave cooking appliance 200 and the energy efficiency level of the microwave cooking appliance 200 at the same time. The two smaller slot feeds 18 can cut the induced current lines of the waveguide 12. It can be understood that the number of the slot feeds 18 can be two or three or more than three.

[0046] Figures 2 to 3 , and Figures 7 to 14 respectively show the positions and shapes of multiple slot feeds 18. However, the embodiments of the present invention are not limited thereto, and the slot feeds 18 can adjust the electric field uniformity and energy efficiency requirements of the microwave cooking appliance 200 to meet the corresponding requirements.

[0047] The electric field uniformity and energy efficiency requirements of the microwave cooking appliance 200 can be two factors that are balanced with each other. In one embodiment, the electric field uniformity of the microwave cooking appliance 200 can be satisfied first, and then the energy efficiency requirements of the microwave cooking appliance 200 can be satisfied. In one embodiment, the energy efficiency requirements of the microwave cooking appliance 200 can be satisfied first, and then the electric field uniformity of the microwave cooking appliance 200 can be satisfied.

[0048] It can be understood that in some embodiments, all the slot feeds 18 are the first slot feeds 20.

[0049] In some embodiments, the slot feeds 18 include the first slot feeds 20 and the second slot feeds 36. One or some of the slot feeds 18 can be used as the first slot feeds 20 and the second slot feeds 36 at the same time. One or some of the slot feeds 18 can be used as the first slot feeds 20. One or some of the slot feeds 18 can be used as the second slot feeds 36.

[0050] In some embodiments, the slot feeds 18 include the first slot feeds 20 and the second slot feeds 36. One or some of the slot feeds 18 can be used as the first slot feeds 20 and the second slot feeds 36 at the same time. One or some of the slot feeds 18 can be used as the first slot feeds 20.

[0051] In some embodiments, the slot feeds 18 include the first slot feeds 20 and the second slot feeds 36. One or some of the slot feeds 18 can be used as the first slot feeds 20 and the second slot feeds 36 at the same time. One or some of the slot feeds 18 can be used as the second slot feeds 36.

[0052] In some embodiments, the slot feed 18 includes a first slot feed 20 and a second slot feed 36. One or some of the slot feeds 18 can serve as the first slot feed 20, and one or some of the slot feeds 18 can serve as the second slot feed 36.

[0053] In some embodiments, the slot feed 18 includes a first slot feed 20 and a second slot feed 36, and all of the slot feeds 18 simultaneously serve as the first slot feed 20 and the second slot feed 36.

[0054] In certain embodiments, please combine Figure 1 and Figure 15 , the waveguide 12 includes a connected input portion 37 and an output portion 38. The input portion 37 is provided with a microwave input port 40, the output portion 38 is provided with a microwave output port 16. The width of the output portion 38 is W2 and the length is L2. The voltage antinode of the waveguide 12 is arranged along the axis of W2×1 / 2, and the current antinodes of the waveguide 12 are arranged along the axes of L2×1 / 3 and L2×2 / 3.

[0055] Thus, the slot feed 18 can be set according to the size of the output portion 38.

[0056] Specifically, in Figure 1 , the microwave cooking appliance 200 further includes an electrical chamber 42. The electrical chamber 42 is located on one side of the cooking cavity 22 (such as Figure 1 the right side in), the microwave generating assembly 24 is arranged in the electrical chamber 42. The microwave generating assembly 24 includes a magnetron 44 and an inverter 46. The inverter 46 is connected to the magnetron 44, and the inverter 46 is used to supply power to the magnetron 44. The microwave output window of the magnetron 44 extends into the microwave input port 40 of the input portion 37. The output portion 38 is arranged above the top plate 28 of the cooking cavity 22 and covers the through hole 34.

[0057] As Figure 1 shown, the end of the antenna structure 100 is the slot feed 18. The microwave emitted from the magnetron 44 first passes through an input portion 37 with a width of W1, and then the size is changed to an output portion 38 with a width of W2 and a length of L2 through a conversion structure so that the transmission mode is converted to the TE20 mode. Finally, the induced current is cut by the slot feed 18 to generate radiation, and the microwave is fed into the cooking cavity 26. Figure 15 Shows a schematic diagram of the waveguide mode conversion structure and the electric field distribution.

[0058] The feed port piece 14 can serve as the feeding end, and its size is the same as that of the output portion 38. In order to simultaneously meet the energy efficiency and heating uniformity, the form and position of the slot feed 18 of the feed port piece 14 need to be designed according to certain rules. The feed port piece 14 can be divided into multiple quadrants according to the electric field distribution of the TE20 mode propagating in the waveguide. Please combine Figure 6and Figure 15 In the embodiment of the present utility model, according to the W2 and L2 dimensions, the feed port piece 14 is divided into six quadrants 1, 2, 3, 4, 5, and 6 at W2×1 / 2, L2×1 / 3, and L2×2 / 3. Among them, the axis along L2×1 / 3 is Y1, the axis along L2×2 / 3 is Y2, and both Y1 and Y2 are voltage wave nodes and current wave antinodes. The axis along W2×1 / 2 is X1. Along X1, λ / 4, λ / 2, and 3λ / 4 are voltage wave antinodes and current wave nodes (λ is the wavelength of the incident microwave), and the electric field strength is the strongest at this point. Please refer to Figure 6 and Figure 15 , the voltage wave antinodes at λ / 4, λ / 2, and 3λ / 4 respectively correspond to quadrants 14, quadrants 25, and quadrants 36. Matching the pressing and height of the cooking cavity 22, rectangular slot feeds 18 or equally long arc-shaped slot feeds 18 with a length of L3 and a width of W3 are provided in the six quadrants. By adjusting the length L3, width W3 of the slot feed 18, and the position of the quadrant where it is located, the energy efficiency of the microwave oven and the electric field uniformity can be improved, and thus the food cooking uniformity can be improved.

[0059] It can be understood that in other embodiments, the quadrant division method of the feed port piece 14 is not limited to the above method, and there can be other quadrant division methods.

[0060] In some embodiments, W2 is 65 mm (millimeters) to 200 mm, and L2 is 150 mm to 220 mm.

[0061] Therefore, the size of the output part 38 of the waveguide 12 that meets the requirements can be set.

[0062] Specifically, the width of the output part 38 is W2, and the length is L2. W2 is 65 mm to 200 mm, that is, 65 mm ≤ W2 ≤ 200 mm. In some examples, W2 = 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, 100 mm, 120 mm, 150 mm, 170 mm, 180 mm, 185 mm, 190 mm, 195 mm, 200 mm or other values between 65 mm and 200 mm.

[0063] L2 is 150 mm to 220 mm, that is, 150 mm ≤ L2 ≤ 220 mm. In some examples, L2 = 150 mm, 155 mm, 160 mm, 165 mm, 170 mm, 175 mm, 180 mm, 185 mm, 190 mm, 195 mm, 200 mm, 205 mm, 210 mm, 215 mm, 220 mm or other values between 150 mm and 220 mm.

[0064] When W2 ranges from 65 mm to 200 mm and L2 ranges from 150 mm to 220 mm, the size of the output portion 38 can meet the spatial requirements and functional requirements of the microwave cooking appliance 200.

[0065] In some embodiments, the width of the input portion 37 is W1, and W1 ranges from 65 mm to 95 mm.

[0066] Thus, the size of the input portion 37 of the waveguide 12 that meets the requirements can be set.

[0067] Specifically, the width of the input portion 37 is W1, and W1 ranges from 65 mm to 95 mm, that is, 65 mm ≤ W1 ≤ 95 mm. In some examples, W1 = 65 mm, 67 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 92 mm, 95 mm or other values from 65 mm to 95 mm.

[0068] When W1 ranges from 65 mm to 95 mm, the size of the input portion 37 can meet the spatial requirements and functional requirements of the microwave cooking appliance 200. In Figure 15 the illustrated embodiment, W2 > W1, the end of the antenna structure 100 is the slot feed 18. The microwave emitted from the magnetron 44 first passes through an input portion 37 with a width of W1, and then the size is changed to an output portion 38 with a width of W2 and a length of L2 through the conversion structure.

[0069] It can be understood that the length of the input portion 37 can be determined according to actual requirements.

[0070] In some embodiments, please refer to Figure 4 , the width of the slot feed 18 is W3 and the length is L3, where L3 ranges from 45 mm to 70 mm and W3 ranges from 12 mm to 30 mm.

[0071] Thus, the size of the slot feed 18 can meet the design of the electric field uniformity and the design of the energy efficiency requirements of the microwave cooking appliance 200.

[0072] Specifically, the width of the slot feed 18 is W3 and the length is L3, W3 ranges from 12 mm to 30 mm, that is, 12 mm ≤ W3 ≤ 30 mm. In some examples, W3 = 12 mm, 15 mm, 20 mm, 25 mm, 27 mm, 30 mm or other values from 12 mm to 30 mm.

[0073] L3 ranges from 45 mm to 70 mm, that is, 45 mm ≤ L3 ≤ 70 mm. In some examples, L3 = 45 mm, 47 mm, 50 mm, 55 mm, 60 mm, 65 mm, 67 mm, 70 mm or other values from 45 mm to 70 mm.

[0074] A microwave cooking appliance 200 according to an embodiment of the present utility model includes the antenna structure 100 of any of the above embodiments.

[0075] In the above microwave cooking appliance 200, the first slot feed port 20 is provided at the voltage antinode port of the waveguide 12. The first slot feed port 20 can adjust the electric field in the cooking cavity 26 of the microwave cooking cavity into which the microwave is fed to meet the uniform distribution of the microwave, so that the use of components such as motors and stirring supports can be reduced, the structure of the antenna structure 100 can be simplified, and the cost can be reduced.

[0076] Specifically, the microwave cooking appliance 200 includes a cooking cavity 22, an electrical chamber 42, and a microwave generating assembly 24. The antenna structure 100 can be installed on the cooking cavity 22. The electrical chamber 42 is located on one side of the cooking cavity 22, and the microwave generating assembly 24 is located in the electrical chamber 42. The microwave generating assembly 24 includes a microwave source and a power supply, and the power supply is connected to the microwave source. In Figure 1 In the present embodiment shown, the microwave source includes a magnetron 44, and the power supply includes an inverter 46. The inverter 46 supplies power to the magnetron 44. When the magnetron 44 operates, it outputs microwaves through the microwave output window. The microwaves are transmitted to the feed port piece 14 through the waveguide 12, and the slot feed port 18 feeds the microwaves into the cooking cavity 26. It can be understood that in other embodiments, the microwave source may include a radio frequency module.

[0077] In some embodiments, the microwave cooking appliance 200 includes a cooking cavity 22. The feed port piece 14 is provided on at least one of the top plate 28, the bottom plate 32, and the side plate 30 of the cooking cavity 22. The side plate 30 of the cooking cavity 22 is connected to the top plate 28 and the bottom plate 32 of the cooking cavity 22.

[0078] Thus, the feed port piece 14 can be configured according to the space of the microwave cooking appliance 200.

[0079] Specifically, in Figure 1 In the embodiment shown, the feed port piece 14 is provided on the top plate 28 of the cooking cavity 22. Specifically, the cooking cavity 22 includes a U-shaped plate. The top plate 28 of the U-shaped plate is provided with a through hole 34. The feed port piece 14 can cover the through hole 34. The output portion 38 of the waveguide 12 can be connected to the outer side surface of the top plate 28 and cover the through hole 34. When the microwave cooking appliance 200 starts the microwave mode, the magnetron 44 operates to generate microwaves. The microwaves are transmitted through the waveguide 12 and enter the cooking cavity 26 by inducing and radiating multiple incident waves with different phases through the slot feed port 18, realizing uniform heating of the food.

[0080] In Figure 1In this case, the microwave cooking appliance 200 further includes an inner partition 48. The bottom plate 32 of the cooking cavity 22 is provided with a recess, and the inner partition 48 is disposed on the bottom plate 32 of the cooking cavity 22 and covers the recess 50. The microwave cooking appliance 200 is a flat-panel microwave cooking appliance 200. It can be understood that in other embodiments, the microwave cooking appliance 200 can be a turntable microwave cooking appliance 200.

[0081] In one embodiment, the feed port piece 14 can be disposed on the bottom plate 32 of the cooking cavity 22. Specifically, the bottom plate 32 of the U-shaped plate is provided with a through hole 34, the feed port piece 14 can cover the through hole 34, and the output portion 38 of the waveguide 12 can be connected to the lower side surface of the bottom plate 32 and cover the through hole 34.

[0082] In one embodiment, the feed port piece 14 can be disposed on the side plate 30 of the cooking cavity 22. Specifically, the side plate 30 of the cooking cavity 22 is provided with a through hole 34, the feed port piece 14 can cover the through hole 34, and the output portion 38 of the waveguide 12 can be connected to the outer side surface of the side plate 30 and cover the through hole 34.

[0083] In one embodiment, the feed port piece 14 can be disposed on any two or three of the top plate 28, the bottom plate 32, and the side plate 30 of the cooking cavity 22. In one embodiment, the side plate 30 includes the left side plate 30, the right side plate 30, and the rear side plate 30 of the cooking cavity 22.

[0084] In some embodiments, the microwave cooking appliance 200 includes a microwave generating assembly 24 and an electrical chamber 42. The electrical chamber 42 is located on the side of the cooking cavity 22, and the microwave generating assembly 24 is located in the electrical chamber 42 and connected to the waveguide 12.

[0085] Thus, the electrical chamber 42 can protect the microwave generating assembly 24 and avoid damage to the microwave generating assembly 24 to a certain extent.

[0086] Specifically, in Figure 1 this case, the electrical chamber 42 is located on the right side of the cooking cavity 22. A control panel can be installed on the front side of the electrical chamber 42. The control panel can be electrically connected to the microwave generating assembly 24 and is used to control the operation of the microwave cooking appliance 200. A door body (not shown in the figure) is provided on the front side of the cooking cavity 22. The door body is rotatably connected to the cooking cavity 22. An opening 52 communicating with the cooking chamber 26 is provided on the front side of the cooking cavity 22. The door body is used to open and close the opening 52. Optionally, the antenna structure 100 can also be disposed on the door body.

[0087] Optionally, the microwave cooking appliance 200 includes a housing (not shown in the figure). The housing covers the cooking cavity 22 and the electrical chamber 42 on the left side of the cooking cavity 22, the right side of the electrical chamber 42, and the top of the cooking cavity 22 and the electrical chamber 42.

[0088] In some embodiments, the microwave cooking appliance 200 includes a cooling fan 54 located in the electrical chamber 42 for cooling the microwave generating assembly 24.

[0089] Thereby, the microwave generating assembly 24 can be made to operate at an appropriate temperature to a certain extent.

[0090] Specifically, in Figure 1 the cooling fan 54 can be located behind the microwave generating assembly 24. When the microwave generating assembly 24 operates, a large amount of heat is generated, and the cooling fan 54 can cool the microwave generating assembly 24 when it operates. In one embodiment, when the cooling fan 54 operates, it can blow the hot air in the electrical chamber 42 to the rear of the microwave cooking appliance 200 to cool the microwave generating assembly 24 and other components in the electrical chamber 42. In one embodiment, when the cooling fan 54 operates, it can suck in cold air from the rear of the microwave cooking appliance 200 to cool the microwave generating assembly 24 and other components in the electrical chamber 42.

[0091] In summary, the microwave cooking appliance 200 according to the embodiment of the present utility model can convert microwaves through a waveguide mode and realize multi-phase microwave feeding through the multi-slit feed port 18, replacing the original microwave stirring system, reducing the overall cost of the machine, improving the microwave uniformity, and realizing the reduction of the size of the bottom electrical chamber by replacing the microwave stirring system at the bottom with a waveguide with a multi-slit feed port 18, effectively improving the overall volume ratio of the microwave cooking appliance 200.

[0092] 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" 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 utility model. 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 a suitable manner in any one or more embodiments or examples.

[0093] Although the embodiments of the present utility model 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 utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. An antenna structure for a microwave cooking appliance, characterized in that: The antenna structure comprises: A waveguide, wherein the waveguide is provided with a microwave output port; A feed plate is installed at the microwave output port, and the feed plate is provided with a plurality of slot feed ports, wherein the plurality of slot feed ports include a first slot feed port, and the first slot feed port is provided at a voltage antinode point of the waveguide tube.

2. The antenna structure according to claim 1, characterized in that: The plurality of slot feeds include a second slot feed, and the second slot feed is arranged at a current antinode point of the waveguide tube.

3. The antenna structure according to claim 2, characterized in that: The waveguide tube includes an input part and an output part that are connected to each other. The input part is provided with a microwave input port, and the output part is provided with the microwave output port. The width of the output part is W2 and the length is L2. The voltage antinode point of the waveguide tube is arranged along the axis of W2×1 / 2, and the current antinode point of the waveguide tube is arranged along the axis of L2×1 / 3 and along the axis of L2×2 / 3.

4. The antenna structure according to claim 3, characterized in that: W2 is 65mm to 200mm, and L2 is 150mm to 220mm.

5. The antenna structure according to claim 3, characterized in that: The width of the input portion is W1, and W1 is 65 mm to 95 mm.

6. The antenna structure according to claim 1, characterized in that: The width of the slot feed port is W3, and the length is L3, wherein L3 is 45 mm to 70 mm, and W3 is 12 mm to 30 mm.

7. A microwave cooking appliance, characterized in that: Comprising the antenna structure according to any one of claims 1 to 6.

8. The microwave cooking appliance according to claim 7, characterized in that: The microwave cooking appliance comprises a cooking cavity, the feed plate is arranged on at least one of the top plate, the bottom plate and the side plate of the cooking cavity, and the side plate of the cooking cavity connects the top plate of the cooking cavity and the bottom plate of the cooking cavity.

9. The microwave cooking appliance according to claim 8, characterized in that: The microwave cooking appliance comprises a microwave generating assembly and an electrical chamber, wherein the electrical chamber is located at a side of the cooking cavity, and the microwave generating assembly is located in the electrical chamber and connected to the waveguide.

10. The microwave cooking appliance according to claim 9, characterized in that: The microwave cooking appliance comprises a cooling fan, which is located in the electrical chamber and is used for cooling the microwave generating assembly.

Images