Antenna structure, microwave generation assembly, microwave cooking appliance and cooking apparatus

Abstract

Provided in the embodiments of the present application are an antenna structure, a microwave generation assembly, a microwave cooking appliance and a cooking apparatus. The antenna structure is used in the microwave cooking appliance, the antenna structure comprising: a first waveguide tube, which is provided with a microwave output port; and a feed patch, which is mounted at the microwave output port, wherein the feed patch is provided with a plurality of slot feeds, the plurality of slot feeds including a first slot feed, which is arranged at a voltage antinode of the waveguide tube. In the antenna structure, the first slot feed arranged at the voltage antinode of the first waveguide tube can regulate an electric field fed into a cooking cavity of the microwave cooking appliance so as to achieve a uniform distribution of microwaves, thereby reducing the use of components such as electric motors and stirring supports, simplifying the structure of the antenna structure and reducing costs.

Description

Antenna structure, microwave generating components, microwave cooking appliances and cooking equipment

[0001] This application claims priority to three Chinese patent applications filed with the China National Intellectual Property Administration on August 29, 2024, with application number “202422120443.6” and title “Antenna Structure and Microwave Cooking Appliance”; filed with the China National Intellectual Property Administration on August 12, 2024, with application number “202411103127.6” and title “Microwave Generating Component and Cooking Equipment”; and filed with the China National Intellectual Property Administration on June 17, 2024, with application number “202410785055.1” and title “Microwave Generating Component and Cooking Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of household appliance technology, and more specifically, to an antenna structure, a microwave generating component, a microwave cooking appliance, and a cooking device. Background Technology

[0003] In related technologies, the microwave heating principle of microwave cooking appliances involves a magnetron generating microwaves, which are then transmitted to the cooking appliance cavity via a waveguide. A bottom motor drives an antenna to rotate and stir the microwaves, thus heating the food more evenly. However, the aforementioned microwave antenna stirring system, comprising components such as the antenna, motor, and stirring support, has a complex structure and high overall cost. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art or related technologies.

[0005] In view of this, one object of this application is to provide an antenna structure.

[0006] Another object of this application is to provide a microwave cooking appliance.

[0007] Another object of this application is to provide a microwave generating component.

[0008] Another objective of this application is to provide a cooking device.

[0009] Another object of this application is to provide a microwave generating component.

[0010] Another objective of this application is to provide a cooking device.

[0011] To achieve the above objectives, the first aspect of this application provides an antenna structure for microwave cooking appliances. The antenna structure includes: a first waveguide with a microwave output port; a feed plate installed at the microwave output port, the feed plate having multiple slot feed ports, the multiple slot feed ports including a first slot feed port, the first slot feed port being located at the voltage antinode of the first waveguide.

[0012] In some technical solutions, the first slot feed can optionally be located at the voltage antinode of the first waveguide. The first slot feed can adjust the electric field fed into the cooking cavity of the microwave cooking appliance to ensure uniform microwave distribution, thereby reducing the use of components such as motors and stirring supports, simplifying the antenna structure and reducing costs.

[0013] In some technical solutions, optionally, the multiple slot feed ports include a second slot feed port, which is located at the current antinode of the first waveguide.

[0014] In some technical solutions, optionally, the first waveguide includes an input section and an output section connected to each other. The input section is provided with a microwave input port, and the output section is provided with a microwave output port. The width of the output section is W2 and the length is L2. The voltage antinode of the first waveguide is set along the axis of W2×1 / 2, and the current antinode of the first waveguide is set along the axis of L2×1 / 3 and along the axis of L2×2 / 3.

[0015] In some technical solutions, optionally, W2 is 65mm to 200mm and L2 is 150mm to 220mm.

[0016] In some technical solutions, the width of the input section is optionally W1, where W1 is 65mm to 95mm.

[0017] In some technical solutions, optionally, the width of the slot feed is W3 and the length is L3, where L3 is 45mm to 70mm and W3 is 12mm to 30mm.

[0018] The technical solution of this application provides a microwave cooking appliance with an antenna structure including any of the above embodiments.

[0019] The first slot feed port is located at the voltage antinode of the first waveguide. The first slot feed port can adjust the electric field fed into the cooking cavity of the microwave cooking appliance to ensure uniform microwave distribution, thereby reducing the use of components such as motors and stirring supports, simplifying the antenna structure and reducing costs.

[0020] In some technical solutions, the microwave cooking appliance optionally includes a cooking cavity, with a feed plate disposed on at least one of the top plate, bottom plate, and side plate of the cooking cavity, and the side plate of the cooking cavity connecting the top plate and the bottom plate of the cooking cavity.

[0021] In some technical solutions, the microwave cooking appliance optionally includes a first microwave generating component and an electrical chamber, the electrical chamber being located on the side of the cooking cavity, and the first microwave generating component being located in the electrical chamber and connected to a first waveguide.

[0022] In some technical solutions, the microwave cooking appliance optionally includes a cooling fan located in the electrical compartment, the cooling fan being used to cool the first microwave generating component.

[0023] The technical solution of this application provides a microwave generating assembly, including: a second housing, the second housing including a plurality of first walls and second walls, the second walls having a pick-up and put-out port; a second magnetron, at least partially disposed outside the second housing; a second waveguide feed port, disposed on at least two of the first walls, each second waveguide feed port having a second waveguide antenna; a second waveguide, one end of the second waveguide being connected to the second magnetron, and the other end being connected to the second waveguide feed port; wherein, microwaves emitted by the second magnetron are fed into the second housing via the second waveguide antennas on at least two of the first walls.

[0024] In some technical solutions, optionally, the second waveguide feed port is rectangular, and the wavelength of the microwave fed into the second waveguide by the second magnetron is the first wavelength.

[0025] In some technical solutions, optionally, the second magnetron is located on the outside of a first wall, and a second waveguide feed port and the second magnetron are located on the same first wall. The first distance between the geometric center of the second waveguide feed port located on the same first wall and the waveguide output port of the second magnetron is a positive integer multiple of half of the first wavelength.

[0026] In some technical solutions, optionally, a second waveguide feed port is provided on each of the two adjacent first walls, and a connecting edge exists between the two adjacent first walls. In the two adjacent first walls, a second magnetron is provided on one of the first walls, and the shortest distance between the geometric center of the second waveguide feed port of the other first wall and the connecting edge is the second distance. The shortest distance between the waveguide output port of the second magnetron and the connecting edge is the third distance. The sum of the second distance and the third distance is a positive integer multiple of half of the first wavelength.

[0027] In some technical solutions, optionally, two adjacent first walls are the side walls and bottom walls of the second housing, and the first walls are respectively provided with second waveguide feed ports, and the side walls are provided with second magnetrons, with the second magnetrons located below the second waveguide feed ports.

[0028] In some technical solutions, optionally, two adjacent first walls are the side walls and top walls of the second housing, and the first walls are respectively provided with second waveguide feed ports, and the side walls are provided with second magnetrons, with the second magnetrons located above the second waveguide feed ports.

[0029] In some technical solutions, optionally, a second waveguide feed port is provided on three adjacent first walls, which are the side walls, top walls and bottom walls of the second housing.

[0030] In some technical solutions, optionally, the second waveguide antenna is provided with multiple second waveguide ports, which are rectangular in shape.

[0031] In some technical solutions, optionally, the width of the second waveguide aperture is related to half the first wavelength.

[0032] Another aspect of the technical solution of this application provides a cooking device, including: a second housing; and a microwave generating component disposed within the second housing.

[0033] Another aspect of this application provides a microwave generating assembly, comprising: a third housing; a third magnetron, at least partially disposed outside the third housing; a third waveguide feed port disposed on the wall of the third housing, the third waveguide feed port having a third waveguide antenna; a third waveguide tube, one end of the third waveguide tube being connected to the third magnetron, and the other end being connected to the third waveguide feed port, wherein microwaves emitted by the third magnetron are fed into the interior of the third housing via the third waveguide tube and the third waveguide antenna; wherein the third waveguide antenna has a plurality of third waveguide ports, the third waveguide antenna including a plurality of sub-regions disposed around the geometric center of the third waveguide feed port, each sub-region having at least a portion of the third waveguide ports.

[0034] In some technical solutions, optionally, the wavelength of the microwaves fed into the third waveguide by the third magnetron is the first wavelength λ. g The width of the third waveguide port is λ. g / 2.

[0035] In some technical solutions, the shape of the third waveguide aperture may optionally include a rectangular through-hole and / or an arc-shaped through-hole.

[0036] In some technical solutions, optionally, multiple third waveguide ports are arranged symmetrically about the axis of symmetry passing through the geometric center of the third waveguide feed port.

[0037] In some technical solutions, optionally, multiple third waveguide ports are arranged in a centrally symmetrical manner about the geometric center of the third waveguide feed port.

[0038] In some technical solutions, optionally, a reflector is also included, which is disposed in the third enclosure, and the reflector and the third waveguide feed port are disposed on two opposite walls in the third enclosure.

[0039] In some technical solutions, the reflector may optionally include: a substrate, wherein a diffuse reflection portion is provided on the side of the substrate facing the third waveguide feed port.

[0040] In some technical solutions, the diffuse reflection portion optionally includes: a protrusion, the surface of which is not parallel to the substrate; and / or a recess, the surface of which is not parallel to the substrate.

[0041] In some technical solutions, the reflector and the third waveguide feed port may optionally be located on the top and bottom walls of the third enclosure; or the reflector and the third waveguide feed port may be located on the left and right walls of the third enclosure.

[0042] Another aspect of the technical solution of this application provides a cooking device, including: a third housing; and a microwave generating component disposed within the third housing.

[0043] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0044] Figure 1 is an exploded view of the microwave cooking appliance according to an embodiment of this application;

[0045] Figures 2 to 5 are schematic diagrams of the feed plate structure according to the embodiments of this application;

[0046] Figure 6 is a schematic diagram of the quadrant division of the feed plate according to an embodiment of this application;

[0047] Figures 7 to 14 are schematic diagrams of the feed plate structure according to the embodiments of this application;

[0048] Figure 15 is a schematic diagram of the waveguide mode conversion structure and electric field distribution according to an embodiment of this application;

[0049] Figure 16 is a cross-sectional schematic diagram of a microwave cooking appliance in the related technology;

[0050] Figure 17 shows a schematic diagram of the structure of a microwave generating assembly according to an embodiment of this application;

[0051] Figure 18 shows a schematic diagram of the structure of a microwave generating assembly according to an embodiment of this application;

[0052] Figure 19 shows a schematic diagram of a waveguide according to an embodiment of this application;

[0053] Figure 20 shows a schematic diagram of a combined structure of two waveguide feed ports according to an embodiment of this application;

[0054] Figure 21 shows a schematic diagram of a combined structure of two waveguide feed ports according to an embodiment of this application;

[0055] Figure 22 shows a schematic diagram of a combined structure of two waveguide feed ports according to an embodiment of this application;

[0056] Figure 23 shows a schematic diagram of a combined structure of two waveguide feed ports according to an embodiment of this application;

[0057] Figure 24 shows a schematic diagram of a combined structure of two waveguide feed ports according to an embodiment of this application;

[0058] Figure 25 shows a schematic diagram of a combined structure of two waveguide feed ports according to an embodiment of this application;

[0059] Figure 26 shows a schematic diagram of the structure of a cooking device according to an embodiment of this application;

[0060] Figure 27 shows a schematic diagram of the structure of a cooking device in the related technology;

[0061] Figure 28 shows a schematic diagram of the structure of a microwave generating assembly according to an embodiment of this application;

[0062] Figure 29 shows a schematic diagram of the structure of a microwave generating assembly according to an embodiment of this application;

[0063] Figure 30 shows a schematic diagram of the structure of a third waveguide according to an embodiment of this application;

[0064] Figure 31 shows a schematic diagram of the structure of a reflector according to an embodiment of this application;

[0065] Figure 32 shows a schematic diagram of the structure of a reflector according to an embodiment of this application;

[0066] Figure 33 shows a schematic diagram of the structure of a reflector according to an embodiment of this application;

[0067] Figure 34 shows a schematic diagram of the structure of a third waveguide antenna according to an embodiment of this application;

[0068] Figure 35 shows a schematic diagram of the structure of a third waveguide antenna according to an embodiment of this application;

[0069] Figure 36 shows a schematic diagram of the structure of a third waveguide antenna according to an embodiment of this application;

[0070] Figure 37 shows a schematic diagram of the structure of a third waveguide antenna according to an embodiment of this application;

[0071] Figure 38 shows a schematic diagram of the structure of a third waveguide antenna according to an embodiment of this application;

[0072] Figure 39 shows a schematic diagram of the structure of a cooking device according to an embodiment of this application;

[0073] Figure 40 shows a schematic diagram of a reflector performing specular reflection according to an embodiment of this application;

[0074] Figure 41 shows a schematic diagram of a reflector performing diffuse reflection according to an embodiment of this application.

[0075] The correspondence between the reference numerals and component names in Figures 1 to 16 is as follows: 100: Antenna structure; 200: Microwave cooking appliance; 12: First waveguide; 14: Feed plate; 16: Microwave output port; 18: Slot feed; 20: First slot feed; 22: Cooking cavity; 24: First microwave generating component; 26: Cooking cavity; 28: Top plate; 30: Side plate; 32: Bottom plate; 34: Through hole; 36: Second slot feed; 37: Input section; 38: Output section; 40: Microwave input port; 42: Electrical compartment; 44: First magnetron; 46: Frequency converter; 48: Inner partition; 50: Recess; 52: Opening; 54: Cooling fan; 202: Cavity; 204: Stirring antenna; 206: Fourth waveguide;

[0076] The correspondence between the reference numerals and component names in Figures 17 to 27 is as follows: 300: Microwave generating assembly; 302: Second housing; 3022: First wall; 3024: Second wall; 3026: Loading / unloading port; 304: Second magnetron; 306: Second waveguide feed port; 308: Second waveguide antenna; 3082: Second waveguide port; 310: Second waveguide; 312: Waveguide output port; 314: Connecting edge; 400: Cooking equipment; 402: Second housing; 302': Stirring system.

[0077] The correspondence between the reference numerals and component names in Figures 28 to 41 is as follows: 500: Microwave generating assembly; 502: Third housing; 504: Third magnetron; 506: Third waveguide; 5062: Third waveguide feed port; 508: Third waveguide antenna; 5082: Third waveguide port; 5084: Sub-region; 510: Reflector; 5102: Substrate; 5104: Diffuse reflection section; 5122: Protrusion; 5124: Recess; 600: Cooking equipment; 602: Third housing. Detailed Implementation

[0078] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0079] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0080] Some embodiments according to this application are described below with reference to Figures 1 to 16.

[0081] In related technologies, as shown in Figure 16, the internal structure of a flatbed microwave oven is illustrated. A fourth waveguide 206 and a stirring antenna system are located at the bottom of the cavity. The fourth waveguide 206 is riveted to the cavity 202, and the magnetron is fixed to the waveguide with screws. When the microwave oven is operating, the magnetron generates microwaves that are transmitted into the cavity through the waveguide. The bottom motor drives the stirring antenna 204 to rotate continuously, thus disrupting the microwave field inside the cavity 202.

[0082] The microwave heating principle of microwave cooking appliances involves a magnetron generating microwaves, which are then transmitted to the cooking appliance cavity via a waveguide. A bottom motor drives a stirring antenna 204 to rotate and stir the microwaves, resulting in more even heating of the food. However, the aforementioned microwave antenna stirring system, comprising the stirring antenna 204, motor, stirring support, and other components, has a complex structure and high overall cost. Furthermore, the microwave stirring system is approximately 110mm thick, occupying considerable bottom space and resulting in a small overall volume ratio.

[0083] Please refer to Figures 1, 2, 3, 4, and 5. An antenna structure 100 provided in this application is used in a microwave cooking appliance 200. The antenna structure 100 includes a first waveguide 12 and a feed plate 14. The first waveguide 12 has a microwave output port 16, and the feed plate 14 is installed at the microwave output port 16. The feed plate 14 has multiple slotted feed ports 18, including a first slotted feed port 20, which is located at the voltage antinode of the first waveguide 12.

[0084] In the antenna structure 100 described above, the first slot feed port 20 is located at the voltage antinode of the first waveguide 12. The first slot feed port 20 can adjust the electric field fed into the cooking cavity 26 of the microwave cooking appliance to ensure uniform microwave distribution, thereby reducing the use of components such as motors and stirring supports, simplifying the structure of the antenna structure 100 and reducing costs.

[0085] Specifically, the antenna structure 100 can be applied to a microwave cooking appliance 200, which includes, but is not limited to, microwave ovens, microwave-steam-grill combos, and integrated cooktops. The microwave cooking appliance 200 includes a cooking cavity 22 and a first microwave generating component 24. The cooking cavity 22 has a cooking chamber 26 inside, where food can be placed. Microwaves can be fed into the cooking chamber 26 through the slot feed port 18 to heat the food inside the cooking chamber 26.

[0086] The feed plate 14 can be disposed on at least one of the top plate 28, side plate 30, and bottom plate 32 of the cooking cavity 22, and the first waveguide 12 can be provided with a corresponding microwave output port 16. In Figure 1, the feed plate 14 is disposed 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, and the feed plate 14 can cover the through hole 34. The first waveguide 12 can be connected to the outer surface of the top plate 28 and cover the through hole 34. The first microwave generating component 24 is connected to the first waveguide 12. When the first microwave generating component 24 is running, it can generate microwaves. The microwaves are conducted through the first waveguide 12 to the feed plate 14, and then fed into the cooking cavity 26 through the slit feed port 18.

[0087] In some embodiments, the present application can provide multiple feed sources at the top or bottom of the cooking cavity 22, and the bottom of the cooking cavity 22 can be stretched down by no more than 15mm. This eliminates the need to reserve the thickness of the stirring antenna and motor (approximately 50mm), effectively solving the problem of excessively large bottom electrical compartment volume and increasing the overall volume ratio of the machine by about 20%.

[0088] Once the structural dimensions of the first waveguide 12 are determined, its voltage antinodes can be determined through simulation or other methods, allowing the first slot feed 20 to be positioned at one of these antinodes. The first slot feed 20, located at the voltage antinode of the first waveguide 12, can adjust the electric field uniformity within the cooking cavity 26. Simulation can determine the position and dimensions of the first slot feed 20 that meet the electric field uniformity requirements.

[0089] In some embodiments, the plurality of slot feed ports 18 include a second slot feed port 36, which is located at the current antinode of the first waveguide 12.

[0090] Therefore, the microwave cooking appliance 200 can meet energy efficiency requirements.

[0091] Specifically, once the structural dimensions of the first waveguide 12 are determined, the current antinode of the first waveguide 12 can be determined through simulation or other methods, thereby allowing the second slot feed port 36 to be positioned at the current antinode of the first waveguide 12. The second slot feed port 36, located at the current antinode of the first waveguide 12, can adjust the energy efficiency level of the microwave cooking appliance 200, thereby enabling the microwave cooking appliance 200 to meet energy efficiency requirements. Simulation can determine the position and size of the second slot feed port 36 corresponding to meeting energy efficiency requirements.

[0092] In one embodiment, referring to Figure 4, there are three slot feed ports 18, all of which are first slot feed ports 20. The three first slot feed ports 20 are rectangular. That is to say, when the design of the three first slot feed ports 20 meets the electric field uniformity requirement of the microwave cooking appliance 200, it also meets the energy efficiency requirement of the microwave cooking appliance 200. In this case, the second slot feed port 36 can be omitted.

[0093] In one embodiment, referring to Figure 5, there are six slot feed ports 18, all of which are arc-shaped. The four larger slot feed ports 18 are all first slot feed ports 20, used to adjust the electric field uniformity of the microwave cooking appliance 200. The two smaller slot feed ports 18 can simultaneously serve as first slot feed ports 20 and second slot feed ports 36; that is, these two smaller slot feed ports 18 can be used simultaneously to adjust both the electric field uniformity and the energy efficiency level of the microwave cooking appliance 200. These two smaller slot feed ports 18 can cut into the induced current lines of the first waveguide 12. It is understood that the number of slot feed ports 18 can be two, three, or more.

[0094] Figures 2, 3, 7, 8, 9, 10, 11, 12, 13 and 14 show the positions and shapes of the multiple slot feed ports 18. However, the embodiments of this application are not limited to these. The slot feed ports 18 can adjust the electric field uniformity and energy efficiency requirements of the microwave cooking appliance 200 to meet the corresponding requirements.

[0095] The uniformity of the electric field and the energy efficiency requirement of the microwave cooking appliance 200 can be two mutually balanced factors. In one embodiment, the uniformity of the electric field of the microwave cooking appliance 200 can be satisfied first, and then the energy efficiency requirement of the microwave cooking appliance 200 can be satisfied. In another embodiment, the energy efficiency requirement of the microwave cooking appliance 200 can be satisfied first, and then the uniformity of the electric field of the microwave cooking appliance 200 can be satisfied.

[0096] It is understandable that in some implementations, all slot feeds 18 are first slot feeds 20.

[0097] In some embodiments, the slot feed 18 includes a first slot feed 20 and a second slot feed 36. One or more slot feeds 18 can simultaneously serve as the first slot feed 20 and the second slot feed 36. One or more slot feeds 18 can serve as the first slot feed 20, and one or more slot feeds 18 can serve as the second slot feed 36.

[0098] In some embodiments, the slot feed 18 includes a first slot feed 20 and a second slot feed 36. One or more slot feeds 18 can simultaneously serve as the first slot feed 20 and the second slot feed 36, and one or more slot feeds 18 can serve as the first slot feed 20.

[0099] In some embodiments, the slot feed 18 includes a first slot feed 20 and a second slot feed 36. One or more slot feeds 18 can simultaneously serve as the first slot feed 20 and the second slot feed 36, and one or more slot feeds 18 can serve as the second slot feed 36.

[0100] In some embodiments, the slot feed 18 includes a first slot feed 20 and a second slot feed 36. One or more slot feeds 18 can serve as the first slot feed 20, and one or more slot feeds 18 can serve as the second slot feed 36.

[0101] In some embodiments, the slot feed 18 includes a first slot feed 20 and a second slot feed 36, and all slot feeds 18 simultaneously serve as both the first slot feed 20 and the second slot feed 36.

[0102] In some embodiments, referring to Figures 1 and 15, the first waveguide 12 includes an input section 37 and an output section 38 connected to each other. The input section 37 is provided with a microwave input port 40, and the output section 38 is provided with a microwave output port 16. The width of the output section 38 is W2 and the length is L2. The voltage antinode of the first waveguide 12 is arranged along the axis of W2×1 / 2, and the current antinode of the first waveguide 12 is arranged along the axis of L2×1 / 3 and along the axis of L2×2 / 3.

[0103] Therefore, the slot feed 18 can be set according to the size of the output section 38.

[0104] Specifically, as shown in Figure 1, the microwave cooking appliance 200 also includes an electrical chamber 42, which is located on one side of the cooking cavity 22 (the right side in Figure 1). A first microwave generating assembly 24 is disposed within the electrical chamber 42. The first microwave generating assembly 24 includes a first magnetron 44 and a frequency converter 46. The frequency converter 46 is connected to the first magnetron 44 and supplies power to the first magnetron 44. The microwave output window of the first magnetron 44 extends into the microwave input port 40 of the input section 37. The output section 38 is located above the top plate 28 of the cooking cavity 22 and covers the through hole 34.

[0105] As shown in Figure 1, the end of the antenna structure 100 is a slot feed port 18. The microwave emitted from the first magnetron 44 first passes through an input section 37 with a width of W1, and then the output section 38, whose size is changed to a width of W2 and a length of L2, is transformed by a conversion structure, thereby converting the transmission mode to the TE20 mode. Finally, the induced current is cut by the slot feed port 18 to generate radiation, feeding the microwave into the cooking cavity 26. Figure 15 shows a schematic diagram of the waveguide mode conversion structure and electric field distribution.

[0106] The feed plate 14 can serve as the feed end, and its dimensions are the same as those of the output section 38. To simultaneously satisfy energy efficiency and heating uniformity, the form and position of the slot feed 18 of the feed plate 14 need to be designed according to certain rules. Based on the electric field distribution of the TE20 mode propagating in the waveguide, the feed plate 14 can be divided into multiple quadrants. Referring to Figures 6 and 15, in the embodiment of this application, according to the dimensions W2 and L2, the feed plate 14 is divided into six quadrants 1, 2, 3, 4, 5, and 6 at W2×1 / 2, L2×1 / 3, and L2×2 / 3. The axis along L2×1 / 3 is Y1, and the axis along L2×2 / 3 is Y2. Y1 and Y2 are both voltage antinodes and current antinodes, respectively. The axis along W2×1 / 2 is designated as X1. Along X1, λ / 4, λ / 2, and 3λ / 4 are voltage antinodes and current nodes (λ is the incident microwave wavelength), where the electric field strength is strongest. Referring to Figures 6 and 15, the voltage antinodes at λ / 4, λ / 2, and 3λ / 4 correspond to quadrants 14, 25, and 36, respectively. Based on the shape and height of the cooking cavity 22, rectangular or equal-length arc-shaped slot feeds 18 with a length of L3 and a width of W3 are placed in each of the six quadrants. By adjusting the length L3, width W3, and quadrant position of the slot feeds 18, the microwave oven's energy efficiency and electric field uniformity can be improved, thereby improving the uniformity of food cooking.

[0107] It is understood that in other embodiments, the feed plate 14 is not limited to the quadrant division method described above, and may have other quadrant division methods.

[0108] In some implementations, W2 is 65 mm to 200 mm and L2 is 150 mm to 220 mm.

[0109] Therefore, the size of the output section 38 of the first waveguide 12 can be set to meet the requirements.

[0110] Specifically, the width of the output section 38 is W2, and the length is L2. W2 is between 65mm and 200mm, that is, 65mm ≤ W2 ≤ 200mm. In some examples, W2 = 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 120mm, 150mm, 170mm, 180mm, 185mm, 190mm, 195mm, 200mm, or other values ​​between 65mm and 200mm.

[0111] L2 is between 150mm and 220mm, that is, 150mm ≤ L2 ≤ 220mm. In some examples, L2 = 150mm, 155mm, 160mm, 165mm, 170mm, 175mm, 180mm, 185mm, 190mm, 195mm, 200mm, 205mm, 210mm, 215mm, 220mm or other values ​​between 150mm and 220mm.

[0112] With W2 ranging from 65mm to 200mm and L2 ranging from 150mm to 220mm, the size of the output section 38 can meet the space and functional requirements of the microwave cooking appliance 200.

[0113] In some embodiments, the width of the input section 37 is W1, which is 65mm to 95mm.

[0114] Therefore, the size of the input section 37 of the first waveguide 12 can be set to meet the requirements.

[0115] Specifically, the width of the input section 37 is W1, which is 65mm to 95mm, that is, 65mm≤W1≤95mm. In some examples, W1 = 65mm, 67mm, 70mm, 75mm, 80mm, 85mm, 90mm, 92mm, 95mm or other values ​​between 65mm and 95mm.

[0116] W1 is 65mm to 95mm, which allows the size of the input section 37 to meet the space and functional requirements of the microwave cooking appliance 200. In the embodiment shown in Figure 15, W2>W1, and the end of the antenna structure 100 is a slot feed port 18. The microwave emitted from the first magnetron 44 first passes through the input section 37 with a width of W1, and then the size is changed to the output section 38 with a width of W2 and a length of L2 by the conversion structure.

[0117] It is understandable that the length of the input section 37 can be determined according to actual needs.

[0118] In some embodiments, referring to Figure 4, the width of the slot feed 18 is W3 and the length is L3, where L3 is 45mm to 70mm and W3 is 12mm to 30mm.

[0119] Therefore, the size of the slot feed 18 can meet the design requirements for electric field uniformity and energy efficiency of the microwave cooking appliance 200.

[0120] Specifically, the width of the slot feed 18 is W3, and the length is L3, where W3 is between 12mm and 30mm, that is, 12mm ≤ W3 ≤ 30mm. In some examples, W3 = 12mm, 15mm, 20mm, 25mm, 27mm, 30mm, or other values ​​between 12mm and 30mm.

[0121] L3 is 45mm to 70mm, that is, 45mm≤L3≤70mm. In some examples, L3 = 45mm, 47mm, 50mm, 55mm, 60mm, 65mm, 67mm, 70mm or other values ​​between 45mm and 70mm.

[0122] A microwave cooking appliance 200 according to an embodiment of this application includes the antenna structure 100 of any of the above embodiments.

[0123] In the microwave cooking appliance 200 described above, the first slot feed port 20 is located at the voltage antinode of the first waveguide 12. The first slot feed port 20 can adjust the electric field fed into the cooking cavity 26 of the microwave cooking appliance to meet the requirement of uniform microwave distribution, thereby reducing the use of components such as motors and stirring supports, simplifying the structure of the antenna structure 100 and reducing costs.

[0124] Specifically, the microwave cooking appliance 200 includes a cooking cavity 22, an electrical chamber 42, and a first microwave generating assembly 24. An antenna structure 100 can be mounted on the cooking cavity 22. The electrical chamber 42 is located on one side of the cooking cavity 22, and the first microwave generating assembly 24 is located in the electrical chamber 42. The first microwave generating assembly 24 includes a microwave source and a power supply, with the power supply connected to the microwave source. In the embodiment shown in FIG1, the microwave source includes a first magnetron 44, and the power supply includes a frequency converter 46, which supplies power to the first magnetron 44. When the first magnetron 44 is operating, it outputs microwaves through a microwave output window. The microwaves are transmitted to a feed port 14 via a first waveguide 12, and the slotted feed port 18 feeds the microwaves into the cooking cavity 26. It is understood that in other embodiments, the microwave source may include a radio frequency module.

[0125] In some embodiments, the microwave cooking appliance 200 includes a cooking cavity 22, with a feed plate 14 disposed on at least one of the top plate 28, bottom plate 32 and side plate 30 of the cooking cavity 22, and the side plate 30 of the cooking cavity 22 connecting the top plate 28 and the bottom plate 32 of the cooking cavity 22.

[0126] Therefore, the appropriate feed plate 14 can be configured according to the space of the microwave cooking appliance 200.

[0127] Specifically, in the embodiment shown in Figure 1, the feed plate 14 is disposed on the top plate 28 of the cooking cavity 22. Specifically, the cooking cavity 22 includes a U-shaped plate, and the top plate 28 of the U-shaped plate has a through hole 34. The feed plate 14 can cover the through hole 34, and the output part 38 of the first waveguide 12 can be connected to the outer surface of the top plate 28 and cover the through hole 34. When the microwave cooking appliance 200 starts the microwave mode, the first magnetron 44 operates to generate microwaves. The microwaves are transmitted through the first waveguide 12 and enter the cooking cavity 26 through the induced radiation of multiple incident waves of different phases via the slit feed plate 18, achieving uniform heating of the food.

[0128] In Figure 1, the microwave cooking appliance 200 also includes an inner partition 48. The bottom plate 32 of the cooking cavity 22 has 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 may be a turntable microwave cooking appliance.

[0129] In one embodiment, the feed plate 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, and the feed plate 14 can cover the through hole 34. The output part 38 of the first waveguide 12 can be connected to the lower side of the bottom plate 32 and cover the through hole 34.

[0130] In one embodiment, the feed plate 14 may 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 plate 14 may cover the through hole 34, and the output part 38 of the first waveguide 12 may be connected to the outer side surface of the side plate 30 and cover the through hole 34.

[0131] In one embodiment, the feed plate 14 may be disposed on any two or three of the top plate 28, bottom plate 32, and side plate 30 of the cooking cavity 22. In one embodiment, the side plate 30 includes the left side plate, right side plate, and rear side plate of the cooking cavity 22.

[0132] In some embodiments, the microwave cooking appliance 200 includes a first microwave generating component 24 and an electrical chamber 42, the electrical chamber 42 being located on the side of the cooking cavity 22, and the first microwave generating component 24 being located in the electrical chamber 42 and connected to a first waveguide 12.

[0133] Therefore, the electrical room 42 can protect the first microwave generating component 24 and prevent damage to the first microwave generating component 24 to a certain extent.

[0134] Specifically, in Figure 1, the electrical compartment 42 is located on the right side of the cooking cavity 22. A control panel can be installed on the front of the electrical compartment 42. The control panel can be electrically connected to the first microwave generating assembly 24 and is used to control the operation of the microwave cooking appliance 200. A door (not shown) is provided on the front of the cooking cavity 22. The door is rotatably connected to the cooking cavity 22, and an opening 52 communicating with the cooking cavity 26 is provided on the front of the cooking cavity 22. The door is used to open and close the opening 52. Optionally, the antenna structure 100 can also be provided on the door.

[0135] Optionally, the microwave cooking appliance 200 includes a housing (not shown) that covers the cooking cavity 22 and the electrical chamber 42 on the left side, the electrical chamber 42 on the right side, and on top of the cooking cavity 22 and the electrical chamber 42.

[0136] In some embodiments, the microwave cooking appliance 200 includes a cooling fan 54 located in the electrical compartment 42, which is used to cool the first microwave generating assembly 24.

[0137] Therefore, the first microwave generating component 24 can be operated at a suitable temperature to a certain extent.

[0138] Specifically, in Figure 1, the cooling fan 54 can be located behind the first microwave generating component 24. When the first microwave generating component 24 operates, it generates a large amount of heat, which the cooling fan 54 cools. In one embodiment, when the cooling fan 54 operates, it blows hot air from the electrical chamber 42 towards the rear of the microwave cooking appliance 200, cooling the first microwave generating component 24 and other components within the electrical chamber 42. In another embodiment, when the cooling fan 54 operates, it draws in cool air from the rear of the microwave cooking appliance 200, cooling the first microwave generating component 24 and other components within the electrical chamber 42.

[0139] In summary, the microwave cooking appliance 200 of this application can feed multi-phase microwaves through a multi-slit feed port 18 after waveguide mode conversion, replacing the original microwave stirring system, reducing the overall cost, improving microwave uniformity, and simplifying the size of the bottom appliance compartment by replacing the bottom microwave stirring system with a waveguide of the multi-slit feed port 18, effectively improving the overall volume ratio of the microwave cooking appliance 200.

[0140] In related technologies, a stirring system 302' as shown in Figure 27 is built into a microwave oven. It uses a physical method to stir the microwaves by driving a motor to rotate. However, the system structure occupies a large space, resulting in a low overall volume ratio.

[0141] Some embodiments according to this application are described below with reference to Figures 17 to 26.

[0142] As shown in Figure 17, the microwave generating assembly 300 proposed in this embodiment improves heating uniformity by providing second waveguide feed ports 306 on at least two first walls 3022 and equipping them with second waveguide antennas 308, allowing microwaves to enter the cavity from multiple directions. Furthermore, this design does not incorporate a traditional bottom stirring system. This significantly increases the cavity's volumetric efficiency, making the microwave oven design more compact and practical. Additionally, the absence of a complex stirring system results in a smoother interior cavity, making cleaning easier.

[0143] Specifically, the second housing 302 is the main structure of the entire microwave generating assembly 300, providing a sealed space for microwave heating. The second housing 302 includes multiple first walls 3022 and second walls 3024. The second walls 3024 have access ports 3026 for placing and removing food. As shown in Figure 18, the second magnetron 304 is responsible for generating microwaves. By placing the second magnetron 304 outside the second housing 302, the space occupied inside the cavity is reduced, while also facilitating heat dissipation and maintenance. Second waveguide feed ports 306 are located on two or more first walls 3022. Each second waveguide feed port 306 is equipped with a second waveguide antenna 308. The second waveguide feed ports 306 introduce the microwaves generated by the second magnetron 304 into the second housing 302 through the second waveguide antennas 308. The design of multiple second waveguide feed ports 306 and second waveguide antennas 308 allows microwaves to enter the cavity from multiple directions, improving the uniformity of microwave distribution. The second waveguide 310 is responsible for transmitting the microwaves generated by the second magnetron 304 to the second waveguide feed port 306, ensuring that the microwaves can be efficiently transmitted to the second waveguide feed port 306 and finally enter the interior of the second housing 302 to achieve uniform heating.

[0144] It is understandable that by setting two or more second waveguide feed ports 306, the heating effect can be effectively optimized according to the specific location of the second waveguide feed ports 306 and by adjusting the power distribution between the two second waveguide feed ports 306.

[0145] In some embodiments, the second waveguide feed port 306 is optionally selected as a rectangular opening. The design of the rectangular second waveguide feed port 306 can optimize the microwave transmission path and ensure efficient transmission and uniform distribution of microwave energy. The microwaves generated by the second magnetron 304 have the first wavelength when fed into the second waveguide 310 to ensure matching with the second waveguide 310 and the second waveguide feed port 306.

[0146] It is understandable that the dimensions of the rectangular second waveguide feed port 306 are designed based on the first wavelength to ensure optimal microwave transmission efficiency.

[0147] In some embodiments, optionally, the second magnetron 304 is disposed on the outside of a first wall 3022, and a second waveguide feed port 306 and the second magnetron 304 are disposed on the same first wall 3022. That is, the second waveguide feed port 306 and the second magnetron 304 are simultaneously disposed on the same first wall 3022, which helps to simplify the structure, reduce the overall size of the microwave oven, and make the design more compact. In addition, since the second magnetron 304 and the second waveguide feed port 306 are relatively concentrated, maintenance and replacement are more convenient.

[0148] It should be added that, as shown in Figure 19, by limiting the first distance L4 between the second waveguide feed port 306 and the waveguide output port 312 of the second magnetron 304 to a positive integer multiple of half the first wavelength, on the one hand, the reflection and standing waves of microwaves during transmission can be reduced, thereby improving microwave transmission efficiency; on the other hand, it can ensure that when the microwaves fed from the waveguide output port 312 are transmitted to the second waveguide feed port 306, they are at the top of the waveform and have greater energy.

[0149] In a specific embodiment, as shown in Figure 18, the second magnetron 304 is disposed on the outside of a first wall 3022. Two adjacent first walls 3022 are each provided with a second waveguide feed port 306, and a connecting edge 314 exists between the two adjacent first walls 3022. The second distance L5 is the shortest distance between the geometric center of the second waveguide feed port 306 of a first wall 3022 and the connecting edge 314. The third distance L6 is the shortest distance between the waveguide output port 312 of the second magnetron 304 and the connecting edge 314. By limiting the sum of the second and third distances to a positive integer multiple of half the first wavelength, the possibility of microwave transmission encountering reflection and forming standing waves in the waveguide can be reduced, thereby reducing energy loss and the possibility of uneven heating.

[0150] In another specific embodiment, a second waveguide feed port 306 is provided on the side wall and bottom wall of the second housing 302, and a second magnetron 304 is provided on one side wall where the second waveguide feed port 306 is provided, and is positioned below the second waveguide feed port 306. This enables direct transmission of microwaves from the second magnetron 304 to the second waveguide feed port 306, reducing the transmission path and thus improving transmission efficiency.

[0151] Because the second waveguide feed port 306 is distributed on the side and bottom walls, microwaves can enter the microwave oven cavity from both the bottom and sides, which helps to achieve multi-directional heating of food. The distribution of microwaves in the cavity is affected by the position of the second waveguide feed port 306. A reasonable layout can promote the uniform distribution of the electromagnetic field in the cavity and improve heating uniformity.

[0152] It is understandable that in this scheme, the second magnetron 304 is positioned between the two second waveguide feed ports 306 in the height direction, thus making full use of the space and making the path of microwave transmission to the second waveguide feed port 306 shorter, which is more conducive to increasing energy.

[0153] In one specific embodiment, optionally, the second magnetron 304 is located on the side wall of the second housing 302, and the second waveguide feed ports 306 are distributed on the side wall and the top wall, with the second magnetron 304 located above the second waveguide feed ports 306. This vertical arrangement facilitates the direct upward transmission of microwave energy from the second magnetron 304 to the second waveguide feed port 306 on the top wall, reducing the transmission path and thus improving transmission efficiency. Simultaneously, the vertical arrangement reduces obstacles that microwaves may encounter during transmission, thereby reducing energy loss.

[0154] Microwaves are emitted from the second magnetron 304 on the side wall and enter the cavity through the second waveguide feed port 306 on the top wall, realizing a three-dimensional heating method from top to bottom, which helps to improve the uniformity of heating. The second waveguide feed ports 306 are distributed on the side wall and the top wall, allowing microwaves to radiate to the food from different angles, increasing the heating coverage area.

[0155] With the above-mentioned relative position constraints, the layout of the second magnetron 304 and the second waveguide feed port 306 is more reasonable, achieving efficient microwave transmission, uniform heating effect, compact structural design and convenient maintenance process.

[0156] In one specific embodiment, optionally, the second waveguide feed port 306 is distributed on three adjacent first walls 3022 of the second housing 302, namely the side wall, top wall, and bottom wall. After microwave energy is emitted from the second magnetron 304, it enters the cavity through the second waveguide feed ports 306 on the side wall, top wall, and bottom wall, forming a three-dimensional microwave transmission network, which helps to improve the transmission efficiency of microwave energy.

[0157] Because the second waveguide feed port 306 is distributed on three different walls, obstruction and reflection during microwave transmission can be reduced, thereby reducing energy loss. Microwaves radiate into the food inside the cavity from three directions, achieving omnidirectional heating and helping to improve heating uniformity.

[0158] Understandably, the arrangement of three second waveguide feed ports 306 helps to create a more uniform electromagnetic field distribution within the cavity, thereby reducing hot and cold spots during the heating process.

[0159] In one specific embodiment, optionally as shown in FIG19, the second waveguide antenna 308 is provided with a plurality of second waveguide ports 3082. The second waveguide ports 3082 serve as openings on the antenna, enabling direct coupling of microwave energy from the waveguide to the microwave oven cavity and reducing energy loss during transmission. The position and size of the second waveguide ports 3082 are optimized; the second waveguide ports 3082 are rectangular, which allows adjustment of the microwave propagation direction and coverage area, thereby improving transmission efficiency.

[0160] Furthermore, the width of the second waveguide port 3082 is related to half the first wavelength, which facilitates the efficient transmission of microwaves in the waveguide, reduces reflections and standing waves, and thus improves transmission efficiency. An appropriate width of the second waveguide port 3082 can optimize the coupling process of microwave energy from the waveguide to the microwave oven cavity, ensuring efficient energy transfer.

[0161] The width of the second waveguide port 3082 is precisely designed to influence the radiation pattern of microwaves within the cavity, contributing to a more uniform heating effect. Appropriate selection of the width of the second waveguide port 3082 can control the diffusion angle of the microwave beam, further optimizing the microwave distribution within the cavity.

[0162] Furthermore, the second waveguide port 3082 of the two waveguide feed ports can be arranged in any combination of the forms shown in Figures 20, 21, 22, 23, 24 and 25.

[0163] The relationship between the width of the second waveguide port 3082 and the wavelength allows for optimization of the size of the second waveguide antenna 308 without sacrificing transmission efficiency, resulting in a more compact design. The adjustability of the width of the second waveguide port 3082 provides design flexibility, allowing its size to be adjusted according to the specific requirements of the microwave oven.

[0164] Furthermore, the width of the second waveguide port 3082 is within the range of fluctuation corresponding to half of the first wavelength. For example, if the first wavelength is 120mm, the width of the second waveguide port 3082 can be about 60mm.

[0165] In one specific embodiment, a dual-feed waveguide slot antenna and its microwave oven are provided. The slot waveguide antenna structure is used on the existing planar microwave L-shaped waveguide structure, thereby eliminating the bottom stirring motor and antenna structure, reducing the bottom space of the cavity by more than 50%. The specific implementation scheme is shown in Figure 18. Based on the original L-shaped waveguide, the magnetron installation position is first moved to a lower position in the cavity. Then, a rectangular waveguide feed port with a length of D1 and a width of W is added to the bottom of the cavity. At the same time, a rectangular waveguide feed port with a length of D2 and a width of W is added on the side near the magnetron.

[0166] Specifically, the following condition must be met: the distance from the center of the magnetron to the centers of the two waveguide feed ports (i.e., the sum of the first distance, the second distance, and the third distance) must be λ. g / 2 integer multiples.

[0167] Specifically, λ g This refers to the wavelength inside the waveguide. The conversion relationship between the wavelength inside the waveguide and the wavelength in free space is shown in the following equation:

[0168] Where, λ o Wavelength in air, λ g : Wavelength inside the waveguide, W: Width inside the waveguide, which is also the width of the waveguide feed port.

[0169] Regarding the slot openings of the two waveguide feed ports, i.e., the size of the waveguide ports, a waveguide slot antenna array structure is used. Based on 2.458 GHz, the slot opening size is approximately 60 mm, around half the wavelength. Due to interference from cavity boundary conditions, the feed port size may deviate slightly. The biggest advantage of this scheme lies in its two slot radiation ports, located at the bottom center and side respectively. When food is placed on the inner partition, microwaves can be radiated through both slots, ensuring that microwaves simultaneously heat both sides. Furthermore, by adjusting the energy distribution of the two feed ports, a uniform cooking effect can be achieved.

[0170] This application provides another embodiment of a cooking appliance 400, as shown in FIG26. The cooking appliance 400 includes a second housing 402 and a microwave generating assembly 300. The second housing 402 is the outer shell of a microwave oven, typically made of metal, used to protect the user from microwave radiation and to provide a structure to house the internal components.

[0171] Among them, cooking equipment 400 includes microwave ovens, microwave ovens, microwave-steam-grill combos, and other similar equipment.

[0172] According to the microwave generating assembly provided in this application, waveguide feed ports are provided on at least two first walls and equipped with waveguide antennas, so that microwaves can enter the cavity from multiple directions, thereby improving the uniformity of heating.

[0173] Some embodiments according to this application are described below with reference to Figures 28 to 41.

[0174] As shown in Figures 28 and 29, the microwave generating component 500 proposed in this embodiment includes a third housing 502, a third magnetron 504, a third waveguide 506, a third waveguide antenna 508, and a third waveguide feed port 5062. The third housing 502 is the main structure of the entire microwave oven, housing and protecting the components such as the third waveguide 506, the third waveguide feed port 5062, and the third magnetron 504 disposed inside the third housing 502. The third magnetron 504 is used to generate microwave energy. At least partially, the third magnetron 504 is located outside the third housing 502 and is connected to the third waveguide feed port 5062 via the third waveguide 506. The third waveguide 506 is used to transmit the microwave energy emitted by the third magnetron 504. The third waveguide feed port 5062 can feed the microwave energy transmitted by the third waveguide 506 into the third housing 502 through the third waveguide antenna 508. By placing the third waveguide antenna 508 on the third waveguide feed port 5062 and providing multiple third waveguide ports 5082 on the third waveguide antenna 508, microwave energy can be uniformly distributed inside the cavity through the multiple third waveguide ports 5082 under the action of the third waveguide antenna 508. As shown in Figure 34, since the third waveguide antenna 508 is divided into multiple sub-regions 5084 arranged around the geometric center, and each sub-region 5084 is provided with some or an integer number of third waveguide ports 5082, the distribution of microwave energy is thus achieved.

[0175] In one specific embodiment, multiple third waveguide ports 5082 are uniformly arranged around the geometric center of the third waveguide feed port 5062, and the uniform distribution of microwave energy is achieved through the uniform arrangement of multiple third waveguide ports 5082.

[0176] In one specific embodiment, as shown in Figure 30, the initial width L7 of the third waveguide 506 is 80 mm, and then gradually changes to L8, specifically 173 mm, after reaching the top of the cavity.

[0177] It is important to emphasize that the design of the top-mounted third waveguide antenna 508 and multiple third waveguide ports 5082 eliminates the need for a bottom stirring system and antenna structure, freeing up space at the bottom of the cavity. This significantly improves the overall volume ratio, simplifies the internal structure, reduces the number of components, and thus lowers production costs. Simultaneously, microwave energy can be evenly distributed within the cavity, achieving uniform heating of the food.

[0178] The specific shapes of the third waveguide antenna 508 and the third waveguide port 5082 can be shown in Figures 34, 35, 36, 37 and 38. Of course, this application does not protect the specific shapes, and the above shapes are only examples.

[0179] Because the third waveguide antenna 508 on the top of the third housing 502 has multiple evenly arranged third waveguide ports 5082, when food is placed in the inner partition of the third housing 502, microwaves can be radiated through the third waveguide ports 5082 at different positions, thereby ensuring that microwaves can heat the food on both sides of the inner partition at the same time. Furthermore, the energy distribution can be changed by adjusting the position of different feed ports, so as to achieve a uniform cooking effect.

[0180] In some embodiments, optionally, the width of the third waveguide port 5082 is numerically limited, and the wavelength of the microwave generated by the third magnetron 504 fed into the third waveguide 506 is a first wavelength λ. g This is to ensure matching with the third waveguide 506 and the third waveguide feed port 5062. This is achieved by limiting the width of the third waveguide port 5082 to half the first wavelength, i.e., the width of the third waveguide port is λ. g / 2, microwaves do not experience unnecessary reflections or energy losses during transmission, thus ensuring the effective transmission and uniform distribution of microwave energy.

[0181] Furthermore, the width of the third waveguide port 5082 is greater than or equal to 10 mm.

[0182] In some embodiments, the third waveguide port 5082 may optionally be rectangular in shape. A rectangular via can provide stable microwave radiation and contribute to the uniform distribution of microwave energy. The dimensions of the rectangular via need to be precisely designed according to the wavelength and the desired microwave energy distribution to avoid energy loss and ensure uniform heating.

[0183] In one specific embodiment, the third waveguide port 5082 can be arc-shaped. The arc-shaped via provides a microwave radiation mode different from that of a rectangular via, allowing for a more complex microwave field distribution. The arc-shaped via helps improve the propagation path of microwave energy within the cavity, reducing hot and cold spots and further enhancing heating uniformity. Of course, the design of the arc-shaped via needs to consider the reflection and refraction characteristics of microwaves to optimize microwave propagation efficiency within the cavity.

[0184] Among them, the third waveguide port 5082 with different shapes can provide different microwave radiation modes, which helps to optimize the distribution of microwave field.

[0185] In another specific embodiment, the axisymmetric arrangement of multiple third waveguide ports 5082 helps to uniformly distribute microwave energy within the cavity, reducing hot and cold spots during the heating process, thereby achieving uniform heating of food. The axisymmetric layout of the third waveguide ports 5082 creates a more uniform and optimized microwave field, thus improving heating efficiency.

[0186] It is understandable that the axisymmetric design simplifies the distribution pattern of microwave energy.

[0187] In one specific embodiment, optionally, the multiple third waveguide ports 5082 are arranged in a centrally symmetrical manner, which helps to distribute microwave energy evenly within the cavity, reducing hot and cold spots during the heating process, thereby achieving uniform heating of food. The centrally symmetrical arrangement of the third waveguide ports 5082 creates a more uniform and optimized microwave field, thereby improving heating efficiency.

[0188] For the entire system, the position and design of the third waveguide feed port 5062, which serves as the entry point for microwave energy into the cavity, are crucial to the overall system performance. The third waveguide antenna 508 connects the third waveguide feed port 5062 and the third magnetron 504, transmitting microwave energy to the third enclosure 502. A more uniform and optimized microwave field can be created through the centrally symmetrical layout of the third waveguide feed port 5062.

[0189] It is understandable that by centrally symmetrically arranging the third waveguide 5082, not only is heating efficiency and food quality improved, but the design and commissioning process of the microwave cooking system is also simplified. By precisely controlling the number, shape, size, and layout of the third waveguide 5082, the performance of the microwave oven and the user experience can be significantly enhanced.

[0190] In one specific embodiment, optionally, a reflector 510 is provided inside the third enclosure 502 and positioned on the wall opposite the third waveguide feed port 5062, thereby further optimizing the distribution and reflection of microwave energy. The reflector 510 reflects microwave energy, causing it to reflect multiple times within the third enclosure 502, thus improving microwave energy utilization. The reflector 510 helps to alter the microwave propagation path within the cavity, reducing energy loss and improving heating efficiency and uniformity. The design of the reflector 510 reduces blind spots within the cavity, ensuring that microwave energy covers every corner of the cavity.

[0191] The reflector 510 is located inside the third housing 502, opposite the third waveguide feed port 5062, and is used to reflect microwave energy. The third waveguide feed port 5062 is located on the wall of the third housing 502 and is used to transmit microwave energy to the cavity. The reflector 510 and the third waveguide feed port 5062 are respectively located on two opposite walls in the third housing 502, which helps to achieve uniform distribution of microwave energy.

[0192] It should be added that the reflector 510 can be selected from a specular reflective surface as shown in Figure 40, or a diffuse reflective surface as shown in Figure 41.

[0193] Furthermore, the material of the reflector 510 needs to have good microwave reflection performance, while also considering factors such as high temperature resistance and corrosion resistance. The size and shape of the reflector 510 need to be designed according to the size and shape of the cavity to ensure effective reflection and distribution of microwave energy. By adjusting the position of the reflector 510, the distribution of microwave energy within the cavity can be further controlled, achieving more precise heating control.

[0194] Among them, the reflector 510 optimizes the propagation path of microwave energy in the cavity by reflecting microwave energy, reducing energy loss and heating blind zone, thereby improving heating efficiency and uniformity.

[0195] Of course, by precisely controlling the number, position, size, and shape of the reflectors 510, the performance of the microwave oven and the user experience can be further improved.

[0196] In one specific embodiment, diffuse reflection as shown in FIG41 can be optionally implemented. The specific structure is shown in FIG31. The reflector 510 includes a substrate 5102 and a diffuse reflection portion 5104, further optimizing the distribution and reflection of microwave energy. The diffuse reflection portion 5104 allows microwave energy to be distributed more evenly within the cavity, reducing hot and cold spots and improving heating efficiency. Furthermore, the diffuse reflection portion 5104 helps improve the propagation path of microwave energy within the cavity, reducing energy loss and improving heating uniformity. Through the design of the diffuse reflection portion 5104, it is ensured that food is heated more evenly within the microwave oven cavity, thereby enhancing the user's cooking experience.

[0197] The substrate 5102, as the main structure of the reflector 510, is typically made of a material with good microwave reflection properties. A diffuse reflection section 5104 is provided on the side of the substrate 5102 facing the third waveguide feed port 5062 to optimize the distribution of microwave energy.

[0198] The diffuse reflector 5104 optimizes the propagation path of microwave energy within the cavity, improving energy distribution and heating uniformity. By precisely controlling the number, position, size, and shape of the diffuse reflector 5104, the microwave oven's performance and user experience can be further enhanced.

[0199] In one specific embodiment, optionally as shown in Figures 32 and 33, the diffuse reflection portion 5104 includes at least one of a protrusion 5122 and a recess 5124. Microwaves are reflected when they are transmitted to the protrusion 5122. Because the surface of the protrusion 5122 is not parallel to the substrate 5102, the microwaves undergo diffuse reflection. Similarly, microwaves are also diffusely reflected when they are transmitted to the recess 5124. The non-parallel design of the surfaces of the protrusion 5122 and the recess 5124, under the action of at least one of the protrusion 5122 and the recess 5124, allows for a more uniform distribution of microwave energy within the cavity.

[0200] The specific shapes of the protrusions 5122 and the recesses 5124 are not limited, as long as their surfaces are not parallel to the substrate 5102.

[0201] In some embodiments, the reflector 510 and the third waveguide feed port 5062 can optionally be disposed on different walls of the third housing 502, which can optimize the distribution and reflection of microwave energy. Specifically, the reflector 510 and the third waveguide feed port 5062 can be disposed on the top and bottom walls of the third housing 502, respectively, or they can be disposed on the left and right side walls of the third housing 502, respectively. By adjusting the positions of the reflector 510 and the third waveguide feed port 5062, the propagation path of microwave energy in the cavity can be improved, energy loss can be reduced, and heating efficiency can be improved.

[0202] Of course, the different layouts of the reflector 510 and the third waveguide feed port 5062 help to improve the uniformity of microwave energy in the cavity, thereby improving the heating uniformity.

[0203] By employing different layouts for the reflector 510 and the third waveguide feed port 5062, the propagation path of microwave energy within the cavity can be optimized, improving energy distribution and heating uniformity. Furthermore, the number, position, size, and shape of the reflector 510 and the third waveguide feed port 5062 can be precisely controlled, thereby enhancing the microwave oven's performance and user experience.

[0204] This application provides another embodiment of a cooking appliance 600, as shown in FIG39. The cooking appliance 600 includes a third housing 602 and a microwave generating assembly 500. The third housing 602 is the outer shell of the microwave oven, typically made of metal, used to protect the user from microwave radiation and providing a structure to house the internal components. Since the cooking appliance 600 includes any of the aforementioned microwave generating assemblies 500, it possesses the beneficial effects of any of the aforementioned microwave generating assemblies 500, which will not be elaborated further here.

[0205] Among them, cooking equipment 600 includes microwave ovens, microwave ovens, microwave-steam-grill combos, and other similar equipment.

[0206] In one specific embodiment, a novel multi-feed waveguide and its microwave oven are proposed for use in microwave cooking systems. This effectively addresses the need for uniform food cooking and improves the overall volume ratio, solving the problem of low volume ratio in traditional flatbed microwave ovens. Based on the existing flatbed microwave oven structure, this embodiment innovatively uses a top-slotted third waveguide antenna structure, thereby eliminating the need for a bottom stirring motor and antenna structure, reducing the bottom space of the cavity by more than 50%. The specific implementation is as follows: First, a third waveguide is installed at the top of the original cavity structure, with an initial width of 80mm, gradually decreasing to 173mm after reaching the top of the cavity. Second, a large feed plate (i.e., microwave antenna) is installed below the top waveguide. Three slot openings (i.e., third waveguide openings) of different sizes are set on the feed plate to radiate microwave energy into the cavity to heat the food. The length of each slot opening is λ. g / 2, the width is generally 10mm or more, mainly to prevent microwave arcing and breakdown caused by insufficient gaps. The biggest advantage of this design lies in its multiple radiating slots, evenly arranged around the center. When food is placed on the inner partition, microwaves are radiated through different slots, ensuring that the microwaves simultaneously heat the food on both sides of the inner partition. Furthermore, by adjusting the position of different slots, the energy distribution can be changed to achieve uniform cooking. In addition, this design innovatively introduces a bottom diamond surface with a diffuse reflection structure, which can effectively change the microwave transmission path, thereby achieving uniform heating.

[0207] Specifically, λ g This refers to the wavelength within the third waveguide, which is the first wavelength. The conversion relationship between the wavelength within the third waveguide and the wavelength in free space is shown in the following formula:

[0208] Where λ0: wavelength in air, λ g : Wavelength inside the waveguide, W: Width inside the waveguide, which is also the width of the waveguide feed port.

[0209] The beneficial effects of this embodiment are as follows: By introducing a multi-feed antenna structure, the space occupied by the stirring system at the bottom of the cavity can be reduced, the overall volume ratio can be greatly improved, and the cost can be reduced. This solution sets waveguide slot structures at multiple positions on the top of the cavity, which can adjust the power distribution of different feed ports, reduce the microwave distribution blind zone near the sides of the bottom of the cavity, achieve a uniform heating effect, and thus improve the user experience. In addition, this solution adds a diamond diffuse reflection structure at the bottom of the partition plate inside the cavity to change the microwave transmission direction, thereby improving the heating uniformity of the whole machine.

[0210] According to the microwave generating component provided in this application, since multiple waveguide ports are uniformly arranged around the geometric center of the waveguide feed port, the uniform arrangement of multiple waveguide ports achieves a uniform distribution of microwave energy.

[0211] In this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection; "link" can mean a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0212] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0213] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0214] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An antenna structure for a microwave cooking appliance, wherein, The antenna structure comprises: a first waveguide provided with a microwave output port; a feed patch mounted at the microwave output port, the feed patch being provided with a plurality of slot feeds, the plurality of slot feeds including a first slot feed, the first slot feed being provided at a voltage antinode point of the waveguide.

2. The antenna structure of claim 1, wherein, The plurality of slot feeds includes a second slot feed, the second slot feed being provided at a current antinode point of the first waveguide.

3. The antenna structure of claim 2, wherein, The first waveguide includes an input portion and an output portion connected to each other, the input portion being provided with a microwave input port, the output portion being provided with the microwave output port, the output portion having a width W2 and a length L2, the voltage antinode point of the first waveguide being arranged along an axis of W2x1 / 2, the current antinode point of the first waveguide being arranged along an axis of L2x1 / 3 and along an axis of L2x2 / 3.

4. The antenna structure of claim 3, wherein, W2 is 65mm to 200mm, and L2 is 150mm to 220mm.

5. The antenna structure of claim 3, wherein, The input portion has a width W1, and W1 is 65mm to 95mm.

6. The antenna structure of claim 1, wherein, The slot feed has a width W3 and a length L3, wherein L3 is 45mm to 70mm, and W3 is 12mm to 30mm.

7. A microwave cooking appliance, wherein The microwave cooking appliance comprises the antenna structure according to any one of claims 1-6.

8. The microwave cooking appliance according to claim 7, wherein, The microwave cooking appliance comprises a cooking cavity, the feed patch being provided on at least one of a top plate, a bottom plate and a side plate of the cooking cavity, the side plate connecting the top plate and the bottom plate of the cooking cavity.

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

10. The microwave cooking appliance according to claim 9, wherein, The microwave cooking appliance comprises a cooling fan, the cooling fan being located in the electrical chamber and used for cooling the first microwave generating assembly.

11. A microwave generating assembly, wherein, The microwave cooking appliance comprises: a second box body comprising a plurality of first walls and a second wall, the second wall being provided with a taking and placing opening; a second magnetron at least partially located outside the second box body; a second waveguide feed provided on at least two of the first walls, each of the second waveguide feeds being provided with a second waveguide antenna; a second waveguide, one end of the second waveguide being connected to the second magnetron, and the other end of the second waveguide being connected to the second waveguide feed; wherein the microwave emitted by the second magnetron is fed into the second box body through the second waveguide antennas on the at least two first walls.

12. The microwave generating assembly of claim 11, wherein, The second waveguide feed is in a rectangular shape, and the wavelength of the microwave fed into the second waveguide by the second magnetron is a first wavelength.

13. The microwave generating assembly according to claim 12, wherein the second magnetron is located outside one of the first walls, one of the second waveguide feeds is located on the same first wall as the second magnetron, and a first distance between the geometric center of the second waveguide feed on the same first wall and the waveguide output port of the second magnetron is a positive integer multiple of half of the first wavelength.

14. The microwave generating assembly of claim 12, wherein, The second waveguide feed port is arranged on two adjacent first walls, and a connecting edge is arranged between the two adjacent first walls. One of the two adjacent first walls is provided with the second magnetron, and the shortest distance between the geometric center of the second waveguide feed port of the other first wall and the connecting edge is a second distance. The shortest distance between the waveguide output port of the second magnetron and the connecting edge is a third distance. The sum of the second distance and the third distance is an integer multiple of half of the first wavelength.

15. The microwave generating assembly of claim 11, wherein, The two adjacent first walls are a side wall and a bottom wall of the second box body, and the second waveguide feed port is arranged on the first wall. The second magnetron is arranged on the side wall and below the second waveguide feed port.

16. The microwave generating assembly of claim 11, wherein, The two adjacent first walls are a side wall and a top wall of the second box body, and the second waveguide feed port is arranged on the first wall. The second magnetron is arranged on the side wall and above the second waveguide feed port.

17. The microwave generating assembly of claim 11, wherein, The second waveguide feed port is arranged on three adjacent first walls, and the three adjacent first walls are a side wall, a top wall and a bottom wall of the second box body.

18. The microwave generating assembly of claim 12, wherein The second waveguide antenna is provided with a plurality of second waveguide ports, and the second waveguide ports are rectangular.

19. The microwave generating assembly of claim 18, wherein, The width of the second waveguide port is related to half of the first wavelength.

20. A cooking apparatus wherein, It comprises: A second housing; The microwave generating assembly of any one of claims 11 to 19 is arranged in the second housing.

21. A microwave generating assembly, wherein, It comprises: A third box body; A third magnetron arranged at least partially outside the third box body; A third waveguide feed port arranged on a wall surface of the third box body, and the third waveguide feed port is provided with a third waveguide antenna; A third waveguide tube, one end of the third waveguide tube is connected with the third magnetron, and the other end is connected with the third waveguide feed port. The microwave emitted by the third magnetron is fed into the interior of the third box body through the third waveguide tube and the third waveguide antenna. The third waveguide antenna is provided with a plurality of third waveguide ports, and the third waveguide antenna comprises a plurality of sub-regions arranged around the geometric center of the third waveguide feed port. At least part of the third waveguide ports are arranged in each sub-region.

22. The microwave generating assembly of claim 21, wherein, The wavelength of the microwaves fed into the third waveguide by the third magnetron is a first wavelength λ g , The width of the third waveguide port is λ g / 2.

23. The microwave generating assembly of claim 22, wherein, The shape of the third waveguide port comprises a rectangular through hole and / or an arc-shaped through hole.

24. The microwave generating assembly of claim 21, wherein, The plurality of third waveguide ports are arranged in axial symmetry with respect to the symmetry axis passing through the geometric center of the third waveguide feed port.

25. The microwave generating assembly of claim 21, wherein, The plurality of third waveguide ports are arranged in central symmetry with respect to the geometric center of the third waveguide feed port.

26. The microwave generating assembly of any one of claims 21 to 25, wherein, It further comprises: A reflecting plate arranged in the third box body, and the reflecting plate and the third waveguide feed port are arranged on two opposite wall surfaces in the third box body.

27. The microwave generating assembly of claim 26, wherein, The reflecting plate comprises: A substrate, and a diffuse reflection part is arranged on one side of the substrate facing the third waveguide feed port.

28. The microwave generating assembly of claim 27, wherein, The diffuse reflection part comprises: A convex part, and the surface of the convex part is not parallel to the substrate; and / or A concave part, and the surface of the concave part is not parallel to the substrate.

29. The microwave generating assembly of claim 26, wherein The reflection plate and the third waveguide feed port are arranged on the top wall and the bottom wall of the third box body; or The reflection plate and the third waveguide feed port are arranged on the left side wall and the right side wall of the third box body.

30. A cooking apparatus wherein, Comprise: A third housing; The microwave generating assembly according to any one of claims 21 to 29 is arranged in the third housing.

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