Microwave cooking utensil

Abstract

The utility model particularly relates to a microwave cooking utensil which comprises a machine body, a microwave generating device and an antenna assembly, the antenna assembly comprises an antenna body, and the antenna body can rotate and guide microwaves generated by the microwave generating device into a cooking cavity. The antenna body is of a plate-shaped structure and is provided with a preset area, at least one feed port is formed in the preset area, the distance between the geometric center of the preset area and the rotating axis is larger than or equal to 1 / 3 of the wavelength of microwaves and smaller than or equal to 2 / 3 of the wavelength in the first direction, and the first direction is the arrangement direction of the preset area and the rotating axis of the antenna body. In the second direction, the antenna body has a first width smaller than the wavelength, the preset area is symmetrically arranged with the rotation axis as the center, and the second direction is perpendicular to the first direction. According to the microwave cooking utensil, most microwaves are mainly radiated out from one side of the antenna body, and directional heating of food can be achieved.

Description

Microwave cooking appliances Technical Field

[0001] This utility model relates to the field of microwave heating technology, specifically to a microwave cooking appliance. Background Technology

[0002] When cooking food, microwave cooking appliances use a microwave generator to feed microwaves into the cooking cavity and use microwaves to heat and cook the food.

[0003] However, in the existing technology, when two types of food (the same ingredients but different initial temperatures, or different ingredients) are cooked simultaneously, the temperature difference between the two types of food is large at the end of cooking, which reduces the cooking effect. Summary of the Invention

[0004] The purpose of this invention is to at least solve the problem of significant temperature differences at the end of cooking when microwave cookers are used to cook two types of food. This purpose is achieved through the following technical solution:

[0005] This utility model discloses a microwave cooking appliance, which includes:

[0006] The body is provided with a cooking cavity, the cooking cavity including a microwave feed position;

[0007] A microwave generator is disposed inside the machine body and located outside the cooking cavity;

[0008] An antenna assembly, comprising an antenna body disposed at the microwave feed position, the antenna body being rotatable and used to guide microwaves generated by a microwave generator into the cooking cavity;

[0009] The antenna body is a plate-shaped structure with a preset area. At least one feed port is provided within the preset area so that the impedance of the antenna body outside the preset area is less than the impedance of the preset area. Along a first direction, the distance between the geometric center of the preset area and the rotation axis is a first spacing. The first spacing is greater than or equal to 1 / 3 of the wavelength of the microwave and less than or equal to 2 / 3 of the wavelength of the microwave. The first direction is the alignment direction of the preset area and the rotation axis of the antenna body. Along a second direction, the antenna body has a first width, which is less than the wavelength of the microwave. The second direction is perpendicular to the first direction. Along the second direction, the preset area is symmetrically arranged with the rotation axis as the center.

[0010] The microwave cooking appliance of this invention, by setting a preset area on one side of the antenna body, can form impedance sections of varying heights. This allows microwaves entering the antenna body to primarily radiate from the feed port of the preset area. Simultaneously, by setting the first spacing within the range of 1 / 3 to 2 / 3 of the wavelength, the feed port is placed in a strong microwave field, thus facilitating directional heating of food. Furthermore, by setting the first width of the antenna body to be smaller than the wavelength, the impedance on both sides of the antenna body in the second direction is reduced, allowing most microwaves to radiate from the feed port. This further enhances the directional radiation effect of the antenna body and helps solve the problem of significant temperature differences at the end of cooking when cooking two types of food in existing microwave cooking appliances.

[0011] Furthermore, by setting a preset area symmetrically around the rotation axis, the antenna body can be made symmetrical in the second direction, thus preventing it from wobbling during rotation. Moreover, by defining the position of the preset area, the orientation of the area can be better controlled in conjunction with the rotation of the antenna body. This allows for better projection of microwaves onto foods with lower temperatures or slower heating rates, thereby increasing the heating speed while achieving simultaneous heating and ensuring the effectiveness of the microwave cooking appliance. Additionally, by setting the first width of the antenna body to be smaller than the wavelength, the actual size of the antenna body can be reduced, lowering manufacturing costs.

[0012] In addition, the microwave cooking appliance according to this utility model may also have the following additional technical features:

[0013] In some embodiments of this utility model, the number of feed ports is set to one, and the feed port is a rectangular structure;

[0014] Along the second direction, the feed port has a first length, which is less than or equal to the wavelength of the microwave and greater than or equal to 1 / 4 of the wavelength of the microwave. Along the first direction, the feed port has a second length, which is in the range of 8 mm to 15 mm.

[0015] In some embodiments of this utility model, the number of feed ports is set to two, and the two feed ports are spaced apart along the second direction.

[0016] In some embodiments of this utility model, the feed opening includes two slits, and the two slits are arranged intersectingly;

[0017] Alternatively, the feed opening may include two slits, and the two slits may be arranged in parallel.

[0018] In some embodiments of this utility model, the antenna body is configured with arc-shaped structures on two edges along the first direction, and the arc-shaped structures protrude in a direction away from the rotation axis.

[0019] In some embodiments of this utility model, a first compensation port is provided on the antenna body, and along the first direction, the first compensation port and the preset area are respectively arranged on opposite sides of the rotation axis;

[0020] Furthermore, along the second direction, the first compensation port is symmetrically arranged with the rotation axis as the center.

[0021] In some embodiments of this utility model, along the first direction, there is a second distance between the first compensation port and the rotation axis, and the second distance is smaller than the first distance.

[0022] In some embodiments of this utility model, the antenna body further has a second compensation port, which is disposed between the preset area and the rotation axis, and the opening area of ​​the second compensation port is smaller than the opening area of ​​the first compensation port.

[0023] In some embodiments of this utility model, along the first direction, there is a third distance between the second compensation port and the rotation axis, and the third distance is greater than or equal to the second distance.

[0024] In some embodiments of this utility model, along the first direction, the distance between the rotation axis and the two edges of the antenna body is the same;

[0025] And / or, the microwave generating device includes a magnetron and a waveguide, one end of the waveguide is connected to the magnetron, the other end of the waveguide is connected to the outer wall of the cooking cavity and is positioned opposite to the microwave feed position, the antenna body is provided with a sleeve portion, the sleeve portion extends into the waveguide and is coaxially arranged with the rotation axis, the sleeve portion is used to guide the microwave in the waveguide to the antenna body, the antenna assembly also includes a driving member, the driving member is disposed outside the waveguide and located outside the cooking cavity, the driving shaft of the driving member passes through the waveguide and is inserted and fixed to the sleeve portion. Attached Figure Description

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0027] Figure 1 is a schematic diagram of one structure of the antenna body according to an embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of another structure of the antenna body shown in this embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of the third structure of the antenna body shown in the embodiment of this utility model;

[0030] Figure 4 is a schematic diagram of the fourth structure of the antenna body shown in the embodiment of this utility model;

[0031] Figure 5 is a schematic diagram of the heating simulation of the antenna body shown in Figure 1 when the microwave cooking appliance is stationary.

[0032] The markings in the attached diagram are as follows:

[0033] 10. Antenna body;

[0034] 20. Connecting part;

[0035] 30. Preset area;

[0036] 40. Feed opening; 41. Gap;

[0037] 50. First compensation port;

[0038] 60. Second compensation port;

[0039] L1, first spacing; L2, second spacing; L3, third spacing; D, first width;

[0040] h, length; d, width. Detailed Implementation

[0041] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0042] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0043] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0044] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0045] In most existing flatbed microwave ovens, the microwave feed port is located at the bottom of the cavity. In this case, the microwaves are emitted from the magnetron and guided into the cavity through the coupling window at the end of the waveguide to achieve uniform heating.

[0046] When faced with two plates of food with different initial temperatures or different types of ingredients, in order to ensure that the food is heated evenly and that the temperature is basically the same when cooking is finished, the microwaves cannot be distributed completely evenly in the cavity. Instead, the microwaves need to radiate in a directional manner, concentrating and heating a certain small area evenly, while minimizing the consumption of microwaves in other areas.

[0047] However, most existing microwave ovens use a mode stirrer to disturb the feed port and its surrounding boundaries to evenly disperse microwaves into the cavity. However, by changing the boundary conditions near the feed port to control the microwaves, it is impossible to clearly focus and guide the microwaves, and it is impossible to effectively heat food in a directional manner. Therefore, it is impossible to meet the working conditions of heating two dishes at the same time (different ingredients or with large differences in initial temperature).

[0048] To address the aforementioned technical problems, this application provides a microwave cooking appliance to solve the problem of significant temperature differences at the end of cooking when cooking two types of food in existing microwave cooking appliances.

[0049] It should be noted that, in the following embodiments, a microwave oven is used as an example to describe the microwave cooking appliance described herein. However, it is not limited to this; devices that utilize microwave heating, waste disposal units, or semiconductor manufacturing apparatuses can all be arranged with reference to the structure described herein. Furthermore, this application is not limited to the specific structures shown in the following embodiments, but includes structures based on the same technical concept.

[0050] In terms of overall design, the microwave cooking appliance includes a body, a microwave generator, and an antenna assembly. The body has a cooking cavity with a space for holding items to be heated. Optionally, the cooking cavity can hold at least two portions of food. The cooking cavity also includes a microwave feed point. The microwave generator is located inside the body and outside the cooking cavity.

[0051] The microwave generator is located inside the machine body and outside the cooking cavity. At this location, the microwave generator produces microwaves and transmits them to the antenna assembly. Simultaneously, the antenna assembly includes an antenna body positioned at the microwave feed point. The antenna body is rotatable and used to guide the microwaves generated by the microwave generator into the cooking cavity.

[0052] At this time, the antenna body 10 has a plate-like structure and a preset region 30. At least one feed port 40 is provided within the preset region 30 to ensure that the impedance of the antenna body 10 outside the preset region 30 is less than the impedance of the preset region 30. Along the first direction a, the distance between the geometric center of the preset region 30 and the rotation axis is a first spacing, which is greater than or equal to 1 / 3 of the microwave wavelength and less than or equal to 2 / 3 of the microwave wavelength. The first direction a is the alignment direction of the preset region 30 and the rotation axis of the antenna body 10. Simultaneously, along the second direction b, the antenna body 10 has a first width D, which is less than the microwave wavelength. The second direction b is perpendicular to the first direction a. Along the second direction b, the preset region 30 is symmetrically arranged about the rotation axis.

[0053] Specifically, by setting a preset region 30 on one side of the antenna body 10, different impedance sections can be formed. This allows microwaves to be mainly radiated from the feed port 40 of the preset region 30 after entering the antenna body 10. Simultaneously, by setting the value of the first spacing L1 within the range of 1 / 3 to 2 / 3 of the wavelength, the feed port 40 can be placed in a strong microwave field, thus facilitating directional heating of food. Furthermore, by making the first width D of the antenna body 10 smaller than the wavelength, the impedance of the antenna body 10 in the second direction b can be reduced, allowing most microwaves to be radiated from the feed port 40. This further enhances the directional radiation effect of the antenna body 10, thereby solving the problem of significant temperature differences at the end of cooking when cooking two types of food in existing microwave cookers.

[0054] Furthermore, by setting the preset region 30 symmetrically around the rotation axis, the antenna body 10 can be made symmetrical in the second direction b, thus preventing the antenna body 10 from wobbling during rotation. Moreover, by defining the position of the preset region 30, the orientation of the preset region 30 can be better controlled in conjunction with the rotation of the antenna body 10, allowing it to better direct microwaves onto foods with lower temperatures or slower heating rates. This improves the heating speed of food while achieving simultaneous heating, ensuring the effectiveness of the microwave cooking appliance. Additionally, by setting the first width D of the antenna body 10 to be smaller than the wavelength, the actual size of the antenna body 10 can be reduced, lowering manufacturing costs.

[0055] It is important to understand that the cooking cavity contains a platform for holding food, and a microwave feed space is located below the platform. The antenna body 10 is rotatably positioned within this microwave feed space and radiates heat upwards towards the platform. Simultaneously, the microwave generator includes a magnetron and a waveguide. The magnetron is located within the machine body and on the outside of the cooking cavity. One end of the waveguide is connected to the magnetron, and the other end is connected to the outer wall of the cooking cavity and located below the microwave feed space. The other end of the waveguide is positioned opposite the microwave feed position. Furthermore, the antenna body 10 has a sleeve that extends into the waveguide and is coaxial with the rotation axis. This sleeve guides the microwaves from the waveguide to the antenna body 10.

[0056] In this embodiment, the antenna assembly further includes a driving component, which is disposed outside the waveguide and located outside the cooking cavity. The driving shaft of the driving component passes through the waveguide and is inserted and fixed to the sleeve portion. Specifically, vertically downward, the microwave feed space, the waveguide, and the driving component are arranged sequentially. The driving shaft of the driving component passes through the waveguide and extends into the microwave feed space to connect with the antenna body 10. Optionally, the microwave cooking appliance also includes a rotary motor. In this case, the rotary motor is connected to the antenna body 10 and enables the antenna body 10 to rotate around the driving shaft of the rotary motor.

[0057] The antenna body 10 is a metal component with a plate-like structure. A connecting portion 20 is provided on the antenna body 10 for connecting to the drive shaft of a rotary motor, allowing the antenna body 10 to rotate around the drive shaft. As shown in Figures 1 and 4, the connecting portion 20 is a through hole. In this case, the antenna body 10 can be connected to the drive shaft via a fastener passing through the through hole, ensuring that the axis of the through hole is collinear with the axis of the drive shaft. Optionally, the fastener is screwed to the drive shaft; the fastener can be a screw, bolt, or stud. By making the connecting portion 20 a through hole, the manufacturing difficulty of the antenna body 10 is effectively reduced, the manufacturing efficiency of the antenna body 10 is improved, and the impact of the through hole on microwave transmission is reduced, ensuring the performance of the microwave cooking appliance.

[0058] In this embodiment, along the first direction a, the distance between the connecting portion 20 and the two edges of the antenna body 10 is the same. Meanwhile, as shown in Figures 1 and 4, along the second direction b, the connecting portion 20 is located in the central region of the antenna body 10. In this case, the distance between the connecting portion 20 and the two edges of the antenna body 10 in the second direction b is the same, which helps to ensure more uniform microwave radiation in the second direction b. When the rotary motor is working, because the connecting portion 20 is the same length from the left and right sides of the antenna body 10, and the antenna body 10 is a plate-like structure with uniform thickness, the weight on the left and right sides of the antenna body 10 is relatively consistent. This makes it less prone to shaking when the antenna body 10 rotates, and the amount of microwaves passing through the left and right sides of the antenna body 10 is the same or similar, making it easier to achieve overall uniformity in food heating.

[0059] It should be understood that, as shown in Figures 1-4, along the first direction a, the preset region 30 is disposed on one side of the connecting part 20, and has a first spacing L1 between it and the connecting part 20. The value of the first spacing L1 is in the range of 1 / 3 to 2 / 3 of the wavelength λ inside the tube, that is, 1 / 3λ≤L1≤2 / 3λ. Since the microwave field strength is relatively large and the microwave transmission efficiency is relatively high when the distance from the axis of the antenna body 10 is 1 / 3λ to 2 / 3λ, by limiting the value of the first spacing L1 to the range of 1 / 3λ to 2 / 3λ, the microwave flow in the preset region 30 can be effectively guaranteed, thereby further improving the heating effect of the preset region 30. Optionally, the first spacing L1 is 1 / 2λ.

[0060] Simultaneously, along the second direction b, the preset region 30 is symmetrically arranged with the connecting part 20 as the center. The first direction a is perpendicular to the second direction b and parallel to the plate. This arrangement ensures that the microwaves output from the preset region 30 are uniform and symmetrical, which helps improve the heating effect of the microwave cooking appliance. In this embodiment, the preset region 30 includes at least one feed port 40. By providing one or more feed ports 40, the antenna body 10 can adjust the range of microwave directional heating by increasing the number of feed ports 40, which helps improve the radiation effect of the preset region 30. Furthermore, it facilitates subsequent optimization design, allowing the antenna body 10 to be adjusted according to the actual size of the microwave oven.

[0061] As shown in Figures 1-4, in this embodiment, the antenna body 10 has a first width D along the second direction b. Optionally, the two edges of the antenna body 10 along the second direction b are parallel, in which case the antenna body 10 has a roughly rectangular structure. The first width D is smaller than the wavelength inside the tube, i.e., D < λ. By making the first width D smaller than the wavelength λ inside the tube, the impedance on the left and right sides of the antenna body 10 can be effectively reduced. Since the total amount of microwaves remains unchanged, most of the microwaves will radiate from the feed port 40 into the heating chamber, which helps to increase the directional heating effect of the antenna body 10. In addition, by limiting the length of the antenna body 10 in the second direction b, it helps to reduce the actual size of the antenna body 10 and reduce manufacturing costs.

[0062] It is important to further understand that the antenna body 10 has two arc-shaped edges along the first direction a, with the arc-shaped structures protruding in a direction away from the rotation axis. By making the edges of the antenna body 10 arc-shaped, the radiation effect of microwaves in the first direction a is improved. Furthermore, in conjunction with the operation of the rotary motor, a circular heating area can be formed below the heating chamber, thereby increasing the heating range of the antenna body 10, ensuring heating effect, and effectively coordinating with the placement of food.

[0063] Furthermore, the number of feed ports 40 is set to one, and the feed port 40 is a rectangular structure;

[0064] Along the second direction b, the feed port 40 has a first length, which is less than or equal to the microwave wavelength and greater than or equal to 1 / 4 of the microwave wavelength. Along the first direction, the feed port 40 has a second length, which is in the range of 8 mm to 15 mm.

[0065] Specifically, since the preset region 30 is located at the point of maximum microwave field strength, by setting the feed port 40 to be rectangular and defining the relationship between the length h of the feed port 40 and the wavelength λ inside the tube, the length h of the feed port 40 can completely cover the area with high microwave field strength, thereby increasing the impedance at this point and allowing the microwaves to radiate into the heating chamber with a greater amplitude. Simultaneously, since the microwaves emitted by the magnetron have frequency fluctuations, by keeping the width d of the feed port 40 within the range of 8mm to 15mm, stable microwave radiation from the feed port 40 can be effectively ensured.

[0066] It is important to understand that, as shown in Figure 2, the preset region 30 and the connecting part 20 are sequentially arranged along the first direction a. The preset region 30 includes a feed port 40, which is a rectangular structure. The length direction of the feed port 40 is perpendicular to the first direction a, i.e., the second direction b, and the width direction of the feed port 40 is the first direction a. The length h of the feed port 40 is less than or equal to the wavelength inside the tube, and greater than or equal to 1 / 4 of the wavelength inside the tube, i.e., 1 / 4λ≤h≤λ, to completely cover areas with high microwave field strength, thereby allowing microwaves to pass through the feed port 40 with a greater amplitude. Optionally, 1 / 4λ≤h<1 / 2λ. Simultaneously, the width d of the feed port 40 is in the range of 8mm to 15mm. In this case, the value of the width d of the feed port 40 is between 1 / 12λ and 1 / 8λ, which provides good adaptability to microwave bandwidth and ensures stable microwave radiation.

[0067] It should be noted that, as shown in Figure 1, since the antenna body 10 has no other feed ports 40 except for the preset area 30, the impedance at these locations is very small, i.e., low impedance locations, and effective current cutting cannot be formed. The amount of microwaves radiated from these locations is also very small. Therefore, microwaves will mainly radiate from the locations with feed ports 40. At this time, the preset area 30 is a high impedance location.

[0068] Furthermore, the number of feed ports 40 is set to two, and the two feed ports 40 are spaced apart along the second direction b.

[0069] Specifically, by setting two feed ports 40, the characteristics of the preset region 30 can be increased, thereby enabling the preset region 30 to form more current contact and radiate more microwave energy. At the same time, the two feed ports 40 are spaced apart along the second direction b, which helps to improve the heating range of the preset region 30 and the directivity of local heating, thereby effectively improving the performance of the antenna body 10.

[0070] It is important to understand that, as shown in Figures 1-4, the direction of the connecting part 20 towards the feed port 40 is the first direction a shown in the figures. The second direction b is perpendicular to the first direction a and also perpendicular to the axis of the through hole. Along the second direction b, the two feed ports 40 are spaced apart and symmetrically arranged with the through hole as the center. This arrangement helps to ensure that the microwaves output from the feed ports 40 are uniform and symmetrical, thereby helping to ensure the heating effect of the food.

[0071] Furthermore, the feed port 40 includes two slits 41, which are arranged intersectingly, or the feed port 40 includes two slits 41, which are arranged in parallel.

[0072] Specifically, by setting the feed port 40 as two slits 41, the width of the two slits 41 can be adaptively increased, thereby ensuring the radiation efficiency of the feed port 40. Setting the two slits 41 as parallel or intersecting can effectively cut and cover the surface current, thereby ensuring the radiation effect of the preset area 30.

[0073] It is important to understand that, as shown in Figures 1 and 3, the two slits 41 are intersecting to effectively improve the cutting effect on the surface current. Furthermore, by adjusting the width of the two slits 41, the radiation efficiency of the feed port 40 can be effectively guaranteed. Optionally, the two slits 41 are perpendicularly intersecting, which allows the feed port 40 to form a 90° phase difference with the surface current, resulting in better radiation efficiency.

[0074] As shown in Figure 4, the two slits 41 can be arranged in a parallel state. In this case, the two slits 41 can still cut the surface current. The two slits 41 can be arranged parallel or at an angle, both of which help to further improve the cutting effect of the slits 41 on the current. Moreover, the width of both slits 41 can be adaptively increased. In this embodiment, the two slits 41 are each set as an arc structure, and the two arcs are arranged in parallel. In this case, the feed port 40 cuts the surface current at multiple angles, which helps to ensure the radiation efficiency of the feed port 40.

[0075] It should be noted that the feed port 40 may also include multiple slits 41, the number of which can be three, four, five, etc. Three or more slits 41 can be arranged intersectingly and converging at a single point, or they can be connected to adjacent slits 41. Meanwhile, to ensure the cutting effect of the feed port 40, the width of the slits 41 will decrease as the number of slits 41 increases. To ensure the radiation effect of the feed port 40, the width of the slits 41 can be at least 8mm, and the specific width dimension will not be limited here.

[0076] Furthermore, a first compensation port 50 is provided on the antenna body 10. Along the first direction a, the first compensation port 50 and the preset area 30 are respectively provided on opposite sides of the rotation axis, and along the second direction b, the first compensation port 50 is symmetrically arranged with the rotation axis as the center.

[0077] Specifically, by setting the first compensation port 50, some microwaves will be radiated from the first compensation port 50. At this time, it helps to enhance the microwave field strength in the central area of ​​the antenna body 10, thereby helping to ensure the overall uniformity of the antenna body 10.

[0078] It is important to understand that, as shown in Figure 4, along the first direction a, the antenna body 10 is sequentially provided with a preset area 30, a connecting portion 20, and a first compensation port 50. The first compensation port 50 is closer to the connecting portion 20 (rotation axis) than the preset area 30. By placing the first compensation port 50 on the side of the connecting portion 20 (rotation axis) away from the preset area 30, the radiation on that side can be effectively increased, thus better heating the other food. This improves the heating speed of the food while ensuring both dishes are heated evenly (due to differences in ingredients or initial temperatures). Simultaneously, the opening area of ​​the first compensation port 50 is smaller than the total opening area of ​​the preset area 30. Adjusting the distance and opening area helps to further increase the weight of each side of the antenna body 10, ensuring that the antenna body 10 does not easily sway during rotation. Moreover, by setting the first compensation port 50, the field strength in the central area can be compensated, thereby achieving better overall uniformity.

[0079] Furthermore, along the first direction a, there is a second distance L2 between the first compensation port 50 and the rotation axis, and the second distance L2 is smaller than the first distance L1.

[0080] Specifically, by limiting the distance between the first compensation port 50 and the connecting part 20, and by making the shape of the first compensation port 50 symmetrical, it helps to ensure the stability of the antenna body 10 when rotating, and also ensures that the food at this position can be heated evenly, which helps to improve the performance of the antenna body 10.

[0081] It is important to understand that, as shown in Figure 1, the first compensation port 50 is rectangular, and at this time, along the first direction a, there is a second distance L2 between the first compensation port 50 and the connecting part 20 (rotation axis), where L2 < L1. The length direction of the first compensation port 50 is perpendicular to the first direction a, that is, the length direction of the first compensation port 50 is the second direction b, and the width direction of the first compensation port 50 is the first direction a. The length of the first compensation port 50 is greater than the length of the preset area 30 in the second direction b, thereby allowing microwaves to pass through the first compensation port 50 more effectively, improving the radiation effect of the first compensation port 50. Simultaneously, the width of the feed port 40 is greater than 8mm, and the area of ​​the first compensation port 50 is smaller than the area of ​​the preset area 30. This configuration helps ensure the stability of the overall structure of the antenna body 10 during rotation and also improves heating efficiency when two plates are heated simultaneously (different ingredients or significant differences in initial temperature).

[0082] Furthermore, the antenna body 10 also has a second compensation port 60, which is disposed between the preset area 30 and the rotation axis, and the opening area of ​​the second compensation port 60 is smaller than the opening area of ​​the first compensation port 50.

[0083] Specifically, by setting the second compensation port 60, in conjunction with the first compensation port 50, the microwave field strength in the central region of the antenna body 10 can be further enhanced, achieving better overall uniformity. Simultaneously, the second compensation port 60 can also cooperate with the preset area 30, thereby further ensuring the directional heating capability of the antenna body 10 and helping to further improve the performance of microwave cooking appliances.

[0084] It should be understood that, as shown in Figure 4, along the first direction a, the antenna body 10 is sequentially provided with a preset area 30, a first compensation port 50, a connecting part 20, and a second compensation port 50. In this embodiment, the opening area of ​​the second compensation port 60 is smaller than that of the first compensation port 50. When some microwaves pass through the second compensation port 60, the radiation intensity on the side where the preset area 30 is located on the antenna body 10 can be effectively increased, which can effectively ensure the directional heating capability of the antenna body 10. At the same time, the setting of the second compensation port 60 allows the opening area of ​​the first compensation port 50 to be adaptively increased, thereby helping to further enhance the microwave field strength in the central region of the antenna body 10. Moreover, when microwaves pass through the second compensation port 60, some of the heat will also move towards the central region, which also helps to enhance the microwave field strength in the central region of the antenna body 10 and increase the heating range of the food.

[0085] Furthermore, the second compensation port 60 has a third distance L3 between it and the rotation axis, and the third distance L3 is greater than or equal to the second distance L2.

[0086] Specifically, by defining the position of the second compensation port, the matching relationship between the second compensation port 60 and the first compensation port 50 can be effectively determined, thereby helping to provide a theoretical basis for subsequent optimization and redesign.

[0087] It is important to understand that, as shown in Figure 4, both the second compensation port 60 and the first compensation port 50 are rectangular. The length direction of the second compensation port 60 is the second direction b, and the width direction of the first compensation port 50 is the first direction a. The second compensation port 60 has a first distance L3 between it and the connecting portion 20. Where L3 ≥ L2, meaning the second compensation port 60 is farther from the connecting portion 20 than the first compensation port 50. Simultaneously, the second compensation port 60 is located between the connecting portion 20 and the preset region 30, meaning the distance between the second compensation port 60 and the connecting portion 20 is less than half the wavelength within the tube. Therefore, the second compensation port 60 can both compensate for the field strength in the central region and improve the directional heating capability of the antenna body 10.

[0088] As shown in Figure 5, a simulation test was conducted on the antenna body 10 with the first compensation port 50 and the second compensation port 60 in Figure 1. At this time, the preset area 30 of the antenna body 10 was located on the left side of the antenna body 10 and was in a static state. Specifically, a water load test was performed in a 16-grid format (the initial water temperature was room temperature), and temperature was measured after heating for 3 minutes. By comparison, it can be seen that the color on the left side is lighter than the color on the right side. The color on the right side corresponds to the lower module of the temperature gauge, and the color on the left side corresponds to the upper module of the temperature gauge. Therefore, it can be concluded that the antenna body 10 of this invention has directional heating capability.

[0089] In the actual test, two cups of milk with different initial temperatures, with an initial temperature difference of 19.9℃, were heated for 3 minutes before testing. The test data are as follows:

[0090]

[0091] As shown in the table above, after the three-minute heating time, both the milk on the left and right sides have a high temperature, and the temperature difference between them changes from 19.9℃ to 1.4℃ (and the milk with a lower initial temperature has a higher temperature after cooking), so they can be taken out of the oven at the same temperature.

[0092] In summary, the microwave cooking appliance of this utility model, based on a metal antenna body 10, incorporates high-impedance and low-impedance sections. This is achieved by setting gaps of different shapes and positions on the antenna body, allowing the antenna body to exhibit significantly different impedance values ​​in various directions. This, in turn, cuts the current in each direction to varying degrees, enabling microwaves to radiate in a larger proportion from a single direction or other desired directions. Ultimately, this achieves the condition of heating two dishes simultaneously (even if the ingredients or initial temperatures differ significantly).

[0093] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A microwave cooking appliance, characterized in that, The microwave cooking appliance includes: a body having a cooking cavity, the cooking cavity including a microwave feed position; a microwave generator disposed within the body and outside the cooking cavity; and an antenna assembly including an antenna body disposed at the microwave feed position, the antenna body being rotatable and used to guide microwaves generated by the microwave generator into the cooking cavity; wherein the antenna body is a plate-like structure with a preset area, the preset area having at least one feed port, such that the impedance of the antenna body outside the preset area is less than the impedance of the preset area; along a first direction, the distance between the geometric center of the preset area and the rotation axis of the antenna body is a first spacing, the first spacing being greater than or equal to 1 / 3 and less than or equal to 2 / 3 of the wavelength of the microwave; the first direction being the alignment direction of the preset area and the rotation axis of the antenna body; along a second direction, the antenna body has a first width, the first width being less than the wavelength of the microwave; the second direction is perpendicular to the first direction; along the second direction, the preset area is symmetrically arranged about the rotation axis.

2. The microwave cooking appliance according to claim 1, characterized in that, The number of feed ports is set to one, and the feed port is a rectangular structure; along the second direction, the feed port has a first length, the first length being less than or equal to the wavelength of the microwave and greater than or equal to 1 / 4 of the wavelength of the microwave; along the first direction, the feed port has a second length, the second length being in the range of 8mm to 15mm.

3. The microwave cooking appliance according to claim 1, characterized in that, The number of feed ports is set to two, and the two feed ports are spaced apart along the second direction.

4. The microwave cooking appliance according to claim 3, characterized in that, The feed port includes two slits, and the two slits are arranged intersectingly; or, the feed port includes two slits, and the two slits are arranged parallel to each other.

5. The microwave cooking appliance according to claim 1, characterized in that, The antenna body is configured with arc-shaped structures on its two edges along the first direction, and the arc-shaped structures protrude in a direction away from the rotation axis.

6. The microwave cooking appliance according to claim 1, characterized in that, The antenna body is provided with a first compensation port. Along the first direction, the first compensation port and the preset area are respectively arranged on opposite sides of the rotation axis; and along the second direction, the first compensation port is symmetrically arranged with the rotation axis as the center.

7. The microwave cooking appliance according to claim 6, characterized in that, Along the first direction, there is a second distance between the first compensation port and the rotation axis, and the second distance is smaller than the first distance.

8. The microwave cooking appliance according to claim 7, characterized in that, The antenna body also has a second compensation port, which is disposed between the preset area and the rotation axis, and the opening area of ​​the second compensation port is smaller than the opening area of ​​the first compensation port.

9. The microwave cooking appliance according to claim 8, characterized in that, Along the first direction, there is a third distance between the second compensation port and the rotation axis, the third distance being greater than or equal to the second distance.

10. The microwave cooking appliance according to any one of claims 1 to 9, characterized in that, Along the first direction, the rotation axis is equidistant from the two edges of the antenna body; and / or, the microwave generating device includes a magnetron and a waveguide, one end of the waveguide is connected to the magnetron, the other end of the waveguide is connected to the outer wall of the cooking cavity and is positioned opposite to the microwave feed position, the antenna body is provided with a sleeve portion, the sleeve portion extends into the waveguide and is coaxially arranged with the rotation axis, the sleeve portion is used to guide the microwaves in the waveguide to the antenna body, the antenna assembly also includes a driving member, the driving member is disposed outside the waveguide and located outside the cooking cavity, the driving shaft of the driving member passes through the waveguide and is inserted and fixed to the sleeve portion.

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