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 outside a cooking cavity of the machine body and is used for guiding microwaves generated by the microwave generating device into the cooking cavity. The antenna body is of a circular plate-shaped structure, the antenna body is provided with a preset area, at least one feed port is formed in the preset area, so that the impedance, located outside the preset area, of the antenna body is smaller than that of the preset area, and 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 in the first direction; the first direction is the arrangement direction of the rotation axis of the preset area and the antenna body. According to the microwave cooking utensil, the preset area is arranged on one side of the antenna body, so that microwaves can be mainly radiated from the preset area, and directional heating of food is 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 using existing microwave cookers to cook two types of food. This objective 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 outside the cooking cavity and located at the microwave feed position, the antenna body being rotatable outside the cooking cavity and used to guide microwaves generated by a microwave generator into the cooking cavity;

[0009] The antenna body is a circular plate structure with a preset area. At least one feed port is provided in 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 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.

[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, causing the antenna body to exhibit significantly different impedance values ​​in different directions. By cutting the current in each direction to varying degrees, the microwaves entering the antenna body mainly radiate from the feed port of the preset area, thus facilitating directional heating of food. Simultaneously, by setting the antenna body as a circular plate structure, it can effectively ensure that other microwave energy can pass evenly through the antenna body and be projected onto other parts of the food or other foods. In this way, the microwaves passing through the antenna body can achieve both uniform heating and directional heating of the food, helping to solve the problem of large temperature differences at the end of cooking when cooking two types of food in existing microwave cooking appliances.

[0011] Furthermore, by designing the antenna body as a circular plate structure, it is less prone to wobbling during rotation. Moreover, by defining the position of the preset area, the orientation of the preset 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 optimal performance of the microwave cooking appliance.

[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 feed port is set to one, and the feed port has a rectangular structure. The length direction of the feed port is perpendicular to the first direction. The length of the feed port 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. The width of the feed port is in the range of 8mm to 15mm.

[0014] In some embodiments of this utility model, the feed port is set to one, the feed port includes multiple gaps, and the multiple gaps are arranged in an intersecting manner.

[0015] In some embodiments of this utility model, the number of feed ports is set to two, each feed port includes two slits, each slit is a bent structure, and the two slits are intersecting each other.

[0016] In some embodiments of this utility model, the number of feed ports is set to two, each feed port includes two slits, each slit is a straight structure, and the two slits intersect perpendicularly.

[0017] In some embodiments of this utility model, a first compensation port is provided on the antenna, and along the first direction, the first compensation port and the preset area are respectively located on opposite sides of the rotation axis.

[0018] In some embodiments of this utility model, along the first direction, the distance between the first compensation port and the rotation axis is less than 1 / 2 of the radius of the antenna body;

[0019] Furthermore, along the second direction, the first compensation port is symmetrically arranged with the rotation axis as the center, and the second direction is perpendicular to the first direction.

[0020] In some embodiments of this utility model, the antenna 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.

[0021] In some embodiments of this utility model, the distance between the second compensation port and the rotation axis is greater than 1 / 2 of the radius of the antenna body and less than 1 / 2 of the wavelength of the microwave.

[0022] In some embodiments of this utility model, the microwave generating device includes a magnetron and a waveguide, one end of the waveguide is connected to the magnetron, and the other end of the waveguide is connected to the outer wall of the cooking cavity and is disposed opposite to the microwave feed position;

[0023] The antenna body is provided with a sleeve portion, which extends into the waveguide and is coaxially arranged with the rotation axis. The sleeve portion is used to guide microwaves in the waveguide to the antenna body. The antenna assembly also includes a driving member, which 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

[0024] 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:

[0025] Figure 1 is a schematic diagram of one structure of the antenna body according to an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of another structure of the antenna body shown in this embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of the third structure of the antenna body shown in the embodiment of this utility model;

[0028] Figure 4 is a schematic diagram of the fourth structure of the antenna body shown in the embodiment of this utility model;

[0029] Figure 5 is a simulation diagram of the antenna body shown in Figure 4 operating in a microwave cooking appliance in a static state.

[0030] The markings in the attached diagram are as follows:

[0031] 10. Antenna body;

[0032] 20. Connecting part;

[0033] 30. Preset area;

[0034] 40. Feed opening; 41. Gap;

[0035] 50. First compensation port;

[0036] 60. Second compensation port;

[0037] L, first spacing; L1, second spacing; L2, third spacing;

[0038] h, length; d, width. Detailed Implementation

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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).

[0046] 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.

[0047] 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.

[0048] 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.

[0049] The microwave generator is located inside the machine body and outside the cooking cavity. In this configuration, the microwave generator produces microwaves and transmits them to the antenna assembly. Simultaneously, the antenna assembly includes an antenna body located outside the cooking cavity at the microwave feed position. The antenna body can rotate outside the cooking cavity and is used to guide the microwaves generated by the microwave generator into the cooking cavity.

[0050] At this time, the antenna body 10 is a circular plate structure. The antenna body 10 is provided with a preset region 30. At least one feed port 40 is opened in the preset region 30 so 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 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 a is the arrangement direction of the preset region 30 and the rotation axis of the antenna body 10.

[0051] Specifically, by setting a preset region 30 on one side of the antenna body 10, different impedance sections can be formed, allowing the metal antenna body 10 to exhibit significantly different impedance values ​​in different directions. By cutting the current in each direction to different degrees, the microwaves output from the waveguide enter the antenna body 10 and are mainly radiated from the feed port 40 of the preset region 30, which helps to achieve directional heating of food. At the same time, setting the antenna body 10 as a circular plate structure can effectively ensure that other microwave energy can pass through the antenna body 10 evenly and be projected onto other parts of the food or other foods. In this way, the microwaves through the antenna body 10 can both heat the food evenly and achieve directional heating of the food, which helps to solve the problem of large temperature differences at the end of cooking when cooking two types of food in existing microwave cookers.

[0052] Furthermore, by setting the antenna body 10 as a circular plate structure, it is less prone to wobbling when rotating. Moreover, by defining the position of the preset area 30, the orientation of the preset area 30 can be better controlled in conjunction with the rotation of the antenna body 10. This allows microwaves to be better directed onto foods with lower temperatures or slower heating rates, thereby increasing the heating speed of the food while achieving simultaneous heating and ensuring the effectiveness of the microwave cooking appliance.

[0053] 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.

[0054] 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.

[0055] The antenna body 10 is a metal part and is designed as a circular plate structure. A connecting part 20 is provided at the center of the antenna body 10. The connecting part 20 is used to connect with the drive shaft of the rotary motor, so that the rotation axis of the antenna body 10 and the rotation axis of the drive shaft are on the same straight line. At this time, the antenna body 10 can rotate around the drive shaft. Since the antenna body 10 is designed as a circular plate structure with uniform thickness, the weight of each side of the antenna body 10 is relatively consistent. When the antenna body 10 rotates, it is not easy to shake. Moreover, the amount of microwaves passing through all parts of the antenna body 10 is the same or similar, making it easier to achieve the overall uniformity of food heating.

[0056] It is understandable that the connecting part 20 is configured as a mounting hole. In this case, the antenna body 10 can be connected to the drive shaft through a fastener passing through the mounting hole, ensuring that the rotation axis of the mounting hole and the rotation axis of the antenna body 10 are aligned. Optionally, the fastener is screwed to the drive shaft, and the fastener can be a screw, bolt, or stud. Configuring the connecting part 20 as a mounting hole effectively reduces the manufacturing difficulty of the antenna body 10 and improves its manufacturing efficiency. Furthermore, it effectively reduces the impact of the connecting part 20 on microwave transmission, ensuring the effectiveness of the microwave cooking appliance.

[0057] As shown in Figures 1-4, a preset region 30 is also provided on the antenna body 10 along the first direction a. This preset region 30 is located on one side of the antenna body 10, and its geometric center is spaced apart from the rotation axis of the antenna body 10 by a first gap L. The value of the first gap L is within the range of 1 / 3 to 2 / 3 of the microwave wavelength λ. Since the microwave field strength is relatively large and the microwave transmission efficiency is relatively high when the distance from the rotation axis of the antenna body 10 is between 1 / 3λ and 2 / 3λ, limiting the value of the first gap L to between 1 / 3λ and 2 / 3λ effectively ensures the microwave flow in the preset region 30, thereby further improving the heating effect of the preset region 30. Optionally, the first gap L is 1 / 2λ.

[0058] It should be noted that the value of the first spacing L is calculated based on the actual wavelength λ generated by the microwave oven, which can improve the directional heating effect of the antenna body 10. At this time, the design of the antenna body 10 is related to the type and model of the microwave generator.

[0059] Furthermore, as shown in Figures 1-4, the orientation of the rotation axis of the preset region 30 and the antenna body 10 is the first direction a shown in the figures, and the second direction b is perpendicular to the first direction a and also perpendicular to the rotation axis of the antenna body 10. Along the second direction b, the preset region 30 is symmetrically arranged with the rotation axis of the antenna body 10 as the center. This arrangement helps to ensure that the microwaves output by the preset region 30 are uniform and symmetrical, thereby helping to ensure the heating effect of the food.

[0060] Furthermore, the feed port 40 is set as one, and the feed port 40 has a rectangular structure. The length direction of the feed port is perpendicular to 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. The width d of the feed port 40 is in the range of 8mm to 15mm. The length direction of the feed port 40 is perpendicular to the first direction a.

[0061] Specifically, since the preset area 30 is located at the point of maximum microwave field strength, by setting the feed port 40 to be rectangular and limiting 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 location of high microwave field strength, thereby increasing the impedance at this location and allowing the microwave to radiate into the heating chamber more significantly. At the same time, since the microwave emitted by the magnetron has frequency fluctuations, by keeping the width d of the feed port 40 within the range of 8mm to 15mm, the stable microwave radiation from the feed port 40 can be effectively ensured.

[0062] It is important to understand that, as shown in Figure 1, 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 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.

[0063] 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, 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 the high impedance part.

[0064] Furthermore, the feed port 40 is configured as one, and the feed port 40 includes multiple slots 41, which are arranged in an intersecting manner.

[0065] Specifically, by setting the feed port 40 to have multiple gaps 41, the preset area 30 can cut the current more, thereby radiating more microwave energy and helping to further improve the microwave transmission efficiency.

[0066] It is important to understand that, as shown in Figure 2, the feed port 40 is configured as a single port, which includes multiple slots 41 that are intersected and converge at a single point. In this embodiment, the feed port 40 includes three slots 41 that are intersected and converge at a single point. These three slots 41 each include two oblique slots and one narrow longitudinal slot. Using three slots 41 helps to improve the current cutting effect and allows more microwave energy to be radiated.

[0067] It should be noted that the number of slits 41 in the feed port 40 can be set to one, two, four, five, etc., in addition to three. Furthermore, 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. Therefore, the width of the slits 41 can be adjusted according to the actual number of slits 41. The goal is simply to achieve the cutting of the current; no further limitations will be specified here.

[0068] Furthermore, the number of feed openings 40 is set to two, each feed opening 40 includes two slots 41, each slot 41 is a bent structure, and the two slots 41 are intersecting each other.

[0069] Specifically, by setting two feed ports 40, the characteristics of the preset region 30 can be enhanced, thereby enabling the preset region 30 to form a greater connection with the current and radiate more microwave energy. By setting two feed ports 40 and intersecting the gaps 41 of the two ports, the shape of the feed ports 40 is enriched, thereby further enhancing the characteristics of the preset region 30 and improving the microwave radiation effect.

[0070] It is important to understand that, as shown in Figure 3, the antenna body 10 has two feed ports 40, which are symmetrically arranged along the second direction b, with the connecting part 20 as the center. The arrangement of the two feed ports 40 effectively increases the microwave radiation range, thereby helping to quickly raise the temperature of food. Simultaneously, each feed port 40 is configured with two slots 41, each slot 41 is bent into a Z-shaped structure, and the two slots 41 intersect to form a swastika structure. This arrangement enriches the shape of the feed ports 40 and ensures that the feed ports 40 can cut off the current.

[0071] Furthermore, the two slots 41 can also be configured as a straight line structure, intersecting or parallel. As shown in Figure 4, there are two feed ports 40, and each feed port 40 has two slots 41. The two slots 41 are intersecting. Setting the feed port 40 with the two intersecting slots 41 improves the cutting effect on the surface current. In this case, the width of the two slots 41 can be adaptively increased to ensure the radiation efficiency of the feed port 40. Optionally, the two slots 41 are perpendicularly intersecting. Making the two slots 41 perpendicularly intersecting allows the feed port 40 to form a 90° phase difference with the surface current, resulting in better radiation efficiency of the feed port 40.

[0072] It should be noted that when there are two feed ports 40, the feed ports 40 may include one or more of the following: horizontal slits, vertical slits and diagonal slits. They can be recombined by different numbers and shapes to ensure that the current can be cut. No further restrictions are imposed here.

[0073] Furthermore, the width of the aforementioned slit 41 is greater than or equal to 1 / 12 of the wavelength. Optionally, the width of the slit 41 is greater than or equal to 8 mm. In this case, in addition to maintaining the cutting of the current, the slit 41 can also radiate microwaves to a greater extent.

[0074] Furthermore, the distance between the two feed ports 40 is in the range of 1 / 9 to 1 / 3 of the microwave wavelength.

[0075] Specifically, by limiting the distance between the two feed ports 40 to a range of 1 / 9 to 1 / 3 of the microwave wavelength, on the one hand, it can match the length and width of the gap 41 to increase the area of ​​the preset region 30, thereby improving the heating range of the preset region 30 and the directivity of local heating; on the other hand, it can effectively ensure uniform heating of each part of the preset region 30, thereby improving the performance of the antenna body 10.

[0076] It should be understood that, as shown in Figure 4, in this embodiment, along the second direction b, the distance between the two feed ports 40 is within the range of 1 / 9λ to 1 / 3λ. Optionally, the distance between the two feed ports 40 is 1 / 8 to 1 / 3 of the radius of the antenna body 10, in which case the distance between the two feed ports 40 is greater than 1 / 8λ. This setting helps to further improve the directivity of local heating.

[0077] Furthermore, a first compensation port 50 is provided on the antenna body 10, and along the first direction, the first compensation port 50 and the preset area 30 are respectively located on opposite sides of the rotation axis.

[0078] 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.

[0079] 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, with the first compensation port 50 being closer to the connecting portion 20 than the preset area 30. By placing the first compensation port 50 on the side of the connecting portion 20 away from the preset area 30, the radiation on that side can be effectively increased, thereby better heating another food. This improves the heating speed of the food while ensuring that both dishes are heated simultaneously (due to differences in ingredients or initial temperatures). Optionally, the opening area of ​​the first compensation port 50 is smaller than the total opening area of ​​the preset area 30. By adjusting the distance between the first compensation port 50 and the rotation axis, as well as the opening area of ​​the first compensation port 50, the weight of each side of the antenna body 10 can be further improved, 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.

[0080] Furthermore, along the first direction a, the distance between the first compensation port 50 and the rotation axis is less than 1 / 2 of the radius of the antenna body 10, and along the second direction b, the first compensation port 50 is symmetrically arranged with the rotation axis as the center, and the second direction b is perpendicular to the first direction a.

[0081] Specifically, by limiting the distance between the first compensation port 50 and the rotation axis, 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.

[0082] It is important to understand that, as shown in Figure 4, 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, which is less than half the radius of the antenna body 10. 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).

[0083] 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.

[0084] 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.

[0085] 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.

[0086] Furthermore, the distance between the second compensation port 60 and the rotation axis is greater than 1 / 2 of the radius of the antenna body 10 and less than 1 / 2 of the wavelength of the microwave.

[0087] Specifically, by defining the position of the second compensation port 60, 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.

[0088] 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. In this case, 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 and the connecting portion 20 have a first distance L1. Where L1 > 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.

[0089] As shown in Figure 5, the antenna body 10 with a first compensation port 50 and a second compensation port 60 is undergoing simulation testing. At this time, the preset area 30 of the antenna body 10 is located on the left side of the antenna body 10, and the antenna body 10 is in a static state, i.e., the rotating motor is not working. Optionally, a water load test is performed in a 16-grid format (the initial water temperature is room temperature), and temperature is measured after heating for 3 minutes. By comparison, it can be seen that the color on the left is lighter than the color on the right. The right color corresponds to the lower module of the temperature gauge, and the left color 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 without rotation.

[0090] In the actual test, two cups of milk with different initial temperatures, with an initial temperature difference of 19.7℃, were heated for 3 minutes before testing. The test data are as follows:

[0091] Temperature difference between left and right sides: T0 (start) 7.1 26.8 19.7; T1 (end) 66.6 65.0 1.6 surface

[0092] 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 has decreased from 19.7℃ to 1.6℃ (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.

[0093] In summary, the microwave cooking appliance of this utility model, based on a metal antenna body 10, incorporates high-impedance and low-impedance sections. By setting gaps of different shapes and positions on the antenna body, the antenna body exhibits significantly different impedance values ​​in various directions. This allows the current in each direction to be cut 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 are different or have significant differences in initial temperature).

[0094] 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 located outside the cooking cavity; and an antenna assembly including an antenna body disposed outside the cooking cavity and located at the microwave feed position, the antenna body being rotatable outside the cooking cavity and used to guide microwaves generated by the microwave generator into the cooking cavity; wherein the antenna body is a circular plate structure with a preset area, and 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, and along a first direction, the distance between the geometric center of the preset area and the rotation axis of the antenna body 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 being the alignment direction of the preset area and the rotation axis of the antenna body.

2. The microwave cooking appliance according to claim 1, characterized in that, The feed port is configured as one, and the feed port has a rectangular structure. The length direction of the feed port is perpendicular to the first direction. The length of the feed port 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. The width of the feed port is in the range of 8mm to 15mm.

3. The microwave cooking appliance according to claim 1, characterized in that, The feed port is configured as one, and the feed port includes multiple gaps, which are arranged in an intersecting manner.

4. The microwave cooking appliance according to claim 1, characterized in that, The number of feed ports is set to two, and each feed port includes two slits. Each slit has a bent structure, and the two slits are arranged to intersect each other.

5. The microwave cooking appliance according to claim 1, characterized in that, The number of feed ports is set to two, and each feed port includes two slits. Each slit is a straight structure, and the two slits intersect perpendicularly.

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

7. The microwave cooking appliance according to claim 6, characterized in that, Along the first direction, the distance between the first compensation port and the rotation axis is less than 1 / 2 of the radius of the antenna body; and along the second direction, the first compensation port is symmetrically arranged with the rotation axis as the center, and the second direction is perpendicular to the first direction.

8. The microwave cooking appliance according to claim 6, characterized in that, The antenna 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, The distance between the second compensation port and the rotation axis is greater than 1 / 2 of the radius of the antenna body and less than 1 / 2 of the wavelength of the microwave.

10. The microwave cooking appliance according to any one of claims 1 to 9, characterized in that, The microwave generator includes a magnetron and a waveguide. One end of the waveguide is connected to the magnetron, and 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 has a sleeve portion that extends into the waveguide and is coaxial 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 drive component that is disposed outside the waveguide and outside the cooking cavity. The drive shaft of the drive component passes through the waveguide and is inserted and fixed to the sleeve portion.

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