Microwave cooking utensil

Abstract

The utility model particularly relates to a microwave cooking utensil. Comprising 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 is of a plate-shaped structure, the antenna body is provided with a preset area, and 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 in the first direction, the distance between the geometric center of the preset area and the rotation axis is a first interval; the distance between the rotation axis and the edge of the side, deviating from the preset area, of the antenna body is a second interval which is smaller than the first interval. According to the microwave cooking utensil, most of microwaves are radiated out from the preset area after entering the antenna body, the effect of directional radiation is achieved, and therefore food can be heated in a directional mode.

Description

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. Utility Model Content

[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] The first aspect of this utility model provides a microwave cooking appliance, the microwave cooking appliance comprising:

[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 the first direction, the distance between the geometric center of the preset area and the rotation axis is a first spacing. The distance between the rotation axis and the edge of the antenna body on the side away from the preset area is a second spacing. The second spacing is less than the first spacing.

[0010] The microwave cooking appliance of this invention, by setting a preset area on the antenna body, can form impedance sections of varying heights, resulting in significantly different impedance values ​​in different directions of the antenna body. By cutting the current in each direction to different 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 a second spacing smaller than the first spacing, the side of the rotation axis away from the preset area has lower impedance, further increasing the amount of microwave radiation output from the feed port, thereby enhancing the directional radiation effect of the antenna body. This design 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 the second spacing to be smaller than the first spacing, the antenna body is designed with a center-offset structure. In this configuration, the feed port helps improve the antenna body's balance, making it less prone to swaying during rotation. Simultaneously, since the preset area is located on one side of the antenna body, its orientation can be better controlled during rotation. This allows for better projection of microwaves onto foods with lower temperatures or slower heating rates, achieving simultaneous heating while increasing the food's heating speed and ensuring optimal microwave cooking performance.

[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 two, and the two feed ports are spaced apart along a second direction, which is perpendicular to the first direction.

[0014] In some embodiments of this utility model, the feed opening includes two slits, and the two slits are arranged intersectingly.

[0015] In some embodiments of this utility model, the feed opening includes two slits, and the two slits are arranged in parallel.

[0016] In some embodiments of this invention, the distance between the two microwave extraction ports is in the range of 1 / 9 to 1 / 3 of the wavelength of the microwave.

[0017] In some embodiments of this utility model, the two edges of the antenna body along the second direction are parallel, the rotation axis along the second direction has a third distance from the edge of the antenna body, the second direction is perpendicular to the first direction, and the third distance is less than 1 / 2 of the wavelength of the microwave.

[0018] In some embodiments of this utility model, the feed port is a rectangular opening, the length of the feed port along the second direction 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, and the second direction is perpendicular to the first direction.

[0019] In some embodiments of this utility model, along the first direction, the length of the feed port is less than or equal to 1 / 6 of the wavelength of the microwave and greater than or equal to 1 / 12 of the wavelength of the microwave.

[0020] In some embodiments of this utility model, the antenna body includes:

[0021] The first part is configured as a circular structure, and the axis of rotation passes through the first part;

[0022] The second part is connected to the first part, and the second part is a fan ring structure, with the feed port located on the second part.

[0023] In some embodiments of this utility model, the antenna body is provided with openings, and the number of openings is multiple, and the multiple openings are arranged around the feed port;

[0024] And / or, the microwave generating device includes a magnetron and a waveguide, one end of the waveguide being connected to the magnetron, the other end of the waveguide being connected to the outer wall of the cooking cavity and being disposed opposite to the microwave feed position, the antenna body having a sleeve portion extending into the waveguide and coaxially disposed with the rotation axis, the sleeve portion being used to guide the microwaves in the waveguide to the antenna body, the antenna assembly also including a driving member, the driving member being disposed outside the waveguide and located outside the cooking cavity, the driving shaft of the driving member passing through the waveguide and being inserted and fixed to the sleeve portion. Attached Figure Description

[0025] 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:

[0026] Figure 1 This is a schematic diagram of one possible structure of the antenna body according to an embodiment of the present utility model;

[0027] Figure 2 This is a schematic diagram of another structure of the antenna body shown in this embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the third structure of the antenna body shown in the embodiment of this utility model;

[0029] Figure 4 This is a schematic diagram of the antenna body being heated in the cooking cavity according to an embodiment of the present invention;

[0030] Figure 5 for Figure 2 The diagram shows a simulation of the antenna body operating in a microwave cooking appliance in a static state.

[0031] The markings in the attached diagram are as follows:

[0032] 100. Antenna; 200. Stage; 201. First area; 202. Second area;

[0033] 10. Antenna body; 11. First part; 12. Second part;

[0034] 20. Connecting part;

[0035] 30. Preset area;

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

[0037] 50. Opening;

[0038] L1, first spacing; L2, second spacing; L3, third spacing;

[0039] h, length; d, width. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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).

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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 L1, and the distance between the rotation axis and the edge of the antenna body 10 on the side opposite to the preset region 30 is a second spacing L2. The second spacing L2 is less than the first spacing L1. Here, the first direction a is the alignment direction of the preset region 30 and the rotation axis of the antenna body 10.

[0052] 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, by setting the second spacing L2 to be smaller than the first spacing L1, the side of the rotation axis away from the preset region 30 can have a smaller impedance, which helps to further increase the amount of microwave radiation output from the feed port 40, thereby enhancing the directional radiation effect of the antenna body 10. This setting helps to solve the problem of large temperature differences at the end of cooking when cooking two types of food in existing microwave cookers.

[0053] Furthermore, by setting the second spacing L2 to be smaller than the first spacing L1, the antenna body is designed with a center-offset structure. In this case, the placement of the feed port 40 helps improve the balance of the antenna body 10, thus preventing it from wobbling during rotation. Simultaneously, since the preset area 30 is located on one side of the antenna body 10, the orientation of the preset area 30 can be better controlled during the rotation of the antenna body 10. This allows the microwaves to be better directed 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.

[0054] 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.

[0055] 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.

[0056] The antenna body 10 is made of metal. A connecting portion 20 is located at the center of the antenna body 10. This connecting portion 20 is used to connect to the drive shaft of a rotary motor, ensuring that the rotation axis of the antenna body 10 and the rotation axis of the drive shaft are aligned. This allows the antenna body 10 to rotate around the drive shaft. Because the antenna body 10 has a center-of-gravity offset structure, the presence of a feed port effectively improves the antenna body's balance, preventing it from wobbling during rotation.

[0057] 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.

[0058] Still Figures 1-4As shown, 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 distance L. Optionally, the value of the first distance 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 distance 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 distance L is 1 / 2λ.

[0059] Simultaneously, along the first direction a, there is a second distance L2 between the connecting portion 20 and the edge of the antenna body 10 away from the preset region 30, where L1 > L2. In this embodiment, the distance from the mounting hole to the left edge is less than the distance between the mounting hole and the feed port 40, which is also less than the distance from the mounting hole to the right edge. This setting effectively reduces the impedance on the left side of the mounting hole (the side away from the feed port 40), thereby enhancing the directional radiation effect of the antenna body 10.

[0060] 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.

[0061] In addition, such as Figures 1-4 As shown, the orientation of the preset region 30 and the rotation axis of the antenna body 10 is the first direction a shown in the figure. 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.

[0062] Furthermore, the number of feed ports 40 is set to two, and the two feed ports 40 are spaced apart along the second direction, which is perpendicular to the first direction.

[0063] Specifically, by setting two feed ports 40, the characteristics of the preset area 30 can be increased, thereby enabling the feed ports 40 to form more current contact and radiate more microwave energy. At the same time, the spacing along the second direction helps to improve the heating range of the microwave absorption area and the directivity of local heating, thereby effectively improving the performance of the antenna body 10.

[0064] It is necessary to understand that, such as Figures 1-3As shown, the orientation of the rotation axis of the preset region 30 and the antenna body 10 is the first direction a shown in the figure. 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, two feed ports 40 are spaced apart and symmetrically arranged with the connecting part 20 as the center. This arrangement helps to ensure that the microwaves output by the feed ports 40 are uniform and symmetrical, thereby helping to ensure the heating effect of food.

[0065] Furthermore, the feed port 40 includes two slits 41, and the two slits 41 are arranged intersectingly.

[0066] Specifically, by setting the feed port 40 to a structure with two intersecting gaps 41, it helps to further improve the cutting effect of the feed port 40 on the surface current and ensure the radiation efficiency of the feed port 40.

[0067] It is necessary to understand that, such as Figure 2 As shown, two feed ports 40 are provided, symmetrically arranged around the connecting portion 20 along the second direction b. Each feed port 40 has two slits 41, which are intersecting. By setting the two slits 41 in an intersecting state, the cutting effect on the surface current can be effectively improved. Furthermore, the width of the two slits 41 can be adaptively increased to ensure the radiation efficiency of the feed port 40. 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.

[0068] It needs to be further understood that, in addition to setting the two slits 41 to an intersecting state, they can also be set to a parallel state. In this case, the two slits 41 can still cut the surface current. Optionally, as... Figure 3 As shown, the two slits 41 are set at an angle. This helps to further improve the cutting effect of the slits 41 on the current. Moreover, the width of both slits 41 can be adaptively increased, such as... Figure 2 As shown, the two slits 41 are perpendicularly intersecting, which allows the feed port 40 to form a 90° phase difference with the surface current. Furthermore, by increasing the width of the slits 41, the radiation efficiency of the feed port 40 can be further improved.

[0069] It should be noted that, in addition to being configured as two slots 41, the feed port 40 can also be configured as one, three, four, or other numbers. When the number of feed ports 40 is three or more, optionally, at least two adjacent slots 41 should be intersecting. For example, configuring the feed port 40 as a swastika or rice-shaped structure can enrich the shape of the feed port 40 and ensure that the feed port 40 can cut the current.

[0070] 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.

[0071] What needs further understanding is, such as Figures 1 to 3 As shown, 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 greater than 1 / 8λ. On the one hand, this can match the length and width of the gap 41 to increase the area of ​​the feed port 40, thereby improving the heating range of the feed port 40 and the directivity of local heating; on the other hand, it can effectively ensure uniform heating of various parts of the feed port 40, thereby improving the performance of the antenna body 10.

[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 two edges of the antenna body 10 along the second direction b are parallel, and the rotation axis along the second direction b has a third distance L3 with the edge of the antenna body 10. The second direction b is perpendicular to the first direction a, and the third distance L3 is less than 1 / 2 of the wavelength of the microwave.

[0074] Specifically, by setting the antenna body 10 to a rectangular structure and making the distance between the connecting part 20 and the edge of the antenna body 10 along the second direction less than 1 / 2 of the wavelength inside the tube, it helps to further reduce the impedance of the antenna body 10 on both sides of the second direction b, thereby helping to increase the amount of microwave radiation at the feed port 40. In addition, it also helps to reduce the actual size of the antenna body 10 and reduce the manufacturing cost.

[0075] It is necessary to understand that, such as Figure 1 and Figure 2 As shown, the antenna body 10 has a rectangular structure. The two edges of the antenna body 10 along the second direction b are parallel. Simultaneously, along the first direction a, the two side edges of the antenna body 10 are set as arc structures, with the concave surface facing the connecting portion 20. This configuration helps improve the radiation effect in the first direction a. Furthermore, along the second direction b, there is a third distance L3 between the connecting portion 20 and any edge of the antenna body 10, where L3 < 1 / 2λ. This helps further reduce the impedance of the antenna body 10 on both sides in the second direction b. Since the total amount of microwaves remains constant, most of the microwaves will radiate from the feed port 40 into the heating chamber. In addition, reducing the length of the antenna body 10 in the second direction b helps reduce the actual size of the antenna body 10 and lower manufacturing costs.

[0076] Furthermore, the feed port 40 is a rectangular opening, and the length of the feed port 40 along the second direction b 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 second direction b is perpendicular to the first direction a.

[0077] Specifically, since the feed port 40 is located at the point of maximum microwave field strength, by setting the feed port 40 as a rectangle 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 location of high microwave field strength, thereby making the impedance at the feed port 40 higher, and thus enabling the microwave to radiate into the heating chamber with a greater amplitude.

[0078] It is necessary to understand that, such as Figure 1 As shown, along the first direction a, the connecting part 20 and the feed port 40 are arranged sequentially. The feed port 40 has a rectangular structure. At this time, the length direction of the feed port 40 is perpendicular to the first direction a, which is the second direction b. 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, so as to completely cover the location 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.

[0079] Furthermore, along the first direction a, the length of the feed port 40 is less than or equal to 1 / 6 of the microwave wavelength and greater than or equal to 1 / 12 of the microwave wavelength.

[0080] Specifically, by making the length of the feed port 40 in the first direction a range from 1 / 12 to 1 / 6 of the wavelength, the feed port 40 can have a sufficient width to ensure stable microwave radiation, which helps to further improve the heating width of the feed port 40, thereby improving the performance of the antenna body 10.

[0081] It should be understood that the length of the feed port 40 along the first direction a is the width d of the feed port 40. In this embodiment, the width d of the feed port 40 is less than or equal to 1 / 6 of the wavelength and greater than or equal to 1 / 12 of the wavelength, that is, 1 / 12λ≤h≤1 / 6λ. Optionally, the width d of the feed port 40 is 1 / 10λ. This width is better adapted to the bandwidth of microwaves. In this case, the width d of the feed port 40 is in the range of 8mm to 15mm, which can effectively ensure that the feed port 40 can perform stable microwave radiation.

[0082] Furthermore, the antenna body 10 is provided with multiple openings 50, and the multiple openings 50 are arranged around the feed port 40.

[0083] Specifically, by providing multiple openings 50 around the feed port 40, the balance of the antenna body 10 is improved, so that the antenna body 10 can maintain good stability in both stationary and rotating states.

[0084] It is necessary to understand that, such as Figure 2 As shown, four openings 50 are provided on the antenna body 10, and along the second direction b, the four openings are symmetrically arranged in pairs with the connecting part 20 as the center. This arrangement helps to ensure the balance of the antenna body 10 in the second direction b. At the same time, since the length of the connecting part 20 from the left edge is less than the distance between the connecting part 20 and the feed port 40, the impedance on the left side of the connecting part 20 (the side away from the feed port 40) is reduced, and a center of gravity offset structure is formed. Therefore, by placing the four openings 50 around the feed port 40, the antenna body 10 can be assembled and supported, thereby forming additional support to maintain the balance of the antenna body 10 and helping to improve the performance of the antenna body 10.

[0085] It should be noted that the number, size and position of the openings 50 can be adjusted adaptively according to the actual weight of the antenna body 10 and the setting position of the connecting part 20 and the feed port 40, which will not be elaborated further here.

[0086] Furthermore, the antenna body 10 includes a first part 11 and a second part 12, wherein the first part 11 is configured as a circular structure and the axis of rotation passes through the first part 11. The second part 12 is connected to the first part 11 and has a fan-ring structure, and the feed port 40 is disposed on the second part 12.

[0087] Specifically, by setting the antenna body 10 with a first part 11 and a second part 12, the structural shape of the antenna body 10 is enriched, thus providing new inspiration for subsequent research and development. Moreover, by defining the first part 11 as circular and the second part 12 connected to the first part 11 and forming a fan-ring structure, the microwave radiation is further deflected towards the side with the feed port 40, which helps to further improve the directivity of local heating.

[0088] It is necessary to understand that, such as Figure 3As shown, the antenna body 10 includes a first part 11 and a second part 12 arranged sequentially along a first direction a. The first part 11 is a circular structure, and the second part 12 is a fan-shaped ring structure. A connecting part 20 is disposed on the first part 11, and a feed port 40 is disposed on the second part 12. In this structure, there are two feed ports 40, and each feed port 40 has two slots 41, which are inclined and parallel. This arrangement allows the slots 41 to organically cooperate with the structure of the antenna body 10, ensuring effective current cutting while maximizing the radiation efficiency of the feed port 40.

[0089] by Figure 2 Taking the antenna body as an example for simulation testing, the feed port 40 is located on the right side of the antenna body 10, and the antenna body 10 is in a stationary state, that is, the rotary motor is not working. Figure 5 As shown, a water load test was conducted using a 16-grid layout (initial water temperature was room temperature). Temperature was measured after heating for 3 minutes. The comparison shows that the color on the right is lighter than the color on the left. The left color corresponds to the lower module of the temperature gauge, and the right color corresponds to the upper module. This indicates 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 -14.1℃, were heated for 3 minutes before testing. The test data are as follows:

[0091] Left side right side Temperature difference T0 (Start) 10.8 24.9 -14.1 T1 (End) 73.0 55.8 +17.2

[0092] As shown in the table above, after the three-minute heating time, both the milk on the left and right sides had a high temperature, with the temperature difference changing from -14.1℃ to +17.2℃ (and the milk with the lower initial temperature had a higher temperature after cooking), thus achieving the same temperature upon removal from the oven. In other words, if... Figure 4 As shown, when the antenna body 10 is located below the stage 200 of the heating chamber and is in a static state, the microwave generator works to generate microwaves. After being radiated by the antenna body 10, the microwaves will form a first region 201 with a faster temperature rise and a second region 202 with a slower temperature rise on the stage 200, thereby achieving simultaneous heating of two plates (different ingredients or with large differences in initial 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: The body is provided with a cooking cavity, the cooking cavity including a microwave feed position; A microwave generator is disposed inside the machine body and located outside the cooking cavity; 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; The antenna body is a plate-shaped 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 of the antenna body is a first spacing. The distance between the rotation axis and the edge of the antenna body on the side away from the preset area is a second spacing. The second spacing is less than the first spacing.

2. The microwave cooking appliance of claim 1, wherein, The number of feed ports is set to two, and the two feed ports are spaced apart along a second direction, which is perpendicular to the first direction.

3. The microwave cooking appliance according to claim 2, characterized in that The feed port includes two slits, and the two slits are arranged intersectingly.

4. The microwave cooking appliance of claim 2, wherein, The feed port includes two slits, and the two slits are arranged in parallel.

5. The microwave cooking appliance according to claim 2, characterized in that, The distance between the two feed ports is in the range of 1 / 9 to 1 / 3 of the wavelength of the microwave.

6. The microwave cooking appliance of claim 1, wherein, The antenna body has two parallel edges along the second direction. Along the second direction, the rotation axis has a third distance from the edge of the antenna body. The second direction is perpendicular to the first direction. The third distance is less than 1 / 2 of the wavelength of the microwave.

7. The microwave cooking appliance according to claim 1, characterized in that, The feed port is a rectangular opening. The length of the feed port along the second direction 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 second direction is perpendicular to the first direction.

8. The microwave cooking appliance according to claim 7, characterized in that, Along the first direction, the length of the feed port is less than or equal to 1 / 6 of the wavelength of the microwave and greater than or equal to 1 / 12 of the wavelength of the microwave.

9. The microwave cooking appliance of claim 1, wherein, The antenna body includes: The first part is configured as a circular structure, and the axis of rotation passes through the first part; The second part is connected to the first part, and the second part is a fan ring structure, with the feed port located on the second part.

10. The microwave cooking appliance according to any one of claims 1 to 9, characterized in that, The antenna body is provided with openings, and there are multiple openings, which are arranged around the feed port. And / or, the microwave generating device includes a magnetron and a waveguide, one end of the waveguide being connected to the magnetron, the other end of the waveguide being connected to the outer wall of the cooking cavity and being disposed opposite to the microwave feed position, the antenna body having a sleeve portion extending into the waveguide and coaxially disposed with the rotation axis, the sleeve portion being used to guide the microwaves in the waveguide to the antenna body, the antenna assembly also including a driving member, the driving member being disposed outside the waveguide and located outside the cooking cavity, the driving shaft of the driving member passing through the waveguide and being inserted and fixed to the sleeve portion.

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