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, and the antenna assembly comprises an antenna body capable of rotating outside a cooking cavity and guiding microwaves generated by the microwave generating device into the cooking cavity. The antenna body is of a plate-shaped structure, the antenna body is provided with a preset area, and at least one first feed port is formed in the preset area. 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 of the antenna body and the first edge of the side, away from the preset area, of the antenna body is a second interval, the second interval is smaller than the first interval, and the first interval is larger than or equal to one third of the wavelength of microwaves; 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 disclosed by the utility model, microwave can be directionally radiated from one side of the antenna body, so that directional heating of food is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of microwave heating technology, specifically relates to a microwave cooking utensil. BACKGROUND

[0002] When the microwave cooking utensil cooks food, the microwave generating device feeds microwaves into the inside of the cooking cavity, and uses the microwaves to heat and cook the food.

[0003] However, in the prior art, when two types of food (same food material but different initial temperatures, different food materials) are cooked at the same time, the temperature difference between the two types of food is large at the end of cooking, which reduces the cooking effect. SUMMARY

[0004] The utility model aims at at least solve microwave cooking utensil when cooking two types of food, the problem that the temperature difference is big at the end of cooking. The purpose is realized through the following technical scheme:

[0005] The utility model provides a microwave cooking utensil, the microwave cooking utensil includes:

[0006] Machine body, the machine body is equipped with cooking cavity, and the cooking cavity includes microwave feed-in position;

[0007] Microwave generating device, the microwave generating device is located in the machine body and is located at the outside of the cooking cavity;

[0008] Antenna assembly, the antenna assembly includes antenna body, the antenna body is located outside the cooking cavity and is located at the microwave feed-in position, and the antenna body can rotate outside the cooking cavity and be used to guide the microwaves generated by the microwave generating device into the cooking cavity;

[0009] Wherein, the antenna body is a plate structure, the antenna body is equipped with a preset area, at least one first feed port is opened 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 of the antenna body rotating outside the cooking cavity is a first spacing, the distance between the rotation axis and the first edge of the side of the antenna body away from the preset area is a second spacing, the second spacing is less than the first spacing, and 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, and the first direction is the arrangement direction of the preset area and the rotation axis of the antenna body.

[0010] The microwave cooking utensil, through setting the preset area on one side of the antenna body, can form the impedance parts with different heights, so that the microwaves mainly radiate out from the first feeding port of the preset area after entering the antenna body, and through setting the value of the first interval in the range of 1 / 3 to 2 / 3 of the wavelength, the feeding port can be in a relatively strong microwave field, so that the directional heating of the food can be realized.

[0011] In addition, by setting the second interval smaller than the first interval, the antenna body is a gravity center offset structure, at this time, the setting of the first feeding port can help improve the balance of the antenna body, so that the antenna body is not easy to shake when rotating. At the same time, since the preset area is located on one side of the antenna body, the orientation of the preset area can be better controlled during the rotation of the antenna body, so that it can better direct the microwaves to the food with lower temperature or slower heating speed, so that the heating speed of the food can be improved while achieving the effect of simultaneous heating, and the use effect of the microwave cooking utensil is guaranteed.

[0012] In addition, the microwave cooking utensil according to the utility model also has the following additional technical features:

[0013] In some embodiments of the utility model, the number of the first feeding port is two, the first feeding port includes two first slits, and the two first slits are cross arranged.

[0014] In some embodiments of the utility model, the preset area further includes a second feeding port, and the second feeding port is located between the first feeding port and the rotation axis along the first direction.

[0015] In some embodiments of the utility model, the number of the second feeding port is two, each second feeding port includes two second slits, and the two second slits are cross arranged.

[0016] In some embodiments of the utility model, one of the two second slits has a first part extending from the cross part towards the direction of the rotation axis, and a second part extending from the cross part towards the opposite direction of the rotation axis, and the extension length of the first part is smaller than that of the second part.

[0017] And / or, the width of the second slit is greater than that of the first slit.

[0018] In some embodiments of this utility model, a first cut is provided on the first edge, and there are multiple first cuts, which are spaced apart along a second direction, which is perpendicular to the first direction.

[0019] In some embodiments of this utility model, the antenna body further includes a second cut, and the antenna body is provided with the second cut on both sides along the second direction, the second direction being perpendicular to the first direction.

[0020] In some embodiments of this utility model, the number of the second cuts is multiple, and the multiple second cuts are spaced apart along the first direction;

[0021] And / or, a third cut is provided on the first edge, and along the second direction, the third cut communicates with at least one edge of the antenna body.

[0022] In some embodiments of this utility model, the first feed port is a rectangular structure, the length direction of the first feed port is perpendicular to the first direction, the length of the first 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, and the width of the first feed port is in the range of 8mm to 15mm.

[0023] 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;

[0024] The antenna body is provided with a sleeve portion, which extends into the waveguide and is coaxial with the rotation axis. The sleeve portion is used to guide microwaves in the waveguide to the antenna body.

[0025] The antenna assembly also includes a drive unit, which is disposed outside the waveguide and outside the cooking cavity, and the drive shaft of the drive unit 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 This is a schematic diagram of one possible structure of the antenna body according to an embodiment of the present utility model;

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

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

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

[0031] Figure 5 for Figure 1 The diagram shows a simulation of the antenna body heating when the microwave cooking appliance is stationary.

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

[0033] 10. Antenna body; 11. First edge;

[0034] 20. Connecting part;

[0035] 30. Preset area;

[0036] 40. First feed opening; 41. First gap;

[0037] 50. Second feed opening; 51. Second gap;

[0038] 60. First incision;

[0039] 70. Second incision;

[0040] 80. Third incision;

[0041] L1, first spacing; L2, second spacing;

[0042] h, length; d, width. Detailed Implementation

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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. In other words, when two types of food (the same type of food but with different initial temperatures, or different types of food) are cooked at the same time, the temperature difference between the two types of food will be large at the end of cooking, thus reducing the cooking effect.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] The microwave generator is located inside the machine body and outside the cooking cavity. At this time, the microwave generator can generate microwaves and transmit the microwaves to the antenna assembly. Meanwhile, the antenna assembly includes an antenna body 10, which is located outside the cooking cavity and at the microwave feed position. The antenna body 10 can rotate outside the cooking cavity and is used to guide the microwaves generated by the microwave generator into the cooking cavity.

[0054] At this time, the antenna body 10 is a plate-shaped structure. The antenna body 10 is provided with a preset region 30. At least one first 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 the first spacing. The distance between the rotation axis and the first edge 11 of the antenna body 10 on the side away from the preset region 30 is the second spacing. The second spacing is less than the 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 arrangement direction of the preset region 30 and the rotation axis of the antenna body 10.

[0055] 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 first feed port 40 of the preset region 30 after entering the antenna body 10. By setting the value of the first spacing within the range of 1 / 3 to 2 / 3 of the wavelength, the feed port can be placed in a strong microwave field, which helps to achieve directional heating of food. At the same time, by setting the second spacing to be smaller than the first spacing, the side of the rotation axis away from the preset region 30 has a smaller impedance, which helps to further increase the amount of microwave radiation output from the first feed port 40, thereby enhancing the directional radiation effect of the antenna body 10. This configuration helps to solve the problem of large temperature differences at the end of cooking when cooking two types of food in existing microwave cookers.

[0056] Furthermore, by setting the second spacing to be smaller than the first spacing, the antenna body 10 is designed with a center-offset structure. In this case, the placement of the first feed port 40 helps improve the balance of the antenna body 10, making it less prone to swaying 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 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.

[0057] It is important to understand that the cooking cavity contains a platform for holding at least two different types or temperatures of food. Below the platform is a microwave feed space. 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.

[0058] 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.

[0059] The antenna body 10 is a metal component with a plate-like structure. A connecting portion 20 is provided on the antenna body 10, which connects to the drive shaft of a rotary motor, allowing the antenna body 10 to rotate around the drive shaft. Figure 1 and Figure 4 As shown, the connecting part 20 is configured as 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 and the axis of the drive shaft are aligned. Optionally, the fastener is screwed to the drive shaft, and the fastener can be a screw, bolt, or stud. By configuring the connecting part 20 as a through hole, the manufacturing difficulty of the antenna body 10 can be effectively reduced, the manufacturing efficiency of the antenna body 10 can be improved, and the impact of the through hole on microwave transmission can be reduced, ensuring the performance of the microwave cooking appliance.

[0060] 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.

[0061] Meanwhile, along the first direction a, there is a second distance L2 between the connecting part 20 and the edge of the antenna body 10 away from the preset region 30, where L1 > L2. In this embodiment, the length of the through hole from the right edge is less than the distance between the through hole and the preset region 30, which is also less than the length of the through hole from the left edge. This setting effectively reduces the impedance on the right side of the through hole (the side away from the first feed port 40), thereby enhancing the directional radiation effect of the antenna body 10.

[0062] 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.

[0063] 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.

[0064] It needs to be further understood that, along the first direction a, the first edge 11 of the antenna body 10 located away from the preset region 30 along the rotation axis is set as a straight line segment. For example... Figure 1 , Figure 3 and Figure 4As shown, the antenna body 10 has a rectangular structure. At this time, the two edges of the antenna body 10 along the second direction b are parallel. At the same time, along the second direction b, there is a third distance L3 between the connecting part 20 and any edge of the antenna body 10. Optionally, L3 < 1 / 2λ, which helps to further reduce the impedance of the antenna body 10 on both sides in the second direction b. Since the total amount of microwaves remains unchanged, most of the microwaves will be radiated from the first feed port 40 into the heating chamber. In addition, by reducing 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 the manufacturing cost.

[0065] Meanwhile, the second edge is the edge of the antenna body 10 that is away from the first edge 11 on the rotation axis. The second edge is set as an arc structure, and the concave surface is set in the direction facing the connecting part 20. This setting helps to improve the radiation effect in the first direction a. In conjunction with the operation of the rotating motor, a circular heating area can be formed below the heating chamber, which helps to increase the heating range of the antenna body 10, ensure the heating effect, and effectively cooperate with the placement of food.

[0066] It should be pointed out that, as Figure 2 The antenna body 10, except for the first edge 11, has an overall arc structure on all other edges, and the concave surface is set towards the connecting part 20. At this time, the antenna body 10 can also form a circular heating area below the heating chamber under the action of the rotating motor.

[0067] Furthermore, there are two first feed ports 40, each first feed port 40 including two first gaps 41, and the two first gaps 41 are arranged in a cross pattern.

[0068] Specifically, by setting two first feed ports 40, the characteristics of the preset region 30 can be enhanced, thereby enabling the preset region 30 to form more contact with the current and radiate more microwave energy. By setting the first feed port 40 to a structure in which two first gaps 41 intersect, it is helpful to further improve the cutting effect of the first feed port 40 on the surface current and ensure the radiation efficiency of the first feed port 40.

[0069] It is necessary to understand that, such as Figure 2As shown, two first feed ports 40 are provided, symmetrically arranged around the connecting portion 20 along the second direction b. Each first feed port 40 has two first gaps 41, which are intersecting. By setting the two first gaps 41 in an intersecting state, the cutting effect on the surface current can be effectively improved. Furthermore, the width of the two first gaps 41 can be adaptively increased to ensure the radiation efficiency of the first feed port 40. Optionally, the two first gaps 41 are perpendicularly intersecting, which allows the first feed port 40 to form a 90° phase difference with the surface current, resulting in better radiation efficiency.

[0070] It needs to be further understood that, besides setting the two first slits 41 in an intersecting state, they can also be set in a parallel state. In this case, the two first slits 41 can still cut the surface current. Optionally, the two first slits 41 can be set at an angle. This helps to further improve the current cutting effect of the first slits 41. Moreover, the width of both first slits 41 can be adaptively increased, such as... Figure 1 , Figure 3 and Figure 4 As shown, the two first gaps 41 are perpendicularly intersecting, which allows the first feed port 40 to form a 90° phase difference with the surface current. Furthermore, by increasing the width of the first gaps 41, the radiation efficiency of the first feed port 40 can be further improved.

[0071] It should be noted that the first feed port 40 can be configured as two first gaps 41, or as one, three, four, etc. When the number of first feed ports 40 is three or more, optionally, at least two adjacent first gaps 41 should be intersecting. For example, configuring the first feed port 40 as a swastika or rice-shaped structure can enrich the shape of the first feed port 40 and ensure the first feed port 40 can cut the current.

[0072] Furthermore, the width of the first slit 41 is greater than or equal to 1 / 12 of the wavelength. Optionally, the width of the first slit 41 is greater than or equal to 8 mm. In this case, the first slit 41 can radiate microwaves to a greater extent in addition to cutting off the current.

[0073] What needs further understanding is, such as Figures 1 to 3As shown, in this embodiment, along the second direction b, the distance between the two first feed ports 40 is within the range of 1 / 9λ to 1 / 3λ. Optionally, the distance between the two first feed ports 40 is greater than 1 / 8λ. On the one hand, this can match the length and width of the first gap 41, increasing the area of ​​the first feed port 40, thereby improving the heating range of the first feed port 40 and the directivity of local heating; on the other hand, it can effectively ensure uniform heating of all parts of the first feed port 40, thereby improving the performance of the antenna body 10.

[0074] It should be noted that when there are two first feed ports 40, the first feed ports 40 may include one or more of transverse slits, longitudinal slits and oblique slits, and may be recombined by different numbers and shapes to ensure that the current is cut, without further restrictions.

[0075] Furthermore, the preset area 30 also includes a second feed port 50, which is located between the first feed port 40 and the rotation axis along the first direction.

[0076] Specifically, by setting a second feed port 50, the characteristics of the preset region 30 can be further enhanced, thereby enabling the preset region 30 to form a greater connection with the current and radiate more microwave energy. At the same time, the setting of the second feed port 50 can also effectively improve the structural balance of the antenna body 10.

[0077] like Figure 1 and Figure 4 As shown, there are two second feed ports 50, each including two second slits 51, which are arranged in a cross configuration. By arranging the two second slits 51 in a cross configuration, the cutting effect on the surface current can be further improved, thereby enhancing the radiation efficiency of the preset region 30. Optionally, the two second slits 51 are arranged in a perpendicular cross configuration, which allows the second feed port 50 to form a 90° phase difference with the surface current. In this case, the radiation efficiency of the preset region 30 is better.

[0078] It is important to further understand that one of the two second slits 51 has a first portion extending from the intersection towards the rotation axis, and a second portion extending in the opposite direction from the intersection towards the rotation axis. The extension length of the first portion is less than the extension length of the second portion. By setting the length of the first portion of the second slit 51 to be less than the extension length of the second portion, the second feed port 50 can cooperate with the first feed port 40 to emit circularly polarized waves with less confusion, thereby obtaining a stronger radiation effect. The emitted circularly polarized microwave waves can achieve uniform heating of the middle part of the preset region 30.

[0079] In addition, in order to further improve the radiation effect of the second feed port 50, the width of the second slit 51 is made greater than the width of the first slit 41. In this case, the width of the second slit 51 is greater than 8mm, and optionally, the width of the second slit 51 is greater than or equal to 10mm, thereby further improving the microwave radiation effect while maintaining the current cutting of the second feed port 50.

[0080] Furthermore, a first cut 60 is provided on the first edge 11, and there are multiple first cuts 60, which are spaced apart along the second direction b.

[0081] Specifically, by setting a first notch 60 on the first edge 11, on the one hand, the impedance on the side of the rotation axis away from the preset area 30 can be reduced, so that some microwaves can be radiated from the first notch 60, thereby improving the radiation effect on that side. On the other hand, it can be used in conjunction with the second feed port 50 to adjust the structural stability of the antenna body 10.

[0082] It is necessary to understand that, such as Figure 1 and Figure 4 As shown, the number of first cuts 60 is set to three, and the three first cuts 60 are spaced apart along the second direction b. The first cuts 60 are formed at the first edge 11 and extend towards the connecting portion 20, thus forming a rectangular opening structure. In this case, the first cuts 60 are parallel to the current direction, and the parallel cuts allow for uniform radiation of microwaves in that direction (although the field strength is not high). Furthermore, since some microwaves are radiated from the first cuts 60, it also helps to enhance the microwave field strength in the central region of the antenna body 10.

[0083] It should be noted that the number of first cuts 60 can be set to one, two, four or five, etc., as long as some microwaves can be radiated from the first cuts 60. Among them, the radiation effect of three first cuts 60 is better, and at this time, the width of the first cuts 60 can also better ensure the microwave output.

[0084] It should be further understood that the antenna body 10 also includes a second notch 70. Along the second direction b, the antenna body 10 has second notches 70 on both sides of the second direction b. By setting the second notch 70, the impedance on the upper and lower sides of the antenna body 10 can be further reduced, so that more microwaves can be radiated from the preset area 30 into the heating chamber, which helps to further increase the directional heating effect of the antenna body 10.

[0085] It is understandable that, such as Figure 1As shown, there are multiple second cuts 70, and these second cuts 70 are spaced apart along the first direction. Optionally, four second cuts 70 are provided, with each pair arranged as a group on both sides of the antenna body 10, and along the first direction a, the second cuts 70 are positioned closer to the connecting portion 20. The arrangement of the second cuts 70 can effectively reduce the impedance on the upper and lower sides of the antenna body 10, and in conjunction with the arrangement of the first cut 60, it helps to further ensure the radiation effect of the antenna body 10.

[0086] In addition, such as Figure 4 As shown, the second cut 70 can also be configured as two, with the two cuts respectively located on the two side edges of the antenna body 10. Optionally, the second cut 70 extends along the first direction a and connects with the first edge 11 and the second edge. In this case, the distance between the preset area 30 and the upper and lower side edges is the shortest, which helps to reduce the actual size of the antenna body 10, reduce manufacturing costs, and ensure that the antenna body 10 has good radiation performance.

[0087] It needs to be further understood that a third notch 80 is provided on the first edge 11, and along the second direction b, the third notch 80 communicates with at least one edge of the antenna body 10. The provision of the third notch 80 can further improve the impedance or radiation effect of the antenna body 10 in the other three directions outside the preset region 30, thereby effectively improving the performance of the microwave heating appliance. Optionally, as... Figure 1 As shown, there are two third cuts 80, located on opposite sides of the first cut 60 along the second direction b. Simultaneously, the two third cuts 80 are connected to the upper and lower edges of the antenna body 10, respectively. Combined with the first cut 60 and the second cut 70, this effectively improves the performance of the antenna body 10. Alternatively, there can be only one third cut 80, and optionally, the third cut 80 can be connected to both the upper and lower edges simultaneously.

[0088] It should be noted that the intervals between the multiple first cuts 60, the intervals between the multiple second cuts 70, the intervals between the first cut 60 and the third cut 80, and the intervals between the second cut 70 and the third cut 80 can all be appropriately determined according to the wavelength of the microwave, and no restrictions are imposed here.

[0089] Furthermore, the first feed port 40 has a rectangular structure, the length direction of the first feed port 40 is perpendicular to the first direction, the length of the first feed port 40 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 width of the first feed port 40 is in the range of 8mm to 15mm.

[0090] Specifically, since the first feed port 40 is located at the point of maximum microwave field strength, by setting the first feed port 40 as a rectangle and defining the relationship between the length h of the first feed port 40 and the wavelength λ of the microwave, the length h of the first feed port 40 can completely cover the position of high microwave field strength, thereby making the impedance at the first feed port 40 higher, and thus enabling the microwave to radiate into the heating chamber to a greater extent.

[0091] It is necessary to understand that, such as Figure 2 As shown, along the first direction a, the connecting part 20 and the first feed port 40 are sequentially arranged. The first feed port 40 has a rectangular structure. The length direction of the first feed port 40 is perpendicular to the first direction a, which is the second direction b. The length h of the first feed port 40 is less than or equal to the wavelength of the microwave, and greater than or equal to 1 / 4 of the microwave wavelength, i.e., 1 / 4λ≤h≤λ, to completely cover the high field strength areas of the microwave, thereby allowing the microwave to pass through the first feed port 40 with a greater amplitude. Optionally, 1 / 4λ≤h<1 / 2λ.

[0092] Meanwhile, it should be understood that the length of the first feed port 40 along the first direction a is the width d of the first feed port 40. In this embodiment, the width d of the first 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 first feed port 40 is 1 / 10λ. This width is better adapted to the bandwidth of microwaves. In this case, the width d of the first feed port 40 is in the range of 8mm to 15mm, which can effectively ensure that the first feed port 40 can perform stable microwave radiation, and helps to further improve the heating width of the first feed port 40, thereby improving the performance of the antenna body 10.

[0093] by Figure 1 Taking the antenna body 10 as an example, a simulation test is performed. At this time, the first feed port 40 is located on the left 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 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. This indicates that the antenna body 10 of this invention has directional heating capability without rotation.

[0094] In the actual test, two cups of milk with different initial temperatures, with an initial temperature difference of 16.1℃, were heated for 3 minutes before testing. The test data are as follows:

[0095] Left side Right side Temperature difference T0 (start) 8.1 24.2 +16.1 T1 (end) 74.3 58.6 -15.7

[0096] 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 16.1℃ to 15.7℃ (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.

[0097] 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).

[0098] 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 first 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 outside the cooking cavity is a first spacing. The distance between the rotation axis and the first 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, and 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.

2. The microwave cooking appliance according to claim 1, characterized in that, The number of the first feed ports is two, and each first feed port includes two first gaps, which are arranged in an intersecting manner.

3. The microwave cooking appliance according to claim 2, characterized in that, The preset area also includes a second feed port, which is located between the first feed port and the rotation axis along the first direction.

4. The microwave cooking appliance according to claim 3, characterized in that, The number of the second feed ports is two, and each second feed port includes two second gaps, and the two second gaps are arranged in an intersecting manner.

5. The microwave cooking appliance according to claim 4, characterized in that, One of the two second gaps has a first portion extending from the intersection toward the axis of rotation, and a second portion extending in the opposite direction from the intersection toward the axis of rotation, wherein the extension length of the first portion is less than the extension length of the second portion; And / or, the width of the second gap is greater than the width of the first gap.

6. The microwave cooking appliance according to claim 1, characterized in that, A first cut is provided on the first edge. There are multiple first cuts, and the multiple first cuts are spaced apart along a second direction, which is perpendicular to the first direction.

7. The microwave cooking appliance according to claim 1, characterized in that, The antenna body also includes a second cut, which is provided on both sides of the antenna body along a second direction, and the second direction is perpendicular to the first direction.

8. The microwave cooking appliance according to claim 7, characterized in that, The number of the second incisions is multiple, and the multiple second incisions are spaced apart along the first direction; And / or, a third cut is provided on the first edge, and along the second direction, the third cut communicates with at least one edge of the antenna body.

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

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 is provided with a sleeve portion, which extends into the waveguide and is coaxial 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 drive unit, which is disposed outside the waveguide and outside the cooking cavity, and the drive shaft of the drive unit passes through the waveguide and is inserted and fixed to the sleeve portion.

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