Microwave cooking utensil

Abstract

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

Description

Technical Field

[0001] The invention relates to the technical field of microwave heating, and in particular to a microwave cooking device. Background Art

[0002] When a microwave cooking appliance is cooking food, a microwave generating device feeds microwaves into 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 ingredients but different initial temperatures, different ingredients) are cooked at the same time, at the end of cooking, the temperature difference between the two types of food is large, thereby reducing the cooking effect. Summary of the invention

[0004] The purpose of the present invention is to at least solve the problem that when a microwave cooker cooks two types of food, the temperature difference at the end of cooking is large. This purpose is achieved by the following technical solutions:

[0005] The present invention provides a microwave cooking device, which comprises:

[0006] A machine body, wherein the machine body is provided with a cooking cavity, and the cooking cavity includes a microwave feeding position;

[0007] A microwave generating device, the microwave generating device is arranged in the body and located outside the cooking cavity;

[0008] An antenna assembly, the antenna assembly comprising an antenna body, the antenna body being arranged outside the cooking cavity and located at the microwave feeding position, the antenna body being capable of rotating outside the cooking cavity and being used to introduce microwaves generated by a microwave generating device into the cooking cavity;

[0009] In which, the antenna body is a plate-like structure, the antenna body is provided with a preset area, and at least one 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 is a 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 arrangement direction of the preset area and the rotation axis of the antenna body. Along the second direction, the antenna body has a first width, and the first width is less than the wavelength of the microwave. The second direction is perpendicular to the first direction. Along the second direction, the preset area is symmetrically arranged with the rotation axis as the center.

[0010] The microwave cooking device of the present invention can form different impedance parts by setting a preset area on one side of the antenna body, so that the microwaves are mainly radiated from the feed port of the preset area after entering the antenna body. At the same time, 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 relatively strong microwave field intensity, which helps to achieve directional heating of food. At the same time, by setting the first width of the antenna body to be smaller than the wavelength, the impedance of the antenna body on both sides in the second direction can be reduced, so that most of the microwaves are radiated from the feed port, which helps to further enhance the effect of directional radiation of the antenna body and helps to solve the problem of large temperature differences at the end of cooking when the existing microwave cooker cooks two types of food.

[0011] In addition, by setting the preset area symmetrically with the rotation axis as the center, the antenna body can be made symmetrical in the second direction, so that the antenna body is not easy to shake when rotating. Moreover, by limiting the position of the preset area, the direction of the preset area can be better controlled in conjunction with the rotation of the antenna body, so that the microwave can be better directed to food with a lower temperature or a slower heating rate, thereby achieving the effect of simultaneous heating, increasing the heating speed of the food and ensuring the use effect of the microwave cooking appliance. In addition, by setting the first width of the antenna body to be smaller than the wavelength, the actual size of the antenna body can be reduced, thereby reducing the manufacturing cost.

[0012] In addition, the microwave cooking device according to the present invention may also have the following additional technical features:

[0013] In some embodiments of the present invention, the number of the feed openings is set to one, and the feed opening is a rectangular structure;

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

[0015] In some embodiments of the present invention, the number of the feed openings is set to two, and along the second direction, the two feed openings are arranged at intervals.

[0016] In some embodiments of the present invention, the feed port includes two slots, and the two slots are arranged crosswise;

[0017] Alternatively, the feed port includes two slits, and the two slits are arranged in parallel.

[0018] In some embodiments of the present invention, two edges of the antenna body along the first direction are respectively configured as arc-shaped structures, and the arc-shaped structures protrude in a direction away from the rotation axis.

[0019] In some embodiments of the present invention, a first compensation opening is provided on the antenna body, and along the first direction, the first compensation opening and the preset area are correspondingly provided on opposite sides of the rotation axis;

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

[0021] In some embodiments of the present invention, along the first direction, there is a second distance between the first compensation opening and the rotation axis, and the second distance is smaller than the first distance.

[0022] In some embodiments of the present invention, the antenna body further has a second compensation opening, the second compensation opening is arranged between the preset area and the rotation axis, and the opening area of ​​the second compensation opening is smaller than the opening area of ​​the first compensation opening.

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

[0024] In some embodiments of the present invention, along the first direction, the rotation axis is at the same distance from two edges of the antenna body;

[0025] And / or, the microwave generating device includes a magnetron and a waveguide tube, one end of the waveguide tube is connected to the magnetron, the other end of the waveguide tube is connected to the outer wall of the cooking cavity and is arranged opposite to the microwave feeding position, the antenna body is provided with a sleeve portion, the sleeve portion extends into the waveguide tube and is coaxially arranged with the rotation axis, the sleeve portion is used to guide the microwaves in the waveguide tube to the antenna body, the antenna assembly also includes a driving member, the driving member is arranged outside the waveguide tube and is located outside the cooking cavity, and the driving shaft of the driving member passes through the waveguide tube and is plugged and fixed to the sleeve portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0027] Figure 1A schematic diagram of one structure of an antenna body shown in an embodiment of the present invention;

[0028] Figure 2 It is another structural schematic diagram of the antenna body shown in the embodiment of the present invention;

[0029] Figure 3 A third structural schematic diagram of the antenna body shown in an embodiment of the present invention;

[0030] Figure 4 A fourth structural schematic diagram of the antenna body shown in an embodiment of the present invention;

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

[0032] The symbols in the accompanying drawings are as follows:

[0033] 10. Antenna body;

[0034] 20. Connecting part;

[0035] 30. Preset area;

[0036] 40. Feeding port; 41. Gap;

[0037] 50. The first compensation port;

[0038] 60. Second compensation port;

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

[0040] h, length; d, width. DETAILED DESCRIPTION

[0041] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0042] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described in the text are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0043] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0044] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both above and below orientations.

[0045] In the existing flat-panel microwave ovens, microwaves are fed into the cavity. Most of them have the microwave feed port set at the bottom of the cavity. At this time, after the microwaves are emitted from the magnetron, they are introduced into the cavity through the coupling window at the end of the waveguide to achieve uniform heating.

[0046] However, when faced with two plates of food with different initial temperatures, or different types of ingredients, if you want the food to be heated evenly and have the temperature be basically the same when cooking is finished, the microwaves cannot be completely evenly distributed in the cavity. The microwaves need to be radiated in a directionally manner, concentrating and evenly heating a certain small area, while consuming as little microwaves as possible in other locations.

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

[0048] In order to solve the above technical problems, the present application provides a microwave cooking device for solving the problem that when the existing microwave cooker cooks two types of food, there is a large temperature difference at the end of cooking.

[0049] It should be noted that in the following embodiments, a microwave oven is used as an example to describe the microwave cooking apparatus in this article. However, it is not limited to this. Equipment such as a heating device using microwave heating, a domestic waste treatment machine, or a semiconductor manufacturing device can be arranged with reference to the structure in this article. At the same time, the present application is not limited to the specific structure shown in the following embodiments, and includes structures based on the same technical idea.

[0050] In terms of overall design, the microwave cooking appliance includes a body, a microwave generating device and an antenna assembly. The body is provided with a cooking cavity, which has a storage space for placing items to be heated. Optionally, the cooking cavity can accommodate at least two portions of food. At the same time, the cooking cavity includes a microwave feeding position. The microwave generating device is arranged in the body and located outside the cooking cavity.

[0051] The microwave generating device is arranged in the machine body and outside the cooking cavity. At this time, the microwave generating device can generate microwaves and transmit the microwaves to the antenna assembly. At the same time, the antenna assembly includes an antenna body, which is arranged outside the cooking cavity and located at the microwave feeding position. The antenna body can rotate outside the cooking cavity and is used to introduce the microwaves generated by the microwave generating device into the cooking cavity.

[0052] At this time, the antenna body 10 is a plate-like structure, and the antenna body 10 is provided with a preset area 30, and at least one feed port 40 is opened in the preset area 30, so that the impedance of the antenna body 10 outside the preset area 30 is less than the impedance of the preset area 30, and along the first direction a, the distance between the geometric center of the preset area 30 and the rotation axis is a 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 a is the arrangement direction of the preset area 30 and the rotation axis of the antenna body 10. At the same time, along the second direction b, the antenna body 10 has a first width D, and the first width D is less than the wavelength of the microwave. The second direction b is perpendicular to the first direction a, and along the second direction b, the preset area 30 is symmetrically arranged with the rotation axis as the center.

[0053] Specifically, by setting a preset area 30 on one side of the antenna body 10, a high and low impedance portion can be formed, so that after the microwave enters the antenna body 10, it is mainly radiated from the feed port 40 of the preset area 30. At the same time, by setting the value of the first spacing L1 within the range of 1 / 3 to 2 / 3 of the wavelength, the feed port 40 can be placed in a relatively strong microwave field intensity, which helps to achieve directional heating of food. At the same time, by making the first width D of the antenna body 10 smaller than the wavelength, the impedance of the antenna body 10 in the second direction b can be reduced, so that most of the microwaves are radiated from the feed port 40, which helps to further enhance the directional radiation effect of the antenna body 10, thereby solving the problem of large temperature differences at the end of cooking when the existing microwave cooker cooks two types of food.

[0054] In addition, by setting the preset area 30 symmetrically with the rotation axis as the center, the antenna body 10 can be made symmetrical in the second direction b, so that the antenna body 10 is not easy to shake when rotating. Moreover, by limiting the position of the preset area 30, the direction of the preset area 30 can be better controlled in conjunction with the rotation of the antenna body 10, so that it can better project microwaves to foods with lower temperatures or slower heating rates, thereby achieving the effect of simultaneous heating, increasing the heating rate of food and ensuring the use effect of the microwave cooking appliance. In addition, by setting the first width D of the antenna body 10 to be smaller than the wavelength, the actual size of the antenna body 10 can also be reduced, reducing the manufacturing cost.

[0055] It should be understood that a loading platform is provided inside the cooking cavity for carrying food, and a microwave feeding space is provided below the loading platform. In this case, the antenna body 10 can be rotatably provided in the microwave feeding space and radiate heat above the loading platform. At the same time, the microwave generating device includes a magnetron and a waveguide tube, wherein the magnetron is provided in the body and located outside the cooking cavity, one end of the waveguide tube is connected to the magnetron, and the other end of the waveguide tube is connected to the outer wall of the cooking cavity and located below the microwave feeding space. In this case, the other end of the waveguide tube is arranged opposite to the microwave feeding position. At the same time, a sleeve portion is provided on the antenna body 10, and the sleeve portion extends into the waveguide tube and is arranged coaxially with the rotation axis. In this case, the sleeve portion is used to guide the microwave in the waveguide tube to the antenna body 10.

[0056] In this embodiment, the antenna assembly further includes a driving member, which is arranged outside the waveguide and outside the cooking cavity, and the driving shaft of the driving member passes through the waveguide and is plugged and fixed with the sleeve. Specifically, in the vertical direction downward, the microwave feeding space, the waveguide and the driving member are arranged in sequence, and the driving shaft of the driving member passes through the waveguide and extends into the microwave feeding space and is connected to the antenna body 10. Optionally, the microwave cooking appliance further includes a rotating motor, in which case the rotating motor is in transmission connection with the antenna body 10 and can make the antenna body 10 rotate around the driving shaft of the rotating motor.

[0057] The antenna body 10 is a metal part and is arranged in a plate-like structure. A connecting portion 20 is arranged on the antenna body 10. The connecting portion 20 is used to connect to the driving shaft of the rotating motor and enable the antenna body 10 to rotate around the driving shaft. Figure 1 and Figure 4 As shown, the connection part 20 is set as a through hole. In this case, the antenna body 10 can be connected to the drive shaft through a fastener passing through the through hole, and the axis of the through hole and the axis of the drive shaft are located in the same straight line. Optionally, the fastener is threaded with the drive shaft, wherein the fastener can be set as a screw, a screw or a stud. By setting the connection part 20 as a through hole, the difficulty of manufacturing the antenna body 10 can be effectively reduced, the manufacturing efficiency of the antenna body 10 can be improved, and the influence of the through hole on microwave transmission can be reduced, thereby ensuring the use effect of the microwave cooking device.

[0058] In this embodiment, along the first direction a, the distances between the connection portion 20 and the two edges of the antenna body 10 are the same. Figure 1 and Figure 4As shown, along the second direction b, the connection part 20 is arranged in the central area of ​​the antenna body 10. At this time, the connection part 20 is at the same distance from the two edges of the antenna body 10 in the second direction b, which helps to ensure that the microwave radiation in the second direction b is more uniform. When the rotating motor is working, since the connection part 20 is at the same length from the left and right sides of the antenna body 10, the antenna body 10 is a plate-like structure with uniform thickness, so that the weight of the left and right sides of the antenna body 10 is relatively consistent, and it is not easy to shake when the antenna body 10 rotates, and the amount of microwaves passing through the left and right sides of the antenna body 10 is the same or similar, so that the overall uniformity of food heating is easier to achieve.

[0059] It is important to understand that Figure 1-Figure 4 As shown, along the first direction a, the preset area 30 is arranged on one side of the connecting portion 20, and has a first spacing L1 with the connecting portion 20, and the value of the first spacing L1 is in the range of 1 / 3 to 2 / 3 of the wavelength λ in the tube, that is, 1 / 3λ≤L1≤2 / 3λ. Since the field intensity of the microwave is large and the microwave transmission efficiency is high when the distance from the axis of the antenna body 10 is 1 / 3λ to 2 / 3λ, the flow of microwaves in the preset area 30 can be effectively guaranteed by limiting the value range of the first spacing L1 to between 1 / 3λ and 2 / 3λ, thereby further improving the heating effect of the preset area 30. Optionally, the first spacing L1 is 1 / 2λ.

[0060] At the same time, along the second direction b, the preset area 30 is symmetrically arranged with the connecting portion 20 as the center, wherein the first direction a is perpendicular to the second direction b and is arranged parallel to the plate body. Such an arrangement can make the microwave output from the preset area 30 uniform and symmetrical, which helps to improve the heating effect of the microwave cooking device. In this embodiment, the preset area 30 includes at least one feed port 40. By setting one or more feed ports 40, the antenna body 10 can adjust the range of microwave directional heating by increasing the number of feed ports 40, and help to improve the radiation effect of the preset area 30. In addition, it also helps to ensure the subsequent optimization design, so that the antenna body 10 can be adjusted according to the actual size of the microwave oven.

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

[0062] It should be further understood that the two edges of the antenna body 10 along the first direction a are respectively set as arc structures, and the arc structures are convex in the direction away from the rotation axis. By setting the edges on both sides of the antenna body 10 to be arc-shaped, it is helpful to improve the radiation effect of microwaves in the first direction a. And 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 can effectively cooperate with the placement of food.

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

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

[0065] Specifically, since the preset area 30 is located at the maximum microwave field intensity, 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 in the tube, the length h of the feed port 40 can completely cover the position of high microwave field intensity, thereby making the impedance here higher, and thus allowing the microwave to radiate to the heating chamber to a greater extent. At the same time, since the microwaves emitted by the magnetron have frequency fluctuations, therefore, by making the width d of the feed port 40 within the range of 8mm to 15mm, it can be effectively ensured that the feed port 40 can perform stable microwave radiation.

[0066] It is important to understand that Figure 2As shown, along the first direction a, the preset area 30 and the connecting portion 20 are arranged in sequence, the preset area 30 includes a feed port 40, and the feed port 40 is a rectangular structure. At this time, the length direction of the feed port 40 is perpendicular to the first direction a, that is, the second direction b, and the width direction of the feed port 40 is the first direction a. Among them, the length h of the feed port 40 is less than or equal to the wavelength in the tube, and greater than or equal to 1 / 4 of the wavelength in the tube, that is, 1 / 4λ≤h≤λ, so as to completely cover the position of high field intensity of microwaves, thereby allowing microwaves to pass through the feed port 40 to a greater extent. Optionally, 1 / 4λ≤h<1 / 2λ. At the same time, the width d of the feed port 40 is in the range of 8mm to 15mm. At this time, the value range of the width d of the feed port 40 is between 1 / 12λ and 1 / 8λ. This width is better adapted to the bandwidth of microwaves and can ensure stable radiation of microwaves.

[0067] It should be pointed out that if Figure 1 As shown, since the antenna body 10 has no other feed ports 40 except the preset area 30, the impedance at these positions is very small, that is, low impedance positions, and effective current cutting cannot be formed. The amount of microwaves radiated from these positions is also very small, so the microwaves will mainly radiate from the positions with feed ports 40. At this time, the preset area 30 is a high impedance position.

[0068] Further, the number of the feed openings 40 is set to two, and along the second direction b, the two feed openings 40 are arranged at intervals.

[0069] Specifically, by setting two feed ports 40, the characteristics of the preset area 30 can be increased, so that the preset area 30 can form more fit to the current to radiate more microwave energy. At the same time, the two feed ports 40 are arranged at intervals along the second direction b, which helps to improve the heating range of the preset area 30 and the directionality of local heating, thereby effectively improving the use effect of the antenna body 10.

[0070] It is important to understand that Figure 1-Figure 4 As shown, the direction of the connecting portion 20 facing the feed port 40 is the first direction a shown in the figure, and the second direction b is perpendicular to the first direction a and is also perpendicular to the axial direction of the through hole. Along the second direction b, the two feed ports 40 are arranged at intervals and symmetrically with the through hole as the center. Such an 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 the food.

[0071] Further, the feed port 40 includes two slots 41 , and the two slots 41 are cross-arranged, or the feed port 40 includes two slots 41 , and the two slots 41 are parallel-arranged.

[0072] Specifically, by setting the feed port 40 as two slots 41, it is helpful to adaptively increase the width of the two slots 41, thereby ensuring the radiation efficiency of the feed port 40. Setting the two slots 41 to be parallel or cross-set can effectively cut and cover the surface current, thereby ensuring the radiation effect of the preset area 30.

[0073] It is important to understand that Figure 1 and Figure 3 As shown, the two slits 41 are in a cross state, so as to effectively improve the cutting effect on the surface current, and at this time, by adjusting the width of the two slits 41, the radiation efficiency of the feed port 40 can be effectively guaranteed. Optionally, the two slits 41 are in a vertically cross state, so that the two slits 41 are vertically cross, so that the feed port 40 forms a phase difference of 90° with the surface current, and at this time, the radiation efficiency of the feed port 40 is better.

[0074] like Figure 4 As shown, the two slits 41 can be set to a parallel state. At this time, the two slits 41 can still cut the surface current. Among them, the two slits 41 can be set in parallel, or inclined, which helps to further improve the cutting effect of the slit 41 on the current. Moreover, the widths of the two slits 41 can be adaptively increased. In this embodiment, the two slits 41 are respectively set to an arc structure, and the two arcs are set in parallel. At this time, the feed port 40 cuts the surface current at multiple angles, which helps to ensure the radiation efficiency of the feed port 40.

[0075] It should be noted that the feed port 40 may also include a plurality of slits 41, wherein the number of slits 41 may be set to three, four, five, etc. Among them, more than three slits 41 may be cross-set and converged at one point, or may be set to connect two adjacent slits 41. At the same time, in order to ensure the cutting effect of the feed port 40, the width of the slit 41 will decrease as the number of slits 41 increases. In order to ensure the radiation effect of the feed port 40, the width of the slit 41 may be at least greater than or equal to 8 mm, and the specific width size is not limited here.

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

[0077] Specifically, by providing the first compensation opening 50 , part of the microwaves will be radiated from the first compensation opening 50 , which helps to enhance the microwave field intensity in the central area of ​​the antenna body 10 , thereby helping to ensure the uniformity of the antenna body 10 as a whole.

[0078] It is important to understand that Figure 4As shown, along the first direction a, the antenna body 10 is sequentially provided with a preset area 30, a connection part 20 and a first compensation port 50, and the first compensation port 50 is closer to the connection part 20 (rotation axis) than the preset area 30. By setting the first compensation port 50 on the side of the connection part 20 (rotation axis) away from the preset area 30, the radiation amount on this side can be effectively increased, and then the other food can be better heated, thereby improving the heating speed of the food under the condition that the two plates are heated at the same time (different ingredients or initial temperatures have large differences). At the same time, the opening area of ​​the first compensation port 50 is smaller than the overall opening area of ​​the preset area 30. By adjusting the distance and the opening area, it is helpful to further increase the weight of each side of the antenna body 10, thereby ensuring that the antenna body 10 is not easy to shake when rotating. Moreover, by setting the first compensation port 50, the field strength in the central area can be compensated, so that better overall uniformity can be achieved.

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

[0080] Specifically, by limiting the distance between the first compensation opening 50 and the connecting portion 20 and making the shape of the first compensation opening 50 symmetrical, on the one hand, it helps to ensure the stability of the antenna body 10 during rotation, and on the other hand, it can ensure that the food at this position can be heated evenly, which helps to improve the use effect of the antenna body 10.

[0081] It is important to understand that Figure 1 As shown, the first compensation opening 50 is set to be rectangular, and at this time, along the first direction a, there is a second spacing L2 between the first compensation opening 50 and the connecting portion 20 (rotation axis), L2<L1. The length direction of the first compensation opening 50 is perpendicular to the first direction a, that is, the length direction of the first compensation opening 50 is the second direction b, and the width direction of the first compensation opening 50 is the first direction a. Among them, the length of the first compensation opening 50 is greater than the length of the preset area 30 in the second direction b, so that the microwave can pass through the first compensation opening 50 to a greater extent, thereby improving the radiation effect of the first compensation opening 50. At the same time, the width of the feed port 40 is greater than 8mm, and the area of ​​the first compensation opening 50 is smaller than the area of ​​the preset area 30. Such a setting helps to ensure the stability of the overall structure of the antenna body 10 during rotation, and can also improve the heating efficiency under the condition of satisfying the same heat of two plates (different ingredients or initial temperatures have large differences).

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

[0083] Specifically, by providing the second compensation opening 60, the first compensation opening 50 can be used to further enhance the microwave field intensity in the central area of ​​the antenna body 10, thereby achieving better overall uniformity. At the same time, the second compensation opening 60 can also be used in conjunction with the preset area 30, thereby further ensuring the directional heating capability of the antenna body 10, and helping to further improve the use effect of the microwave cooking appliance.

[0084] It is important to understand that Figure 4 As shown, along the first direction a, the antenna body 10 is provided with a preset area 30, a first compensation opening 50, a connecting portion 20 and a first compensation opening 50 in sequence. In this embodiment, the opening area of ​​the second compensation opening 60 is smaller than the opening area of ​​the first compensation opening 50. When part of the microwave passes through the second compensation opening 60, the radiation intensity on the side where the preset area 30 is located on the antenna body 10 can be effectively increased, and the directional heating capability of the antenna body 10 can be effectively guaranteed. At the same time, the provision of the second compensation opening 60 can make the opening area of ​​the first compensation opening 50 adaptively increased, thereby helping to further enhance the microwave field intensity in the central area of ​​the antenna body 10, and when the microwave passes through the second compensation opening 60, part of the heat will also move closer to the central area, which also helps to enhance the microwave field intensity in the central area of ​​the antenna body 10 and increase the heating range of food.

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

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

[0087] It is important to understand that Figure 4 As shown, the second compensation opening 60 and the first compensation opening 50 are both set to be rectangular, and at this time, the length direction of the second compensation opening 60 is the second direction b, and the width direction of the first compensation opening 50 is the first direction a. There is a first spacing L3 between the second compensation opening 60 and the connecting portion 20. Among them, L3 ≥ L2, that is, compared with the first compensation opening 50, the second compensation opening 60 is farther away from the connecting portion 20. At the same time, the second compensation opening 60 is located between the connecting portion 20 and the preset area 30, that is, the spacing between the second compensation opening 60 and the connecting portion 20 is less than 1 / 2 of the wavelength in the tube. At this time, the second compensation opening 60 can compensate for the field strength in the central area and improve the directional heating ability of the antenna body 10.

[0088] like Figure 5 As shown, through Figure 1The antenna body 10 having the first compensation port 50 and the second compensation port 60 is subjected to a simulation test. At this time, the preset area 30 of the antenna body 10 is located on the left side of the antenna body 10 and is in a static state. Specifically, the water load is measured in the form of a 16-square grid (the initial water temperature is room temperature), and the temperature is detected 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, wherein the color on the right corresponds to the module on the lower side of the temperature gauge, and the color on the left corresponds to the module on the upper side of the temperature gauge. It can be seen that the antenna body 10 of the present invention has directional heating capability.

[0089] In the actual test, two cups of milk with different initial temperatures were used. The temperature difference between the two cups of milk was 19.9℃ at the beginning. After 3 minutes of heating, the test results were as follows:

[0090] Left Right Temperature difference T0(start) 6.9 26.8 19.9 T1(end) 67.0 65.6 1.4

[0091] It can be seen from the above table that when the three-minute heating time is over, the milk on the left and right sides both have a higher temperature, and the temperature difference between the two changes from 19.9°C to 1.4°C (and the milk with a low initial temperature has a higher temperature after cooking), so the milk can be taken out of the oven at the same temperature.

[0092] In summary, the microwave cooking device of the present invention is based on an antenna body 10 made of metal material. By setting a high-impedance portion and a low-impedance portion, that is, setting gaps of different shapes and positions on the antenna body, the antenna body is made to present impedance values ​​with large differences in various directions, thereby cutting the current in various directions to different degrees, thereby allowing the microwave to radiate a larger proportion from a single direction or other desired directions, and ultimately achieving the working condition of two plates with the same heat (different ingredients or initial temperatures have large differences).

[0093] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A microwave cooking device, characterized in that: The microwave cooking appliance comprises: A machine body, wherein the machine body is provided with a cooking cavity, and the cooking cavity includes a microwave feeding position; A microwave generating device, the microwave generating device is arranged in the body and located outside the cooking cavity; An antenna assembly, the antenna assembly comprising an antenna body, the antenna body being arranged outside the cooking cavity and located at the microwave feeding position, the antenna body being capable of rotating outside the cooking cavity and being used to introduce the microwaves generated by the microwave generating device into the cooking cavity; In which, the antenna body is a plate-like structure and is provided with a preset area, and at least one feed port is opened in the preset area so that the impedance of the antenna body outside the preset area is smaller 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, 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 arrangement direction of the preset area and the rotation axis of the antenna body. Along the second direction, the antenna body has a first width, and the first width is smaller than the wavelength of the microwave. The second direction is perpendicular to the first direction. Along the second direction, the preset area is symmetrically arranged with the rotation axis as the center.

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

3. The microwave cooking device according to claim 1, characterized in that: The number of the feed openings is set to two, and along the second direction, the two feed openings are arranged at intervals.

4. The microwave cooking device according to claim 3, characterized in that: The feed port includes two slots, and the two slots are cross-arranged; Alternatively, the feed port includes two slits, and the two slits are arranged in parallel.

5. The microwave cooking device according to claim 1, characterized in that: Two edges of the antenna body along the first direction are respectively configured as arc-shaped structures, and the arc-shaped structures protrude in a direction away from the rotation axis.

6. The microwave cooking device according to claim 1, characterized in that: A first compensation opening is provided on the antenna body, and along the first direction, the first compensation opening and the preset area are correspondingly provided on opposite sides of the rotation axis; And along the second direction, the first compensation opening is symmetrically arranged with the rotation axis as the center.

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

8. The microwave cooking device according to claim 7, characterized in that: The antenna body further has a second compensation opening, which is arranged between the preset area and the rotation axis, and an opening area of ​​the second compensation opening is smaller than an opening area of ​​the first compensation opening.

9. The microwave cooking device according to claim 8, characterized in that: Along the first direction, a third distance is defined between the second compensation opening and the rotation axis, and the third distance is greater than or equal to the second distance.

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

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