CN223039118U - Antenna structure and microwave cooking appliance - Google Patents

Abstract

The utility model discloses an antenna structure and a microwave cooking appliance. The antenna structure is used for a microwave cooking appliance, and the antenna structure includes: a waveguide tube, the waveguide tube is provided with a microwave output port; a feed plate, the feed plate is installed at the microwave output port, the feed plate is provided with a plurality of slot feed ports, the plurality of slot feed ports include a first slot feed port, and the first slot feed port is provided at a voltage antinode point of the waveguide tube. In the above antenna structure, the first slot feed port is provided at the voltage antinode port of the waveguide tube, and the first slot feed port can adjust the electric field in the cooking cavity fed into the microwave cooking electric cavity to meet the uniform distribution of microwaves, thereby reducing the use of components such as motors and stirring supports, simplifying the structure of the antenna structure and reducing costs.

Description

Antenna structure and microwave cooking appliance

Technical Field

The utility model relates to the technical field of household appliances, in particular to an antenna structure and a microwave cooking appliance.

Background

In the related art, the microwave heating principle of the microwave cooking appliance is that a magnetron generates microwaves, the microwaves are transmitted into a cavity of the cooking appliance through a waveguide tube, and then an antenna is driven by a bottom motor to rotate and stir the microwaves, so that food is heated more uniformly. However, the microwave antenna stirring system comprises an antenna, a motor, a stirring support and other components, and has a complex structure and high overall cost.

Disclosure of utility model

The embodiment of the utility model provides an antenna structure and a microwave cooking appliance to solve at least one technical problem.

The antenna structure provided by the embodiment of the utility model is used for a microwave cooking electric appliance, and comprises:

The waveguide tube is provided with a microwave output port;

The feed port piece is installed at the microwave output port, the feed port piece is provided with a plurality of gap feed ports, the plurality of gap feed ports comprise first gap feed ports, and the first gap feed ports are arranged at voltage wave antinode points of the waveguide tube.

In the antenna structure, the first gap feed port is arranged at the voltage antinode port of the waveguide tube, and can be used for adjusting an electric field fed into the cooking cavity of the microwave cooking cavity so as to meet the uniform distribution of microwaves, so that the use of components such as a motor, a stirring support and the like can be reduced, the structure of the antenna structure is simplified, and the cost is reduced.

In some embodiments, the plurality of slot feeds includes a second slot feed disposed at a current wave antinode of the waveguide.

In some embodiments, the waveguide includes an input portion and an output portion connected to each other, the input portion is provided with a microwave input port, the output portion is provided with the microwave output port, the output portion has a width W2 and a length L2, a voltage antinode of the waveguide is disposed along an axis w2×1/2, and a current antinode of the waveguide is disposed along an axis l2×1/3 and along an axis l2×2/3.

In certain embodiments, W2 is 65mm to 200mm and l2 is 150mm to 220mm.

In certain embodiments, the width of the input portion is W1, W1 is 65mm to 95mm.

In certain embodiments, the slot feed has a width W3 and a length L3, wherein L3 is 45mm to 70mm and W3 is 12mm to 30mm.

The microwave cooking appliance comprises the antenna structure of any one of the embodiments.

In the microwave cooking appliance, the first gap feed port is arranged at the voltage antinode port of the waveguide tube, and can be used for adjusting the electric field fed into the cooking cavity of the microwave cooking cavity so as to meet the uniform distribution of microwaves, so that the use of components such as a motor, a stirring support and the like can be reduced, the structure of an antenna structure is simplified, and the cost is reduced.

In some embodiments, the microwave cooking appliance comprises a cooking cavity, the feed port piece is arranged on at least one of a top plate, a bottom plate and a side plate of the cooking cavity, and the side plate of the cooking cavity is connected with the top plate of the cooking cavity and the bottom plate of the cooking cavity.

In some embodiments, the microwave cooking appliance includes a microwave generating assembly and an electrical chamber located at a side of the cooking cavity, the microwave generating assembly being located in the electrical chamber and connected to the waveguide.

In some embodiments, the microwave cooking appliance includes a cooling fan located in the electrical compartment for cooling the microwave generating assembly.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the present utility model will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

Fig. 1 is an exploded schematic view of a microwave cooking appliance according to an embodiment of the present utility model;

fig. 2 to 5 are schematic structural views of a feed port sheet according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of quadrant division of a feed-through piece according to an embodiment of the present utility model;

fig. 7 to 14 are schematic structural views of a mouthpiece according to an embodiment of the present utility model;

FIG. 15 is a schematic diagram of a waveguide mode switching structure and electric field distribution according to an embodiment of the present utility model;

Fig. 16 is a schematic cross-sectional view of a microwave cooking appliance in the related art.

Reference numerals for main elements:

The microwave oven comprises an antenna structure 100, a microwave cooking appliance 200, a waveguide 12, a feed port piece 14, a microwave output port 16, a slot feed port 18, a first slot feed port 20, a cooking cavity 22, a microwave generating assembly 24, a cooking cavity 26, a top plate 28, a side plate 30, a bottom plate 32, a through hole 34, a second slot feed port 36, an input part 37, an output part 38, a microwave input port 40, an electric chamber 42, a magnetron 44, a frequency converter 46, an inner partition plate 48, a recess 50, an opening 52 and a cooling fan 54.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present utility model and are not to be construed as limiting the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present utility model, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, as well as, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically indicated and defined. It may be a mechanical connection that is made, or may be an electrical connection. Can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The disclosure herein provides many different embodiments or examples for implementing different structures of the utility model. To simplify the present disclosure, components and arrangements of specific examples are described herein. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

In the related art, as shown in fig. 16, which is an internal structure diagram of a flat microwave oven, a waveguide 400 is provided at the bottom of a cavity, and an antenna system is stirred. The waveguide 400 is riveted on the cavity 500, the magnetron is fixed on the waveguide by a screw, and when the microwave oven works, microwaves generated by the magnetron are transmitted into the cavity through the waveguide, and the bottom motor drives the stirring antenna 600 to rotate continuously, so that microwave fields in the cavity 500 are disturbed.

The microwave heating principle of the microwave cooking appliance is that a magnetron generates microwaves, the microwaves are transmitted into a cavity of the cooking appliance through a waveguide tube, and then the stirring antenna 600 is driven by a bottom motor to rotate and stir the microwaves, so that food is heated more uniformly. However, the above-mentioned microwave antenna stirring system includes the stirring antenna 600, the motor, the stirring support, and other components, and has a complex structure and high overall cost. Moreover, the overall thickness of the microwave stirring system is about 110mm, the occupied bottom space is more, and the whole machine volume rate is small.

Referring to fig. 1 to 5, an antenna structure 100 according to an embodiment of the present utility model is used for a microwave cooking appliance 200. The antenna structure 100 includes a waveguide 12 and a feed tab 14. The waveguide 12 is provided with a microwave output port 16, the feed-through piece 14 is mounted at the microwave output port 16, the feed-through piece 14 is provided with a plurality of slot feed-through openings 18, the plurality of slot feed-through openings 18 comprise a first slot feed-through opening 20, and the first slot feed-through opening 20 is arranged at a voltage antinode of the waveguide 12.

In the antenna structure 100, the first slot feed port 20 is disposed at the voltage antinode port of the waveguide 12, and the first slot feed port 20 can adjust the electric field in the cooking cavity 26 fed into the microwave cooking cavity to satisfy uniform distribution of microwaves, so that the use of components such as a motor and a stirring support can be reduced, the structure of the antenna structure 100 is simplified, and the cost is reduced.

In particular, the antenna structure 100 may be applied to the microwave cooking appliance 200, the microwave cooking appliance 200 including, but not limited to, a microwave oven, a micro-steaming and baking all-in-one machine, an integrated oven, and the like. The microwave cooking appliance 200 comprises a cooking cavity 22 and a microwave generating assembly 24, wherein a cooking cavity 26 is arranged in the cooking cavity 22, food can be placed in the cooking cavity 26, and microwaves can be fed into the cooking cavity 26 through the gap feed port 18 to heat the food in the cooking cavity 26.

Feed tab 14 may be disposed on at least one of top plate 28, side plate 30, and bottom plate 32 of cooking cavity 22, and waveguide 12 may be provided with a corresponding microwave output port 16. In fig. 1, the feed tab 14 is disposed on the top plate 28 of the cooking cavity 22, and in particular, the top plate 28 of the cooking cavity 22 is provided with a through hole 34, the feed tab 14 may cover the through hole 34, and the waveguide 12 may be connected to the outer side of the top plate 28 and cover the through hole 34. The microwave generating assembly 24 is connected to the waveguide 12, and the microwave generating assembly 24 is operable to generate microwaves, which are conducted through the waveguide 12 to the feed port plate 14 for feeding into the cooking cavity 26 through the slot feed port 18.

In some embodiments, the multi-feed port source is arranged at the top or bottom of the cooking cavity 22, the bottom of the cooking cavity 22 is stretched downwards within 15mm, the thicknesses (about 50 mm) of the stirring antenna and the motor are not required to be reserved, the problem that the volume of the electric appliance bin at the bottom is overlarge is effectively solved, and the volume rate of the whole machine can be improved by about 20%.

When the structural dimensions of the waveguide 12 are determined, the voltage antinode of the waveguide 12 may be determined by simulation or the like, so that the first slot feed 20 may be provided at the voltage antinode of the waveguide 12. The first slot feed 20, which is located at the voltage antinode of the waveguide 12, can adjust the electric field uniformity within the cooking cavity 26. The position and size of the first slot feed 20 corresponding to the requirement for electric field uniformity can be determined by simulation.

In some embodiments, the plurality of slot feeds 18 includes a second slot feed 36, the second slot feed 36 being disposed at a current antinode of the waveguide 12.

Thus, the microwave cooking appliance 200 may be made to satisfy energy efficiency requirements.

Specifically, after the structural dimensions of the waveguide 12 are determined, the current antinode point of the waveguide 12 may be determined by simulation or the like, so that the second slot feed 36 may be provided at the current antinode point of the waveguide 12. The second slot feed 36 at the current antinode of the waveguide 12 can adjust the energy efficiency level of the microwave cooking appliance 200, thereby enabling the microwave cooking appliance 200 to meet the energy efficiency requirements. The position and size of the corresponding second slot feed 36 when the energy efficiency requirements are met can be determined by simulation.

In one embodiment, referring to fig. 4, the number of slot feed openings 18 is three, the three slot feed openings 18 are all first slot feed openings 20, and the three first slot feed openings 20 are rectangular, that is, when the electric field uniformity requirement of the microwave cooking appliance 200 is met by the design of the three first slot feed openings 20, the energy efficiency requirement of the microwave cooking appliance 200 is also met. In this case, the second slot feed 36 may be omitted.

In one embodiment, referring to fig. 5, the number of slot feed openings 18 is six, and the six slot feed openings 18 are all arc-shaped, wherein the four larger slot feed openings 18 are all first slot feed openings 20 for adjusting the electric field uniformity of the microwave cooking appliance 200. The smaller two slot feed openings 18 may serve as the first slot feed opening 20 and the second slot feed opening 36 at the same time, that is, the smaller two slot feed openings 18 may be used to adjust the electric field uniformity of the microwave cooking appliance 200 and the energy efficiency level of the microwave cooking appliance 200 at the same time. The smaller two slot feed 18 is capable of cutting into the induction line of waveguide 12. It will be appreciated that the number of slot feeds 18 may be two or three or more.

Fig. 2 to 3 and fig. 7 to 14 show the positions and shapes of the plurality of slot feed openings 18, respectively, however, the embodiment of the utility model is not limited thereto, and the slot feed openings 18 can adjust the electric field uniformity and the energy efficiency requirements of the microwave cooking appliance 200 to meet the corresponding requirements.

The electric field uniformity and energy efficiency requirements of the microwave cooking appliance 200 may be two factors that are balanced with each other. In one embodiment, the energy efficiency requirement of the microwave cooking appliance 200 may be satisfied again in the case that the electric field uniformity of the microwave cooking appliance 200 is previously satisfied. In one embodiment, the electric field uniformity of the microwave cooking appliance 200 may be satisfied again in the case where the energy efficiency requirement of the microwave cooking appliance 200 is previously satisfied.

It will be appreciated that in some embodiments, all of the slot feed 18 are first slot feed 20.

In some embodiments, the slot feed 18 includes a first slot feed 20 and a second slot feed 36, one or more slot feeds 18 can act as both a first slot feed 20 and a second slot feed 36, one or more slot feeds 18 can act as a first slot feed 20, and one or more slot feeds 18 can act as a second slot feed 36.

In some embodiments, the slot feed 18 includes a first slot feed 20 and a second slot feed 36, one or more slot feeds 18 can act as both the first slot feed 20 and the second slot feed 36, and one or more slot feeds 18 can act as the first slot feed 20.

In some embodiments, the slot feed 18 includes a first slot feed 20 and a second slot feed 36, one or more slot feeds 18 may act as both a first slot feed 20 and a second slot feed 36, and one or more slot feeds 18 may act as a second slot feed 36.

In some embodiments, the slot feed 18 includes a first slot feed 20 and a second slot feed 36, one or more slot feeds 18 may be the first slot feed 20 and one or more slot feeds 18 may be the second slot feed 36.

In some embodiments, the slot feed 18 includes a first slot feed 20 and a second slot feed 36, with all slot feeds 18 acting as both the first slot feed 20 and the second slot feed 36.

In some embodiments, referring to fig. 1 and 15, the waveguide 12 includes an input portion 37 and an output portion 38 connected to each other, the input portion 37 is provided with a microwave input port 40, the output portion 38 is provided with a microwave output port 16, the output portion 38 has a width W2 and a length L2, a voltage antinode of the waveguide 12 is disposed along an axis w2×1/2, and a current antinode of the waveguide 12 is disposed along an axis l2×1/3 and along an axis l2×2/3.

Thereby, the slot feed 18 can be set according to the size of the output portion 38.

Specifically, in fig. 1, the microwave cooking appliance 200 further includes an electric chamber 42, the electric chamber 42 is located at one side (right side in fig. 1) of the cooking cavity 22, the microwave generating assembly 24 is disposed in the electric chamber 42, the microwave generating assembly 24 includes a magnetron 44 and a frequency converter 46, the frequency converter 46 is connected to the magnetron 44, the frequency converter 46 is used for supplying power to the magnetron 44, and a microwave output window of the magnetron 44 extends into the microwave input port 40 of the input portion 37. The output 38 is disposed above the top plate 28 of the cooking cavity 22 and covers the through hole 34.

As shown in fig. 1, the antenna structure 100 is provided with a slot feed 18 at the end, and the microwave emitted from the magnetron 44 passes through an input portion 37 with a width W1, then the size is changed to a width W2 by a conversion structure, and an output portion 38 with a length L2 converts the transmission mode into a TE20 mode, and finally the induced current is cut by the slot feed 18 to generate radiation, so that the microwave is fed into the cooking cavity 26. Fig. 15 shows a schematic diagram of a waveguide mode switching structure and electric field distribution.

The feed tab 14 may be configured as a feed end that is the same size as the output 38. In order to satisfy both energy efficiency and heating uniformity, the form and position of the slot feed 18 of the feed plate 14 need to be designed according to a certain rule, and the feed plate 14 can be divided into a plurality of quadrants according to the distribution of the electric field propagated in the waveguide by the TE20 mode. Referring to fig. 6 and 15, in the embodiment of the present utility model, the feed port plate 14 is divided into six quadrants 1, 2, 3, 4, 5, and 6 at w2×1/2, l2×1/3, l2×2/3 according to the W2 and L2 sizes. Wherein, the axis along L2X1/3 is Y1, the axis along L2X1/3 is Y2, and the voltage wave node and the current wave antinode are both at Y1 and Y2. Along the axis W2X1/2, X1, where X1, λ/4, λ/2 and 3λ/4 are the voltage antinode and the current node (λ is the wavelength of the incident microwave), at which the electric field strength is strongest, please refer to the voltage antinode for quadrant 14, quadrant 25 and quadrant 36 in conjunction with FIGS. 6 and 15, λ/4, λ/2 and 3λ/4, respectively. In combination with the profiling and height of the cooking cavity 22, rectangular slot feed 18 of length L3 and width W3 or equilong arc slot feed 18 are provided in six quadrants. By adjusting the length L3, width W3, and the position of the quadrant in which the slot feed 18 is located, the microwave oven energy efficiency and electric field uniformity can be improved, thereby improving food cooking uniformity.

It will be appreciated that in other embodiments, the feed tab 14 is not limited to the quadrant division described above, and that other quadrant divisions are possible.

In certain embodiments, W2 is 65mm (millimeters) to 200mm and l2 is 150mm to 220mm.

Thereby, the output portion 38 of the waveguide 12 can be sized to meet the demand.

Specifically, the width of the output portion 38 is W2, the length is L2, and W2 is 65mm to 200mm, that is, 65 mm≤W2≤200 mm. In some examples, w2=65 mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 120mm, 150mm, 170mm, 180mm, 185mm, 190mm, 195mm, 200mm, or other values from 65mm to 200mm.

L2 is 150mm to 220mm, that is, 150 mm≤L2≤220 mm. In some examples, l2=150 mm, 155mm, 160mm, 165mm, 170mm, 175mm, 180mm, 185mm, 190mm, 195mm, 200mm, 205mm, 210mm, 215mm, 220mm, or other values from 150mm to 220mm.

W2 is 65mm to 200mm, L2 is 150mm to 220mm, and the size of the output part 38 can meet the space requirement and the function requirement of the microwave cooking appliance 200.

In certain embodiments, the width of the input 37 is W1, W1 is 65mm to 95mm.

Thereby, the input portion 37 of the waveguide 12 can be set to be sized to meet the demand.

Specifically, the width of the input portion 37 is W1, and W1 is 65mm to 95mm, that is, 65 mm≤W1≤95 mm. In some examples, w1=65 mm, 67mm, 70mm, 75mm, 80mm, 85mm, 90mm, 92mm, 95mm, or other values from 65mm to 95mm.

W1 is 65mm to 95mm, and the size of the input part 37 can be made to satisfy the space requirement and the functional requirement of the microwave cooking appliance 200. In the embodiment shown in fig. 15, W2> W1, the antenna structure 100 terminates in a slot feed 18, and microwaves emitted from the magnetron 44 first pass through a length of input section 37 having a width W1, and then change size to a width W2 and length L2 of output section 38 by a switching structure.

It will be appreciated that the length of the input 37 may be determined according to actual requirements.

In some embodiments, referring to FIG. 4, the slot feed 18 has a width W3 and a length L3, where L3 is 45mm to 70mm and W3 is 12mm to 30mm.

Thus, the size of the slot feed 18 can satisfy the electric field uniformity design and the energy efficiency requirement design of the microwave cooking appliance 200.

Specifically, the slit feed opening 18 has a width W3 and a length L3, and W3 is 12mm to 30mm, that is, 12 mm≤W3≤30mm. In some examples, w3=12 mm, 15mm, 20mm, 25mm, 27mm, 30mm, or other values from 12mm to 30mm.

L3 is 45mm to 70mm, that is, 45 mm≤L3≤70 mm. In some examples, l3=45 mm, 47mm, 50mm, 55mm, 60mm, 65mm, 67mm, 70mm, or other values from 45mm to 70mm.

A microwave cooking appliance 200 according to an embodiment of the present utility model includes the antenna structure 100 according to any of the above embodiments.

In the above-mentioned microwave cooking appliance 200, the first slot feed port 20 is disposed at the voltage antinode port of the waveguide 12, and the first slot feed port 20 can adjust the electric field in the cooking cavity 26 fed into the microwave cooking cavity to satisfy the uniform distribution of microwaves, so that the use of components such as a motor and a stirring support can be reduced, the structure of the antenna structure 100 is simplified, and the cost is reduced.

Specifically, microwave cooking appliance 200 includes cooking cavity 22, electric chamber 42, and microwave generating assembly 24. The antenna structure 100 may be mounted on the cooking cavity 22. An electric chamber 42 is located on one side of the cooking cavity 22, a microwave generating assembly 24 is located on the electric chamber 42, and the microwave generating assembly 24 includes a microwave source and a power source, the power source being connected to the microwave source. In the present embodiment shown in fig. 1, the microwave source comprises a magnetron 44 and the power supply comprises a frequency converter 46, the frequency converter 46 powering the magnetron 44. The magnetron 44 is operative to output microwaves through a microwave output window, which are transmitted through the waveguide 12 to the feed tab 14, and the slot feed 18 feeds the microwaves into the cooking cavity 26. It will be appreciated that in other embodiments, the microwave source may comprise a radio frequency module.

In certain embodiments, the microwave cooking appliance 200 includes a cooking cavity 22, with the feed tab 14 disposed on at least one of a top plate 28, a bottom plate 32, and a side plate 30 of the cooking cavity 22, the side plate 30 of the cooking cavity 22 connecting the top plate 28 of the cooking cavity 22 and the bottom plate 32 of the cooking cavity 22.

Thus, the corresponding feed tabs 14 may be configured according to the space of the microwave cooking appliance 200.

Specifically, in the embodiment shown in fig. 1, the feed tab 14 is provided on the top plate 28 of the cooking cavity 22. Specifically, the cooking cavity 22 includes a U-shaped plate, the top plate 28 of the U-shaped plate is provided with a through hole 34, the feed plate 14 may cover the through hole 34, and the output portion 38 of the waveguide 12 may be attached to the outer side surface of the top plate 28 and cover the through hole 34. When the microwave cooking appliance 200 is activated in a microwave mode, the magnetron 44 operates to generate microwaves that are transmitted through the waveguide 12 and inductively radiate a plurality of incident waves of different phases into the cooking cavity 26 through the slot feed 18, achieving uniform heating of the food.

In fig. 1, the microwave cooking appliance 200 further includes an inner partition 48, the bottom plate 32 of the cooking cavity 22 is provided with a recess, and the inner partition 48 is provided on the bottom plate 32 of the cooking cavity 22 and covers the recess 50. The microwave cooking appliance 200 is a flat plate type microwave cooking appliance 200. It is understood that in other embodiments, the microwave cooking appliance 200 may be a turntable microwave cooking appliance 200.

In one embodiment, the feed tab 14 may be disposed on the floor 32 of the cooking cavity 22, and in particular, the floor 32 of the U-shaped plate is provided with a through hole 34, the feed tab 14 may cover the through hole 34, and the output portion 38 of the waveguide 12 may be attached to the underside of the floor 32 and cover the through hole 34.

In one embodiment, the feed tab 14 may be provided on a side plate 30 of the cooking cavity 22. Specifically, the side plate 30 of the cooking cavity 22 is provided with a through hole 34, the feed tab 14 may cover the through hole 34, and the output portion 38 of the waveguide 12 may be attached to the outer side surface of the side plate 30 and cover the through hole 34.

In one embodiment, the feed tab 14 may be provided on any two or three of the top panel 28, bottom panel 32, and side panel 30 of the cooking cavity 22. In one embodiment, the side panels 30 include a left side panel 30, a right side panel 30, and a rear side panel 30 of the cooking cavity 22.

In certain embodiments, microwave cooking appliance 200 includes microwave generating assembly 24 and electrical chamber 42, electrical chamber 42 being located at a side of cooking cavity 22, microwave generating assembly 24 being located at electrical chamber 42 and being connected to waveguide 12.

Thus, the electrical compartment 42 may protect the microwave generating assembly 24 from damage to the microwave generating assembly 24 to some extent.

Specifically, in fig. 1, the electric room 42 is located at the right side of the cooking cavity 22, and a control panel may be installed at the front side of the electric room 42, and may be electrically connected to the microwave generating assembly 24, and used to control the operation of the microwave cooking appliance 200. The front side of the cooking cavity 22 is provided with a door (not shown) rotatably coupled to the cooking cavity 22, the front side of the cooking cavity 22 is provided with an opening 52 communicating with the cooking cavity 26, and the door is adapted to open and close the opening 52. Alternatively, the antenna structure 100 may be provided on the door body.

Optionally, microwave cooking appliance 200 includes a housing (not shown) that houses cooking cavity 22 and electric chamber 42 on the left side of cooking cavity 22, on the right side of electric chamber 42, and on top of cooking cavity 22 and electric chamber 42.

In certain embodiments, microwave cooking appliance 200 includes cooling fan 54, cooling fan 54 being located in electric compartment 42, cooling fan 54 being used to cool microwave generating assembly 24.

Thus, the microwave generating assembly 24 may be operated at a suitable temperature to some extent.

Specifically, in fig. 1, the cooling fan 54 may be located rearward of the microwave generating assembly 24. The microwave generating assembly 24 is operated to generate a large amount of heat, and the cooling fan 54 is operated to cool the microwave generating assembly 24. In one embodiment, when the cooling fan 54 is operated, the hot air in the electric room 42 may be blown rearward of the microwave cooking appliance 200, and the microwave generating module 24 and other components in the electric room 42 may be cooled. In one embodiment, cooling fan 54 may be operated to draw in cool air from behind microwave cooking appliance 200 to cool microwave generating assembly 24 and other components within electrical compartment 42.

In summary, the microwave cooking appliance 200 according to the embodiment of the present utility model can realize multi-phase microwave feeding through the multi-slot feed port 18 after microwave mode conversion, replace the original microwave stirring system, reduce the overall cost, improve the uniformity of microwaves, and realize the reduction of the size of the bottom appliance bin and effectively improve the overall volume rate of the microwave cooking appliance 200 by replacing the microwave stirring system at the bottom with the waveguide of the multi-slot feed port 18.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents.

Claims (10)

1. An antenna structure for a microwave cooking appliance, the antenna structure comprising:

The waveguide tube is provided with a microwave output port;

The feed port piece is installed at the microwave output port, the feed port piece is provided with a plurality of gap feed ports, the plurality of gap feed ports comprise first gap feed ports, and the first gap feed ports are arranged at voltage wave antinode points of the waveguide tube.

2. The antenna structure of claim 1, wherein the plurality of slot feeds comprises a second slot feed, the second slot feed being disposed at a current antinode of the waveguide.

3. The antenna structure according to claim 2, wherein the waveguide comprises an input portion and an output portion connected to each other, the input portion is provided with a microwave input port, the output portion is provided with the microwave output port, the output portion has a width W2 and a length L2, a voltage antinode of the waveguide is disposed along an axis w2×1/2, and a current antinode of the waveguide is disposed along an axis l2×1/3 and along an axis l2×2/3.

4. An antenna structure according to claim 3, characterized in that W2 is 65mm to 200mm and l2 is 150mm to 220mm.

5. An antenna structure according to claim 3, wherein the width of the input portion is W1, W1 being 65mm to 95mm.

6. The antenna structure of claim 1, wherein the slot feed has a width W3 and a length L3, wherein L3 is 45mm to 70mm and W3 is 12mm to 30mm.

7. A microwave cooking appliance comprising an antenna structure according to any one of claims 1-6.

8. The microwave cooking appliance of claim 7, wherein the microwave cooking appliance comprises a cooking cavity, the feed tab is disposed on at least one of a top plate, a bottom plate, and a side plate of the cooking cavity, and the side plate of the cooking cavity connects the top plate of the cooking cavity and the bottom plate of the cooking cavity.

9. The microwave cooking appliance of claim 8, comprising a microwave generating assembly and an electrical chamber, the electrical chamber being located at a side of the cooking cavity, the microwave generating assembly being located in the electrical chamber and coupled to the waveguide.

10. The microwave cooking appliance of claim 9, wherein the microwave cooking appliance includes a cooling fan located in the electrical compartment, the cooling fan configured to cool the microwave generating assembly.