CN221043264U - Waveguide system and microwave cooking appliance - Google Patents

Abstract

The utility model belongs to the technical field of kitchen ware, and discloses a waveguide system and a microwave cooking utensil, wherein the waveguide system comprises a waveguide cavity and a stirring mechanism, the waveguide cavity is provided with a microwave inlet and a microwave outlet, and at least one reflecting plate is arranged in the waveguide cavity; the stirring mechanism is rotatably arranged outside the microwave outlet. Microwaves led in by the microwave inlet can pass out of the microwave outlet after being reflected by the reflecting plate, the angles of the microwaves are changed after being reflected by the reflecting plate, so that the microwaves are dispersed and more uniformly reach the microwave outlet, the microwaves led out of the microwave outlet are emitted to the rotating stirring mechanism, and the microwaves are dispersed more uniformly by the stirring mechanism, so that the microwaves entering the inner container are more uniformly distributed to heat food, the defect that the food is insufficiently or excessively heated locally is avoided, the taste of the food is ensured, and meanwhile, the food which is insufficiently heated locally is not required to be reheated to a preset temperature, so that the heating efficiency is higher.

Description

Waveguide system and microwave cooking appliance

Technical Field

The utility model relates to the technical field of kitchen ware, in particular to a waveguide system and a microwave cooking utensil.

Background

Microwave cooking appliances such as microwave ovens, etc. generally comprise a power supply, a magnetron, a waveguide system, a control circuit and a cavity defined by an inner container. The waveguide system is a core component of the microwave cooking utensil, the magnetron generates microwaves under the excitation of a power supply, and the microwaves are reflected by the waveguide system and then are pumped into the inner container to heat and cook objects in the oven cavity.

The microwave generated by the magnetron is easy to form microwave concentration when being transmitted in a waveguide tube of the waveguide system, namely, the microwave is unevenly distributed in a microwave transmission cavity in the waveguide tube, so that the microwave is easily caused to be focused and ignited at a plurality of positions in the microwave transmission process, the surface of a pipeline of the waveguide tube is locally increased in temperature, a large amount of microwave energy is lost, the uniformity of the microwave which is input into the liner is poor, the food is not heated enough locally or heated excessively locally, the taste of the food is influenced, a better cooking effect cannot be achieved, and the cooking efficiency is low.

Accordingly, there is a need for a waveguide system and a microwave cooking appliance that solve the above problems.

Disclosure of utility model

The utility model aims to provide a waveguide system and a microwave cooking utensil so as to solve the problems of poor food heating uniformity and poor cooking taste caused by poor uniformity of microwaves which are concentrated and injected into a liner in a microwave transmission cavity.

To achieve the purpose, the utility model adopts the following technical scheme:

In one aspect, there is provided a waveguide system comprising:

The microwave oven comprises a waveguide cavity, a first reflecting plate and a second reflecting plate, wherein the waveguide cavity is provided with a microwave inlet and a microwave outlet, and at least one reflecting plate is arranged in the waveguide cavity;

The stirring mechanism is rotatably arranged outside the microwave outlet;

The microwaves introduced from the microwave inlet pass through the microwave outlet after being reflected by the reflecting plate, and enter the inner container of the microwave cooking utensil after being reflected by the stirring mechanism.

As a preferable scheme of the waveguide system provided by the utility model, the waveguide chamber comprises a first chamber and a second chamber which are arranged along a first direction and are communicated, the microwave inlet is arranged on the cavity wall of the first chamber, the microwave outlet is arranged on the cavity wall of the second chamber, and the size of the first chamber in the second direction is larger than the size of the second chamber in the second direction;

The first direction is the axial direction of the microwave inlet, the second direction is the axial direction of the microwave outlet, and the first direction is perpendicular to the second direction;

the reflecting plate and the microwave outlet are respectively arranged on two opposite side walls of the second cavity.

As a preferable mode of the waveguide system provided by the utility model, the waveguide chamber further comprises a third chamber, one side of the third chamber along the first direction is communicated with the first chamber, and one side of the third chamber along the second direction is communicated with the second chamber;

The microwaves in the first chamber reach the reflecting plate after being reflected by the inner wall of the third chamber.

As a preferable mode of the waveguide system provided by the utility model, a plurality of the reflecting plates are provided, and the plurality of the reflecting plates comprise a first reflecting plate and a second reflecting plate;

The first reflecting plate and the second reflecting plate extend along the first direction and are arranged at intervals in a staggered mode, the first reflecting plate is partially positioned on one side of the third cavity, and the second reflecting plate and the microwave outlet are opposite to each other in the second direction.

As a preferable scheme of the waveguide system provided by the utility model, the stirring mechanism comprises a first plate, a second plate and a third plate which are sequentially connected in a bending way, wherein the bending directions of the first plate and the third plate are opposite to each other relative to the second plate, and the third plate is far away from the microwave outlet relative to the first plate.

As a preferable scheme of the waveguide system provided by the utility model, the waveguide system further comprises a rotary driving piece, wherein the rotary driving piece is arranged on one side of the waveguide cavity, which is opposite to the microwave outlet, and a driving shaft of the rotary driving piece penetrates through the waveguide cavity and the microwave outlet and is connected with the first plate.

As a preferred embodiment of the waveguide system provided by the present utility model, the third plate is provided with at least one bar-shaped hole.

As a preferred embodiment of the waveguide system provided by the utility model, at least one reflection blade is convexly arranged on the first plate and/or the second plate and/or the third plate.

As a preferable scheme of the waveguide system provided by the utility model, a rotary impeller mechanism is further arranged in the waveguide cavity, and the rotary impeller mechanism is used for reflecting microwaves.

As the preferable scheme of the waveguide system provided by the utility model, the waveguide system further comprises a refraction plate, wherein the refraction plate is positioned at one side of the stirring mechanism far away from the microwave outlet, and microwaves reflected by the stirring mechanism enter the inner container after being refracted by the refraction plate.

In another aspect, a microwave cooking appliance is provided, including a case and an inner container, the inner container is disposed in the case, and defines an installation cavity with the case, an installation plate is disposed in the installation cavity, and the waveguide system as described above is disposed on the installation plate.

As the preferable scheme of the microwave cooking utensil provided by the utility model, the microwave cooking utensil further comprises a heating device, the inner container comprises a transmission plate, the heating device is arranged on the inner side of the transmission plate, and microwaves conducted by the waveguide system are driven into the inner container through the transmission plate.

The utility model has the beneficial effects that:

The utility model provides a waveguide system and a microwave cooking appliance comprising the waveguide system, wherein a reflecting plate is arranged in a waveguide cavity, and a stirring mechanism is arranged outside a microwave outlet, so that microwaves led in by a microwave inlet can be reflected by the reflecting plate and then pass through the microwave outlet, the microwaves are changed in angle after being reflected by the reflecting plate, so that the microwaves are dispersed and more uniformly reach the microwave outlet, microwaves led out from the microwave outlet are emitted to the stirring mechanism, microwave energy is reflected by the stirring mechanism, the angle of the microwave energy which is emitted to the stirring mechanism is continuously changed due to the fact that the stirring mechanism is rotatable, and further, the angle of the microwave energy which is reflected by the stirring mechanism is also continuously changed, so that the microwaves are scattered by the stirring mechanism to be more uniform, the microwaves which enter into an inner container are more uniformly distributed to heat food, the defect of insufficient local heating or excessive local heating of the food is avoided, the taste of the food is ensured, and meanwhile, the heating efficiency is higher because the food which is not required to be heated to be insufficient locally is not heated to a preset temperature.

Drawings

Fig. 1 is a first view of a microwave cooking appliance provided in an embodiment of the present utility model;

Fig. 2 is a second view of a microwave cooking appliance provided in an embodiment of the present utility model;

FIG. 3 is a first schematic illustration of the mounting of a waveguide system on a mounting plate provided in accordance with an embodiment of the present utility model;

FIG. 4 is a second mounting schematic of a waveguide system on a mounting plate provided in accordance with an embodiment of the present utility model;

FIG. 5 is a schematic diagram of a waveguide system provided in an embodiment of the present utility model;

FIG. 6 is a cross-sectional view of a waveguide system provided by embodiments of the present utility model;

FIG. 7 is a schematic illustration of an upper cassette of a waveguide chamber provided in accordance with an embodiment of the present utility model;

Fig. 8 is a schematic view of a stirring mechanism according to an embodiment of the present utility model.

In the figure:

1. A waveguide chamber; 2. a stirring mechanism; 3. a rotary driving member; 4. a mounting bracket; 5. a refractive plate;

11. A first chamber; 12. a second chamber; 13. a third chamber; 14. a first reflection plate; 15. a second reflection plate; 16. a flanging structure;

111. a microwave inlet; 121. A microwave outlet; 131. An extension plate;

21. a first plate; 22. A second plate; 23. A third plate;

231. A bar-shaped hole;

100. an inner container; 200. a mounting plate; 300. a heating device; 400. a magnetron; 500. a door frame; 600. a layer rack;

101. And a transmissive plate.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; 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 will be understood in specific cases by those of ordinary skill in the art.

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.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Fig. 1 and 2 are schematic views of a microwave cooking apparatus according to the present embodiment. The microwave cooking appliance comprises a box body and an inner container 100, wherein the inner container 100 is arranged in the box body and defines a mounting cavity with the box body, a mounting plate 200 is arranged in the mounting cavity, and a magnetron 400 and a waveguide system are arranged on the mounting plate 200. The magnetron 400 can generate microwaves under the excitation of a power supply, and the microwaves are reflected by the waveguide system and then are injected into the liner 100 to heat and cook food in the liner 100.

As shown in fig. 3 and 4, the mounting plate 200 is provided with an opening, and the waveguide system is mounted at the opening, so that the waveguide system is mounted on the mounting plate 200.

In the prior art, microwaves generated by the magnetron 400 are easy to form microwave concentration when being transmitted in a waveguide tube of the waveguide system, namely, the microwaves are unevenly distributed in a microwave transmission cavity in the waveguide tube, so that the microwaves are easily caused to be focused and ignited at a plurality of positions in the microwave transmission process, the surface of a pipeline of the waveguide tube is locally heated, a large amount of microwave energy is consumed, the uniformity of the microwaves is poor, the local heating of food is insufficient or excessive, the taste of the food is influenced, a better cooking effect cannot be achieved, and the cooking efficiency is low.

Based on the above problems, the present application improves the waveguide system. As shown in fig. 5 and 6, a schematic structural diagram of the waveguide system provided in this embodiment is shown. The waveguide system comprises a waveguide cavity 1 and a stirring mechanism 2, and can solve the problems of poor food heating uniformity and poor cooking taste caused by poor uniformity of microwaves which are concentrated in a microwave transmission cavity and are injected into the liner 100.

Specifically, the waveguide chamber 1 has a microwave inlet 111 and a microwave outlet 121, and at least one reflecting plate is disposed in the waveguide chamber 1; the stirring mechanism 2 is rotatably arranged outside the microwave outlet 121; microwaves introduced from the microwave inlet 111 are reflected by the reflection plate, pass through the microwave outlet 121, and are reflected by the stirring mechanism 2 to enter the inner container 100 of the microwave cooking appliance.

Since the reflecting plate is arranged in the waveguide cavity 1 and the stirring mechanism 2 is arranged outside the microwave outlet 121, microwaves led in by the microwave inlet 111 can pass through the microwave outlet 121 after being reflected by the reflecting plate, the microwaves are changed in angle after being reflected by the reflecting plate, so that the microwaves are dispersed and reach the microwave outlet 121 more uniformly, microwaves led out from the microwave outlet 121 are emitted onto the stirring mechanism 2, so that the microwave energy is reflected by the stirring mechanism 2, the angle of the microwave energy emitted into the stirring mechanism 2 is continuously changed due to the fact that the stirring mechanism 2 is rotatable, and further, the angle of the microwave energy reflected by the stirring mechanism 2 is also continuously changed, so that the microwaves are scattered more uniformly by the stirring mechanism 2, the microwaves entering the inner container 100 are more uniformly distributed to heat food, the defect that the food is insufficiently or excessively heated locally is avoided, the mouthfeel of the food is ensured, and meanwhile, the heating efficiency is higher because the food which is insufficiently heated locally is not required to be reheated to a preset temperature is avoided.

Referring to fig. 3 and 4, the waveguide chamber 1 is located above the opening in the mounting plate 200 and the agitation mechanism 2 is located below the opening in the mounting plate 200.

Referring to fig. 5 and 6, the waveguide chamber 1 includes an upper case and a lower cover plate, which are hermetically fastened together to form the waveguide chamber 1. As shown in fig. 7, a schematic view of the upper case is shown. The upper box body is provided with a flanging structure 16 along the circumferential direction for being connected and fixed with the lower cover plate.

In this embodiment, for convenience of description, the axial direction of the microwave inlet 111 is defined as a first direction, the axial direction of the microwave outlet 121 is defined as a second direction, and the first direction is perpendicular to the second direction. The microwave incidence direction of the magnetron 400 is a first direction, a microwave emitting port of the magnetron is connected to the microwave inlet 111 in a penetrating way, and emitted microwaves are reflected by the inner wall of the waveguide chamber 1 and the reflecting plate and then pass out of the microwave outlet 121. The width direction of the waveguide chamber 1 is a third direction, which is perpendicular to both the first direction and the second direction.

Specifically, referring to fig. 4, 5, 6 and 7, the waveguide chamber 1 includes a first chamber 11 and a second chamber 12 disposed along a first direction and communicating with each other, a microwave inlet 111 is provided at a cavity wall of the first chamber 11, and a microwave outlet 121 is provided at a cavity wall of the second chamber 12, a size of the first chamber 11 in the second direction being larger than a size of the second chamber 12 in the second direction. I.e. the first chamber 11 is higher than the second chamber 12. The height of the first chamber 11 can be adapted to the installation of the magnetron 400, and the second chamber 12 is set thinner to shorten the reflection path of the microwaves, so that the microwaves are reflected to the microwave outlet 121 more quickly.

Referring to fig. 6, the reflecting plate and the microwave outlet 121 are disposed at opposite sidewalls of the second chamber 12, so that microwaves reflected by the reflecting plate can smoothly reach the microwave outlet 121.

Alternatively, referring to fig. 1, 5 and 7, the waveguide chamber 1 further includes a third chamber 13, one side of the third chamber 13 in the first direction communicates with the first chamber 11, and one side of the third chamber 13 in the second direction communicates with the second chamber 12. The microwaves in the first chamber 11 are reflected by the inner wall of the third chamber 13 and reach the reflection plate. The third chamber 13 is provided to increase the microwave transmission efficiency and allow microwaves to reach the stirring mechanism 2 more quickly. If only the first chamber 11 and the second chamber 12 are provided, when microwaves enter the second chamber 12 from the first chamber 11, most of the microwaves are blocked by the cavity wall of the first chamber 11 and reflected back to the first chamber 11, so that the path of the microwaves entering the second chamber 12 from the first chamber 11 is prolonged, the microwave transmission efficiency is reduced, and the microwaves are concentrated in the first chamber 11, thereby increasing the energy consumption in the first chamber 11. By providing the third chamber 13, the conduction path of microwaves to the second chamber 12 is shortened, and microwave energy transmission can be effectively accelerated.

Referring to fig. 7, two extension plates 131 extend from a side of the third chamber 13, which is in communication with the first chamber 11, and the extension plates 131 increase the inner space of the third chamber 13 on one hand and reflect microwaves on the other hand, so that the microwaves are more uniform.

The number and distribution positions of the reflecting plates can be determined according to the results of a plurality of microwave conduction tests, and the optimal arrangement scheme is sought in the tests by changing the number, the size and the arrangement positions of the reflecting plates.

In the present embodiment, exemplarily, referring to fig. 6 and 7, the reflection plates are provided in two, which are the first reflection plate 14 and the second reflection plate 15, respectively. Wherein, the first reflecting plate 14 and the second reflecting plate 15 extend along the first direction and are arranged at intervals in a staggered manner, the first reflecting plate 14 is partially positioned at one side of the third chamber 13, and the second reflecting plate 15 and the microwave outlet 121 are opposite to each other in the second direction. This arrangement allows the best microwave reflection effect and effectively improves the uniformity of microwave transmission into the liner 100.

Referring to fig. 8, the stirring mechanism 2 comprises a first plate 21, a second plate 22 and a third plate 23 which are sequentially connected in a bending way, wherein the bending directions of the first plate 21 and the third plate 23 relative to the second plate 22 are opposite, and the third plate 23 is far away from the microwave outlet 121 relative to the first plate 21. That is, the first plate 21, the second plate 22, and the third plate 23 are sequentially connected in a Z-type structure, providing a plurality of plate surfaces reflecting microwaves.

Further, referring to fig. 5 and 6, the waveguide system further includes a rotary driving member 3, the rotary driving member 3 is disposed at a side of the waveguide chamber 1 facing away from the microwave outlet 121, and a driving shaft of the rotary driving member 3 penetrates the waveguide chamber 1 and the microwave outlet 121 and is connected to the first plate 21. More specifically, the rotary driving member 3 is disposed outside a side wall of the second chamber 12 opposite to the mounting plate 200, and a driving shaft of the rotary driving member 3 is vertically disposed, passes through the second chamber 12 and is directly connected to the first plate 21 or indirectly connected to the first plate 21 through a connecting shaft in a transmission manner, so as to drive the stirring mechanism 2 to rotate. During rotation of the stirring mechanism 2, the first plate 21, the second plate 22 and the third plate 23 can all play a role of reflecting microwaves, so that the microwaves are scattered more uniformly.

Optionally, the third plate 23 is provided with at least one bar-shaped hole 231. Illustratively, in the present embodiment, two strip-shaped holes 231 are disposed side by side on the third plate 23, and the strip-shaped holes 231 are disposed to allow part of the microwaves to directly pass through, thereby expanding the transmission path of the microwaves. That is, a part of the microwaves directed to the third plate 23 is reflected by the third plate 23, and another part may directly pass through the bar-shaped holes 231, so that the transmission paths of the microwaves are more, further increasing the uniformity of the microwaves injected into the liner 100.

Optionally, the first plate 21 and/or the second plate 22 and/or the third plate 23 are provided with at least one reflective vane protruding thereon. The arrangement of the reflecting blades can further reflect microwaves, so that the microwaves are further scattered, the uniformity of the microwaves is improved, and then the food is uniformly heated.

Optionally, a rotary impeller mechanism may be further added in the waveguide chamber 1, where the rotary impeller mechanism is rotatable and is used for reflecting microwaves and stirring the microwaves, so that the microwaves are more uniformly distributed in the liner 100.

Illustratively, the rotary impeller mechanism includes a rotating shaft and a plurality of blade structures circumferentially arranged along the rotating shaft, and the plurality of blade structures effectively break up microwaves during rotation, thereby improving the uniformity of the distribution of microwaves in the liner 100.

Referring to fig. 5, the waveguide system further includes a refraction plate 5, and the refraction plate 5 is located at a side of the stirring mechanism 2 away from the microwave outlet 121, and microwaves reflected by the stirring mechanism 2 are refracted by the refraction plate 5 and then enter the liner 100. The microwave can change the transmission angle after being refracted by the refraction plate 5, so as to enlarge the coverage range of the microwave, that is, the microwave refracted by the refraction plate 5 is dispersed in a horn shape, so that the microwave energy entering the liner 100 is prevented from being concentrated in the middle.

Illustratively, the refraction plate 5 may be a glass plate or an acryl plate.

In the microwave cooking appliance provided in this embodiment, the top wall of the liner 100 is a transmission plate 101, and the refraction plate 5 is embedded in the middle of the transmission plate 101. The transmission plate 101 transmits microwaves, so that microwaves conducted through the waveguide system are driven into the liner 100 through the transmission plate 101.

Optionally, referring to fig. 2, the microwave cooking appliance further includes a heating device 300, and the heating device 300 is mounted to the inner side of the transmissive plate 101. The cooking appliance simultaneously heats the cooking food by the microwave and heating device 300, and improves heating efficiency.

The heating device 300 is illustratively a heating tube coiled inside the transmissive plate 101, or the heating device 300 may also be a heating plate.

Referring to fig. 1 and 2, a door frame 500 is provided at the front side of the inner container 100 for mounting a door body, and food can be taken and placed in the inner container 100 by opening the door body.

Further, both side walls of the liner 100 are provided with a plurality of shelves 600 along the height direction, and the shelves 600 are used for placing trays for supporting food.

The microwave cooking appliance provided in this embodiment is a kitchen ware for heating food by using microwaves, including but not limited to a microwave oven, etc.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (12)

1. A waveguide system, comprising:

A waveguide chamber (1) having a microwave inlet (111) and a microwave outlet (121), at least one reflecting plate being arranged in the waveguide chamber (1);

a stirring mechanism (2) rotatably arranged outside the microwave outlet (121);

Microwaves introduced from the microwave inlet (111) pass through the microwave outlet (121) after being reflected by the reflecting plate, and enter the inner container (100) of the microwave cooking appliance after being reflected by the stirring mechanism (2).

2. The waveguide system according to claim 1, characterized in that the waveguide chamber (1) comprises a first chamber (11) and a second chamber (12) arranged in a first direction and communicating, the microwave inlet (111) being provided in a cavity wall of the first chamber (11), the microwave outlet (121) being provided in a cavity wall of the second chamber (12), a dimension of the first chamber (11) in a second direction being larger than a dimension of the second chamber (12) in the second direction;

The first direction is an axial direction of the microwave inlet (111), the second direction is an axial direction of the microwave outlet (121), and the first direction is perpendicular to the second direction;

the reflecting plate and the microwave outlet (121) are respectively arranged on two opposite side walls of the second chamber (12).

3. The waveguide system according to claim 2, characterized in that the waveguide chamber (1) further comprises a third chamber (13), which third chamber (13) communicates with the first chamber (11) on one side in the first direction, which third chamber (13) communicates with the second chamber (12) on one side in the second direction;

The microwaves in the first chamber (11) reach the reflecting plate after being reflected by the inner wall of the third chamber (13).

4. A waveguide system according to claim 3, characterized in that the reflecting plates are provided in a plurality, the plurality comprising a first reflecting plate (14) and a second reflecting plate (15);

The first reflecting plate (14) and the second reflecting plate (15) extend along the first direction and are arranged at intervals in a staggered mode, the first reflecting plate (14) is partially positioned on one side of the third cavity (13), and the second reflecting plate (15) and the microwave outlet (121) are opposite to each other in the second direction.

5. Waveguide system according to claim 1, characterized in that the stirring mechanism (2) comprises a first plate (21), a second plate (22) and a third plate (23) connected in turn by bending, the bending directions of the first plate (21) and the third plate (23) being opposite to the second plate (22), the third plate (23) being remote from the microwave outlet (121) with respect to the first plate (21).

6. The waveguide system according to claim 5, characterized in that the waveguide system further comprises a rotary drive (3), the rotary drive (3) being arranged on a side of the waveguide chamber (1) facing away from the microwave outlet (121), a drive shaft of the rotary drive (3) penetrating the waveguide chamber (1) and the microwave outlet (121) and being connected to the first plate (21).

7. Waveguide system according to claim 5, characterized in that the third plate (23) is provided with at least one bar-shaped hole (231).

8. Waveguide system according to claim 5, characterized in that the first plate (21) and/or the second plate (22) and/or the third plate (23) are provided with at least one reflective vane protruding thereon.

9. Waveguide system according to any of claims 1-8, characterized in that a rotating impeller mechanism is further provided in the waveguide chamber (1), said rotating impeller mechanism being adapted to reflect microwaves.

10. The waveguide system according to any one of claims 1-8, further comprising a refractive plate (5), wherein the refractive plate (5) is located at a side of the stirring mechanism (2) away from the microwave outlet (121), and microwaves reflected by the stirring mechanism (2) enter the inner container (100) after being refracted by the refractive plate (5).

11. Microwave cooking appliance, characterized by comprising a box body and an inner container (100), wherein the inner container (100) is arranged in the box body and defines an installation cavity with the box body, an installation plate (200) is arranged in the installation cavity, and the waveguide system as claimed in any one of claims 1-10 is arranged on the installation plate (200).

12. The microwave cooking appliance according to claim 11, further comprising a heating device (300), wherein the inner container (100) comprises a transmissive plate (101), wherein the heating device (300) is mounted inside the transmissive plate (101), and wherein microwaves conducted through the waveguide system are driven into the inner container (100) through the transmissive plate (101).