Microwave heating structure and microwave type household appliance

Abstract

The invention relates to the technical field of household appliances, and particularly discloses a microwave heating structure and a microwave type household appliance. According to the microwave heating structure provided by the invention, the reflecting part is arranged on the side opposite to the microwave outlet in the waveguide cover, and the axis of the microwave inlet and the axis of the microwave outlet form the included angle, so that microwaves entering from the microwave inlet are reflected by the reflecting part, the microwaves are uniformly dispersed by the reflecting part, and the microwaves are prevented from being damaged due to the edge-free design of the reflecting part; the uniformly dispersed microwaves enter the cooking cavity through the microwave outlet, and before entering the cooking cavity, the stirring assembly stirs the microwaves discharged through the microwave outlet to enable the microwaves to be reflected in different directions, so that the uniformity of the microwaves entering the cooking cavity is further improved, and the food processing effect is improved; and moreover, the speed of the microwaves entering the cooking cavity is increased, and the working efficiency of the microwave type household appliance is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a microwave heating structure and a microwave household appliance. Background Art

[0002] Microwaves are a type of electromagnetic wave. The microwave heating structure used in household appliances usually consists of components such as a waveguide cover, a magnetron, a frequency converter, and a fan. The frequency converter converts AC power into DC power, which is then input into the magnetron. The magnetron raises the voltage to about 4000V. Under the excitation of the power supply, the magnetron continuously generates microwaves, which are then coupled into the cooking cavity through the waveguide cover. There is a rotatable stirrer near the entrance of the cooking cavity. The rotation of the stirrer can distribute the microwave energy in the cooking cavity.

[0003] In the prior art, microwaves enter the cooking cavity unevenly, resulting in inconsistent progress in food processing, with some food being over-processed and others being under-processed.

[0004] Therefore, it is urgent to provide a microwave heating structure and a microwave household appliance to solve the above technical problems. Summary of the invention

[0005] The object of the present invention is to provide a microwave heating structure and a microwave household appliance, which can make the microwaves entering the cooking cavity more uniform and improve the effect of food processing.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In one aspect, a microwave heating structure is provided, comprising:

[0008] A waveguide cover, wherein the waveguide cover comprises a microwave inlet and a microwave outlet, wherein the axis of the microwave inlet is arranged at an angle to the axis of the microwave outlet, and a plurality of reflectors are arranged on a side of the waveguide cover opposite to the microwave outlet, and the surfaces of the reflectors have no edges or corners;

[0009] a magnetron, the magnetron being in communication with the microwave inlet;

[0010] The stirring component is at least partially arranged at the microwave outlet, and at least a part of the structure of the stirring component can rotate relative to the waveguide cover to reflect the microwave in different directions.

[0011] As an optional technical solution of the above-mentioned microwave heating structure, a plurality of the reflectors are evenly distributed around the microwave outlet.

[0012] As an optional technical solution to the above-mentioned microwave heating structure, the reflector includes a boss, a first end of the boss is connected to the inner wall of the waveguide cover, a surface of the boss is free of edges and corners, and a height of the boss is less than or equal to a and greater than or equal to 1 / 2a, where a is the distance between the microwave outlet and the first end of the boss.

[0013] As an optional technical solution to the above-mentioned microwave heating structure, the waveguide cover includes a first cavity and a second cavity which are interconnected, the first cavity and the second cavity are in an L-shaped structure, the microwave inlet is arranged on a side wall of the first cavity away from the second cavity, the reflector is arranged on a side wall of the second cavity close to the first cavity, and the microwave outlet is arranged on a side wall of the second cavity opposite to the reflector.

[0014] As an optional technical solution to the above-mentioned microwave heating structure, the waveguide cover includes a shell with an opening on one side, the shell is L-shaped, the opening is L-shaped, a first cover plate and a second cover plate are provided at the opening, the first cover plate is connected to the shell to form the first cavity, the microwave inlet is arranged on the first cover plate, the second cover plate is connected to the shell to form the second cavity, the microwave outlet is arranged on the second cover plate, and the reflector is arranged on the side wall of the shell opposite to the second cover plate.

[0015] As an optional technical solution of the above-mentioned microwave heating structure, one end of the magnetron is inserted into the first cavity through the microwave inlet, and the magnetron is fixed on the waveguide cover.

[0016] As an optional technical solution to the above-mentioned microwave heating structure, the stirring assembly includes a stirring motor, a stirring rod and a stirring blade. The stirring motor is arranged on the outside of the waveguide cover, one end of the stirring rod is connected to the stirring motor drive, and the other end of the stirring rod passes through the microwave outlet and is connected to the stirring blade. The stirring blade has no edges or corners.

[0017] As an optional technical solution to the above-mentioned microwave heating structure, the stirring blade includes a first blade portion and a second blade portion, one end of the first blade portion is connected to the stirring rod, one end of the second blade portion is connected to the other end of the first blade portion at an obtuse angle, and the second blade portion extends in a direction away from the waveguide cover.

[0018] As an optional technical solution of the above-mentioned microwave heating structure, it also includes a heat dissipation component, the heat dissipation component includes a heat dissipation channel, the magnetron is placed in the heat dissipation channel, and a heat dissipation fan is provided at one end of the heat dissipation channel.

[0019] On the other hand, a microwave household appliance is provided, comprising an appliance housing, a cooking cavity being provided in the appliance housing, a microwave heating structure as described above being provided in the appliance housing and at the top outside the cooking cavity, and an opening being provided at the top of the cooking cavity for the microwave to enter.

[0020] Beneficial effects of the present invention:

[0021] The microwave heating structure provided by the present invention has a reflector disposed on a side opposite to the microwave outlet in the waveguide cover, and the axis of the microwave inlet is disposed at an angle to the axis of the microwave outlet, so that the microwaves entering from the microwave inlet are first reflected by the reflector, and the reflector disperses the microwaves evenly. The reflector is designed without edges and corners to avoid damaging the microwaves, and the evenly dispersed microwaves enter the cooking cavity through the microwave outlet. Before entering the cooking cavity, the stirring component stirs the microwaves discharged through the microwave outlet to reflect the microwaves in different directions, thereby further improving the uniformity of the microwaves entering the cooking cavity, improving the effect of food processing, accelerating the speed of the microwaves entering the cooking cavity, and improving the working efficiency of the microwave household appliance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a structural schematic diagram of a microwave heating structure provided by an embodiment of the present invention from a first viewing angle;

[0023] Figure 2 is a structural schematic diagram of a microwave heating structure provided by an embodiment of the present invention from a second viewing angle;

[0024] Figure 3 is a schematic structural diagram of a waveguide cover and a magnetron provided in an embodiment of the present invention;

[0025] Figure 4 is a schematic structural diagram of a waveguide cover provided by an embodiment of the present invention;

[0026] Figure 5 is a schematic structural diagram of a heat dissipation assembly provided by an embodiment of the present invention;

[0027] Figure 6 is a schematic structural diagram of a stirring assembly provided in an embodiment of the present invention;

[0028] Figure 7 It is a schematic diagram of the structure of a stirring blade provided in an embodiment of the present invention.

[0029] In the figure:

[0030] 1. Waveguide cover; 2. Reflector; 3. Magnetron; 4. Stirring assembly; 5. Heat dissipation assembly; 6. Top plate; 7. Frequency converter;

[0031] 11. microwave inlet; 12. microwave outlet; 13. first cavity; 14. second cavity; 15. shell; 151. bottom plate; 152. side plate; 153. folding edge; 16. first cover plate; 17. second cover plate;

[0032] 41. stirring motor; 42. stirring rod; 43. stirring blade; 431. first blade portion; 432. second blade portion;

[0033] 51. heat dissipation channel; 52. heat dissipation fan; 53. cover body. DETAILED DESCRIPTION

[0034] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In view of the problem in the prior art that microwaves enter the cooking cavity unevenly, resulting in inconsistent progress in food processing, with some food being over-processed and others being under-processed, this embodiment provides a microwave heating structure to solve the above technical problem.

[0038] Specifically, Figures 1 to 4As shown, the microwave heating structure provided in this embodiment includes a waveguide cover 1 , a magnetron 3 and a stirring assembly 4 .

[0039] The waveguide cover 1 comprises a microwave inlet 11 and a microwave outlet 12, wherein the axis of the microwave inlet 11 is arranged at an angle to the axis of the microwave outlet 12, and a plurality of reflectors 2 are arranged on a side of the waveguide cover 1 opposite to the microwave outlet 12, and the surface of the reflectors 2 is free of edges and corners. The magnetron 3 is connected to the microwave inlet 11. At least part of the stirring assembly 4 is arranged at the microwave outlet 12, and at least part of the stirring assembly 4 can rotate relative to the waveguide cover 1 to reflect the microwaves in different directions.

[0040] In the microwave heating structure provided in the present embodiment, a reflector 2 is arranged on a side opposite to the microwave outlet 12 in the waveguide cover 1, and the axis of the microwave inlet 12 is arranged at an angle to the axis of the microwave outlet 12, so that the microwaves entering from the microwave inlet 11 are first reflected by the reflector 2, and the reflector 2 evenly disperses the microwaves. The reflector 2 is designed without edges and corners to avoid damaging the microwaves. The evenly dispersed microwaves enter the cooking cavity through the microwave outlet 12. Before entering the cooking cavity, the stirring component 4 stirs the microwaves discharged from the microwave outlet 12 to reflect the microwaves in different directions, thereby further improving the uniformity of the microwaves entering the cooking cavity, improving the effect of food processing, accelerating the speed at which the microwaves enter the cooking cavity, and improving the working efficiency of the microwave household appliance.

[0041] The microwave heating structure is installed on the top of the outer side of the cooking cavity. The top of the outer side of the cooking cavity is provided with a top plate 6 , and the microwave heating structure is installed on the top plate 6 .

[0042] The microwave heating structure also includes a frequency converter 7, which is installed on the top plate 6. The frequency converter 7 converts AC power into DC power, which is input into the magnetron 3. The magnetron 3 raises the voltage to about 4000V. Under the excitation of the power supply, the magnetron 3 continuously generates microwaves, which are then coupled into the cooking cavity through the waveguide cover 1.

[0043] The magnetron 3 and the inverter 7 will generate heat when they are working. In order to ensure that the magnetron 3 and the inverter 7 can work normally, Figure 1 and Figure 5 As shown, the microwave heating structure also includes a heat dissipation component 5, which includes a heat dissipation channel 51. The magnetron 3 and the inverter 7 are respectively placed in the heat dissipation channel 51. A heat dissipation fan 52 is provided at one end of the heat dissipation channel 51. The heat dissipation channel 51 gathers the heat dissipated by the magnetron 3 and the inverter 7 to prevent it from flowing to other places and affecting the normal operation of other components of the microwave heating structure. The heat dissipation fan 52 works to discharge the heat in the heat dissipation channel 51 to reduce the temperature in the heat dissipation channel 51.

[0044] In some embodiments, one end of the heat dissipation channel 51 is open, a fan mounting bracket is disposed at the opening, and the heat dissipation fan 52 is mounted on the fan mounting bracket.

[0045] Optionally, the heat dissipation channel 51 includes a cover body 53 formed by bending a metal plate, the cover body is fixed on the top plate 6 and is arranged together with the top plate 6 to form the heat dissipation channel 51 , and an opening is formed at one end for heat dissipation, and the magnetron 3 and the inverter 7 are arranged in the cover body 53 .

[0046] In some embodiments, continue to refer to Figure 3 and Figure 4 As shown, the waveguide cover 1 includes a first cavity 13 and a second cavity 14 which are interconnected, the first cavity 13 and the second cavity 14 are in an L-shaped structure, the microwave inlet 11 is arranged on the side wall of the first cavity 13 away from the second cavity 14, the reflector 2 is arranged on the side wall of the second cavity 14 close to the first cavity 11, and the microwave outlet 12 is arranged on the side wall of the second cavity 14 opposite to the reflector 2. The structure of the waveguide cover 1 allows the microwave inlet 11 and the microwave outlet 12 to be arranged at an angle, so that the microwaves entering the waveguide cover 1 from the microwave inlet 12 can be first reflected by the reflector 2 and then discharged through the microwave outlet 12.

[0047] Optionally, the first cavity 13 and the second cavity 14 are vertically connected to facilitate the layout of the waveguide cover 1 and the magnetron 3 .

[0048] In some embodiments, the waveguide cover 1 includes a shell 15 with an opening on one side, the shell 15 is L-shaped, the opening is L-shaped, a first cover plate 16 and a second cover plate 17 are provided at the opening, the first cover plate 16 is connected to the shell 15 to form a first cavity 13, the microwave inlet 11 is provided on the first cover plate 16, the second cover plate 17 is connected to the shell 15 to form a second cavity 14, the microwave outlet 12 is provided on the second cover plate 17, and the reflector 2 is provided on the side wall of the shell 15 opposite to the second cover plate 17. Preferably, the first cover plate 16 and the second cover plate 17 are detachably connected to the shell 15 to facilitate the production of the waveguide cover 1, and specifically, the first cover plate 16 and the second cover plate 17 can be connected to the shell 15 by bolts, rivets, etc.

[0049] Further optionally, in order to ensure the structural sealing of the waveguide cover 1, sealing members are respectively provided on the peripheral sides of the first cover plate 16 and the second cover plate 17, and after the first cover plate 16 and the second cover plate 17 are connected to the housing 15, the sealing members seal the connection between the first cover plate 16 and the housing 15 and the connection between the second cover plate 17 and the housing 15. The sealing member can be a rubber pad, which has a certain elasticity, good sealing effect, and low use cost.

[0050] Further optionally, the housing 15 includes a bottom plate 151, the bottom plate 151 is L-shaped, and the edges of the bottom plate 151 are vertically provided with side plates 152, the side plates 152 extend toward the same side of the bottom plate 151, and the side plates 152 and the bottom plate 151 are surrounded to form a cavity with an opening. In order to facilitate production and ensure the sealing of the waveguide cover 1, the bottom plate 151 and the side plates 152 are an integral connection structure, and are formed by bending sheet metal parts, which is simple to produce and process.

[0051] Furthermore, in order to facilitate the connection between the housing 15 and the first cover plate 16 and the second cover plate 17, the edges of the side plates 152 are provided with folded edges 153, which are bent toward the outside of the housing 15, and the first cover plate 16 and the second cover plate 17 are respectively connected to the folded edges 153, which facilitates the installation of the first cover plate 16 and the second cover plate 17 and can also achieve a certain sealing effect. The first cover plate 16 and the second cover plate 17 can be connected to the housing 15 by threaded connection or riveting, which is not specifically limited here.

[0052] The first cover plate 16 and the second cover plate 17 are of an integrated structure, which is formed by bending sheet metal parts, which is easy to process and can effectively ensure the sealing of the waveguide cover 1.

[0053] In some embodiments, one end of the magnetron 3 is inserted into the first cavity 13 through a microwave inlet 11, and the magnetron 3 is fixed on the waveguide cover 1, which improves the stability of the connection between the magnetron 3 and the waveguide cover 1 and ensures that the microwave generated by the magnetron 3 can effectively enter the first cavity 13.

[0054] There are multiple reflectors 2. According to the structure of the waveguide cover 1, the reflectors 2 are arranged on the bottom plate 151 constituting the waveguide cover 1 and are arranged opposite to the second cover plate 17. In order to improve the uniformity of microwave distribution, the multiple reflectors 2 are evenly spaced around the microwave outlet 12 to ensure that the microwaves are evenly reflected and then discharged through the microwave outlet 12.

[0055] There may be two, three, four or more reflectors 2, which are not specifically limited herein. For example, there are three reflectors 2, which are evenly spaced around the microwave outlet 12, and the interval between two adjacent reflectors 2 is 120°.

[0056] In some embodiments, the reflector 2 includes a boss, the first end of which is connected to the inner side wall of the waveguide cover 1, and the surface of the boss is free of edges and corners to avoid damaging the microwave. The second end of the boss extends toward the microwave outlet 12, and the microwave is reflected in different directions after hitting the surface of the boss, thereby making the microwave uniform in the waveguide cover 1.

[0057] In order to improve the energy efficiency of microwaves and make the microwaves uniform, the height of the boss is set to be less than or equal to a and greater than or equal to 1 / 2a, where a is the distance between the microwave outlet 12 and the first end of the boss. The height of the boss cannot be too small to improve the efficiency of the boss in reflecting microwaves, but it is also necessary to ensure that the boss is placed in the waveguide cover 1.

[0058] For example, the boss is in the shape of a truncated cone, and the second end of the boss is an arc surface to avoid damaging the microwaves. Alternatively, the boss is in the shape of a cuboid, and the edges of the boss are all arc surfaces to avoid damaging the microwaves.

[0059] The stirring assembly 4 disposed at the microwave outlet 12 can rotate to allow the microwaves at the microwave outlet 12 to enter the cooking cavity. Figure 6 and Figure 7 As shown, the stirring assembly 4 includes a stirring motor 41, a stirring rod 42 and a stirring blade 43. The stirring motor 41 is arranged outside the waveguide cover 1 and fixedly arranged on the waveguide cover 1. One end of the stirring rod 42 is connected to the stirring motor 41, and the other end of the stirring rod 42 is connected to the stirring blade 43 through the microwave outlet 12. The stirring motor 41 drives the stirring rod 42 to rotate, thereby driving the stirring blade 43 to rotate. The stirring blade 43 stirs the microwaves to reflect the microwaves in different directions, further homogenizes the microwaves, and promotes the microwaves to enter the cooking cavity. The stirring blade 43 has no edges and corners to avoid damaging the microwaves.

[0060] An avoidance hole is provided on the top plate 6 at the top outside of the cooking cavity, and a accommodating cavity is provided between the top plate 6 and the outside of the top of the cooking cavity (the accommodating cavity is not shown in the figure). The stirring blade 43 passes through the avoidance hole and is placed in the accommodating cavity. The microwaves discharged from the microwave outlet 12 enter the accommodating cavity. An opening is provided on the top of the cooking cavity, and the microwaves evenly stirred by the stirring blade 43 enter the cooking cavity through the opening.

[0061] In some embodiments, the stirring motor 41 is disposed on the side of the waveguide cover 1 opposite to the microwave outlet 12 , the stirring rod 42 passes through the side wall of the waveguide cover 1 and the microwave outlet 12 and is connected to the stirring blade 43 , and multiple reflectors 2 are evenly distributed around the waveguide cover 1 .

[0062] In order to improve the uniformity of microwave stirring, the stirring blade 43 includes a first blade portion 431 and a second blade portion 432, one end of the first blade portion 431 is connected to the stirring rod 42, one end of the second blade portion 432 is connected to the other end of the first blade portion 431 at an obtuse angle, and the second blade portion 432 extends in a direction away from the waveguide cover 1. The stirring blade 43 has a simple structure and can achieve effective stirring.

[0063] Further, the first blade portion 431 and the second blade portion 432 are both plate-like structures, and both have no edges and corners, and the connection between the first blade portion 431 and the second blade portion 432 is also an arc transition. Exemplarily, the first blade portion 431 and the second blade portion 432 are both rectangular plate-like structures, and the first blade portion 431 and the second blade portion 432 are both set as rounded corners, and the connection between the first blade portion 431 and the second blade portion 432 is connected by an arc surface.

[0064] Preferably, the stirring blade 43 is a plate-like member, which is bent at a certain angle to form a first blade portion 431 and a second blade portion 432 for easy processing, and the stirring blade 43 can be polished into a component without edges and corners through a polishing process.

[0065] Exemplarily, one stirring blade 43 may be provided, or two, three or more stirring blades 43 may be provided, and the plurality of stirring blades 43 are evenly spaced and distributed around the circumference of the stirring rod to improve stirring efficiency.

[0066] In the microwave heating structure provided by the present application, the microwaves generated by the magnetron 3 are evenly reflected by the reflector 2 in the waveguide cover 1 and then discharged through the microwave outlet 12. At the microwave outlet 12, the microwaves are stirred by the stirring component 4 so that the microwaves enter the cooking cavity. The microwaves are processed twice, which improves the uniformity of the microwaves entering the cooking cavity and improves the effect of food processing. The setting of the stirring component 4 also speeds up the speed at which the microwaves enter the cooking cavity, thereby improving the working efficiency of the microwave household appliance.

[0067] This embodiment also provides a microwave household appliance, including the microwave heating structure described in any of the above embodiments. The microwave household appliance can be a microwave oven, a microwave oven integrated machine, or a microwave oven steamer integrated machine. All household appliances with microwave heating function are within the protection scope of this embodiment.

[0068] The microwave household appliance also includes an appliance housing, a cooking cavity is arranged in the appliance housing, a microwave heating structure is arranged in the appliance housing and on the top outside the cooking cavity, and an opening is arranged on the top of the cooking cavity for microwaves to enter.

[0069] If the microwave household appliance is a microwave oven integrated machine, heating tubes are further provided on both sides, the top and / or the bottom of the outer side of the cooking cavity. The specific structure is prior art and will not be described in detail here. When the microwave oven integrated machine bakes food, the heating tubes and the microwave heating structure can work at the same time. When the microwave oven integrated machine heats food, the microwave heating structure works.

[0070] If the microwave household appliance is a microwave oven-steamer oven all-in-one machine, that is, it integrates a steam generating device, an oven heating device and the above-mentioned microwave heating structure, the steaming, baking and heating functions are independent. The structures of the steam generating device and the oven heating device are specific structures and will not be described in detail here.

[0071] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A microwave heating structure, characterized in that: include: A waveguide cover (1), the waveguide cover (1) comprising a microwave inlet (11) and a microwave outlet (12), the axis of the microwave inlet (11) being arranged at an angle to the axis of the microwave outlet (12), a plurality of reflectors (2) being arranged on a side of the waveguide cover (1) opposite to the microwave outlet (12), and the surfaces of the reflectors (2) being free of edges and corners; a magnetron (3), the magnetron (3) being in communication with the microwave inlet (11); The stirring component (4) is at least partially arranged at the microwave outlet (12); at least a part of the structure of the stirring component (4) is capable of rotating relative to the waveguide cover (1) so as to reflect the microwaves in different directions.

2. The microwave heating structure according to claim 1, characterized in that: The plurality of reflective elements (2) are evenly spaced and distributed around the microwave outlet (12).

3. The microwave heating structure according to claim 1, characterized in that: The reflector (2) comprises a boss, a first end of the boss is connected to the inner side wall of the waveguide cover (1), a surface of the boss is free of edges and corners, and a height of the boss is less than or equal to a and greater than or equal to 1 / 2a, wherein a is the distance between the microwave outlet (12) and the first end of the boss.

4. The microwave heating structure according to claim 1, characterized in that: The waveguide cover (1) comprises a first cavity (13) and a second cavity (14) which are interconnected, the first cavity (13) and the second cavity (14) being in an L-shaped structure, the microwave inlet (11) being arranged on a side wall of the first cavity (13) away from the second cavity (14), the reflector (2) being arranged on a side wall of the second cavity (14) close to the first cavity (13), and the microwave outlet (12) being arranged on a side wall of the second cavity (14) opposite to the reflector (2).

5. The microwave heating structure according to claim 4, characterized in that: The waveguide cover (1) comprises a shell (15) with an opening on one side, the shell (15) is L-shaped, the opening is L-shaped, a first cover plate (16) and a second cover plate (17) are provided at the opening, the first cover plate (16) is connected to the shell (15) to form the first cavity (13), the microwave inlet (11) is arranged on the first cover plate (16), the second cover plate (17) is connected to the shell (15) to form the second cavity (14), the microwave outlet (12) is arranged on the second cover plate (17), and the reflector (2) is arranged on a side wall of the shell (15) opposite to the second cover plate (17).

6. The microwave heating structure according to claim 4, characterized in that: One end of the magnetron (3) is inserted into the first cavity (13) through the microwave inlet (11), and the magnetron (3) is fixed on the waveguide cover (1).

7. The microwave heating structure according to claim 1, characterized in that: The stirring assembly (4) comprises a stirring motor (41), a stirring rod (42) and a stirring blade (43); the stirring motor (41) is arranged outside the waveguide cover (1); one end of the stirring rod (42) is drivingly connected to the stirring motor (41); the other end of the stirring rod (42) passes through the microwave outlet (12) and is connected to the stirring blade (43); the stirring blade (43) has no edges or corners.

8. The microwave heating structure according to claim 7, characterized in that: The stirring blade (43) comprises a first blade portion (431) and a second blade portion (432), wherein one end of the first blade portion (431) is connected to the stirring rod (42), one end of the second blade portion (432) is connected to the other end of the first blade portion (431) at an obtuse angle, and the second blade portion (432) extends in a direction away from the waveguide cover (1).

9. The microwave heating structure according to claim 1, characterized in that: It also comprises a heat dissipation component (5), the heat dissipation component (5) comprising a heat dissipation channel (51), the magnetron (3) is arranged in the heat dissipation channel (51), and a heat dissipation fan (52) is provided at one end of the heat dissipation channel (51).

10. A microwave household appliance, characterized in that: It comprises an electrical appliance housing, wherein a cooking cavity is arranged in the electrical appliance housing, a microwave heating structure as claimed in any one of claims 1 to 9 is arranged at the top of the electrical appliance housing and outside the cooking cavity, and an opening is arranged at the top of the cooking cavity for the microwave to enter.

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