Grounding structure and microwave oven

Abstract

The invention provides a grounding structure and a microwave oven, the grounding structure comprises a frame body and an upper cover plate, the frame body is of a U-shaped frame structure, the upper cover plate is arranged at the top of the frame body, a heating cavity is formed by a space defined by the upper cover plate and the frame body, a first extension edge is arranged on the side edge of the upper cover plate, and a second extension edge is arranged on the side edge of the upper cover plate. A first extending edge is arranged on the top of the frame body and extends in the direction away from the heating cavity, a first boss is arranged on the first extending edge, a second extending edge is arranged on the top of the frame body, a second concave table is arranged on the second extending edge, and the second concave table and the first boss are oppositely arranged. A containing cavity is formed between the second concave table and the first boss, and a grounding piece is installed in the containing cavity. Compared with the prior art that a grounding structure is arranged on a rear plate, the grounding structure is convenient to install, the rear plate cannot be deformed, two coaxial threaded holes are formed in the grounding structure, the fixing strength of the grounding piece is improved, the phenomenon of thread loosening of the grounding piece in the installation process is prevented, and torsion is effectively enhanced.

Description

Technical Field

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

[0002] A microwave oven uses high-frequency microwaves emitted by a magnetron to act on water molecules in food, and utilizes the heat generated by the high-speed movement and friction of water molecules to quickly heat the food, and has become one of the indispensable cooking appliances. As a household appliance with a metal shell, the microwave oven needs to be grounded. In the prior art, the grounding structure of the microwave oven is generally installed on the rear panel. For example, the patent with the publication number CN212987303U in the prior art discloses a grounding structure and a microwave oven. The microwave oven includes a rear panel. The grounding structure includes a grounding piece, a terminal block, and a screw. The grounding piece is arranged on the inner wall surface of the rear panel, and the terminal block is electrically connected to the grounding piece through the screw. By arranging the grounding piece on the inner wall surface of the rear panel, the grounding structure is prevented from being damaged or even exposed under stress conditions. However, in this prior art, the grounding piece is connected to the rear panel through a positioning hole, and the grounding piece is in planar contact with the rear panel. When installing the grounding piece, a force needs to be applied backward, which is prone to slipping of the thread. If the force is not controlled properly when installing the screw, the rear panel or the grounding piece may be damaged or deformed.

[0003] In view of this, the present invention is specifically proposed. Summary of the Invention

[0004] The problem solved by the present invention is that the grounding structure of the existing microwave oven is unreasonable, resulting in complex assembly.

[0005] To solve the above problems, the present invention provides a grounding structure, including a frame body and an upper cover plate. The frame body is set as a U-shaped frame structure, and the upper cover plate is arranged on the top of the frame body. The space surrounded by the upper cover plate and the frame body forms a heating cavity. A first extension edge is arranged on the side edge of the upper cover plate, and the first extension edge is set to extend away from the heating cavity. A first boss is arranged on the first extension edge. A second extension edge is arranged on the top of the frame body, and a second concave is arranged on the second extension edge. The second concave is arranged opposite to the first boss, and a receiving cavity is formed between the second concave and the first boss. A grounding piece is installed inside the receiving cavity.

[0006] Further, the first boss is set as a structure protruding upward, and the second concave is set as a structure recessed downward.

[0007] Further, a first threaded hole is arranged on the first boss, and a second threaded hole is arranged on the second concave. The first threaded hole and the second threaded hole are coaxially arranged.

[0008] Further, the first extended edge is disposed on the side of the upper cover plate facing the electrical cavity, and the first extended edge is configured to extend away from the heating cavity on a plane flush with the upper cover plate.

[0009] Further, the frame body includes a cavity bottom plate, a first side plate, and a second side plate. The cavity bottom plate is horizontally disposed, the first side plate and the second side plate are vertically and parallelly disposed, the second side plate is disposed on the side close to the electrical cavity, and a second extended edge is provided at the top of the second side plate.

[0010] Further, the second extended edge is disposed at the top of the second side plate and extends toward the electrical cavity, and the plane where the second extended edge is located is parallel and abuts against the plane where the first extended edge is located.

[0011] Further, both the first boss and the second concave are provided in two.

[0012] Further, the first boss is formed by local stamping of the first extended edge, and the second concave is formed by local stamping of the second extended edge.

[0013] A microwave oven includes the grounding structure described above.

[0014] Further, it further includes a heating cavity, a door assembly, and a housing. The door assembly is used to open or close the heating cavity. The housing is disposed outside the heating cavity, and an electrical cavity is provided between the housing and the second side plate of the frame body.

[0015] Compared with the prior art, the microwave oven according to the embodiment of the present invention has the following beneficial effects: A grounding structure is provided at the connection part between the upper cover plate and the U-shaped frame. Compared with the prior art where it is provided on the rear plate, it is convenient for installation, will not cause deformation of the rear plate, and two coaxial threaded holes are provided on the upper cover plate and the U-shaped frame of the grounding structure to increase the fixing strength of the grounding piece and prevent the grounding piece from slipping during installation, effectively strengthening the torque. The first boss and the second concave form a semi-closed receiving cavity, which plays a role in receiving and protecting the grounding piece. During the powder spraying process of the upper cover plate, the powder is not easily introduced into the semi-closed space, preventing powder spraying from contaminating the grounding piece, and there is no need to additionally shield the grounding structure during the powder spraying operation, making the operation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural view of the microwave oven according to the embodiment of the present invention; Figure 2 is a schematic structural view of the heating cavity of the microwave oven according to Embodiment 1 of the present invention; Figure 3 is a schematic structural view of the frame body according to Embodiment 1 of the present invention; Figure 4 Front view of the housing described in Embodiment 1 of the present invention; Figure 5 Partial explosion schematic diagram of the microwave oven described in Embodiment 1 of the present invention; Figure 6 Structural schematic diagram of the cavity front plate described in Embodiment 2 of the present invention; Figure 7 Front view of the heating cavity of the microwave oven described in Embodiment 2 of the present invention; Figure 8 is Figure 7 Cross-sectional schematic diagram along side A-A in Figure 9 is Figure 7 Cross-sectional schematic diagram along side B-B in Figure 10 Schematic diagram of the microwave oven described in the embodiment of the present invention after removing the housing; Figure 11 is Figure 10 Partial enlarged view of the boxed part in

[0017] Explanation of reference numerals: 1 - Heating cavity; 11 - Cavity front plate; 111 - Access opening; 112 - Reinforcing structure; 113 - Avoidance structure; 1131 - First avoidance groove; 1132 - Second avoidance groove; 12 - Rear cover; 121 - First protrusion; 122 - Second protrusion; 123 - First avoidance part; 13 - Upper cover plate; 131 - First extension edge; 132 - First boss; 133 - First threaded hole; 134 - Accommodation cavity; 14 - Housing; 141 - First side plate; 1411 - Third protrusion; 142 - Second side plate; 1421 - Second extension edge; 1422 - Second concave platform; 1423 - Second threaded hole; 143 - Cavity bottom plate; 1431 - First groove; 1432 - Second groove; 1433 - Drainage assembly; 1434 - Support platform; 2 - Door assembly; 21 - Second avoidance part; 3 - Housing; 31 - Housing bottom plate; 4 - Control panel; 5 - Roller assembly; 6 - Glass turntable; 7 - Connector; 8 - Turntable motor; 9 - Electrical cavity; 91 - Magnetron; 92 - Fan assembly Detailed implementation manners

[0018] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings. On the premise of no conflict, the technical features of the embodiments of the present invention can be combined with each other.

[0019] It should be noted that all the terms indicating direction and position in the present invention, such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "top", "bottom", "lateral", "longitudinal", "center", etc., are only used to explain the relative position relationship and connection situation between various components under a certain specific state (as shown in the accompanying drawings). They are only for the convenience of describing the present invention, rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, they should not be construed as a limitation to the present invention. In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features.

[0020] In the description of the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", and "coupled" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0021] With the further growth of the single population, microwave ovens are gradually favored by more consumers because of their small occupied space. This not only requires their structures to be more compact, but also needs to increase the capacity ratio of the cooking cavity to improve practicality. The structures of existing microwave ovens are unreasonable, resulting in the inability to balance the convenience of cleaning and the safety of use after being embedded in the compound space. Therefore, the applicant proposes the following technical solutions: Embodiment 1

[0022] As Figures 1-5 shown, a microwave oven includes a heating cavity 1, a door assembly 2, a housing 3, and a control panel 4. The door assembly 2 is used to open or close the heating cavity 1. The heating cavity 1 includes a frame body 14 in a U-shaped frame. The frame body 14 includes a cavity bottom plate 143 arranged horizontally. The cavity bottom plate 143 is provided with a first recess 1431 and a second recess 1432 in a ring shape. The first recess 1431 is located on the outer peripheral side of the second recess 1432 and they are concentrically arranged. A drainage assembly 1433 is arranged in the first recess 1431 and / or the second recess 1432.

[0023] During normal use of the microwave oven, less condensed water is generated and can be collected in the first recess 1431, which is convenient for the user to clean it up after use. At this time, the condensed water will not flow onto the kitchen countertop. When the container is tilted and a large amount of water flows onto the cavity bottom plate 143, part of the water is discharged from the first recess 1431 to the second recess 1432 and flows out through the drainage assembly 1433, which can effectively prevent the condensed water and the like from seeping into the turntable motor 8 along the turntable motor shaft and avoid electrical safety hazard problems. At the same time, the first recess 1431 and the second recess 1432 can strengthen the cavity bottom plate 143 to prevent it from being bent and deformed under external force. In addition, the second recess 1432 is used to place the roller assembly 5 during use, which can increase the effective volume of the heating cavity 1. At the same time, the glass turntable 6 placed on the roller assembly 5 can block the drainage assembly 1433, making the heating cavity 1 more concise and beautiful.

[0024] Preferably, the first recess 1431 and the second recess 1432 are respectively formed by partially depressing the cavity bottom plate 143 downward. The first recess 1431 and the second recess 1432 are at the same height and the projected areas on the horizontal plane are S 1 、S 2 , where S 1 <S 2 is set.

[0025] This setting can make the capacity of the first recess 1431 to hold condensed water greater than that of the second recess 1432. The first recess 1431 can completely hold a small amount of condensed water generated during normal use. At this time, the condensed water will not enter the second recess 1432 nor flow out of the microwave oven. When an accident such as the container being tilted occurs, at this time, part of the water or other liquid will enter the second recess 1432 and be discharged from the drainage assembly 1433, effectively preventing failures such as the turntable motor 8 caused by water seepage and even preventing safety accidents. At the same time, the lower surface of the cavity bottom plate 143 is not flat, preventing water from flowing randomly along the lower surface of the cavity bottom plate 143 and facilitating the cleaning of the installation position where the microwave oven is located.

[0026] As an example of the present invention, a turntable motor mounting portion is provided on the cavity bottom plate 143. The turntable motor mounting portion is located in the second recess 1432. The turntable motor mounting portion partially protrudes upward to form a support platform 1434 for assembling the connector 7. The support platform 1434 and the second recess 1432 are concentrically arranged. This setting can further increase the height of the assembly of the turntable motor shaft of the turntable motor 8, has a good waterproof effect, and at the same time provides an installation space for the assembly of the turntable motor 8, making the structure more compact.

[0027] As an example of the present invention, the drainage component 1433 is a drainage hole, and an annular rib is provided on the outer edge of the bottom of the drainage hole, and the annular rib protrudes from the cavity bottom plate 143. This setting can prevent the water flowing out through the drainage hole from freely flowing along the lower bottom surface of the cavity bottom plate 143 and entering the electrical cavity, thus causing potential safety hazards.

[0028] As an example of the present invention, the frame 14 further includes a first side plate 141 and a second side plate 142 that are vertically and parallelly arranged. The first side plate 141 and the second side plate 142 are located on both sides of the cavity bottom plate 143, and a part of the first side plate 141 protrudes away from the second side plate 142 to form a third protrusion 1411. This setting can further increase the volume of the heating cavity 1, reduce the microwave leakage at the access opening 111, and strengthen the frame 14 to prevent it from bending and deforming.

[0029] As an example of the present invention, the microwave oven further includes a connector 7, a roller assembly 5, and a glass turntable 6. The roller assembly is located between the cavity bottom plate 143 and the glass turntable 6. The upper part of the connector 7 is limit-assembled with the glass turntable 6, and the lower part of the connector 7 passes through the support platform 1434 and is drivingly connected to the turntable motor 8 to drive the glass turntable 6 to rotate. This setting can increase the mechanical strength of the cavity bottom plate 143 by using the support platform, and at the same time provide an installation space for the assembly of the turntable motor 8, ensuring that the overall occupied space of the driving device is small and the structure is more compact.

[0030] Preferably, the microwave oven further includes a housing 3, and the housing 3 includes a housing bottom plate 31. A through hole is provided at a position corresponding to the turntable motor 8 on the housing bottom plate 31. This setting can dissipate heat from the turntable motor 8 and at the same time discharge the condensed water from the housing bottom plate 31.

[0031] Embodiment 2

[0032] Existing microwave ovens can well prevent microwave leakage through the door structure design. However, for smaller microwave ovens, due to size changes, relatively serious microwave leakage occurs. Therefore, the applicant makes the following improvements on the basis of Embodiment 1: As Figures 6-9 shown, the microwave oven further includes: An upper cover plate 13, which is covered on the top opening of the U-shaped structure, and the minimum height difference between the upper cover plate 13 and the bottom of the frame 14 is H 2 ; A rear cover 12, one side edge of the rear cover 12 is connected to the upper cover plate 13, and the remaining side edges of the rear cover 12 are all connected to the frame 14; The front panel 11 of the cavity is disposed opposite to the rear cover 12 and is connected to the frame 14 and the upper cover plate 13. An access opening 111 is provided on the front panel 11 of the cavity. The width and height of the access opening 111 are L 1 and H 1 respectively. The width of the frame 14 is L 2 , where L 1 < L 2 and H 1 < H 2 .

[0033] For a microwave oven, generally, the size of the access opening 111 is the same as that of the heating cavity 1, which is not only convenient for taking and placing food, but also has no visual blind area, facilitating the cleaning of the interior of the microwave oven. However, reducing the size of the access opening 111 is generally considered to be disadvantageous for taking and placing food, especially for a microwave oven, which will further reduce the practicality. However, through research, it is found in this application that for a microwave oven, although the existing structure can also meet the leakage test standard, the leakage value is relatively high. By reducing the size of the access opening 111, the microwave leakage value can be significantly reduced, making it safer for users to use.

[0034] As an example of the present invention, a reinforcing structure 112 is provided at the access opening 111. The reinforcing structure 112 is formed by bending the front panel 11 of the cavity 150° - 180° toward the side close to the frame 14. There is a gap between the free end of the reinforcing structure 112 and the frame 14 or the upper cover plate 13. This setting can not only strengthen the access opening 111, but also make there be a gap between the free end of the reinforcing structure 112 and the frame 14 or the upper cover plate 13 to form a groove structure, effectively reducing the leakage of microwaves from the edge of the access opening 111.

[0035] As an example of the present invention, the reinforcing structure 112 is located on the side of the front panel 11 of the cavity close to the frame 14, and the reinforcing structure 112 is arranged parallel to the front panel 11 of the cavity. This setting can enable the reinforcing structure 112 and the front panel 11 of the cavity to cooperate to form a choke groove structure similar to a door assembly. When microwaves reach around the access opening 111, they will encounter reverse reflected waves, and the two will cancel each other out, thus presenting a very high impedance to effectively block the microwaves in the heating cavity 1 from escaping through the access opening 111.

[0036] Preferably, the minimum distance between the free end of the reinforcing structure 112 and the housing 14 or the upper cover plate 13 is 2-10 mm, the minimum distance between the reinforcing structure 112 and the front cavity plate 11 is 0.5-2 mm, and the reinforcing structure 112 is formed by bending 180° from a part of the front cavity plate 11 toward the housing 14 side. This setting effectively confines the microwave energy within the heating cavity 1 using the short-circuit and open-circuit characteristics, with less microwave leakage and high energy utilization efficiency.

[0037] As an example of the present invention, a recessed avoidance structure 113 is formed in a part of the front cavity plate 11, and the avoidance structure 113 is located at a lower position on the side of the access opening 111. This setting can reduce the inconvenience caused by the reduction in the size of the access opening 111, enabling the container for holding food to be smoothly placed in the heating cavity 1, facilitating the taking and placing operations.

[0038] Preferably, the avoidance structure 113 includes a first avoidance groove 1131 and a second avoidance groove 1132 extending in the vertical direction. The first avoidance groove 1131 and the second avoidance groove 1132 are located on both sides of the access opening 111 and at the same height. This setting can increase the maximum width of the access opening 111. When in use, containers such as plates can smoothly enter the heating cavity 1 through the avoidance structure 113; if the plate or other containers are too large, they can also smoothly enter by tilting one side through the avoidance structure 113, with stronger versatility.

[0039] As an example of the present invention, a first protruding portion 121 is formed by the rear cover 12 protruding toward the side away from the front cavity plate 11, and a second protruding portion 122 is formed by the first protruding portion 121 protruding further toward the side away from the front cavity plate 11. This setting can not only further increase the volume of the heating cavity 1, allowing bowls and other containers with a certain height to be placed in the heating cavity 1, but also cause a part of the rear cover 12 to protrude backward. When the microwave oven is embedded in the kitchen space, it is abutted against the rear side wall of the kitchen space through the second protruding portion 122 for positioning, ensuring that the fan assembly in the electrical cavity has a certain distance from the rear side wall of the kitchen space, with low operating resistance and good heat dissipation effect.

[0040] Preferably, a first avoidance portion 123 is provided at the lower part of the rear cover 12. The first avoidance portion 123 is arranged lower than the avoidance structure 113. A turntable assembly is provided in the heating cavity 1. The projection of the first avoidance portion 123 on the horizontal plane is a first arc, and the circle where the first arc is located is concentric with the circle where the turntable assembly is located. This setting can form an avoidance at the bottom position of the rear cover 12, facilitating the placement of containers such as discs into the heating cavity 1.

[0041] As an example of the present invention, the microwave oven further includes a door assembly 2 for blocking the access opening 111; a second avoidance portion 21 is provided at the lower part of the door assembly 2, and the projection of the second avoidance portion 21 on the horizontal plane is a second arc, and the second arc is located on the circle where the first arc is located. This setting enables the door assembly 2 to form an avoidance for containers such as discs, further increasing the practicability of the microwave oven; it can not only meet the daily cooking needs of a common family of three or a single person living alone, but also meet the use requirements for placing larger dinner plates and other containers in individual cases due to the first avoidance portion 123 provided on the rear cover 12 and the second avoidance portion 21 provided on the door assembly 2, with strong practicability.

[0042] The microwave oven of the present invention further includes a housing 3 and a control panel 4. The housing 3 is provided outside the heating cavity 1. An electrical cavity 9 is provided between the housing 3 and the second side plate 142 of the frame 14. Electrical components such as a magnetron 91 and a fan assembly 92 are installed in the electrical cavity. The control panel 4 is located on the side of the door assembly 2 close to the electrical cavity. The heating cavity 1 is provided in the housing 3. The specific structures and assembly relationships of the housing 3 and the control panel 4 are prior arts and will not be elaborated here.

[0043] Embodiment 3

[0044] As Figures 3-4 and Figure 11 shown, on the basis of Embodiment 2, the structures of the upper cover plate 13 and the frame 14 are improved in this embodiment. The space enclosed by the upper cover plate 13 and the frame 14 forms a heating cavity, and a grounding structure is provided at the connecting portion of the upper cover plate 13 and the frame 14. Specifically: A first extension edge 131 is provided at the side edge of the upper cover plate 13. The first extension edge 131 is set to extend in a direction away from the heating cavity 1. A first boss 132 protruding upward is provided on the first extension edge 131. A second extension edge 1421 is provided at the top of the second side plate 142 of the frame 14. A second concave platform 1422 is provided on the second extension edge 1421. The second concave platform 1422 is arranged opposite to the first boss 132. An accommodation cavity 134 is formed between the second concave platform 1422 and the first boss 132, and a grounding piece is installed inside the accommodation cavity 134. A first threaded hole 133 is provided on the first boss 132, and a second threaded hole 1423 is provided on the second concave platform 1422. The first threaded hole 133 and the second threaded hole 1423 are coaxially arranged. The fixed strength of the grounding piece is increased through the two threaded holes, preventing the grounding piece from slipping during the installation process and effectively strengthening the torque. The grounding piece is installed inside the accommodation cavity. During the installation process, the accommodation space restricts the sliding of the grounding piece, improving the assembly efficiency.

[0045] Moreover, in the prior art, powder spraying operation needs to be carried out on the upper cover plate. If the grounding piece is directly connected to the edge of the upper cover plate, the position of the grounding piece needs to be covered additionally during the powder spraying operation, and the operation is complex. In the improved solution, a semi-closed accommodation cavity is formed through the arrangement of the first boss and the second concave platform, which plays a role in accommodating and protecting the grounding piece. During the powder spraying process of the upper cover plate, the powder is not easy to enter the semi-closed space, preventing the powder spraying from polluting the grounding piece. There is no need to additionally shield the grounding structure during the powder spraying operation, and the operation is more convenient.

[0046] Further, the first extension edge 131 is arranged on the side of the upper cover plate 13 facing the electrical cavity. The first extension edge 131 is arranged to extend in a plane flush with the upper cover plate 13 in a direction away from the heating cavity, that is, the first extension edge 131 extends to the right. The first boss 132 can be formed by local stamping of the first extension edge 131.

[0047] The second extension edge 1421 is arranged at the top of the second side plate 142 and extends toward the side facing the electrical cavity. The plane where the second extension edge 1421 is located is parallel to the plane where the first extension edge 131 is located, so that the first extension edge 131 and the second extension edge 1421 are in contact, ensuring the heating cavity is tightly sealed. The second concave platform 1422 is arranged as a downward concave structure. The second concave platform 1422 can be formed by local stamping of the second extension edge 1421. Thus, an accommodation cavity is formed between the first boss 132 and the corresponding second concave platform 1422.

[0048] Preferably, both the first boss 132 and the second concave platform 1422 are arranged in two, and are both arranged at the position close to the middle on the corresponding extension edges, thereby forming two accommodation cavities 134, increasing the contact area between the grounding piece and the grounding structure, and improving the connection stability of the grounding piece.

[0049] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A grounding structure, comprising a frame (14) and an upper cover (13), wherein the frame (14) is configured as a U-shaped frame structure, the upper cover (13) is disposed on the top of the frame (14), and the space enclosed by the upper cover (13) and the frame (14) forms a heating chamber (1), characterized in that: A first extension edge (131) is arranged on the side edge of the upper cover plate (13), the first extension edge (131) being arranged to extend in a direction away from the heating chamber (1), a first boss (132) being arranged on the first extension edge (131), a second extension edge (1421) being arranged on the top of the frame body (14), a second recessed platform (1422) being arranged on the second extension edge (1421), the second recessed platform (1422) being arranged opposite to the first recessed platform (132), a receiving chamber (134) being formed between the second recessed platform (1422) and the first recessed platform (132), and a grounding plate being installed inside the receiving chamber (134).

2. The grounding structure according to claim 1, characterized in that: The first convex platform (132) is configured as an upwardly convex structure, and the second concave platform (1422) is configured as a downwardly concave structure.

3. The grounding structure according to claim 1, characterized in that: A first threaded hole (133) is provided on the first convex platform (132), and a second threaded hole (1423) is provided on the second concave platform (1422); the first threaded hole (133) and the second threaded hole (1423) are coaxially arranged.

4. The grounding structure according to claim 1, characterized in that: The first extension edge (131) is arranged on a side of the upper cover plate (13) facing the electrical cavity, and the first extension edge (131) is arranged to extend in a direction away from the heating cavity on a plane flush with the upper cover plate (13).

5. The grounding structure according to claim 1, characterized in that: The frame (14) comprises a cavity bottom plate (143), a first side plate (141) and a second side plate (142); the cavity bottom plate (143) is arranged horizontally, the first side plate (141) and the second side plate (142) are arranged vertically and in parallel, the second side plate (142) is arranged on a side close to the electrical cavity, and a second extension edge (1421) is arranged on the top of the second side plate (142).

6. The grounding structure according to claim 5, characterized in that: The second extension edge (1421) is arranged on the top of the second side plate (142) and extends towards a side facing the electrical cavity, and the plane where the second extension edge (1421) is located is parallel to and in contact with the plane where the first extension edge (131) is located.

7. The grounding structure according to claim 1, characterized in that: The number of the first convex platform (132) and the number of the second concave platform (1422) are both two.

8. The grounding structure according to claim 1, characterized in that: The first protrusion (132) is formed by local stamping of the first extension edge (131), and the second concave stage (1422) is formed by local stamping of the second extension edge (1421).

9. A microwave oven, characterized in that: The invention comprises a grounding structure as described in any one of claims 1 to 8.

10. The microwave oven according to claim 9, characterized in that It also comprises a heating chamber (1), a door assembly (2) and a shell (3), wherein the door assembly (2) is used to open or close the heating chamber (1), the shell (3) is arranged outside the heating chamber (1), and an electrical chamber (9) is arranged between the shell (3) and a second side plate (142) of the frame (14).

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