Door body structure, microwave cooking equipment and microwave shielding regulation and control method

Abstract

The invention relates to a door body structure, microwave cooking equipment and a microwave shielding regulation and control method, which can realize dynamic balance among microwave shielding property, furnace chamber visibility and safety and improve the use experience of a user. The door body structure comprises: a door main body having an observation window; the first metal screen plate is fixedly arranged on the door main body and covers the observation window; the second metal screen plate is stacked on the first metal screen plate at intervals, and meshes of the second metal screen plate and meshes of the first metal screen plate can be arranged in a staggered mode.

Description

Technical Field

[0001] This application relates to the field of home appliance technology, and in particular to a door structure, microwave cooking equipment, and microwave shielding control method. Background Technology

[0002] As people's living standards improve, microwave ovens, as kitchen appliances for cooking food, use microwave generators to produce microwaves of about 2.45 GHz to heat food. At the same time, existing microwave ovens usually suppress microwave leakage through a metal viewing mesh and blocking groove structure fixed on the oven door.

[0003] However, while metal observation mesh can reduce microwave leakage by limiting the mesh diameter to a certain proportion smaller than the wavelength and providing basic light transmittance, it must maintain a small aperture to meet microwave leakage standards. This results in low light transmittance of the observation window, leading to insufficient brightness and limited field of view for users, making it difficult for them to clearly observe the inside of the furnace cavity and causing poor visibility of the furnace cavity.

[0004] Furthermore, if the metal viewing mesh is to meet the requirements of oven cavity visibility, the mesh diameter must be increased, which will cause serious microwave leakage, especially when the user is close to the viewing window, which can easily cause harm to the user's health and does not meet the safety requirements of microwave ovens. Summary of the Invention

[0005] Therefore, it is necessary to address the issue that the metal viewing mesh used in existing microwave ovens cannot simultaneously meet the requirements of microwave leakage and oven cavity visibility. This application provides a door structure, a microwave cooking device, and a microwave shielding control method, which can achieve a dynamic balance between microwave shielding, oven cavity visibility, and safety, thereby improving the user experience.

[0006] According to one aspect of this application, some embodiments of this application provide a door structure, including: a door body having an observation window; a first metal mesh plate fixed to the door body and covering the observation window; and a second metal mesh plate, the second metal mesh plate being stacked on top of the first metal mesh plate at intervals, and the mesh openings of the second metal mesh plate being misaligned with the mesh openings of the first metal mesh plate.

[0007] In some embodiments of this application, the mesh diameter of the first metal mesh plate and / or the second metal mesh plate is between 0.9 mm and 1.5 mm.

[0008] In some embodiments of this application, the spacing between the first metal mesh plate and the second metal mesh plate is between 1 mm and 3 mm.

[0009] In some embodiments of this application, the second metal mesh plate is movably disposed on the door body so that the mesh misalignment between the second metal mesh plate and the first metal mesh plate can be adjusted by moving the second metal mesh plate.

[0010] In some embodiments of this application, the second metal mesh plate is slidably mounted on the door body.

[0011] In some embodiments of this application, the door body includes a frame, a choke toothed plate fixedly connected to the frame and providing the observation window, and a light-transmitting plate assembly fixedly disposed on the frame; the periphery of the first metal mesh plate is fixedly connected to the choke toothed plate, and the second metal mesh plate is slidably disposed on the choke toothed plate.

[0012] In some embodiments of this application, the door body further includes a guide slide fixed to the choke tooth plate and extending laterally; the second metal mesh plate is slidably inserted into the guide slide.

[0013] In some embodiments of this application, the second metal mesh plate is located outside the choke tooth plate; the light-transmitting plate assembly consists of an inner plate body inside the choke tooth plate, an outer plate body installed on the frame and spaced apart from the inner plate body, and a middle plate body installed on the frame and located between the second metal mesh plate and the outer plate body, forming a heat insulation cavity between the middle plate body and the outer plate body.

[0014] In some embodiments of this application, the door structure further includes a drive mechanism, which is installed on the door body and driven to the second metal mesh plate, so that the door structure can switch between observation mode, shielding mode and security mode.

[0015] In some embodiments of this application, the door structure further includes a distance sensor disposed on the door body and a controller electrically connected to the distance sensor and the drive mechanism; the distance sensor is used to sense the distance between a human body and the door body to obtain user distance information; the controller is used to control the drive mechanism to drive the second metal mesh plate to slide relative to the first metal mesh plate according to the user distance information.

[0016] According to another aspect of this application, one embodiment of this application further provides a microwave cooking device, including: a microwave oven body; and a door structure as described in any of the above claims, the door structure being rotatably disposed on the microwave oven body.

[0017] According to another aspect of this application, one embodiment of this application further provides a microwave shielding control method, including the steps of: Obtain user distance information; and based on the user distance information, adjust the mesh misalignment between the second metal mesh plate and the first metal mesh plate in the door structure accordingly, so that the mesh misalignment increases as the user distance decreases.

[0018] In some embodiments of this application, the step of adjusting the mesh misalignment between the second metal mesh plate and the first metal mesh plate in the door structure according to the user distance information, so that the mesh misalignment increases as the user distance decreases, includes the following steps: The system compares the user distance information with a first distance threshold and a second distance threshold. If the user distance information is greater than the first distance threshold, the system adjusts the mesh misalignment between the second and first metal mesh panels to zero, placing the door structure in observation mode. If the user distance information is less than the second distance threshold, the system adjusts the mesh misalignment between the second and first metal mesh panels to equal the mesh diameter, placing the door structure in safety mode. If the user distance information is greater than or equal to the second distance threshold and less than or equal to the first distance threshold, the system adjusts the mesh misalignment between the second and first metal mesh panels to equal the mesh radius, placing the door structure in shielding mode.

[0019] In one embodiment of this application, the microwave shielding control method further includes the step of: calculating the microwave leakage power density at different user distances using a microwave leakage estimation model, so as to evaluate the microwave leakage of the gate structure at different user distances.

[0020] In summary, the door structure of this application introduces a double-layer metal mesh plate with staggered mesh openings and maintains a gap between the double-layer metal mesh plates to form an air layer. This causes the microwaves inside the furnace cavity to deviate from their path when passing through the observation window, creating a zigzag path. That is, the microwaves need to pass through the first layer of mesh openings, the air layer, and the second layer of mesh openings in sequence. This prevents the microwaves from passing through the staggered mesh openings in a straight line and causes them to be reflected and absorbed multiple times between the double-layer metal mesh plates, thus forming a zigzag path shielding effect and enhancing the shielding capability.

[0021] Furthermore, when the door structure of this application increases the mesh misalignment by moving the second metal mesh plate, the microwave shielding performance of the door structure is further enhanced, which is beneficial to improving the overall safety performance of the equipment, especially meeting the safety requirements when the user approaches the door body. When the door structure of this application decreases the mesh misalignment by moving the second metal mesh plate, although the microwave shielding level of the door structure is reduced, the light transmittance of the door structure at the observation window is greatly increased, improving the visibility of the oven cavity of the microwave cooking equipment, so that the user can more clearly observe the food cooking effect inside the oven cavity, thereby achieving a dynamic balance between microwave shielding and oven cavity visibility. Attached Figure Description

[0022] Figure 1 This is a perspective view of a microwave cooking apparatus according to an embodiment of this application; Figure 2 A schematic diagram of the door structure in the microwave cooking apparatus according to the above embodiments of this application is shown; Figure 3 An exploded view of the door structure according to the above embodiments of this application is shown; Figure 4 A first cross-sectional schematic diagram of a door structure according to the above embodiments of this application is shown; Figure 5 A second cross-sectional schematic diagram of the door structure according to the above embodiments of this application is shown; Figure 6 This is a schematic flowchart of a microwave shielding control method according to an embodiment of this application; Figure 7 An example of the misalignment control step in the microwave shielding control method according to the above embodiments of this application is shown.

[0023] Explanation of key component symbols: 1. Door structure; 10. Door body; 100. Observation window; 11. Frame; 12. Choke plate; 13. Light-transmitting plate assembly; 131. Inner plate; 132. Outer plate; 133. Middle plate; 14. Guide slide; 15. Door handle; 20. First metal mesh plate; 30. Second metal mesh plate; 40. Drive mechanism; 50. Distance sensor; 2. Microwave oven body.

[0024] The above description of the main component symbols, together with the accompanying drawings and specific embodiments, provides a further detailed explanation of this application. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0026] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] Existing microwave oven doors either require a small aperture in the metal viewing mesh to meet microwave leakage standards, resulting in low light transmittance and poor oven cavity visibility; or they require a larger mesh diameter to meet oven cavity visibility requirements, leading to severe microwave leakage. This makes it difficult to balance microwave leakage and oven cavity visibility requirements with existing metal viewing meshes. Therefore, this application provides a door structure, a microwave cooking device, and a microwave shielding control method that achieves a dynamic balance between microwave shielding, oven cavity visibility, and safety, improving the user experience.

[0030] Specifically, see the attached document. Figure 1 As shown, one embodiment of this application provides a microwave cooking device, which may include a door structure 1 and a microwave oven body 2. The door structure 1 is rotatably disposed on the microwave oven body 2 to open or close the oven cavity opening of the microwave oven body 2.

[0031] More specifically, such as Figures 2 to 5 As shown, the door structure 1 may include a door body 10 with an observation window 100, a first metal mesh plate 20, and a second metal mesh plate 30. The first metal mesh plate 20 is fixed to the door body 10 and covers the observation window 100. The second metal mesh plate 30 is stacked on top of the first metal mesh plate 20 at intervals, and the mesh openings of the second metal mesh plate 30 are staggered with those of the first metal mesh plate 20.

[0032] In this way, the door structure 1 of this application introduces a double-layer metal mesh plate (i.e., the first metal mesh plate 20 and the second metal mesh plate 30) with staggered mesh arrangements, and maintains a gap between the double-layer metal mesh plates to form an air layer. This causes the path of microwaves inside the furnace cavity to change to a zigzag path when passing through the observation window 100. That is, the microwaves need to pass through the first layer of mesh, the air layer and the second layer of mesh in sequence. This prevents the microwaves from passing through the staggered mesh in a straight line and causes them to be reflected and absorbed multiple times between the double-layer metal mesh plates, so as to form a zigzag path shielding effect, which facilitates the enhancement of shielding capability.

[0033] It is worth noting that although the metal mesh used in existing microwave ovens must have its mesh diameter (i.e., aperture) strictly controlled between 0.8mm and 1.2mm to ensure microwave shielding safety, the double-layer metal mesh plate used in the door structure 1 of this application can still maintain good microwave shielding after the mesh diameter is enlarged due to the formation of a zigzag path shielding effect. At the same time, the door structure 1 of this application will also improve the observation brightness due to the enlarged mesh diameter, improving the visibility of the oven cavity, so that users can clearly observe the food cooking effect inside the oven cavity.

[0034] For example, such as Figure 4 As shown, the mesh diameter D of the first metal mesh plate 20 and / or the second metal mesh plate 30 can be between 0.9 mm and 1.5 mm, which increases the mesh diameter of the metal mesh plate of this application by about 20% compared with the mesh diameter of traditional metal observation mesh.

[0035] Optionally, such as Figure 4 As shown, the distance t between the first metal mesh plate 20 and the second metal mesh plate 30 is between 1 mm and 3 mm, which improves the microwave shielding performance of the door structure 1 by 20% to 60%, and at the same time, the observation brightness of the door structure 1 at the observation window 100 can be improved by about 44%.

[0036] According to the above embodiments of this application, as Figures 3 to 5 As shown, the second metal mesh plate 30 can be movably disposed on the door body 10 so that the mesh misalignment between the second metal mesh plate 30 and the first metal mesh plate 20 can be adjusted by moving the second metal mesh plate 30, thereby achieving a dynamic balance between microwave shielding and oven cavity visibility.

[0037] Thus, when the door structure 1 of this application increases the mesh misalignment by moving the second metal mesh plate 30, the microwave shielding performance of the door structure 1 is further enhanced, which is beneficial to improving the overall safety performance of the equipment, especially meeting the safety requirements when the user approaches the door body 10. Conversely, when the door structure 1 decreases the mesh misalignment by moving the second metal mesh plate 30, although the microwave shielding level of the door structure 1 is reduced, the light transmittance of the door structure 1 at the observation window 100 is significantly increased, improving the visibility of the microwave cooking equipment's cavity, allowing the user to more clearly observe the food cooking effect inside the cavity.

[0038] Optionally, such as Figures 3 to 5 As shown, the second metal mesh plate 30 is laterally slidable on the door body 10, allowing the second metal mesh plate 30 to move laterally relative to the first metal mesh plate 20 to adjust the mesh misalignment. It is understood that the lateral extension mentioned in this application can refer to extension along the width direction of the door body 10, such as... Figure 2 The left and right directions are shown; of course, in other examples of this application, the second metal mesh plate 30 can also slide longitudinally, or it can also slide tilted along other directions, as long as the mesh misalignment can be adjusted, which will not be elaborated here.

[0039] Optionally, such as Figures 2 to 4 As shown, the door body 10 includes a frame 11 hinged to the microwave oven body 2, a choke toothed plate 12 fixedly connected to the frame 11 and providing the observation window 100, and a light-transmitting plate assembly 13 fixedly mounted on the frame 11; the periphery of the first metal mesh plate 20 is fixedly connected to the choke toothed plate 12; and the second metal mesh plate 30 is slidably disposed on the choke toothed plate 12. It is understood that the tooth spacing in the choke toothed plate 12 mentioned in this application is typically equal to one-quarter wavelength of the microwave to form a blocking groove, thereby utilizing a high-impedance boundary to reduce microwave leakage.

[0040] Optionally, such as Figures 3 to 5 As shown, the main body 10 of the door also includes a guide slide 14 fixed to the choke tooth plate 12 and extending laterally; the second metal mesh plate 30 is slidably inserted into the guide slide 14 so as to slide laterally relative to the first metal mesh plate 20.

[0041] Preferably, such as Figure 3 and Figure 4 As shown, the second metal mesh plate 30 is located outside the choke tooth plate 12, such that the second metal mesh plate 30 is located on the side of the choke tooth plate 12 opposite to the microwave oven body 2.

[0042] Optionally, such as Figures 2 to 4As shown, the light-transmitting plate assembly 13 includes an inner plate 131 located inside the choke tooth plate 12 and an outer plate 132 installed on the frame 11 and spaced apart from the inner plate 131; the first metal mesh plate 20 and the second metal mesh plate 30 are both located between the inner plate 131 and the outer plate 132.

[0043] Preferably, such as Figure 3 and Figure 4 As shown, the light-transmitting plate assembly 13 may also include a middle plate 133 installed on the frame 11 and located between the second metal mesh plate 30 and the outer plate 132, and a heat insulation cavity is formed between the middle plate 133 and the outer plate 132, which helps to prevent heat from the furnace cavity from dissipating outward from the door structure 1.

[0044] It is worth noting that, such as Figures 2 to 4 As shown, the door body 10 mentioned in this application may also include a door handle 15 protruding from the outer panel 132 so that the user can manually open and close the door.

[0045] Furthermore, the second metal mesh plate 30 of this application can be moved manually or automatically.

[0046] For example, such as Figures 3 to 5 As shown, the door structure 1 of this application may further include a drive mechanism 40, which is installed on the door body 10 and driven to the second metal mesh plate 30, for driving the second metal mesh plate 30 to move laterally relative to the first metal mesh plate 20, so as to automatically adjust the mesh misalignment between the second metal mesh plate 30 and the first metal mesh plate 20.

[0047] Optionally, the drive mechanism 40 may be implemented as a linear motor, electric telescopic rod, pneumatic telescopic rod, or electric rocker arm, etc., whose output end is connected to the second metal mesh plate 30.

[0048] Optionally, the door structure 1 has at least an observation mode, a shielding mode, and a security mode.

[0049] When the door structure 1 is in observation mode, the mesh misalignment between the second metal mesh plate 30 and the first metal mesh plate 20 is zero; that is, the mesh openings of the second metal mesh plate 30 are completely aligned with the mesh openings of the first metal mesh plate 20, and their equivalent aperture is the diameter D of each mesh opening, so that the door structure 1 has the best observation brightness, so that the user can clearly see the cooking effect of the food in the oven cavity through the observation window 100 of the door structure 1; at this time, although the microwave shielding level of the door structure 1 is reduced, considering the natural attenuation law of microwaves, the range beyond one meter from the door structure 1 still meets the microwave leakage standard, that is, the user will not be affected by microwave radiation when observing from a distance of more than one meter.

[0050] When the door structure 1 is in shielding mode, the mesh misalignment between the second metal mesh plate 30 and the first metal mesh plate 20 is equal to the mesh radius; that is, the mesh of the second metal mesh plate 30 and the mesh of the first metal mesh plate 20 cover half of each other, and its equivalent aperture is the radius D / 2 of each mesh, which improves the microwave shielding performance of the door structure 1 by 10% to 20%, so that the range beyond half a meter from the door structure 1 meets the microwave leakage standard. That is, when users observe from a distance of half a meter to one meter, they will not be affected by microwave radiation and can still clearly see the cooking effect of the food in the oven cavity.

[0051] When the door structure 1 is in safe mode, the mesh misalignment between the second metal mesh plate 30 and the first metal mesh plate 20 is equal to the mesh diameter; that is, the mesh of the second metal mesh plate 30 completely blocks the mesh of the first metal mesh plate 20, and its equivalent aperture is zero, which maximizes the microwave shielding performance of the door structure 1. This ensures that the area within half a meter of the door structure 1 also meets the microwave leakage standard, meaning that users will not be affected by microwave radiation when operating the microwave cooking equipment (such as opening and closing the door, switching working modes, or setting various cooking parameters) within half a meter.

[0052] According to the above embodiments of this application, as Figures 2 to 4 As shown, the door structure 1 may also include a distance sensor 50 disposed on the door body 10 and a controller electrically connected to the distance sensor 50 and the drive mechanism 40; the distance sensor 50 is used to sense the distance between a human body and the door body 10 to obtain user distance information; the controller is used to control the drive mechanism 40 to drive the second metal mesh plate 30 to slide relative to the first metal mesh plate 20 according to the user distance information, so as to automatically control the door structure 1 to switch between observation mode, shielding mode and safety mode according to the user distance, so that the microwave shielding level of the microwave cooking equipment increases as the user approaches, and achieves a dynamic balance between visibility and safety.

[0053] Optionally, such as Figures 2 to 4 As shown, the distance sensor 50 is installed on the door handle 15, thereby reducing the ambient temperature of the distance sensor 50 by means of the door handle 15 protruding from the outer plate 132, so as to extend the service life of the distance sensor 50.

[0054] It is worth noting that the distance sensor 50 mentioned in this application may, but is not limited to, be implemented as a millimeter-wave human perception radar, such as a 24 GHz millimeter-wave radar or a 60 GHz millimeter-wave radar.

[0055] Furthermore, the controller mentioned in this application may, but is not limited to, be implemented as a Microcontroller Unit (MCU).

[0056] It is worth mentioning that, such as Figure 6 As shown, one embodiment of this application further provides a microwave shielding control method, which may include the following steps: S100: Obtain user distance information; S200: Based on the user distance information, adjust the mesh misalignment between the second metal mesh plate and the first metal mesh plate in the door structure accordingly, so that the mesh misalignment increases as the user distance decreases.

[0057] For example, in step S100 of the microwave shielding control method of this application: the distance between a human body and the door body can be sensed by a distance sensor set on the door body to obtain the user distance information.

[0058] Optionally, such as Figure 7 As shown, step S200 of the microwave shielding control method of this application includes the following steps: S210: Compare the user's distance information with the first distance threshold and the second distance threshold respectively; S220: In response to the user distance information being greater than the first distance threshold, adjust the mesh misalignment between the second metal mesh plate and the first metal mesh plate to be zero, so that the door structure is in observation mode; S230: In response to the user distance information being less than the second distance threshold, adjust the mesh misalignment between the second metal mesh plate and the first metal mesh plate to be equal to the mesh diameter, so that the door structure is in a safe mode; S240: In response to the user distance information being greater than or equal to the second distance threshold and less than or equal to the first distance threshold, the mesh misalignment between the second metal mesh plate and the first metal mesh plate is adjusted to be equal to the mesh radius, so that the door structure is in shielding mode.

[0059] For example, the first distance threshold mentioned in this application may be implemented as one meter, but is not limited to; the second distance threshold mentioned in this application may be implemented as half a meter, but is not limited to.

[0060] According to the above embodiments of this application, as Figure 6 As shown, the microwave shielding control method may further include the following steps: S300: The microwave leakage power density at different user distances is calculated using a microwave leakage estimation model to assess the microwave leakage of the gate structure at different user distances.

[0061] Optionally, the microwave leakage estimation model is implemented as follows: Where S(r) is the microwave leakage power density at a distance r from the gate structure; S0 is the microwave leakage power density at a distance 5 cm from the gate structure.

[0062] For example, with S0 = 5mW / cm 2 For example: when the distance from the door structure is r = 10cm, S(r) = 1.25mW / cm 2 When the distance from the door structure is r = 50cm, S(r) = 0.05mW / cm 2 When the distance from the door structure is r = 100cm, S(r) = 0.0125mW / cm 2 In order to ensure that the microwave leakage of the gate structure at different user distances is assessed, so that the microwave leakage of the gate structure at different distances meets industry standards.

[0063] It should be noted that the microwave cooking equipment of this application can be controlled by a voice module, which is equipped with a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the microwave cooking equipment to perform corresponding operations, thereby realizing intelligent control of the microwave cooking equipment and improving the user experience.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are quite specific and detailed. However, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A door structure, characterized in that, include: The main body of the door has an observation window; A first metal mesh panel is fixed to the door body and covers the observation window; as well as A second metal mesh plate is stacked on top of the first metal mesh plate at intervals, and the mesh openings of the second metal mesh plate are arranged in a staggered manner with those of the first metal mesh plate.

2. The door structure according to claim 1, characterized in that, The mesh diameter of the first metal mesh plate and / or the second metal mesh plate is between 0.9 mm and 1.5 mm.

3. The door structure according to claim 1, characterized in that, The spacing between the first metal mesh plate and the second metal mesh plate is between 1 mm and 3 mm.

4. The door structure according to any one of claims 1 to 3, characterized in that, The second metal mesh plate is movably disposed on the door body so that the mesh misalignment between the second metal mesh plate and the first metal mesh plate can be adjusted by moving the second metal mesh plate.

5. The door structure according to claim 4, characterized in that, The second metal mesh panel can be slidably installed on the door body.

6. The door structure according to claim 5, characterized in that, The door body includes a frame, a choke toothed plate fixedly connected to the frame and providing the observation window, and a light-transmitting plate assembly fixedly disposed on the frame; the periphery of the first metal mesh plate is fixedly connected to the choke toothed plate, and the second metal mesh plate is slidably disposed on the choke toothed plate.

7. The door structure according to claim 6, characterized in that, The door body also includes a guide slide fixed to the choke tooth plate and extending laterally; the second metal mesh plate is slidably inserted into the guide slide.

8. The door structure according to claim 6, characterized in that, The second metal mesh plate is located outside the choke tooth plate; the light-transmitting plate assembly consists of an inner plate body located inside the choke tooth plate, an outer plate body installed on the frame and spaced apart from the inner plate body, and a middle plate body installed on the frame and located between the second metal mesh plate and the outer plate body, forming a heat insulation cavity between the middle plate body and the outer plate body.

9. The door structure according to claim 4, characterized in that, The door structure also includes a drive mechanism, which is installed on the door body and driven by the second metal mesh plate, so that the door structure can switch between observation mode, shielding mode and security mode.

10. The door structure according to claim 9, characterized in that, The door structure also includes a distance sensor disposed on the door body and a controller electrically connected to the distance sensor and the drive mechanism; the distance sensor is used to sense the distance between a human body and the door body to obtain user distance information; the controller is used to control the drive mechanism to drive the second metal mesh plate to slide relative to the first metal mesh plate according to the user distance information.

11. A microwave cooking appliance, characterized in that, include: Microwave oven body; and The door structure as described in any one of claims 1 to 10, wherein the door structure is rotatably disposed on the microwave oven body.

12. A microwave shielding control method, characterized in that, Including the following steps: Obtain user distance information; Based on the user distance information, the mesh misalignment between the second metal mesh plate and the first metal mesh plate in the door structure is adjusted accordingly, so that the mesh misalignment increases as the user distance decreases.

13. The microwave shielding control method according to claim 12, characterized in that, The step of adjusting the mesh misalignment between the second and first metal mesh plates in the door structure according to the user distance information, so that the mesh misalignment increases as the user distance decreases, includes the following steps: Compare the user's distance information with the first distance threshold and the second distance threshold respectively; In response to the user distance information being greater than the first distance threshold, the mesh misalignment between the second metal mesh plate and the first metal mesh plate is adjusted to be zero, so that the door structure is in observation mode. In response to the user distance information being less than the second distance threshold, the mesh misalignment between the second metal mesh plate and the first metal mesh plate is adjusted to be equal to the mesh diameter, so that the door structure is in a safe mode. as well as In response to the user distance information being greater than or equal to the second distance threshold and less than or equal to the first distance threshold, the mesh misalignment between the second metal mesh plate and the first metal mesh plate is adjusted to be equal to the mesh radius, so that the door structure is in shielding mode.

14. The microwave shielding control method according to claim 12 or 13, characterized in that, It also includes the following steps: The microwave leakage power density at different user distances was calculated using a microwave leakage estimation model to assess the microwave leakage of the gate structure at different user distances.

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