A door assembly and a control method for adaptive adjustment of its microwave shielding capability

Abstract

The application relates to a door assembly and a control method for adaptively adjusting the microwave shielding capability of the door assembly, which comprises a door body, a magnetic field generating element, a plurality of magnetic guides, a current control element and a magnetic fluid. The door body has a window and a light-transmitting interlayer covering the window. The magnetic guides are arranged at intervals around the window and are magnetically connected to the magnetic field generating element to form a plurality of magnetic field concentration areas and a plurality of magnetic field divergence areas at the window. The current control element is electrically connected to the magnetic field generating element to adjust the current of the magnetic field generating element and change the size of the magnetic field concentration areas. The magnetic fluid is arranged in the light-transmitting interlayer and is used to induce the magnetic field of the magnetic field concentration areas to cover the magnetic field concentration areas. The application divides the magnetic field strength areas by using the magnetic fluid, fully utilizes the safety redundancy in the existing microwave shielding scheme, and improves the observability of the door assembly under the premise of ensuring safety.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a door assembly and a control method for adaptively adjusting its microwave shielding capability. Background Technology

[0002] Steam ovens typically use 2.4GHz microwaves to heat food. The doors of these ovens usually feature a metal mesh and a blocking groove structure to both suppress microwave leakage and facilitate user observation. Traditional steam oven doors generally use metal mesh plates with uniform apertures, a simple structure that is easy to manufacture. However, observing the oven cavity relies heavily on the light transmittance of the metal mesh, but the aperture size is limited by microwave leakage standards and cannot be increased significantly: typical regulations require that leakage at 5cm from the outer surface of the oven door must not exceed 5mW / cm². 2 Therefore, the mesh used for observation must have very small aperture and density, which also results in a limited field of view for the user and insufficient brightness of the observed image.

[0003] Existing technologies include increasing the mesh aperture through electromagnetic interference: This involves adding an electromagnetic interference device to the outside of the metal mesh. The increased aperture size is used to neutralize leaked microwaves with the interference electromagnetic waves generated by the device, similar to electromagnetic interference devices used in exam rooms. However, this type of interference device itself suffers from electromagnetic leakage; even if it meets microwave leakage standards, it fails to meet electromagnetic leakage standards and can interfere with other electronic devices. Another method utilizes the principle of visual persistence to vibrate the metal mesh at high frequency, improving the user's viewing experience without changing the aperture. However, the image created by visual persistence is blurry, resulting in a poor viewing experience. Summary of the Invention

[0004] Therefore, it is necessary to provide a control method for adaptively adjusting the door assembly and its microwave shielding capability to address the conflict between safety and visibility at the observation window in existing microwave cooking devices.

[0005] The present invention provides a door assembly comprising: a door body, a magnetic field generating element, multiple magnetic conductors, a current control element, and a magnetic fluid. The door body has a window and a light-transmitting interlayer covering the window. The multiple magnetic conductors are arranged at intervals around the window. The magnetic conductors are magnetically connected to the magnetic field generating element to form multiple magnetic field concentration areas and multiple magnetic field divergence areas in the window. The current control element is electrically connected to the magnetic field generating element to adjust the current of the magnetic field generating element to change the size of the magnetic field concentration areas. The magnetic fluid is placed in the light-transmitting interlayer and is used to sense the magnetic field of the magnetic field concentration areas to cover the magnetic field concentration areas.

[0006] The aforementioned door assembly generates multiple magnetic field concentration areas and multiple magnetic field divergence areas in the window of the door body through a magnetic field generating element and multiple magnetic inductors. Then, a magnetic fluid is used to express the concentration of the magnetic field concentration areas at the window. By utilizing the shielding ability of the magnetic fluid against microwaves, a microwave physical shielding layer is constructed at the window, which meets the microwave shielding function requirements of microwave cooking devices. Since microwaves have the characteristic of attenuation when propagating in air, the existing fixed-aperture metal mesh microwave shielding scheme has a large amount of safety redundancy. Based on this, in this application, the area of ​​the magnetic field concentration area and the area of ​​the magnetic field divergence area are related to the current magnitude of the current control element. That is, the shielding capability and visible area size of the microwave physical shielding layer can be adjusted and changed by controlling the current magnitude. Therefore, the scheme provided by this application, which has variable shielding capability and visible area size, can make full use of the above-mentioned safety redundancy and improve the visibility of the door assembly window while ensuring that the impact of leaked microwaves on the human body meets the microwave leakage standards.

[0007] In one embodiment, the door body includes a door frame and an outer panel, an inner panel, and a metal shielding mesh installed on the door frame. The metal shielding mesh is located between the outer panel and the inner panel, and the light-transmitting interlayer is located between the outer panel and the metal shielding mesh.

[0008] With this setup, the initial shielding effect of the metal shielding mesh can greatly reduce microwave leakage, which helps to reduce the density of the magnetic field concentration area at the window, reduces the design difficulty of the strong and weak magnetic field areas at the window, and allows for larger mesh apertures, which can improve the visibility of the window compared to existing metal mesh panels.

[0009] In one embodiment, the light-transmitting interlayer has a shielding area corresponding to the window and a storage area at least below the window, and the magnetic field generating element includes an excitation coil arranged around the shielding area for generating an excitation magnetic field perpendicular to the shielding area.

[0010] With this setup, the magnetorheological fluid is at least contained in the storage area below the window, so it does not affect the visibility of the window; the excitation magnetic field formed by the excitation coil surrounding the shielding area covers the entire window, which at least ensures that the magnetorheological fluid can cover the entire window when the current intensity is sufficient, thus preventing microwave leakage.

[0011] In one embodiment, the storage area is arranged around the shielding area, and the magnetic field generating element further includes a magnetic component disposed in the storage area, the magnetic component being used to generate a constant magnetic field perpendicular to the storage area.

[0012] With this setup, under the constant magnetic field of the magnetic components, the magnetofluid can overcome gravity and be arranged around the shielded area in the storage area. When the excitation coil is energized, the magnetofluid can flow from the periphery of the shielded area to the center, resulting in a short flow path, rapid response, and avoidance of blockage.

[0013] In one embodiment, the light-transmitting interlayer includes a shielding cavity located in the shielding area, a liquid storage cavity located in the storage area and arranged around the shielding cavity, and a plurality of reflux channels communicating with the liquid storage cavity and the shielding cavity and arranged at intervals around the shielding cavity.

[0014] This setup, by designing a return channel, further constrains the position and velocity of the magnetofluid flowing into the shielded area, which helps to achieve quantitative management of the magnetofluid and prevents a large amount of magnetofluid from flowing into the storage area and connecting with each other under tension, thus affecting the distinction between the magnetic field concentration area and the magnetic field divergence area.

[0015] In one embodiment, the return channel corresponds to the magnetic conductor arrangement.

[0016] With this configuration, the flow path of the magnetofluid is kept consistent with the guiding direction of the magnetic conductor. After entering the shielded area, the magnetofluid will flow along the guiding direction of the magnetic conductor. The magnetofluid flowing out of the multi-channel return channel will not merge at the edge of the shielded cavity due to deviation.

[0017] In one embodiment, the door assembly further includes a plurality of auxiliary magnetic elements fixed to the shielding area.

[0018] With this setup, the auxiliary magnetic permeable element can compensate for the lack of distinct zoning of magnetic field strength in the central part of the shielded area, increase the visible area of ​​the shielded area, and improve the observation of the window.

[0019] In one embodiment, the door assembly further includes a distance sensor communicatively connected to the current control element, the distance sensor being used to detect the distance between the door assembly and a human body.

[0020] With this setup, the distance sensor data provides the most direct basis for the current controller to adjust the current magnitude, which helps to achieve quantitative management of microwave shielding capabilities.

[0021] According to another aspect of this application, this application also provides a control method for adaptively adjusting the microwave shielding capability of a gate assembly, which is implemented using the aforementioned gate assembly.

[0022] In one embodiment, the control method for adaptively adjusting the microwave shielding capability of the gate assembly includes the following steps: Detect the distance between the door assembly and the human body; When the distance is greater than the first preset distance, the current of the excitation coil is adjusted to the first preset value so that the magnetofluid is located outside the window; When the distance is less than or equal to a first preset distance and greater than a second preset distance, the current of the excitation coil is adjusted to a second preset value greater than the first preset value, so as to guide part of the magnetofluid outside the window into the magnetic field concentration area inside the window; and, When the distance is less than or equal to the second preset distance, the current of the excitation coil is adjusted to a third preset value that is greater than the second preset value, so as to guide the remaining magnetofluid outside the window into the window and make the magnetofluid in each magnetic field concentration area connected.

[0023] The control method provided in this application uses the distance between the door component and the human body as the adjustment basis. When the distance between the human body and the door component changes, the size of the magnetic field concentration area is actively adjusted to change the range of the magnetofluid covering the window, thereby realizing the adaptive adjustment of the shielding capability of microwaves. This fully utilizes the safety redundancy in the microwave leakage prevention design of existing microwave cooking devices and improves the visibility of the window. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a front structural diagram of a gate component in one embodiment of this application.

[0026] Figure 2 for Figure 1 A schematic diagram of the rear structure of the door assembly shown.

[0027] Figure 3 for Figure 2 The door assembly shown is in cross-sectional view along the AA direction.

[0028] Figure 4 for Figure 3 A magnified view of the structure shown at point X.

[0029] Figure 5 for Figure 2 A partial structural diagram of the door assembly shown.

[0030] Figure 6 for Figure 5 A partial structural diagram of the door assembly shown.

[0031] Figure 7 for Figure 6A partial structural diagram of the door assembly shown.

[0032] Figure 8 A partial structural diagram of the gate component is provided in another embodiment of this application.

[0033] Figure label: 10. Door body; 101. Window; 102. Translucent interlayer; 1021. Shielding cavity; 1022. Liquid storage cavity; 1023. Return channel; 103. Shielding area; 104. Storage area; 11. Door frame; 12. Outer panel; 13. Inner panel; 14. Metal shielding mesh; 15. Transparent container; 16. Transparent decorative panel; 17. Door handle; 18. Adhesive block; 20. Magnetic field generating element; 21. Transparent substrate; 22. Excitation coil; 23. Magnetic component; 30. Magnetic permeability components; 40. Auxiliary magnetic permeability components; 50. Distance sensor; 60. Shielding ring. Detailed Implementation

[0034] 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.

[0035] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0036] 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.

[0037] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0039] Because existing microwave cooking devices have a conflict between observability and shielding capabilities, designing a metal mesh plate according to existing microwave leakage standards would sacrifice the light transmittance at the observation window 101. In actual use, the microwave cooking device would be close to a black box, affecting the user's actual cooking experience.

[0040] To address the aforementioned issues, this application provides a control method for adaptively adjusting the microwave shielding capability of a gate assembly.

[0041] like Figures 1 to 7 As shown, the door assembly provided in this application includes a door body 10, a magnetic field generating element 20, a plurality of magnetic conductors 30, a current control element, and a magnetic fluid. The door body 10 has a window 101 and a light-transmitting interlayer 102 covering the window 101. The plurality of magnetic conductors 30 are arranged at intervals around the window 101. The magnetic conductors 30 are magnetically connected to the magnetic field generating element 20 to form a plurality of magnetic field concentration areas and a plurality of magnetic field divergence areas in the window 101. The current control element is electrically connected to the magnetic field generating element 20 to adjust the current of the magnetic field generating element 20 to change the size of the magnetic field concentration area. The magnetic fluid is placed in the light-transmitting interlayer 102 and is used to sense the magnetic field of the magnetic field concentration area to cover the magnetic field concentration area.

[0042] Based on the structure of the aforementioned door assembly, the magnetic field generating element 20 provides an initial magnetic field. After introducing multiple magnetic conductors 30, the magnetic field of the window 101 is divided into a magnetic field concentration area and a magnetic field divergence area. At this time, the magnetic fluid in the light-transmitting interlayer 102 can be attracted and gathered by the magnetic field in the magnetic field concentration area, which can shield the leaked microwaves. The magnetic field divergence area has no magnetic fluid, which is equivalent to the visible area of ​​the window 101, thus allowing the user to observe the cooking status of the food behind the door.

[0043] According to the microwave radiation field model, microwave leakage power density can be estimated in engineering using the inverse square law: ; S0 represents the leakage value measured at 5 cm (the regulatory limit is 5 mW / cm). 2 ), where r is the distance from the microwave radiation source.

[0044] Based on the microwave radiation field model described above, microwave leakage values ​​at different distances can be calculated, as shown in Table 1 below.

[0045] Table 1

[0046] As shown in Table 1, when the user is 30cm to 50cm away from the door assembly of the microwave cooking device, microwave leakage naturally decreases by 10 to 100 times.

[0047] Considering the characteristic of microwaves attenuating as they propagate in air, traditional metal mesh microwave shielding schemes have a large amount of safety redundancy. In this application, the area of ​​the magnetic field concentration region and the area of ​​the magnetic field divergence region are related to the current magnitude of the current control element. The visible area of ​​window 101 is adjustable. Based on this, by increasing the area of ​​the visible area of ​​window 101, the user's observation needs can be met, and by decreasing the area of ​​the visible area of ​​window 101, the microwave leakage standard can be met. Compared with the traditional scheme with fixed aperture of metal mesh, the scheme with adjustable visible area of ​​window 101 in this application makes full use of the safety redundancy in the traditional scheme, taking into account both the needs of observability and safety.

[0048] like Figure 4 and Figure 5 As shown, the door assembly in this application also includes a metal shielding mesh 14. Specifically, the door body 10 includes a door frame 11 and an outer panel 12, an inner panel 13, and a metal shielding mesh 14 installed on the door frame 11. The metal shielding mesh 14 is located between the outer panel 12 and the inner panel 13, and a light-transmitting interlayer 102 is located between the outer panel 12 and the metal shielding mesh 14. The inner panel 13 and the metal shielding mesh 14 are connected by an adhesive block 18, specifically provided by a transparent container 15 disposed between the metal shielding mesh 14 and the outer panel 12. Since the magnetic fluid in the light-transmitting interlayer 102 has a certain shielding effect on microwaves under the action of a magnetic field, the aperture of the metal shielding mesh 14 in this application can be designed to be larger than that of traditional metal mesh plates, thereby improving observability while ensuring the safety of the door assembly. Correspondingly, since the metal shielding mesh 14 undertakes part of the microwave shielding function, the design difficulty of the magnetic field strength and weakness zone at the window 101 is also reduced, making it easier for the door assembly to pass microwave leakage standard certification.

[0049] like Figure 5 As shown, a shielding ring 60 is also provided around the metal shielding mesh 14. The shielding ring 60 has comb-like teeth for elastically abutting against the inner plate 13 to prevent microwave leakage from the gap between the inner plate 13 and the inner liner opening.

[0050] Optionally, in one embodiment of this application, the metal shielding mesh 14 performs the main microwave shielding function, ensuring that microwave leakage meets the requirements of microwave leakage standards at a certain distance from the door assembly, while also taking into account the need for observability at that distance. The magnetofluid and related magnetic field generating elements 20 and magnetic permeable elements 30 are mainly used to shield the microwaves leaked by the metal shielding mesh 14 within this distance, and can also eliminate the influence of leaked microwaves on the human body when the human body approaches the door assembly.

[0051] like Figure 8 As shown, optionally, the magnetic conductor 30 may be a comb-shaped magnetic conductor sheet, a multi-tooth magnetic pole head, or a circumferentially segmented magnetic pole, so that at least within a circle near the edge of the window 101, a uniformly distributed magnetic field strength and weakness point is formed, so that the magnetofluid is arranged in an array or in a fishing net shape in the window 101.

[0052] like Figure 6 As shown, in one embodiment, the light-transmitting interlayer 102 has a shielding region 103 corresponding to the window 101 and a storage region 104 located at least below the window 101. The magnetic field generating element 20 includes a transparent substrate 21 and an excitation coil 22 fixedly connected to the transparent substrate 21 and arranged around the shielding region 103. The excitation coil 22 is used to generate an excitation magnetic field perpendicular to the shielding region 103. The magnetofluid is at least housed in the storage region 104 below the window 101, so it does not affect the visibility of the window 101. The excitation magnetic field formed by the excitation coil 22 surrounding the shielding region 103 covers the entire window 101, which at least ensures that the magnetofluid can cover the entire window 101 when the current intensity is sufficient, thus preventing microwave leakage.

[0053] like Figure 6 As shown, Figure 6 for Figure 5The diagram shows a structure that conceals the shielding ring 60, door frame 11, metal shielding mesh 14, and adhesive block 18. Furthermore, to allow the magnetofluid to move freely within the window 101, the storage area 104 is arranged around the shielding area 103. The magnetic field generating element 20 also includes a magnetic component 23 located in the storage area 104. The magnetic component 23 generates a constant magnetic field perpendicular to the storage area 104. Under the constant magnetic field of the magnetic component 23, the magnetofluid overcomes gravity and surrounds the shielding area 103 within the storage area 104. When the excitation coil 22 is energized, the magnetofluid flows from the periphery of the shielding area 103 towards the center, resulting in a short flow path, rapid response, and avoidance of blockage. The magnetic component 23 can be an electromagnetic coil electrically connected to the current control element or a permanent magnet.

[0054] like Figure 4 As shown, specifically, the light-transmitting interlayer 102 includes a shielding cavity 1021 located in the shielding area 103, a liquid storage cavity 1022 located in the storage area 104 and arranged around the shielding cavity 1021, and multiple return channels 1023 connecting the liquid storage cavity 1022 and the shielding cavity 1021 and arranged at intervals around the shielding cavity 1021. By designing the return channels 1023 to further constrain the position and velocity of the magnetofluid flowing into the shielding area 103, it helps to achieve quantitative management of the magnetofluid and prevents a large amount of magnetofluid from flowing into the storage area 104 and connecting with each other under tension, affecting the distinction between the magnetic field concentration area and the magnetic field divergence area. Optionally, the return channels 1023 are arranged corresponding to the magnetic conductor 30. This design is to keep the flow path of the magnetofluid consistent with the guiding direction of the magnetic conductor 30. After entering the shielding area 103, the magnetofluid will flow along the guiding direction of the magnetic conductor 30. The magnetofluid flowing out of the multiple return channels 1023 will not merge at the edge of the shielding cavity 1021 due to deviation.

[0055] like Figure 8 As shown, considering that the magnetic conductors 30 arranged at intervals around the edge of the window 101 have a weak influence on the magnetic field in the central region of the window 101, the door assembly also includes a plurality of auxiliary magnetic conductors 40 fixed in the shielding area 103; the auxiliary magnetic conductors 40 can make up for the lack of obvious zoning of magnetic field strength in the central part of the shielding area 103, increase the visible area of ​​the shielding area 103, and improve the observation of the window 101.

[0056] like Figure 1 and Figure 3As shown, optionally, in one embodiment, the door assembly further includes a distance sensor 50 communicatively connected to the current control element. The distance sensor 50 is used to detect the distance between the door assembly and a human body. Specifically, the door body 10 also includes a transparent decorative panel 16 disposed on the side of the outer panel 12 opposite to the inner panel 13, and a door handle 17 fixed to the side of the transparent panel opposite to the outer panel 12. The distance sensor 50 is embedded in the door handle 17. The data from the distance sensor 50 provides the most direct basis for the current controller to adjust the current magnitude, which helps to achieve quantitative management of microwave shielding capability.

[0057] Optionally, in one embodiment, the light-transmitting interlayer 102 is further provided with a transparent filling liquid, which is immiscible with the magnetic fluid. For example, the magnetic fluid is an oil-based magnetic fluid, and the transparent filling liquid is distilled water; or, the magnetic fluid is a water-based magnetic fluid, and the transparent filling liquid is kerosene. When the magnetic fluid is an oil-based magnetic fluid, the storage area 104 of the light-transmitting interlayer 102 is at least located above the window 101.

[0058] Optionally, in one embodiment, the light-transmitting interlayer 102 is not filled with a filling fluid, and the magnetic fluid is an oil-based magnetic fluid. In other words, the light-transmitting interlayer 102 is a vacuum, and the oil-based magnetic fluid enters the shielding region 103 by means of capillary action between the light-transmitting interlayers 102 and the magnetic force of the magnetic field. In this embodiment, it is preferable to add a magnetic element 23 to the storage region 104. When there is no current in the magnetic field generating element 20, the constant magnetic field formed by the magnetic element 23 in the storage region 104 can prevent the magnetic fluid from entering the shielding region 103 under capillary action, ensuring the observability of the window 101.

[0059] Based on the structure of the aforementioned gate assembly, this application also provides a control method for adaptively adjusting the microwave shielding capability of the gate assembly, specifically including the following steps: Detect the distance between the door assembly and the human body; When the distance is greater than the first preset distance (optional 1m), the current of the excitation coil 22 is adjusted to the first preset value (optional 0A) so that the magnetic fluid is located outside the window 101. When the shielding area 103 is not equipped with the magnetic element 23, the magnetic fluid stays in the storage area 104 below the window 101 under the action of gravity. When the shielding area 103 is equipped with the magnetic element 23, the magnetic fluid stays in the storage area 104 around the window 101 under the second magnetic field formed by the magnetic element 23, and is specifically stored in the liquid storage cavity 1022. The window 101 is completely transparent and the user can observe without obstruction. When the distance is less than or equal to the first preset distance and greater than the second preset distance (optionally 0.5m), the current of the excitation coil 22 is adjusted to the second preset value, which is greater than the first preset value, so as to guide part of the magnetofluid outside the window 101 into the magnetic field concentration area inside the window 101. At this time, the magnetofluid presents a discontinuous shielding structure that is separated from each other in the window 101; and, When the distance is less than or equal to the second preset distance, the current of the excitation coil 22 is adjusted to a third preset value that is greater than the second preset value, so as to guide the remaining magnetic fluid outside the window 101 into the window 101 and make the magnetic fluid in each magnetic field concentration area connected. At this time, the magnetic fluid presents a continuous shielding structure covering the entire observation area of ​​the window 101.

[0060] Actual measurements show that semi-coverage to full-coverage magnetohydrodynamic shielding can improve inductive loss by 10dB~20dB, ensuring that microwave leakage does not exceed the limit. Furthermore, the aperture of the metal shielding mesh 14 can be increased by 20%~40%, significantly enhancing visibility.

[0061] The control method provided in this application adjusts based on the distance between the door assembly and the human body. When the distance between the human body and the door assembly changes, the size of the magnetic field concentration area is actively adjusted to change the range of the magnetofluid covering the window 101, thereby achieving adaptive adjustment of the microwave shielding capability. This fully utilizes the safety redundancy in the microwave leakage prevention design of existing microwave cooking devices and improves the visibility of the window 101. Furthermore, this application guides the user away from the microwave cooking device by controlling the change in the visible area of ​​the window 101, minimizing the impact of microwaves on the human body. When the user is close to the door assembly, they can intuitively feel the adaptive enhancement effect of the door assembly's shielding capability.

[0062] It is understood that the above control method provides three preset distance values ​​as examples only. In actual design, four or more preset distance values ​​can also be designed, and the current preset values ​​are also multiple, thus forming a continuous adjustment, thereby better interpreting the invention purpose of adaptive adjustment of microwave shielding capability in this application.

[0063] The door assembly 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 current control element of the door assembly to perform corresponding operations, thereby realizing intelligent control of the door assembly 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 merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, 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 all fall within the protection scope of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A door assembly, characterized in that, include: The door body (10) has a window (101) and a light-transmitting interlayer (102) covering the window (101). Magnetic field generating element (20); Multiple magnetic inductors (30) are arranged at intervals around the window (101), and the magnetic inductors (30) are magnetically connected to the magnetic field generating element (20) to form multiple magnetic field concentration areas and multiple magnetic field divergence areas in the window (101); A current control element, electrically connected to the magnetic field generating element (20), is used to adjust the current of the magnetic field generating element (20) to change the size of the magnetic field concentration area; A magnetic fluid is placed inside the light-transmitting interlayer (102) to sense the magnetic field of the magnetic field concentration area and cover the magnetic field concentration area.

2. The door assembly according to claim 1, characterized in that, The door body (10) includes a door frame (11), an outer panel (12) installed on the door frame (11), an inner panel (13) and a metal shielding mesh (14) located between the outer panel (12) and the inner panel (13), and the light-transmitting interlayer (102) is located between the outer panel (12) and the metal shielding mesh (14).

3. The door assembly according to claim 1, characterized in that, The light-transmitting interlayer (102) has a shielding area (103) corresponding to the window (101) and a storage area (104) located at least below the window (101). The magnetic field generating element (20) includes an excitation coil (22) arranged around the shielding area (103) for generating an excitation magnetic field perpendicular to the shielding area (103).

4. The door assembly according to claim 3, characterized in that, The storage area (104) is arranged around the shielding area (103), and the magnetic field generating element (20) further includes a magnetic element (23) disposed in the storage area (104), the magnetic element (23) being used to generate a constant magnetic field perpendicular to the storage area (104).

5. The door assembly according to claim 4, characterized in that, The light-transmitting interlayer (102) includes a shielding cavity (1021) located in the shielding area (103), a liquid storage cavity (1022) located in the storage area (104) and arranged around the shielding cavity (1021), and a plurality of return channels (1023) communicating with the liquid storage cavity (1022) and the shielding cavity (1021) and arranged at intervals around the shielding cavity (1021).

6. The door assembly according to claim 5, characterized in that, The return channel (1023) is arranged corresponding to the magnetic conductor (30).

7. The door assembly according to claim 4, characterized in that, The door assembly also includes a plurality of auxiliary magnetic elements (40) fixed to the shielding area (103).

8. The door assembly according to claim 1, characterized in that, The door assembly also includes a distance sensor (50) communicatively connected to the current control element, the distance sensor (50) being used to detect the distance between the door assembly and a human body.

9. A control method for adaptively adjusting the microwave shielding capability of a gate assembly, characterized in that, It is implemented using the door assembly as described in any one of claims 1 to 8.

10. The control method according to claim 9, characterized in that, Includes the following steps: Detect the distance between the door assembly and the human body; When the distance is greater than the first preset distance, the current of the excitation coil (22) is adjusted to the first preset value so that the magnetofluid is located outside the window (101); When the distance is less than or equal to the first preset distance and greater than the second preset distance, the current of the excitation coil (22) is adjusted to the second preset value which is greater than the first preset value, so as to guide part of the magnetofluid outside the window (101) into the magnetic field concentration area inside the window (101); as well as When the distance is less than or equal to the second preset distance, the current of the excitation coil (22) is adjusted to a third preset value that is greater than the second preset value, so as to guide the remaining magnetic fluid outside the window (101) into the window (101) and make the magnetic fluid of each magnetic field concentration area connected.

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