A door body assembly and a cooking apparatus

Abstract

The utility model discloses a door body subassembly, apply to cooking equipment, including door body, the inner surface of door body has choke groove, and the choke groove has linear choke groove straight line section, arc type choke groove corner section, and the choke plate is formed choke structure with choke groove, and the outer periphery of choke plate has the linear choke straight line edge of corresponding choke groove straight line section and linear type, and the choke corner edge of corresponding choke groove corner section is formed by the two linear choke straight line edges of adjacent with it through the inward collection depth formation. The utility model discloses still has the cooking equipment of this door body subassembly. The utility model has the beneficial effect that can effectively reduce the microwave leakage of four corners, and make the microwave leakage amount in ideal range 0.4-1.2wm / cm 2 .

Description

Technical Field

[0001] This utility model relates to a door assembly and a cooking device, belonging to the technical field of kitchen appliances. Background Technology

[0002] Currently, cooking equipment such as steam ovens and microwave ovens have microwave cooking functions. For microwave functions, the shielding effect of the door is very important. If the shielding effect is not ideal, it will lead to the safety hazard of microwave leakage.

[0003] In existing technology, the door assembly of cooking equipment has choke grooves and choke plates on its inner surface to form a choke structure, which can shield microwaves inside the cooking equipment. Testing revealed that most choke structures have microwave leakage within the ideal range of 0.4-1.2 Wm / cm² at their four sides; however, the microwave leakage at their four corners is as high as 2.5-3.3 Wm / cm², far exceeding the ideal range of 0.4-1.2 Wm / cm². Utility Model Content

[0004] The purpose of this invention is to provide a door assembly and cooking equipment that can effectively reduce microwave leakage at the four corners and keep the microwave leakage within the ideal range of 0.4-1.2 wm / cm2.

[0005] This utility model is achieved through the following technical solution.

[0006] A door assembly for use in a cooking device includes a door body, wherein the inner surface of the door body has a choke groove formed and recessed along its edge, the choke groove having two opposing and straight choke groove segments and an arc-shaped choke groove corner segment connecting two adjacent straight choke groove segments;

[0007] And a choke plate, the choke plate being fixed to the inner surface of the door body of the portion surrounded by the choke groove, the outer periphery of the choke plate and the outer edge of the choke groove having a gap, such that the choke plate blocks part of the choke groove and forms a choke structure with the choke groove;

[0008] The outer periphery of the choke plate has a straight choke edge corresponding to the straight segment of the choke groove and a choke corner edge corresponding to the corner segment of the choke groove. The choke corner edge is formed by the two adjacent straight choke edges through an inward depth.

[0009] As a further improvement of this utility model, the choke corner edge is configured as an arc-shaped, curved, or a combination of arc-shaped, curved, and straight-line deep resistance edge.

[0010] As a further improvement of this utility model, the choke corner edge includes a straight anti-leakage tangent edge, and the anti-leakage tangent edge and the two adjacent straight choke edges all have an included angle.

[0011] As a further improvement of this utility model, the included angle between the anti-leakage tangent edge and the two adjacent choke straight edges is the same.

[0012] As a further improvement of this utility model, the choke corner edge includes two straight anti-leakage and stabilizing phase cooperative edges that have an included angle with each other, and each of the anti-leakage and stabilizing phase cooperative edges has an included angle with the two adjacent straight choke edges.

[0013] As a further improvement of this utility model, the two anti-leakage and stabilizing phase cooperative sides are symmetrically arranged about the center line of the choke corner side.

[0014] As a further improvement of this utility model, the angle between the anti-leakage and stable phase-cooperating edge and its corresponding choke straight edge is an obtuse angle, and the angle between the two anti-leakage and stable phase-cooperating edges is an obtuse angle.

[0015] As a further improvement of this utility model, the choke corner edge includes a straight anti-leakage stable tangential main edge and two straight field cutoff co-control edges located on both sides of the anti-leakage stable tangential main edge. Furthermore, the anti-leakage stable tangential main edge and the two field cutoff co-control edges all have an included angle, and the anti-leakage stable tangential main edge and the two adjacent choke straight edges all have an included angle.

[0016] As a further improvement of this utility model, the included angle between the anti-leakage stable tangent main side and the two adjacent choke straight sides is the same, and the anti-leakage stable tangent main side and the two field cutoff co-control sides are symmetrically arranged about the center line of the choke corner side.

[0017] As a further improvement of this utility model, the field cutoff control edge and its corresponding choke straight edge are parallel.

[0018] As a further improvement of this utility model, the straight edge of the choke has a plurality of straight edge tooth grooves arranged at intervals to form a plurality of straight edge choke teeth; two straight edge tooth grooves adjacent to the choke corner edge form a corner choke tooth, and the two ends of the choke corner edge are respectively connected to the groove wall of the closest straight edge tooth groove.

[0019] As a further improvement of this utility model, the straight edge of the choke has a plurality of straight edge tooth grooves arranged at intervals to form a plurality of straight edge choke teeth; the corner edge of the choke has at least one corner edge tooth groove to form at least two corner choke teeth, and the two ends of the corner edge of the choke are respectively connected to the groove wall of the nearest straight edge tooth groove.

[0020] As a further improvement of this utility model, the corner edge tooth groove is set as one and located at the center line of the choke corner edge, or the corner edge tooth groove is set as at least two and arranged at equal intervals on the choke corner edge.

[0021] As a further improvement of this utility model, the groove depth of the corner edge tooth groove is less than the groove depth of the straight edge tooth groove.

[0022] A cooking appliance, including the door assembly.

[0023] The beneficial effects of this utility model are:

[0024] By using the choke corner edges formed by the inward depth, impedance continuity can be optimized to reduce reflection, the electromagnetic wave focusing effect can be weakened to optimize energy distribution, and the processing and assembly tolerance can be improved to enhance structural reliability. This effectively reduces microwave leakage, allowing the microwave leakage of the door assembly at the four corners to be reduced to the ideal range of 0.4-1.2 wm / cm2. Attached Figure Description

[0025] The preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings to help understand the purpose and advantages of this utility model, wherein:

[0026] Figure 1 This is a structural schematic diagram of the door assembly;

[0027] Figure 2 This is a cross-sectional schematic diagram of the choke structure;

[0028] Figure 3 This is a partial schematic diagram of the door assembly with respect to the choke corner edge;

[0029] Figure 4 A partial schematic diagram of the choke corner edge in some implementations of the door assembly of Case 1;

[0030] Figure 5 A partial schematic diagram of the choke corner edge in some other implementations of the door assembly of Case 1;

[0031] Figure 6 A partial schematic diagram of the door assembly with respect to the choke corner edge for implementing Case 2;

[0032] Figure 7 A partial schematic diagram of the door assembly with respect to the choke corner edge for implementing Case 3;

[0033] Figure 8 A partial schematic diagram of the door assembly with respect to the choke corner edge for implementing Case 4;

[0034] Figure 9 A partial schematic diagram of the door assembly for implementing Case 5 regarding the choke corner edge;

[0035] Figure 10 A partial schematic diagram of the door assembly with respect to the choke corner edge for implementing Case 6;

[0036] Figure 11 A partial schematic diagram of the door assembly in Case 7 regarding the choke corner edge;

[0037] Figure 12 A partial schematic diagram of the door assembly in Case 8 regarding the choke corner edge;

[0038] Figure 13 A partial schematic diagram of the door assembly for implementing Case 9 regarding the choke corner edge;

[0039] Figure 14 A partial schematic diagram of the door assembly in Case 10 regarding the choke corner edge;

[0040] Figure 15 A partial schematic diagram of the door assembly in Case 11 regarding the choke corner edge;

[0041] Figure 16 A partial schematic diagram of the door assembly for implementing Case 12 regarding the choke corner edge. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0043] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0044] The door assembly of this application embodiment is used in a cooking appliance to open or close the inner pot of the cooking appliance via a switch. (See also...) Figures 1-16The door assembly includes a door body 1, a choke plate 3, an outer door frame 11, and an outer glass panel 12. The door body 1 has an inner surface and an outer surface. The inner surface faces the inner liner, and the outer surface faces away from the inner liner. The outer door frame 11 is connected to the edge of the door body 1, and the outer glass panel 12 is fixed to the outer surface of the door body 1. The inner surface of the door body 1 has a choke groove 2, which is recessed along the edge of the door body 1, forming a rectangular closed structure. The choke groove 2 has four straight segments 21, which are straight lines, and any two adjacent straight segments 21 are perpendicular to each other. Any two adjacent straight segments 21 are connected by an arc-shaped corner segment 22.

[0045] The choke plate 3 is fixed to the inner surface of the door body 1 and is located within the portion of the inner surface enclosed by the choke groove 2. There is a gap between the outer periphery of the choke plate 3 and the outer edge of the choke groove 2, so that the choke plate 3 partially blocks the choke groove 2 and forms a choke structure with the choke groove 2.

[0046] The outer periphery of the choke plate 3 has a straight choke edge 31 corresponding to the straight segment 21 of the choke groove and a choke corner edge 32 corresponding to the corner segment 22 of the choke groove. The choke corner edge 32 is formed by the inward reduction of the depth of the two adjacent straight choke edges 31. In this embodiment, the choke corner edge 32 formed by the inward reduction of the depth is equivalent to the outer periphery formed by cutting off the outer periphery p at the four arc-shaped corners of the existing choke plate.

[0047] In the prior art, the microwave leakage of the door assembly is relatively high at the four corners of the corresponding choke groove 2 and choke plate 3, that is, the microwave leakage is high at the arc corners of the choke structure. The applicant's research has identified the following reasons for the high leakage:

[0048] I. Poor impedance continuity leads to standing wave effect due to superposition of reflected waves.

[0049] The electromagnetic shielding effectiveness of a choke is based on the 1 / 4 wavelength short-circuit transmission line theory. Its core principle is to achieve phase reversal cancellation of microwave energy through impedance matching. In existing technologies, the four corners of the choke and choke plate use large-radius curved edges, causing electromagnetic waves to experience a step-like impedance change at these corners. When microwaves propagate to these corners, the mismatch between the radius of curvature and the waveguide characteristic impedance causes drastic changes in the phase and amplitude of the electric field distribution, leading to interference between the reflected and incident waves. The reflected waves repeatedly reflect and superimpose in the four corner regions, forming standing wave resonances, causing energy to continuously accumulate and escape locally.

[0050] II. Electromagnetic focusing effect is formed by matching the curvature of the arc angle with the wavelength.

[0051] The existing design of the arc corners exhibits a specific proportional relationship between the radius of curvature and the operating frequency (e.g., close to λ / 4 or λ / 2), ensuring that microwaves satisfy the resonance condition at the four corners of the choke structure. At this point, constructive interference occurs at the edges of the arc corners, concentrating energy in the four corner regions of the choke structure and forming localized power density peaks. Simultaneously, the relatively long perimeter of the arc-shaped choke corner edges prolongs the microwave's residence time at the arc corners, further exacerbating the generation and feedback of harmonic components.

[0052] Third, the large tolerances in processing and assembly make it difficult to guarantee structural consistency.

[0053] In existing technologies, the large radius of curvature and long perimeter of the choke corner, which is arc-shaped, place extremely high demands on machining accuracy and assembly processes. Firstly, the large radius of curvature and long perimeter require high-precision CNC machine tools or special molds for forming, and even a tiny radius deviation (such as ±0.2mm) can lead to impedance mismatch. Secondly, the fitting of the door assembly with the inner pot of the cooking equipment requires complex tolerance compensation, and the large radius of curvature and long perimeter are prone to cumulative errors due to thermal deformation or mechanical stress, resulting in micron-level gaps.

[0054] In this embodiment, the choke corner edge 32 formed by the inward depth reduces the radius of curvature and perimeter of the choke corner edge 32, thereby improving the shielding effect against microwaves and reducing microwave leakage. Specifically, this is explained in detail in the following aspects:

[0055] 1. Optimize impedance continuity and reduce reflections

[0056] The choke corner edge 32 formed by the inward depth significantly shortens its perimeter while reducing its radius of curvature. This reduction in perimeter alters the propagation path length of the electromagnetic wave, creating a new matching relationship between the physical scale of the impedance transition region and the microwave wavelength. Existing rounded corners, due to their long perimeters, are equivalent to a multi-level impedance abrupt change structure, causing reflected waves to repeatedly superimpose at multiple corners. However, with the inward depth, the shortened perimeter makes the impedance transition path more compact, resulting in a steeper linear change in phase and amplitude. Furthermore, by controlling the geometric proportions of the transition region, the generation of high-frequency harmonics is suppressed.

[0057] II. Reduce electromagnetic wave focusing effect and optimize energy distribution

[0058] By reducing the depth of the choke corner edge 32, the perimeter of the choke is shortened, disrupting the original phase focusing mechanism of the arc corner for microwaves. In microwave propagation, existing technologies, where the edge perimeter is an integer multiple of the wavelength, tend to form standing wave resonant cavities, causing energy to concentrate at the four corners of the choke structure. However, by reducing the perimeter of the choke corner edge 32, the effective electrical length at the four corners is decoupled from the operating frequency, failing to meet the resonance condition. Furthermore, the reduced perimeter of the choke corner edge 32 makes the microwave propagation path at the four corners more direct, reducing second harmonics caused by multiple reflections at the edges.

[0059] III. Improve processing and assembly tolerances to enhance structural reliability

[0060] The inward-recessed depth process not only reduces the radius of curvature of the choke corner edge 32, but also simplifies the machining process by shortening the perimeter. In existing technologies, due to the long perimeter of the arc corner, the precision and motion trajectory control of the cutting tool are extremely important; even a small deviation in perimeter can lead to impedance mismatch or abnormal gaps. However, the shorter perimeter of the choke corner edge 32 after the inward-recessed depth process can significantly reduce the positioning error, making it controllable within ±0.1mm. In addition, during assembly, the fit is tighter and the gap distribution is more uniform, avoiding assembly misalignment or deformation caused by excessively long edges in certain areas.

[0061] Implementation Case 1:

[0062] In this embodiment, a door assembly has a choke corner edge 32 formed by two adjacent choke straight edges 31 through an inward depth.

[0063] In some implementations, such as Figure 4 As shown, the choke corner edge 32 is set as an arc-shaped deep anti-resistance edge 321a. Compared with the prior art, the arc-shaped deep anti-resistance edge 321a has a significantly reduced radius of curvature and circumference, thereby significantly improving its performance in three aspects: optimizing impedance continuity, weakening electromagnetic wave focusing effect, and improving processing and assembly tolerance. This enhances the shielding effect against microwaves and reduces microwave leakage at the four corners.

[0064] In other implementations, such as Figure 5 As shown, the choke corner edge 32 is configured as a curved, deep resistive edge 321a. Compared with the prior art, the curved, deep resistive edge 321a also has a significantly reduced radius of curvature and circumference to reduce microwave leakage at the four corners.

[0065] In other embodiments, the choke corner edge 32 is set as a deep resistive edge 321a that combines arc, curve and straight lines. Its principle and technical effect are the same as the two embodiments above, and will not be repeated here.

[0066] Implementation Case 2:

[0067] A door assembly, as shown Figure 6 In this embodiment, the choke corner edge 32 is formed by the inward depth of the two adjacent choke straight edges 31. The choke corner edge 32 includes a straight anti-leakage tangent edge 321b, and the anti-leakage tangent edge 321b and the two adjacent choke straight edges 31 all have an included angle.

[0068] In this implementation case, the choke corner edge 32, while achieving the technical effect brought about by the inward depth, further improves the technical effect in the following aspects based on its line type setting:

[0069] Impedance continuity optimization: The linear anti-leakage stabilizing tangent 321b ensures that the propagation path of the electromagnetic wave is consistent with the theoretical design, ensuring that the microwave forms a stable 180° phase reversal after experiencing a complete 1 / 4 wavelength path in the choke slot 2, that is, the cancellation effect can be maximized by stabilizing the phase.

[0070] Electric field concentration mitigation: The straight anti-leakage stable phase tangent edge 321b, through abrupt curvature change, makes the electric field present a uniform gradient distribution along the edge. The homogenized field strength characteristics reduce the local energy density and avoid the risk of dielectric breakdown caused by field strength concentration; at the same time, it reduces the distortion of electric field lines at the four corners, ensuring that the electric field energy is confined within the reflection path designed by the choke slot 2, rather than escaping through edge diffraction.

[0071] Reflection path correction: The straight anti-leakage and phase-stabilizing tangent edge 321b provides a flat reflection interface, which constrains the microwave reflection behavior to a specular reflection mode, ensuring the determinism of the reflected wave propagation path. This ensures that the reflected wave and the original leakage wave are strictly out of phase in space, suppressing the generation of diffraction waves and reducing the possibility of energy leakage through the diffraction path. By optimizing the consistency of the reflection path, the straight edge structure controls the reflection phase error well.

[0072] In terms of optimizing machining accuracy: the straight anti-leakage tangent edge 321b reduces machining complexity and further reduces manufacturing tolerance compared to the rounded edge.

[0073] In this embodiment, the anti-leakage tangent edge 321b can directly form the choke corner edge 32, or it can be connected to a transition edge or surplus edge of any line type at one or both ends to complete the integrity of the choke corner edge 32 in terms of line type. The arbitrary line type can be a straight line, an arc, a curve, etc.

[0074] In this embodiment, the angle between the anti-leakage tangent edge 321b and the two adjacent choke straight edges 31 is the same, that is, when the choke straight edges 31 are vertical and horizontal, the anti-leakage tangent edge 321b is inclined at 45°.

[0075] Implementation Case 3:

[0076] A door assembly, as shown Figure 7 In this embodiment, the choke corner edge 32 is formed by the inward depth of the two adjacent choke straight edges 31. The choke corner edge 32 includes two straight anti-leakage and stabilizing phase cooperative edges 321c that have an included angle with each other, and each anti-leakage and stabilizing phase cooperative edge 321c has an included angle with the two adjacent choke straight edges 31.

[0077] In this implementation case, the choke corner edge 32, while achieving the technical effect brought about by the inward depth, further improves the technical effect in the following aspects based on its line type setting:

[0078] Impedance continuity optimization: The two anti-leakage stable phase cooperative edge 321c effectively controls the impedance change gradient at the four corners through segmented geometric transition, so that the electromagnetic wave gradually adapts to the impedance change during transmission, maintains the boundary conditions of the 1 / 4 wavelength short-circuit transmission line theory, and avoids local impedance mismatch caused by the continuous curvature change of the arc edge.

[0079] Electric field concentration mitigation: The two anti-leakage stable phase cooperative edges 321c are decomposed into two linear extension directions, which disperses the electric field line density at the four corners. The included angle region formed by the two anti-leakage stable phase cooperative edges 321c makes the electric field energy uniformly distributed along the two edges, avoiding the phenomenon of high field strength convergence at the center of curvature of the arc edge. Therefore, the local electric field strength gradient is reduced, and the peak field strength is lower than the breakdown threshold of the gate material. At the same time, the formation of energy diffraction path caused by electric field line distortion is suppressed.

[0080] Reflection path correction: The two anti-leakage stable phase cooperative edges 321c optimize the microwave propagation path through a cooperative reflection mechanism. The straight boundary characteristics decompose the scattered wave caused by the arc edge into two controllable mirror reflections, which greatly reduces the phase error between the reflected wave and the original leakage wave. The bend structure formed between the two anti-leakage stable phase cooperative edges 321c reduces the cross-sectional area of ​​the diffraction path, weakens the intensity of the diffraction wave, and reduces the proportion of diffraction energy leakage to a negligible level.

[0081] In terms of optimizing machining accuracy: the two-section anti-leakage and stable phase synergistic edge 321c reduces machining complexity compared to the arc edge, and further reduces manufacturing tolerance.

[0082] In this embodiment, the two anti-leakage stable phase cooperative edges 321c can be connected and directly form the choke corner edge 32. Alternatively, a transition edge or redundant edge of any line type can be connected between the two anti-leakage stable phase cooperative edges 321c and at the outer end of the anti-leakage stable phase cooperative edges 321c to complete the integrity of the choke corner edge 32 in terms of line type. The arbitrary line type can be a straight line, an arc, a curve, etc.

[0083] In this embodiment, the two anti-leakage stable phase cooperative edges 321c are symmetrically arranged about the center line of the choke corner edge 32, and the angle between the anti-leakage stable phase cooperative edge 321c and its corresponding choke straight edge 31 is an obtuse angle.

[0084] Implementation Case 4:

[0085] A door assembly, as shown Figure 8 In this embodiment, the choke corner edge 32 is formed by the inward depth of the two adjacent choke straight edges 31. The choke corner edge 32 includes the anti-leakage stable tangent main edge 321d and two straight field cutoff co-control edges 322d located on both sides of the anti-leakage stable tangent main edge 321d. The anti-leakage stable tangent main edge 321d and the two field cutoff co-control edges 322d all have an included angle, and the anti-leakage stable tangent main edge 321d and the two adjacent choke straight edges 31 all have an included angle.

[0086] In this implementation case, the choke corner edge 32, while achieving the technical effect brought about by the inward depth, further improves the technical effect in the following aspects based on its line type setting:

[0087] Impedance continuity optimization: The anti-leakage stable tangent main edge 321d and the two field cutoff co-control edges 322d form a three-tangent structure, which reconstructs the waveguide cutoff conditions at the four corners, so that the electromagnetic wave propagation direction is orthogonally matched with the metal boundary. The anti-leakage stable tangent main edge 321d guides microwave propagation, and the field cutoff co-control edges 322d on both sides maintain the linear transition of the impedance gradient in the other two directions, respectively. This eliminates the lateral current component offset caused by geometric mismatch of the arc edge, and greatly improves the axial continuity of the equivalent transmission line impedance.

[0088] Electric field concentration mitigation: The three-sided structure decouples the annular electric field convergence region at the corner of the arc edge into three orthogonal field components through the discretized boundary constraint of the field cutoff co-control edge 322d. The anti-leakage stable tangent main edge 321d forces the electric field lines to decay uniformly, while the field cutoff co-control edge 322d blocks the diffusion of field strength in two directions. The synergistic effect of the three-sided structure significantly reduces the maximum field strength at the four corners compared to the arc edge, and improves the field distribution uniformity index. At the same time, the linear boundary effectively suppresses the distortion escape of electric field lines at the ends of the four corners, avoiding the risk of dielectric breakdown.

[0089] Reflection path correction: The anti-leakage stable tangential main edge 321d constrains the reflection behavior of the incident microwave to a directional reflection mode, while the field cutoff co-control edge 322d forms a phase synchronous superposition with the reflected wave of the main tangential edge through the reflection paths in the other two directions. The three-tangential structure greatly compresses the diffraction path length, thereby effectively reducing the proportion of residual leakage energy.

[0090] In terms of optimizing machining accuracy: the three-sided structure consisting of the anti-leakage stable tangent main edge 321d and the two field cutoff co-control edges 322d reduces machining complexity and further reduces manufacturing tolerance compared to the circular arc edge.

[0091] In this implementation, the anti-leakage stable tangent main edge 321d can be connected to the two field cutoff co-control edges 322d and directly form the choke corner edge 32. Alternatively, an arbitrary transition edge or redundant edge can be connected between the anti-leakage stable tangent main edge 321d and the field cutoff co-control edge 322d, or at the outer end of the field cutoff co-control edge 322d, to complete the integrity of the choke corner edge 32 in terms of line shape. The arbitrary line shape can be a straight line, an arc, a curve, etc.

[0092] In this embodiment, the angle between the anti-leakage tangent main edge 321d and the two adjacent choke straight edges 31 is the same. That is, when the choke straight edge 31 is vertical and horizontal, the anti-leakage tangent main edge 321d is inclined at 45°. Furthermore, the anti-leakage tangent main edge 321d and the two field cutoff control edges 322d are symmetrically arranged about the center line of the choke corner edge 32.

[0093] In this implementation case, the field cutoff control edge 322d and its corresponding choke straight edge 31 are parallel, that is, one field cutoff control edge 322d is a vertical edge and the other field cutoff control edge 322d is a horizontal edge.

[0094] Implementation Case 5:

[0095] A door assembly, as shown Figure 9 Based on Implementation Example 1, in this implementation example, the straight edge 31 of the choke has multiple straight edge grooves 31a arranged at intervals to form multiple straight edge choke teeth 31b. The corner edge 32 of the choke has no grooves; therefore, the two adjacent straight edge grooves 31a of the straight edge 31 and the corner edge 32 of the choke form a corner choke tooth 32b. Furthermore, both ends of the corner edge 32 are connected to the groove walls of its closest straight edge groove 31a, resulting in a recessed depth in the corner edge 32.

[0096] The straight-side choke tooth 31b extends the microwave propagation path through a periodic tooth groove structure. It generates multiple reflected waves by using the 1 / 4 wavelength resonance principle, forming an impedance abrupt change point on the straight side to reflect leakage energy. At the same time, the electric field gradient distribution between adjacent tooth grooves can suppress the propagation of transverse surface waves.

[0097] In this embodiment, since no toothed groove is provided on the choke corner edge 32, the adjacent straight line segments naturally extend and intersect to form a corner choke tooth 32b that is wider than the straight line choke tooth 31b. The corner choke tooth 32b disrupts the phase consistency of the microwave diffraction path, forcing diffracted waves with different incident angles to generate self-interference cancellation in the corner region.

[0098] Implementation Case 6:

[0099] A door assembly, as shown Figure 10 Based on Implementation Example 1, in this implementation example, the choke straight edge 31 has multiple straight edge grooves 31a arranged at intervals to form multiple straight edge choke teeth 31b. The choke corner edge 32 has at least one corner groove 32a to form at least two corner choke teeth 32b. Furthermore, both ends of the choke corner edge 32 are connected to the groove walls of their nearest straight edge grooves 31a, thereby forming an inward depth of the choke corner edge 32.

[0100] The difference between this embodiment and embodiment 3 is that the corner choke edge 32 in embodiment 3 does not have a corner choke tooth 32b, while in this embodiment, the corner choke tooth 32b has a corner edge tooth groove 32a.

[0101] In this embodiment, by setting corner edge grooves 32a on the choke corner edge 32 to form corner choke teeth 32b, the single diffraction path is divided into multiple resonant cavities through periodic impedance abrupt changes, forcing the microwave to undergo multiple phase reversals, causing the diffraction wave to self-interference cancel. At the same time, the corner edge grooves 32a disrupt the continuity of surface wave propagation, reduce microwave leakage and suppress the extension of the frequency band to higher frequencies.

[0102] In some implementations, the corner edge groove 32a is provided as one and is located at the center line of the choke corner edge 32.

[0103] In another embodiment, at least two corner edge grooves 32a are provided and are arranged at equal intervals on the choke corner edge 32.

[0104] In this embodiment, the groove depth of the corner edge tooth groove 32a is less than the groove depth of the straight edge tooth groove 31a. More specifically, the groove depth of the corner edge tooth groove 32a is 30%-70% of the groove depth of the straight edge tooth groove 31a. It should be noted that the groove depth refers to the length from the groove opening to the groove bottom, i.e., referring to... Figure 10 The length of d2 is less than that of d1.

[0105] Implementation Case 7:

[0106] A door assembly, as shown Figure 11Based on Implementation Example 2, in this implementation example, the straight edge 31 of the choke has multiple straight edge grooves 31a arranged at intervals to form multiple straight edge choke teeth 31b. The corner edge 32 of the choke does not have grooves; therefore, the two adjacent straight edge grooves 31a of the straight edge 31 and the corner edge 32 of the choke form a corner choke tooth 32b. Furthermore, both ends of the corner edge 32 are connected to the groove walls of their closest straight edge grooves 31a, resulting in a recessed depth in the corner edge 32.

[0107] The straight-side choke tooth 31b extends the microwave propagation path through a periodic tooth groove structure. It generates multiple reflected waves by using the 1 / 4 wavelength resonance principle, forming an impedance abrupt change point on the straight side to reflect leakage energy. At the same time, the electric field gradient distribution between adjacent tooth grooves can suppress the propagation of transverse surface waves.

[0108] In this embodiment, since no toothed groove is provided on the choke corner edge 32, the adjacent straight line segments naturally extend and intersect to form a corner choke tooth 32b that is wider than the straight line choke tooth 31b. The corner choke tooth 32b disrupts the phase consistency of the microwave diffraction path, forcing diffracted waves with different incident angles to generate self-interference cancellation in the corner region.

[0109] Implementation Case 8:

[0110] A door assembly, as shown Figure 12 Based on Implementation Example 2, in this implementation example, the choke straight edge 31 has multiple straight edge grooves 31a arranged at intervals to form multiple straight edge choke teeth 31b. The choke corner edge 32 has at least one corner groove 32a to form at least two corner choke teeth 32b. Furthermore, both ends of the choke corner edge 32 are connected to the groove walls of their nearest straight edge grooves 31a, resulting in an inward depth of the choke corner edge 32.

[0111] The difference between this embodiment and embodiment 3 is that the corner choke edge 32 in embodiment 3 does not have a corner choke tooth 32b, while in this embodiment, the corner choke tooth 32b has a corner edge tooth groove 32a.

[0112] In this embodiment, by setting corner edge grooves 32a on the choke corner edge 32 to form corner choke teeth 32b, the single diffraction path is divided into multiple resonant cavities through periodic impedance abrupt changes, forcing the microwave to undergo multiple phase reversals, causing the diffraction wave to self-interference cancel. At the same time, the corner edge grooves 32a disrupt the continuity of surface wave propagation, reduce microwave leakage and suppress the extension of the frequency band to higher frequencies.

[0113] In some implementations, the corner edge groove 32a is provided as one and is located at the center line of the choke corner edge 32.

[0114] In another embodiment, at least two corner edge grooves 32a are provided and are arranged at equal intervals on the choke corner edge 32.

[0115] In this embodiment, the groove depth of the corner edge tooth groove 32a is less than the groove depth of the straight edge tooth groove 31a. More specifically, the groove depth of the corner edge tooth groove 32a is 30%-70% of the groove depth of the straight edge tooth groove 31a. It should be noted that the groove depth refers to the length from the groove opening to the groove bottom, i.e., referring to... Figure 12 The length of d2 is less than that of d1.

[0116] Implementation Case 9:

[0117] A door assembly, as shown Figure 13 Based on Implementation Example 3, in this implementation example, the straight edge 31 of the choke has multiple straight edge grooves 31a arranged at intervals to form multiple straight edge choke teeth 31b. The corner edge 32 of the choke has no grooves; therefore, the two adjacent straight edge grooves 31a of the straight edge 31 and the corner edge 32 of the choke form a corner choke tooth 32b. Furthermore, both ends of the corner edge 32 are connected to the groove walls of their closest straight edge grooves 31a, resulting in a recessed depth in the corner edge 32.

[0118] The straight-side choke tooth 31b extends the microwave propagation path through a periodic tooth groove structure. It generates multiple reflected waves by using the 1 / 4 wavelength resonance principle, forming an impedance abrupt change point on the straight side to reflect leakage energy. At the same time, the electric field gradient distribution between adjacent tooth grooves can suppress the propagation of transverse surface waves.

[0119] In this embodiment, since no toothed groove is provided on the choke corner edge 32, the adjacent straight line segments naturally extend and intersect to form a corner choke tooth 32b that is wider than the straight line choke tooth 31b. The corner choke tooth 32b disrupts the phase consistency of the microwave diffraction path, forcing diffracted waves with different incident angles to generate self-interference cancellation in the corner region.

[0120] Implementation Case 10:

[0121] A door assembly, as shown Figure 14 Based on Implementation Example 3, in this implementation example, the choke straight edge 31 has multiple straight edge grooves 31a arranged at intervals to form multiple straight edge choke teeth 31b. The choke corner edge 32 has at least one corner groove 32a to form at least two corner choke teeth 32b. Furthermore, both ends of the choke corner edge 32 are connected to the groove walls of their nearest straight edge grooves 31a, thereby forming an inward depth of the choke corner edge 32.

[0122] The difference between this embodiment and embodiment 3 is that the corner choke edge 32 in embodiment 3 does not have a corner choke tooth 32b, while in this embodiment, the corner choke tooth 32b has a corner edge tooth groove 32a.

[0123] In this embodiment, by setting corner edge grooves 32a on the choke corner edge 32 to form corner choke teeth 32b, the single diffraction path is divided into multiple resonant cavities through periodic impedance abrupt changes, forcing the microwave to undergo multiple phase reversals, causing the diffraction wave to self-interference cancel. At the same time, the corner edge grooves 32a disrupt the continuity of surface wave propagation, reduce microwave leakage and suppress the extension of the frequency band to higher frequencies.

[0124] In some implementations, the corner edge groove 32a is provided as one and is located at the center line of the choke corner edge 32.

[0125] In another embodiment, at least two corner edge grooves 32a are provided and are arranged at equal intervals on the choke corner edge 32.

[0126] In this embodiment, the groove depth of the corner edge tooth groove 32a is less than the groove depth of the straight edge tooth groove 31a. More specifically, the groove depth of the corner edge tooth groove 32a is 30%-70% of the groove depth of the straight edge tooth groove 31a. It should be noted that the groove depth refers to the length from the groove opening to the groove bottom, i.e., referring to... Figure 14 The length of d2 is less than that of d1.

[0127] Implementation Case 11:

[0128] A door assembly, as shown Figure 15 Based on Implementation Example 4, in this implementation example, the straight edge 31 of the choke has multiple straight edge grooves 31a arranged at intervals to form multiple straight edge choke teeth 31b. The corner edge 32 of the choke does not have grooves; therefore, two straight edge grooves 31a adjacent to the corner edge 32 form a corner choke tooth 32b. Furthermore, both ends of the corner edge 32 are connected to the groove walls of their nearest straight edge grooves 31a, resulting in a recessed depth in the corner edge 32.

[0129] The straight-side choke tooth 31b extends the microwave propagation path through a periodic tooth groove structure. It generates multiple reflected waves by using the 1 / 4 wavelength resonance principle, forming an impedance abrupt change point on the straight side to reflect leakage energy. At the same time, the electric field gradient distribution between adjacent tooth grooves can suppress the propagation of transverse surface waves.

[0130] In this embodiment, since no toothed groove is provided on the choke corner edge 32, the adjacent straight line segments naturally extend and intersect to form a corner choke tooth 32b that is wider than the straight line choke tooth 31b. The corner choke tooth 32b disrupts the phase consistency of the microwave diffraction path, forcing diffracted waves with different incident angles to generate self-interference cancellation in the corner region.

[0131] Implementation Case 12:

[0132] A door assembly, as shown Figure 16 Based on Implementation Example 4, in this implementation example, the choke straight edge 31 has multiple straight edge grooves 31a arranged at intervals to form multiple straight edge choke teeth 31b. The choke corner edge 32 has at least one corner groove 32a to form at least two corner choke teeth 32b. Furthermore, both ends of the choke corner edge 32 are connected to the groove walls of their nearest straight edge grooves 31a, thereby forming an inward depth of the choke corner edge 32.

[0133] The difference between this embodiment and embodiment 3 is that the corner choke edge 32 in embodiment 3 does not have a corner choke tooth 32b, while in this embodiment, the corner choke tooth 32b has a corner edge tooth groove 32a.

[0134] In this embodiment, by setting corner edge grooves 32a on the choke corner edge 32 to form corner choke teeth 32b, the single diffraction path is divided into multiple resonant cavities through periodic impedance abrupt changes, forcing the microwave to undergo multiple phase reversals, causing the diffraction wave to self-interference cancel. At the same time, the corner edge grooves 32a disrupt the continuity of surface wave propagation, reduce microwave leakage and suppress the extension of the frequency band to higher frequencies.

[0135] In some implementations, the corner edge groove 32a is provided as one and is located at the center line of the choke corner edge 32.

[0136] In another embodiment, at least two corner edge grooves 32a are provided and are arranged at equal intervals on the choke corner edge 32.

[0137] In this embodiment, the groove depth of the corner edge tooth groove 32a is less than the groove depth of the straight edge tooth groove 31a. More specifically, the groove depth of the corner edge tooth groove 32a is 30%-70% of the groove depth of the straight edge tooth groove 31a. It should be noted that the groove depth refers to the length from the groove opening to the groove bottom, i.e., referring to... Figure 16 The length of d2 is less than that of d1.

[0138] Implementation Case 13:

[0139] A cooking appliance includes a door assembly, as shown in Embodiments 1-12. The cooking appliance includes a steam oven and a microwave oven.

[0140] Experimental Case:

[0141] Aluminum foil was used to seal the gaps between the four straight edges of the door assembly and the inner pot of the cooking equipment, leaving only gaps between the four corner edges of the door assembly and the inner pot. The four corner edges of the door assembly were labeled as position 1, position 2, position 3, and position 4, corresponding to the arc corners of the choke structure. Then, the microwave leakage at positions 1, 2, 3, and 4 was measured. Since the gaps at the straight edges were sealed with aluminum foil, the microwave leakage at the straight edges could be effectively prevented from interfering with the four corner edges, thus ensuring the validity of the test.

[0142] The tests were conducted on Implementation Case 3 and Implementation Case 4 respectively, and the results are as follows:

[0143] Microwave leakage detection results for Case 5:

[0144] First set of data

[0145]

[0146] Second set of data

[0147]

[0148] Third set of data

[0149]

[0150] As can be seen, the microwave leakage in Implementation Case 5 decreased from the range of 2.5-3.3 wm / cm2 to the range of 0.4-1.2 wm / cm2.

[0151] Microwave leakage detection results of Case 6:

[0152] First set of data

[0153]

[0154] Second set of data

[0155]

[0156] Third set of data

[0157]

[0158] As can be seen, the microwave leakage in Implementation Case 6 decreased from the range of 2.5-3.3 wm / cm2 to the range of 0.4-1.2 wm / cm2.

[0159] Microwave leakage detection results for Case 7:

[0160] First set of data

[0161]

[0162] Second set of data

[0163]

[0164] Third set of data

[0165]

[0166] As can be seen, the microwave leakage in Implementation Case 7 decreased from the range of 2.5-3.3 wm / cm2 to the range of 0.4-1.2 wm / cm2.

[0167] Microwave leakage detection results for Case 8:

[0168] First set of data

[0169]

[0170] Second set of data

[0171]

[0172] Third set of data

[0173]

[0174] As can be seen, the microwave leakage in Implementation Case 8 decreased from the range of 2.5-3.3 wm / cm2 to the range of 0.4-1.2 wm / cm2.

[0175] Microwave leakage detection results for Case 9:

[0176] First set of data

[0177]

[0178] Second set of data

[0179]

[0180]

[0181] Third set of data

[0182]

[0183] As can be seen, the microwave leakage in Implementation Case 9 decreased from the range of 2.5-3.3 wm / cm2 to the range of 0.4-1.2 wm / cm2.

[0184] Microwave leakage detection results for Case 10:

[0185] First set of data

[0186]

[0187] Second set of data

[0188]

[0189] Third set of data

[0190]

[0191] As can be seen, the microwave leakage in Implementation Case 10 decreased from the range of 2.5-3.3 wm / cm2 to the range of 0.4-1.2 wm / cm2.

[0192] Microwave leakage detection results for Case 11:

[0193] First set of data

[0194]

[0195] Second set of data

[0196]

[0197] Third set of data

[0198]

[0199] As can be seen, the microwave leakage in Implementation Case 11 decreased from the range of 2.5-3.3 wm / cm2 to the range of 0.4-1.2 wm / cm2.

[0200] Microwave leakage detection results for Case 12:

[0201] First set of data

[0202]

[0203] Second set of data

[0204]

[0205]

[0206] Third set of data

[0207]

[0208] As can be seen, the microwave leakage in Implementation Case 12 decreased from the range of 2.5-3.3 wm / cm2 to the range of 0.4-1.2 wm / cm2.

[0209] It should be noted that the leakage rates at positions 3 and 4 are generally higher than those at positions 1 and 2. The applicant's research revealed the following reasons for this result:

[0210] Since the experimental materials were not final commercial products, the manufacturing and processing requirements were lower than those for commercial products. The door components had varying degrees of concavity and convexity, resulting in less than ideal flatness. Furthermore, there were differences in hinge force and installation force deviations during assembly, ultimately leading to different gaps between the door components and the front panel of the inner liner. In addition, the projection lengths of the top and bottom edges of the door components on the front panel of the inner liner were inconsistent. Generally, the projection length of the top edge of the door component on the front panel of the inner liner was greater than that of the bottom edge. Therefore, the microwave leakage at points 1 and 2 was less than that at points 3 and 4, rather than a defect in the technical solution.

[0211] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A door assembly for use in cooking equipment, characterized in that, Includes a door body (1), the inner surface of which has a choke groove (2) formed by recessing along its edge, the choke groove (2) having four straight segments (21), the four straight segments (21) being straight and any two adjacent straight segments (21) being perpendicular to each other, and any two adjacent straight segments (21) being connected by an arc-shaped corner segment (22). And a choke plate (3), which is fixed on the inner surface of the door body (1) and located within the portion enclosed by the choke groove (2); there is a gap between the outer periphery of the choke plate (3) and the outer edge of the choke groove (2), so that the choke plate (3) blocks part of the choke groove (2) and forms a choke structure with the choke groove (2); The outer periphery of the choke plate (3) has a straight choke edge (31) corresponding to the straight section (21) of the choke groove and a choke corner edge (32) corresponding to the corner section (22) of the choke groove. The choke corner edge (32) is formed by the two adjacent straight choke edges (31) through an inward depth.

2. The door assembly according to claim 1, characterized in that, The choke corner edge (32) is configured as an arc-shaped, curved, or a combination of arc-shaped, curved, and straight-line deep resistive edge (321a).

3. The door assembly according to claim 1, characterized in that, The choke corner edge (32) includes a straight anti-leakage tangent edge (321b), and the anti-leakage tangent edge (321b) and the two adjacent choke straight edges (31) all have an included angle.

4. The door assembly according to claim 3, characterized in that, The included angle between the anti-leakage stable tangent edge (321b) and the two adjacent choke straight edges (31) is the same.

5. The door assembly according to claim 1, characterized in that, The choke corner edge (32) includes two straight anti-leakage and stabilizing phase cooperative edges (321c) that are angled to each other, and each of the anti-leakage and stabilizing phase cooperative edges (321c) and the two adjacent choke straight edges (31) are angled to each other.

6. The door assembly according to claim 5, characterized in that, The two anti-leakage stable phase cooperative sides (321c) are symmetrically arranged about the center line of the choke corner side (32).

7. The door assembly according to claim 6, characterized in that, The angle between the anti-leakage stable phase cooperative edge (321c) and its corresponding choke straight edge (31) is an obtuse angle, and the angle between the two anti-leakage stable phase cooperative edges (321c) is an obtuse angle.

8. The door assembly according to claim 1, characterized in that, The choke corner edge (32) includes a straight anti-leakage stable tangent main edge (321d) and two straight field cutoff co-control edges (322d) located on both sides of the anti-leakage stable tangent main edge (321d). The anti-leakage stable tangent main edge (321d) and the two field cutoff co-control edges (322d) all have an included angle, and the anti-leakage stable tangent main edge (321d) and the two adjacent choke straight edges (31) all have an included angle.

9. The door assembly according to claim 8, characterized in that, The included angle between the anti-leakage stable tangent main edge (321d) and the two adjacent choke straight edges (31) is the same, and the anti-leakage stable tangent main edge (321d) and the two field cutoff control edges (322d) are symmetrically arranged about the center line of the choke corner edge (32).

10. The door assembly according to claim 9, characterized in that, The field cutoff control edge (322d) and its corresponding choke straight edge (31) are parallel.

11. The door assembly according to any one of claims 1-10, characterized in that, The choke straight edge (31) has a plurality of straight edge tooth grooves (31a) arranged at intervals to form a plurality of straight edge choke teeth (31b); the two straight edge tooth grooves (31a) adjacent to the choke straight edge (31) and the choke corner edge (32) form a corner choke tooth (32b), and the two ends of the choke corner edge (32) are respectively connected to the groove wall of the closest straight edge tooth groove (31a).

12. The door assembly according to any one of claims 1-10, characterized in that, The choke straight edge (31) has a plurality of straight edge tooth grooves (31a) arranged at intervals to form a plurality of straight edge choke teeth (31b); the choke corner edge (32) has at least one corner tooth groove (32a) to form at least two corner choke teeth (32b), and the two ends of the choke corner edge (32) are respectively connected to the groove wall of the nearest straight edge tooth groove (31a).

13. The door assembly according to claim 12, characterized in that, The corner edge tooth groove (32a) is set as one and located at the center line of the choke corner edge (32), or the corner edge tooth groove (32a) is set as at least two and arranged at equal intervals on the choke corner edge (32).

14. The door assembly according to claim 12, characterized in that, The groove depth of the corner edge tooth groove (32a) is less than the groove depth of the straight edge tooth groove (31a).

15. A cooking device, characterized in that, Includes the door assembly as described in any one of claims 1-14.

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