Door body assembly and cooking equipment

Abstract

The invention discloses a door body assembly which is applied to cooking equipment and comprises a door body, a choke groove is formed in the inner surface of the door body, and the choke groove is provided with a linear choke groove linear section and an arc-shaped choke groove corner section; the choke plate and the choke groove form a choke structure; the outer periphery of the choke plate is provided with a linear choke straight line edge corresponding to the choke groove straight line section and a choke corner edge corresponding to the choke groove corner section, and the choke corner edge comprises a linear anti-leakage stable tangent main edge and two linear field cut-off cooperative control edges located on the two sides of the anti-leakage stable tangent main edge respectively. Included angles are formed between the anti-leakage stable tangent main edge and the two field cut-off cooperative control edges, and included angles are formed between the anti-leakage stable tangent main edge and the two adjacent choking linear edges. The invention further discloses the cooking equipment. The invention has the beneficial effects that the microwave leakage rate at the four corners can be effectively reduced, and the microwave leakage rate is within an ideal range of 0.4-1.2 wm / cm < 2 >.

Description

Technical Field

[0001] The present invention relates to a door body assembly and a cooking device, belonging to the technical field of kitchen appliances. Background Art

[0002] At present, cooking devices such as steam ovens and microwave ovens have the function of microwave cooking. For the microwave function, the shielding effect of the door body is very important. If the shielding effect is not ideal, it will cause potential safety hazards of microwave leakage.

[0003] In the prior art, for the door body assembly of a cooking device, a choke groove and a choke plate are provided on its inner surface to form a choke structure, and the choke structure can shield the microwave in the inner container of the cooking device. It is found through detection that for the vast majority of choke structures, the microwave leakage at its four sides is within the ideal range of 0.4 - 1.2 wm / cm 2 However, the microwave leakage at its four corners is as high as 2.5 - 3.3 wm / cm 2 which is much higher than the ideal range of 0.4 - 1.2 wm / cm 2 . Summary of the Invention

[0004] The purpose of the present invention is to provide a door body assembly and a cooking device, which can effectively reduce the microwave leakage at the four corners and make the microwave leakage within the ideal range of 0.4 - 1.2 wm / cm 2 .

[0005] The present invention is achieved by the following technical solutions.

[0006] A door body assembly is applied to a cooking device and includes a door body. A choke groove is formed on the inner surface of the door body along its edge and is recessed. The choke groove has four choke groove straight segments. The four choke groove straight segments are linear and any two adjacent choke groove straight segments are perpendicular to each other. An arc-shaped choke groove corner segment is connected between any two adjacent choke groove straight segments;

[0007] And a choke plate is fixed on the inner surface of the door body and is located within the part surrounded by the choke groove. There is a gap between the outer periphery of the choke plate and the outer edge of the choke groove, so 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 straight 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 includes a straight anti-leakage and stability tangent main edge, and two straight field cut-off co-control edges respectively located on both sides of the anti-leakage and stability tangent main edge. Moreover, both the anti-leakage and stability tangent main edge and the two field cut-off co-control edges have included angles, and both the anti-leakage and stability tangent main edge and the two adjacent choke straight edges have included angles.

[0009] As a further improvement of the present invention, the choke corner edge further includes a choke corner remaining edge of any line type.

[0010] As a further improvement of the present invention, both ends of the choke corner remaining edge are respectively connected to the anti-leakage and stability tangent main edge and the field cut-off co-control edge.

[0011] As a further improvement of the present invention, both ends of the anti-leakage and stability tangent main edge are respectively connected to the two field cut-off co-control edges.

[0012] As a further improvement of the present invention, the included angles between the anti-leakage and stability tangent main edge and the two adjacent choke straight edges are of the same size, and the anti-leakage and stability tangent main edge and the two field cut-off co-control edges are symmetrically arranged about the center line of the choke corner edge.

[0013] As a further improvement of the present invention, the field cut-off co-control edge is parallel to the corresponding choke straight edge.

[0014] As a further improvement of the present invention, the choke straight edge has a plurality of linearly spaced-apart straight edge tooth grooves to form a plurality of straight edge choke teeth; and, the two straight edge tooth grooves on the choke straight edge adjacent to the choke corner edge form a corner choke tooth.

[0015] As a further improvement of the present invention, the field cut-off co-control edge is connected to the groove wall of the straight edge tooth groove closest to it.

[0016] As a further improvement of the present invention, the choke straight edge has a plurality of linearly spaced-apart straight edge tooth grooves to form a plurality of straight edge choke teeth; the choke corner edge has at least one corner edge tooth groove to form at least two corner choke teeth.

[0017] As a further improvement of the present invention, the field cut-off co-control edge is connected to the groove wall of the straight edge tooth groove closest to it.

[0018] As a further improvement of the present invention, the corner edge tooth groove is provided as one and is located at the center line of the choke corner edge, or, the corner edge tooth groove is provided as at least two and is equally spaced on the choke corner edge.

[0019] As a further improvement of the present invention, the groove depth of the corner edge groove is less than the groove depth of the straight edge groove.

[0020] A cooking device includes the door body assembly.

[0021] Advantages of the present invention:

[0022] The choke corner edge is provided with a straight anti-leakage and stability-tangent main edge and two field cutoff co-control edges, and a three-edge structure of field cutoff co-control edge - anti-leakage and stability main tangent edge - field cutoff co-control edge is formed to suppress geometric mutations and optimize the physical mechanism of field distribution, so that the choke corner edge is optimized in four aspects of impedance matching, field strength uniformity, reflection controllability, and processing stability, thereby effectively reducing the microwave leakage amount, and reducing the microwave leakage amount at the four corners of the door body assembly to the ideal range of 0.4 - 1.2 wm / cm 2 。 BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The preferred embodiments of the present invention will be described in detail below with reference to the drawings to help understand the purpose and advantages of the present invention, where:

[0024] Figure 1 is a schematic structural diagram of the door body assembly;

[0025] Figure 2 is a schematic cross-sectional view of the choke structure;

[0026] Figure 3 is a partial schematic diagram of the door body assembly of Embodiment 1 with respect to the choke corner edge;

[0027] Figure 4 is a partial schematic diagram of the door body assembly of Embodiment 2 with respect to the choke corner edge;

[0028] Figure 5 is a partial schematic diagram of the door body assembly of Embodiment 3 with respect to the choke corner edge;

[0029] Figure 6 is a partial schematic diagram of the door body assembly of Embodiment 4 with respect to the choke corner edge. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0031] In this specification, the orientation terms such as up, down, left, right, front, back, front side, back side, top, bottom, etc., which are mentioned or may be mentioned, are defined with respect to the structures shown in the respective drawings. The terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component. They are relative concepts and may accordingly change depending on their different positions and usage states. Therefore, these or other orientation terms should not be construed as restrictive terms.

[0032] The door body assembly of the embodiment of the present application is applied in a cooking device and is used to open or close the inner cavity of the cooking device through a switch. Refer to Figures 1-6 , the door body assembly includes a door body 1, a choke plate 3, an outer door frame 11, and an outer door glass 12. Among them, the door body 1 is divided into an inner surface and an outer surface. The inner surface is the side facing the inner cavity, and the outer surface is the side facing away from the inner cavity. The outer door frame 11 is connected to the edge of the door body 1, and the outer door glass 12 is fixed on the outer surface of the door body 1. A choke groove 2 is provided on the inner surface of the door body 1. The choke groove 2 is arranged along the edge of the door body 1 and is recessed to form a rectangular closed structure. The choke groove 2 has choke groove straight segments 21 that are opposite to each other in pairs and are straight, and choke groove corner segments 22 that connect two adjacent choke groove straight segments 21 and are arc-shaped.

[0033] The choke plate 3 is fixed on the inner surface of the door body 1 and is located on the part of the inner surface surrounded 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.

[0034] The outer periphery of the choke plate 3 has a choke straight edge 31 corresponding to the choke groove straight segment 21 and a choke corner edge 32 corresponding to the choke groove corner segment 22. Among them, the choke corner edge 32 includes an anti-leakage stable tangent main edge 321 and two straight field cut-off co-control edges 322 that are respectively located on both sides of the anti-leakage stable tangent main edge 321. Moreover, the anti-leakage stable tangent main edge 321 and the two field cut-off co-control edges 322 both have an included angle, and the anti-leakage stable tangent main edge 321 and the two adjacent choke straight edges both have an included angle.

[0035] In the prior art, the microwave leakage amount at the four corners of the door body assembly corresponding to the choke groove 2 and the choke plate 3 is relatively high, that is, the microwave leakage amount at the arc corners of the choke structure is relatively high. The applicant has found through research that the reasons for the high leakage amount include the following:

[0036] I. Impedance continuity disruption

[0037] The electromagnetic shielding effectiveness of the choke groove is based on the 1 / 4 wavelength short - circuit transmission line theory. Its core is to achieve the phase - inversion cancellation of microwave energy through impedance matching. The arc edges introduce geometric mutations at the four corners, disrupting the continuity of the cross - section of the transmission line and causing the electromagnetic field distribution in local areas to deviate from the ideal state. This geometric mutation leads to impedance mismatch, making part of the microwave energy unable to be effectively cancelled through phase inversion and thus leaking from the door body gap.

[0038] II. Edge effect of electromagnetic field

[0039] The electric - field distribution of microwaves at the edge of the metal structure follows the law of edge effect. The smaller the radius of curvature, the more significant the field - strength concentration phenomenon. Although the curvature characteristics of the arc edges at the four corners are better than those of acute angles, local electric - field convergence points will still be formed. This field - strength concentration may lead to two problems: one is that the local electric - field intensity exceeds the breakdown voltage threshold of the door - body material, forming micro - discharges or breakdown channels; the other is that the uneven field - strength distribution causes part of the energy to bypass the shielding path of the choke groove and directly leak from the high - field - strength area.

[0040] III. Reflection - path problem

[0041] The reflection - path accuracy of microwaves in the door - body choke structure directly determines the leakage - suppression effect. The geometric characteristics of the arc edges at the four corners cause the microwaves to scatter and diffract: on the one hand, the incident wave undergoes non - directional reflection on the arc surface, and part of the energy deviates from the preset path; on the other hand, the curvature of the arc edge causes a diffraction effect, generating diffracted waves that bypass the choke groove. Both of these phenomena weaken the cancellation effect of phase inversion and form residual leakage.

[0042] IV. Processing and assembly - accuracy problem

[0043] The assembly accuracy of the door - body choke structure directly affects the shielding performance. The arc edges have extremely high requirements for die - processing and stamping processes: firstly, the radius of curvature of the arc corners needs to be strictly matched with the choke groove. If there is a deviation of more than ±0.1 mm, local gaps will appear between the choke plate and the groove body; secondly, there is a spring - back effect after the metal sheet is stamped into shape, and the spring - back compensation of the arc corners needs to be achieved through complex die design, and the process stability is difficult to guarantee.

[0044] In this embodiment, by setting a straight - line anti - leakage and stability - tangent main edge 321 on the choke turning edge 32, the arc - corner structure of the choke structure is damaged and changed, thereby being able to reduce the microwave leakage amount. Specifically, it is elaborated in detail from the following aspects:

[0045] I. Optimization of impedance continuity

[0046] The anti-leakage and stability tangent main edge 321 and two field cutoff co-control edges 322 form a three-edge structure, reconstructing the waveguide cutoff condition at the four corners. Compared with the curvature mutation of the circular arc edge, the three-edge structure of the field cutoff co-control edge 322 - anti-leakage and stability tangent main edge 321 - field cutoff co-control edge 322 enables the electromagnetic wave propagation direction to form an orthogonal match with the metal boundary. The anti-leakage and stability tangent main edge 321 guides the microwave propagation, and the two side field cutoff co-control edges 322 respectively maintain a linear transition of the impedance gradient in the other two directions. This three-edge structure eliminates the offset of the transverse current component caused by geometric mismatch of the circular arc edge, greatly improves the axial continuity of the equivalent transmission line impedance, and suppresses the standing wave resonance caused by high-order mode coupling.

[0047] II. Mitigation of Electric Field Concentration

[0048] The three-edge structure of the field cutoff co-control edge 322 - anti-leakage and stability tangent main edge 321 - field cutoff co-control edge 322 decouples the circular electric field convergence area at the corner of the circular arc edge into three orthogonal field components through the discrete boundary constraint of the field cutoff co-control edge 322. The anti-leakage and stability tangent main edge 321 forces the electric field lines to decay uniformly, while the field cutoff co-control edges 322 block the field strength diffusion in two directions respectively. The synergistic effect of the anti-leakage and stability tangent main edge 321 and the field cutoff co-control edge 322 significantly reduces the maximum field strength value at the four corners compared with the circular arc edge, and improves the field distribution uniformity index. At the same time, the linear boundary effectively suppresses the distortion and escape of the electric field lines at the ends of the four corners, avoiding the risk of dielectric breakdown.

[0049] III. Reflection Path Correction

[0050] The anti-leakage and stability tangent main edge 321 constrains the reflection behavior of the incident microwave into a directional reflection mode, and the field cutoff co-control edge 322 forms a phase synchronous superposition with the main tangent edge reflected wave through the reflection paths in the other two directions. Compared with the multi-directional scattering and diffraction caused by the circular arc edge, the three-edge structure greatly compresses the diffraction path length, thereby effectively reducing the proportion of residual leakage energy. In addition, the optical path difference compensation mechanism of the anti-leakage and stability tangent main edge 321 and the field cutoff co-control edge 322 greatly reduces the phase error between the reflected wave and the original leakage wave, thus significantly improving the energy cancellation efficiency.

[0051] IV. Solving the Assembly Precision Problem

[0052] The straight-line three-edge setting reduces the processing complexity compared with the circular arc edge. The manufacturing tolerance of the straight stamping die can be controlled within ±0.02 mm, and the springback direction is single. The springback error can be eliminated through pre-compensation design. This process characteristic greatly improves the uniformity of the assembly gap between the choke plate 3 and the choke groove 2, effectively avoiding leakage caused by excessive local gaps.

[0053] In addition, it should be noted that:

[0054] In theory, setting the choke groove corner section 22 as a straight-line structure instead of an arc structure can also achieve the above technical effects. Or, the technical effect of the straight-line choke groove corner section 22 cooperating with the straight-line anti-leakage and stability-maintaining tangent main edge 321 is better.

[0055] However, in actual production and processing, the choke groove 2 is formed on the door body 1 through a stamping process. If the choke groove corner section 22 is designed as a straight-line structure, a more complex stamping process is required, which involves the complexity of the mold, related material handling problems, and the addition of a heat treatment process, resulting in a higher processing difficulty and an increase in the production and processing cost. In addition, designing the choke groove corner section 22 as a straight-line structure will cause the stress at the corresponding position of the door body 1 at the choke groove corner section 22 to be relatively concentrated, which is not conducive to the structural strength stability.

[0056] On the contrary, compared with the arc-shaped processing, setting the choke turning edge 32 as a three-cut edge structure including a straight-line field cutoff co-control edge 322 - anti-leakage and stability-maintaining tangent main edge 321 - field cutoff co-control edge 322 has a relatively low processing difficulty. Therefore, it can not only effectively reduce the microwave leakage amount but also reduce the processing difficulty of the choke plate 3.

[0057] Implementation Case 1:

[0058] A door body assembly, referring to Figure 3 , in this implementation case, the choke turning edge 32 includes an anti-leakage and stability-maintaining tangent main edge 321, two field cutoff co-control edges 322, and a choke turning remaining edge 323. Among them, the anti-leakage and stability-maintaining tangent main edge 321 and the two field cutoff co-control edges 322 are straight-line types, and the choke turning remaining edge 323 can be of any line type, such as a straight-line type, an arc type, a curve type, etc.

[0059] In this implementation case, the two ends of the choke turning remaining edge 323 are respectively connected to the anti-leakage and stability-maintaining tangent main edge 321 and the field cutoff co-control edge 322.

[0060] In this implementation case, the angles between the anti-leakage and stability-maintaining tangent main edge 321 and the two adjacent choke straight edges 31 are the same. That is, when the choke straight edges 31 are vertical and horizontal, the anti-leakage and stability-maintaining tangent main edge 321 is inclined at 45°, and the anti-leakage and stability-maintaining tangent main edge 321 and the two field cutoff co-control edges 322 are symmetrically arranged about the center line of the choke turning edge.

[0061] In this implementation case, the field cutoff co-control edge 322 is parallel to its corresponding choke straight edge, that is, one field cutoff co-control edge 322 is a vertical edge, and the other field cutoff co-control edge 322 is a horizontal edge.

[0062] In this embodiment, the anti-leakage stable tangent main side 321 and the field cutoff co-control side 322 respectively play a role in reducing the microwave leakage. The choke corner remaining side 323 serves as a decorative side outside the anti-leakage stable tangent main side 321 and the field cutoff co-control side 322, making the choke corner side 32 complete in shape.

[0063] Embodiment 2:

[0064] A door body assembly. Refer to Figure 4 , in this embodiment, the choke corner side 32 is only provided with a linear anti-leakage stable tangent main side 321 and two linear field cutoff co-control sides 322, that is, both ends of the anti-leakage stable tangent main side 321 are respectively connected to the two field cutoff co-control sides 322.

[0065] In this embodiment, the angles between the anti-leakage stable tangent main side 321 and the two adjacent choke straight sides 31 are of the same size. That is, when the choke straight sides 31 are vertical and horizontal, the anti-leakage stable tangent main side 321 is inclined at 45°, and the anti-leakage stable tangent main side 321 and the two field cutoff co-control sides 322 are symmetrically arranged about the center line of the choke corner side.

[0066] In this embodiment, the field cutoff co-control side 322 is parallel to its corresponding choke straight side, that is, one field cutoff co-control side 322 is a vertical side and the other field cutoff co-control side 322 is a horizontal side.

[0067] Embodiment 3:

[0068] A door body assembly. Refer to Figure 5 , based on Embodiment 2, in this embodiment, the choke straight side 31 has a plurality of linearly arranged and spaced-apart straight-side tooth grooves 31a to form a plurality of straight-side choke teeth 31b. The choke corner side 32 is not provided with tooth grooves. Therefore, the two straight-side tooth grooves 31a adjacent to the choke corner side 32 on the choke straight side 31 form a corner choke tooth 32b.

[0069] The straight-side choke teeth 31b extend the microwave propagation path through a periodic tooth groove structure, and use the 1 / 4 wavelength resonance principle to generate multiple reflected wave superpositions, forming impedance mutation points on the straight side to reflect the leaked energy. At the same time, the electric field gradient distribution between adjacent tooth grooves can suppress the propagation of transverse surface waves.

[0070] In this embodiment, since the choke corner side 32 is not provided with tooth grooves, the adjacent straight-segment tooth grooves naturally extend and intersect to form a corner choke tooth 32b that is wider than the straight-side choke tooth 31b. The corner choke tooth 32b destroys the phase consistency of the microwave diffraction path, forcing the diffracted waves with different incident angles to generate self-interference cancellation in the corner area.

[0071] In this embodiment, the field cutoff co-control edge 322 is connected to the groove wall of the straight-edge tooth groove 31a closest to it.

[0072] Embodiment 4:

[0073] A door body assembly, referring to Figure 6 , based on Embodiment 2, in this embodiment, there are a plurality of straight-edge tooth grooves 31a arranged at intervals on the choke straight edge 31 to form a plurality of straight-edge choke teeth 31b. There is at least one corner-edge tooth groove 32a on the choke corner edge 32 to form at least two corner-edge choke teeth 32b.

[0074] The difference between this embodiment and Embodiment 3 is that no corner-edge choke teeth 32b are provided on the choke corner edge 32 in Embodiment 3, while in this embodiment, corner-edge tooth grooves 32a are provided on the corner-edge choke teeth 32b.

[0075] In this embodiment, by providing corner-edge tooth grooves 32a on the choke corner edge 32 to form corner-edge choke teeth 32b, a single diffraction path is divided into multiple resonant cavities through periodic impedance mutations, forcing the microwave to undergo multiple phase reversals, triggering self-interference cancellation of the diffracted wave. At the same time, the corner-edge tooth grooves 32a disrupt the continuity of the surface wave propagation, reducing microwave leakage and suppressing the extension of the frequency band to higher frequencies.

[0076] In this embodiment, the field cutoff co-control edge 322 is connected to the groove wall of the straight-edge tooth groove 31a closest to it.

[0077] In some embodiments, the corner-edge tooth groove 32a is provided as one and is located at the center line of the choke corner edge 32.

[0078] In another embodiment, the corner-edge tooth grooves 32a are provided as at least two and are arranged at equal intervals on the choke corner edge 32.

[0079] 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 body of the corner-edge tooth groove 32a is 30%-70% of the groove body 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, that is, referring to Figure 6 , the length of d2 is less than d1.

[0080] Embodiment 5:

[0081] A cooking device, including a door body assembly, and the door body assembly is as shown in Embodiments 1-4. Among them, the cooking device includes a steam oven and a microwave oven.

[0082] Experimental case:

[0083] The gaps between the four straight edges of the door body component and the inner container of the cooking device are pasted with aluminum foil, leaving only the gaps between the four corner edges of the door body component and the inner container. The four corner edges of the door body component are respectively marked as position 1, position 2, position 3, and position 4, corresponding to the arc corners of the choke structure. Then, the microwave leakage amounts at position 1, position 2, position 3, and position 4 are detected. Since the gaps at the straight edges are sealed with aluminum foil, microwave leakage at the straight edges can be effectively avoided from interfering with the corner edges, ensuring the effectiveness of the detection.

[0084] Implementing Case 3 and Implementing Case 4 are respectively detected, and the detection results are as follows:

[0085] Microwave leakage detection results of Implementing Case 3:

[0086] The first group of data

[0087]

[0088]

[0089] The second group of data

[0090]

[0091] The third group of data

[0092]

[0093] It can be seen that the microwave leakage amount of Implementing Case 3 drops from the range of 2.5 - 3.3 wm / cm 2 to the range of 0.4 - 1.2 wm / cm 2 of the range.

[0094] Microwave leakage detection results of Implementing Case 4:

[0095] The first group of data

[0096]

[0097] The second group of data

[0098]

[0099] The third group of data

[0100]

[0101]

[0102] It can be seen that the microwave leakage amount of Implementing Case 4 drops from the range of 2.5 - 3.3 wm / cm 2 to the range of 0.4 - 1.2 wm / cm 2range.

[0103] It should be noted that the leakage amounts at positions 3 and 4 are generally higher than those at positions 1 and 2. After research, the applicant found that the reasons for this result are as follows:

[0104] Since the experimental materials are not the final commercialized products, the manufacturing and processing requirements are lower than those for commercialization. Due to varying degrees of depressions and protrusions in the door body assembly, the flatness is not ideal, and there are differences in the hinge force and installation force deviations during assembly. Eventually, the gaps between the door body assembly and the front panel of the inner liner are different. Coupled with the inconsistent projection lengths of the top edge and bottom edge of the door body assembly on the front panel of the inner liner, generally, the projection length of the top edge of the door body assembly on the front panel of the inner liner is greater than that of the bottom edge of the door body assembly on the front panel of the inner liner. Therefore, the microwave leakage amounts at points 1 and 2 are less than those at points 3 and 4, which is not a defect of the technical solution.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A door assembly, applied to cooking equipment, characterized in that: The invention comprises a door body (1), wherein the inner surface of the door body (1) has a choke slot (2) arranged along the edge thereof and formed in a concave shape, wherein the choke slot (2) has four choke slot straight line segments (21), wherein the four choke slot straight line segments (21) are straight line-shaped and any two adjacent choke slot straight line segments (21) are perpendicular to each other, and any two adjacent choke slot straight line segments (21) are connected by an arc-shaped choke slot corner segment (22); and a choke plate (3), the choke plate (3) being fixed on the inner surface of the door body (1) and being located within the portion enclosed by the choke slot (2); a gap being provided between the outer periphery of the choke plate (3) and the outer edge of the choke slot (2), so that the choke plate (3) blocks a portion of the choke slot (2) and forms a choke structure with the choke slot (2); The outer periphery of the choke plate (3) comprises a straight choke straight edge (31) corresponding to the choke slot straight section (21), and a choke corner edge (32) corresponding to the choke slot corner section (22); the choke corner edge (32) comprises a straight anti-leakage stabilizing phase-tangent main edge (321), and two straight field cut-off auxiliary control edges (322) respectively located on both sides of the anti-leakage stabilizing phase-tangent main edge (321); and the anti-leakage stabilizing phase-tangent main edge (321) and the two field cut-off auxiliary control edges (322) both have an angle, and the anti-leakage stabilizing phase-tangent main edge (321) and the two adjacent choke straight edges (31) both have an angle.

2. The door assembly according to claim 1, characterized in that: The choke corner edge (32) further includes a choke corner residual edge (323) of any linear type.

3. The door assembly according to claim 2, characterized in that: Two ends of the choke corner residual edge (323) are respectively connected to the anti-leakage stabilizing phase tangent main edge (321) and the field cutoff auxiliary control edge (322).

4. The door assembly according to claim 1, characterized in that: Two ends of the anti-leakage stabilizing phase-tangent main edge (321) are respectively connected to the two field-stop auxiliary control edges (322).

5. The door assembly according to any one of claims 1 to 4, characterized in that: The included angles of the anti-leakage stabilizing phase-tangent main edge (321) and the two adjacent choke straight line edges (31) are the same, and the anti-leakage stabilizing phase-tangent main edge (321) and the two field cutoff co-control edges (322) are symmetrically arranged about the center line of the choke corner edge (32).

6. The door assembly according to claim 5, characterized in that: The field stop co-control edge (322) is parallel to the corresponding choke straight line edge (31).

7. The door assembly according to any one of claims 1 to 4, characterized in that: The choke straight edge (31) has a plurality of straight edge tooth grooves (31a) arranged at intervals from each other to form a plurality of straight edge choke teeth (31b); and two straight edge tooth grooves (31a) adjacent to the choke straight edge (31) and the choke corner edge (32) form corner choke teeth (32b).

8. The door assembly according to claim 7, characterized in that: The field stop co-control edge (322) is connected to the groove wall of the linear edge tooth groove (31a) closest thereto.

9. The door assembly according to any one of claims 1 to 4, characterized in that: The choke straight edge (31) has a plurality of straight edge tooth grooves (31a) arranged at intervals from each other to form a plurality of straight edge choke teeth (31b); the choke corner edge (32) has at least one corner edge tooth groove (32a) to form at least two corner choke teeth (32b).

10. The door assembly according to claim 9, characterized in that: The field stop co-control edge (322) is connected to the groove wall of the linear edge tooth groove (31a) closest thereto.

11. The door assembly according to claim 9, characterized in that: The corner edge tooth groove (32a) is provided as one and is located at the center line of the choke corner edge (32), or the corner edge tooth groove (32a) is provided as at least two and is arranged at equal intervals on the choke corner edge (32).

12. The door assembly according to claim 9, characterized in that: The groove body depth of the corner side tooth groove (32a) is smaller than the groove body depth of the straight side tooth groove (31a).

13. A cooking device, characterized in that: The invention comprises the door assembly as described in any one of claims 1 to 12.

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