Radio frequency antenna assembly and cooking device

Abstract

The application provides a radio frequency antenna assembly and a cooking device, and relates to the technical field of kitchen utensils.The radio frequency antenna assembly comprises a connecting assembly, a feed-in rod, a radiation plate and a grounding piece.The connecting assembly is electrically connected to the radiation plate through the feed-in rod.The grounding piece is electrically connected to one end of the radiation plate and the other end of the inner container.Compared with the linear radiation characteristics of the existing radiation rod, the radiation plate of the radio frequency antenna assembly serves as a planar radiator, and the current distribution is more dispersed and the coverage is wider.Because the projection of the feed-in rod on the radiation plate falls completely within the radiation plate, the microwave energy can be uniformly coupled throughout the domain relying on the planar carrier of the radiation plate, and then diffused and radiated along the full surface of the radiation plate, thereby avoiding the problem of energy concentration in the linear direction.Through the wide coverage characteristics of the planar radiation of the radiation plate, the microwave field is more uniformly distributed in each area of the inner container, avoiding local energy concentration.

Description

Technical Field

[0001] This application relates to the field of kitchenware technology, and in particular to a radio frequency antenna assembly and cooking equipment. Background Technology

[0002] Microwave ovens, as household appliances that use microwave energy to quickly heat food, are widely used in various scenarios such as home kitchens, the catering industry, and offices due to their high efficiency and convenience. The core principle of microwave heating is to generate high-frequency electromagnetic energy through a microwave source (such as a magnetron or solid-state radio frequency source), which is then radiated into the interior of the microwave oven via an antenna assembly. This causes the polar molecules (such as water molecules) in the food to vibrate rapidly, generating heat and thus achieving rapid heating. The antenna assembly serves as the key carrier for microwave energy transmission and radiation.

[0003] Currently, most microwave oven antenna assemblies employ a combination structure of a "feed-in rod + radiating rod". In this structure, one end of the feed-in rod is electrically connected to the output end of the microwave source (the center conductor of a coaxial cable), while the other end extends into the microwave oven's interior and is fixedly connected to the radiating rod, forming a complete energy transmission path. Specifically, the microwave energy generated by the magnetron is transmitted to the feed-in rod via a transmission line. The feed-in rod couples the energy to the radiating rod, which then diffuses the microwave energy into the interior space through linear radiation, thereby affecting the food.

[0004] As a linear radiator, the current distribution of the radiating rod is concentrated along its axial direction, and the microwave energy is mainly radiated along the extension direction of the rod, resulting in a microwave field with a "linear diffusion" characteristic. This leads to a high concentration of microwave energy near the radiating rod, making food prone to localized overcooking; while the corners of the inner pot and areas outside the extension direction of the radiating rod have weak energy, resulting in insufficient heating of the food, thus causing poor microwave radiation uniformity of the existing antenna assembly. Utility Model Content

[0005] This application provides a radio frequency antenna assembly and a cooking device to solve the technical problem of poor microwave radiation uniformity of existing antenna assemblies.

[0006] A first aspect of this application provides a radio frequency antenna assembly, including:

[0007] A connecting assembly, located outside the inner pot of a cooking appliance, includes an inner conductor and an outer conductor, with a gap formed between the inner conductor and the outer conductor, the outer conductor being used to electrically connect the outer conductor of a coaxial cable to the inner pot;

[0008] Feed rod, the inner conductor is used to electrically connect the center conductor of the coaxial cable to one end of the feed rod, and the other end of the feed rod extends into the interior of the inner liner;

[0009] A radiating plate is electrically connected to the end of the feed rod away from the inner conductor, and has a first gap between it and the inner wall of the inner liner at the feed rod. The projection of the feed rod toward the radiating plate is located inside the radiating plate, and the projection has a first distance between it and the peripheral sidewall of the radiating plate.

[0010] The grounding component is electrically connected at one end to the radiating plate and at the other end to the inner liner.

[0011] In one possible implementation, the radiating plate is a rectangular plate, and the axis of the feed rod is located at the center of the rectangular plate.

[0012] In one possible implementation, the rectangular plate includes a first long side and a first wide side, the length of the first long side being greater than the length of the first wide side, and the first long side extending toward the inner wall of the inner liner at the feed rod to form the grounding element.

[0013] In one possible implementation, a mounting plate is also included, which is disposed on the inner wall of the inner liner at the feed rod, and the end of the grounding member away from the radiating plate is electrically connected to the inner liner through the mounting plate.

[0014] In one possible implementation, the mounting plate is provided with a through hole, the end of the feed rod away from the inner conductor passes through the through hole and is connected to the radiating plate, there is a second gap between the feed rod and the through hole, and there is a third gap between the radiating plate and the mounting plate.

[0015] In one possible implementation, the radiating plate is parallel to the mounting plate, and the mounting plate is parallel to the inner wall of the inner liner at the feed rod.

[0016] In one possible implementation, the diameter of the feed rod ranges from 3 mm to 5 mm, and the distance of the third gap ranges from 4 mm to 7 mm.

[0017] In one possible implementation, the length of the first long side ranges from 40mm to 48mm, and the length of the first wide side ranges from 26mm to 34mm.

[0018] In one possible implementation, the side of the grounding member facing the mounting plate includes a second long side and a second wide side, the length of the second long side being the same as the length of the first long side, and the length of the second wide side ranging from 9 mm to 12 mm.

[0019] A second aspect of this application provides a cooking apparatus, comprising:

[0020] Inner liner;

[0021] The radio frequency antenna assembly described in any of the above claims, wherein the radio frequency antenna assembly is disposed on the inner liner.

[0022] This application provides a radio frequency antenna assembly and a cooking device. The radio frequency antenna assembly radiates microwave signals into a cavity through a radiating plate. Because the projection of the feed rod is completely located within the radiating plate, and there is a first distance between the projection and the peripheral wall of the radiating plate (i.e., the area of ​​the radiating plate is larger than the area of ​​the projection of the feed rod), compared to the linear radiation characteristics of existing radiating rods, the radiating plate of this application, as a planar radiator, has a more dispersed current distribution and a wider coverage area. Furthermore, since the projection of the feed rod on the radiating plate falls completely within the radiating plate, microwave energy can achieve uniform coupling across the entire area using the planar carrier of the radiating plate, and then diffuse and radiate along the entire surface of the radiating plate. This arrangement ensures that the energy coupling area covers the entire area of ​​the radiating plate, ensuring that the energy is fully converted into a planar microwave field. Microwave energy can achieve full-area planar coupling and diffusion through the radiating plate, avoiding the problem of energy concentration along the linear direction. Through the wide coverage characteristics of the planar radiation of the radiating plate, the microwave field is more evenly distributed in all areas of the inner pot, avoiding local energy concentration, ensuring that all parts of the food are heated more evenly and fully, and effectively reducing the occurrence of local overcooking or undercooking of food. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0024] Figure 1 A schematic diagram of the structure of a radio frequency antenna assembly provided for an embodiment of this application;

[0025] Figure 2 for Figure 1 A structural diagram from another angle;

[0026] Figure 3 A cross-sectional structural diagram of a radio frequency antenna assembly provided for an embodiment of this application;

[0027] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0028] Figure 5 A top-view structural diagram of a radio frequency antenna assembly provided for an embodiment of this application;

[0029] Figure 6 A schematic diagram of the radio frequency antenna assembly provided in an embodiment of this application from a bottom-view angle.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100 - Connecting component; 110 - Inner conductor; 120 - Outer conductor;

[0032] 200-Feed rod;

[0033] 300 - Radiation plate; 310 - First long side; 320 - First wide side;

[0034] 400 - Grounding element; 410 - Second long side; 420 - Second wide side;

[0035] 500 - Mounting plate; 510 - Through hole;

[0036] 600 - First connecting hole;

[0037] 700 - Second connection hole.

[0038] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0039] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. Other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are all within the scope of protection of this application.

[0040] It should be noted that the directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0041] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, and a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0043] Microwave ovens, as household appliances that use microwave energy to quickly heat food, are widely used in various scenarios such as home kitchens, the catering industry, and offices due to their high efficiency and convenience. The core principle of microwave heating is to generate high-frequency electromagnetic energy through a microwave source (such as a magnetron or solid-state radio frequency source), which is then radiated into the interior of the microwave oven via an antenna assembly. This causes the polar molecules (such as water molecules) in the food to vibrate rapidly, generating heat and thus achieving rapid heating. The antenna assembly serves as the key carrier for microwave energy transmission and radiation.

[0044] Currently, most microwave oven antenna assemblies employ a combination structure of a "feed-in rod + radiating rod". In this structure, one end of the feed-in rod is electrically connected to the output end of the microwave source (the center conductor of a coaxial cable), while the other end extends into the microwave oven's interior and is fixedly connected to the radiating rod, forming a complete energy transmission path. Specifically, the microwave energy generated by the magnetron is transmitted to the feed-in rod via a transmission line. The feed-in rod couples the energy to the radiating rod, which then diffuses the microwave energy into the interior space through linear radiation, thereby affecting the food.

[0045] As a linear radiator, the current distribution of the radiating rod is concentrated along its axial direction, and the microwave energy is mainly radiated along the extension direction of the rod, resulting in a microwave field with a "linear diffusion" characteristic. This leads to a high concentration of microwave energy near the radiating rod, making food prone to localized overcooking; while the corners of the inner pot and areas outside the extension direction of the radiating rod have weak energy, resulting in insufficient heating of the food, thus causing poor microwave radiation uniformity of the existing antenna assembly.

[0046] To address the technical problem of poor microwave radiation uniformity in existing antenna assemblies, this application proposes a radio frequency antenna assembly and a cooking device. The radio frequency antenna assembly includes a connecting component, a feed rod, a radiating plate, and a grounding component. The connecting component is located outside the inner pot of the cooking device and includes an inner conductor and an outer conductor, with a gap between them. The outer conductor is used to electrically connect the outer conductor of a coaxial cable to the inner pot. The inner conductor is used to electrically connect the center conductor of the coaxial cable to one end of the feed rod, and the other end of the feed rod extends into the interior of the inner pot. The radiating plate is electrically connected to the end of the feed rod away from the inner conductor and has a first gap between it and the inner wall of the inner pot at the feed rod location. The projection of the feed rod toward the radiating plate is located within the radiating plate, and there is a first distance between the projection and the peripheral sidewall of the radiating plate. One end of the grounding component is electrically connected to the radiating plate, and the other end is electrically connected to the inner pot.

[0047] In the radio frequency antenna assembly of this application, microwave signals are radiated into the cavity through a radiating plate. Since the projection of the feed rod is entirely within the radiating plate, and there is a first distance between the projection and the peripheral wall of the radiating plate (i.e., the area of ​​the radiating plate is larger than the area of ​​the feed rod's projection), compared to the linear radiation characteristics of existing radiating rods, the radiating plate of this application, as a planar radiator, has a more dispersed current distribution and a wider coverage area. Furthermore, since the projection of the feed rod on the radiating plate falls entirely within it, microwave energy can achieve uniform coupling across the entire area using the planar carrier of the radiating plate, and then diffuse and radiate along the entire surface of the radiating plate. This arrangement ensures that the energy coupling area covers the entire radiating plate, guaranteeing that energy is fully converted into a planar microwave field. Microwave energy can achieve full-area planar coupling and diffusion through the radiating plate, avoiding the problem of energy concentration along a linear direction. Through the wide coverage characteristics of the planar radiation of the radiating plate, the microwave field is more evenly distributed in all areas of the inner cavity, avoiding local energy concentration and ensuring more uniform and sufficient heating of all parts of the food, effectively reducing the occurrence of local overcooking or undercooking of food.

[0048] The technical solution of the application will be described in detail below with reference to the accompanying drawings and specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0049] Reference Figures 1 to 6 As shown, Figure 1 A schematic diagram of the structure of a radio frequency antenna assembly provided for an embodiment of this application; Figure 2 for Figure 1 A structural diagram from another angle; Figure 3 A cross-sectional structural diagram of a radio frequency antenna assembly provided for an embodiment of this application; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 A top-view structural diagram of a radio frequency antenna assembly provided for an embodiment of this application; Figure 6 A schematic diagram of the radio frequency antenna assembly provided in an embodiment of this application from a bottom-view angle.

[0050] In the embodiments of this application, reference is made to Figure 1 and Figure 3 As shown, an embodiment of this application provides a radio frequency antenna assembly, including a connection assembly 100, a feed rod 200, a radiating plate 300, and a grounding component 400.

[0051] The connecting assembly 100 is located outside the inner pot of the cooking device, and includes an inner conductor 110 and an outer conductor 120, with a gap formed between the inner conductor 110 and the outer conductor 120. The outer conductor 120 is used to electrically connect the outer conductor of the coaxial cable to the inner pot.

[0052] The inner conductor 110 is used to electrically connect the center conductor of the coaxial cable to one end of the feed rod 200, and the other end of the feed rod 200 extends into the interior of the inner liner;

[0053] The radiating plate 300 is electrically connected to the end of the feed rod 200 away from the inner conductor 110, and there is a first gap between the radiating plate 300 and the inner wall of the inner liner at the feed rod 200. The projection of the feed rod 200 toward the radiating plate 300 is located inside the radiating plate 300, and there is a first distance between the projection and the peripheral sidewall of the radiating plate 300.

[0054] One end of the grounding component 400 is electrically connected to the radiating plate 300, and the other end is electrically connected to the inner liner.

[0055] In the radio frequency antenna assembly of this application, one end of the coaxial cable is electrically connected to the microwave source, and the other end of the coaxial cable is electrically connected to the radio frequency antenna assembly of this application. The coaxial cable includes a center conductor and an outer conductor. The center conductor of the coaxial cable is electrically connected to the inner conductor 110, and the outer conductor of the coaxial cable is electrically connected to the outer conductor 120. The outer conductor of the coaxial cable is electrically connected to the inner cavity of the microwave oven through the outer conductor 120, thereby grounding the outer conductor of the coaxial cable.

[0056] Microwave signals are input from a microwave source to the connecting assembly 100 via a coaxial cable. The outer conductor 120 of the connecting assembly 100 acts as a shielding layer to prevent microwave signal leakage. Simultaneously, the microwave signal is transmitted to the feed rod 200 through the connection between the inner conductor 110 and the feed rod 200. Since the radiating plate 300 is electrically connected to the feed rod 200, the feed rod 200 transmits the microwave signal to the radiating plate 300. Finally, the radiating plate 300 radiates the microwave signal into the cavity of the inner liner.

[0057] The feed rod 200 is used to transmit the microwave signal from the connection assembly 100 to the radiating plate 300. Specifically, the feed rod 200 can be a cylindrical structure made of metal conductor or composite material.

[0058] There is a first gap between the radiant plate 300 and the inner wall of the inner liner. It should be noted that the gap distance between the radiant plate 300 and the inner wall on different sides of the inner liner is not the same. It is only necessary to ensure that there is a gap between the radiant plate 300 and the inner wall on different sides of the inner liner to ensure that the radiant plate 300 and the inner wall on different sides of the inner liner do not directly contact each other.

[0059] The radiating plate 300 is used to radiate microwave signals into the cavity of the inner liner. The radiating surface of the radiating plate 300 can be a planar or curved structure. Specifically, the radiating plate 300 can be a rectangular, elliptical or corrugated metal plate.

[0060] The grounding component 400 is used to ground the radiating plate 300. The grounding component 400 can be a metal rod or a metal plate, etc.

[0061] The outer conductor 120 is used to shield microwave signals and form a transmission path. Specifically, the outer conductor 120 can be a cylindrical shell made of copper or aluminum tube.

[0062] In the radio frequency antenna assembly of this application, since the microwave signal is radiated into the cavity through the radiating plate 300, and because the projection of the feed rod 200 is completely located within the radiating plate 300, and there is a first distance between the projection and the peripheral sidewall of the radiating plate 300 (i.e., the area of ​​the radiating plate 300 is larger than the area of ​​the projection of the feed rod 200), compared to the linear radiation characteristics of existing radiating rods, the radiating plate 300 of the radio frequency antenna assembly of this application, as a planar radiator, has a more dispersed current distribution and a wider coverage area; furthermore, since the projection of the feed rod 200 on the radiating plate 300 falls completely within the radiating plate 300, the microwave energy... The planar carrier of the radiant plate 300 can achieve uniform coupling across the entire area, and then diffuse radiation along the entire surface of the radiant plate 300. This arrangement ensures that the energy coupling area covers the entire area of ​​the radiant plate 300, ensuring that the energy is fully converted into a planar microwave field. Microwave energy can achieve planar coupling and diffusion across the entire area through the radiant plate 300, avoiding the problem of energy concentration along the linear direction. Through the wide coverage characteristics of the planar radiation of the radiant plate 300, the microwave field is more evenly distributed in all areas of the inner pot, avoiding local energy concentration, ensuring that the heating of all parts of the food is more uniform and sufficient, and effectively reducing the occurrence of local overcooking or undercooking of food.

[0063] Furthermore, the outer conductor 120 is a sleeve, the inner conductor 110 is sleeved inside the sleeve, and a gap is provided between the inner conductor 110 and the inner wall of the sleeve to prevent contact between the inner conductor 110 and the outer conductor 120.

[0064] In other embodiments, refer to Figure 1 and Figure 6 As shown, the radiating plate 300 is a rectangular plate, and the axis of the feed rod 200 is located at the center of the rectangular plate.

[0065] In this embodiment, since the axis of the feed rod 200 is located at the center of the rectangular plate, that is, the axis of the feed rod 200 coincides with the geometric center of the rectangular plate, uniform coupling of microwave energy across the entire region can be achieved, reducing losses. The geometric center of the rectangular plate is the origin of its energy distribution equilibrium. When the axis of the feed rod 200 is centered, microwave energy can diffuse symmetrically from the center to the length and width of the rectangular plate, avoiding energy concentration on one side of the plate (such as the long or short side). This symmetrical coupling mode reduces the energy density difference in different regions of the rectangular plate, significantly reducing energy transmission losses inside the plate. Compared with an eccentric feed design, the energy coupling efficiency is improved.

[0066] Furthermore, it optimizes the symmetry of the microwave field distribution and improves heating uniformity: the radiation characteristics of the rectangular plate are directly related to the current distribution. The centered design of the axis allows the alternating current to be symmetrically distributed along the long and short axes of the rectangular plate, avoiding the problem of "unilateral radiation enhancement and unilateral radiation weakening" caused by current deviation. The microwave field excited in this way forms a symmetrical standing wave mode in the microwave oven cavity, which can effectively eliminate energy dead zones in the corners of the rectangular cavity, reduce the difference in microwave field strength in different areas of the cavity, and solve the problem of local overcooking of food caused by uneven field strength.

[0067] Furthermore, it ensures impedance matching stability, adapting to broadband microwave requirements. The impedance matching performance between the feed rod 200 and the radiating plate 300 depends on the balance of their energy interaction. The equivalent impedance value at the center of the rectangular plate is the most stable. When the axis is centered, the coupling impedance between the feed rod 200 and the rectangular plate can be stabilized at around 50Ω (the standard impedance of a microwave system), and the VSWR is controlled below 1.2. Even if the operating frequency of the microwave source fluctuates within the range of 2.4GHz-2.5GHz, the impedance matching accuracy can still be maintained at ±2Ω, which is far superior to the eccentric feed design, reducing energy reflection loss caused by frequency fluctuations.

[0068] The geometric center of the rectangular plate is its mechanical load-bearing equilibrium point. When the feed rod 200 is connected at this point, the assembly stress can be evenly distributed to the perimeter of the plate, avoiding "unilateral stress concentration" caused by eccentric connection. Under the vibration of microwave oven operation or the bumps of transportation, this symmetrical connection structure can control the maximum deformation of the rectangular plate, reduce the risk of coupling failure caused by plate deformation, and extend the service life of the antenna assembly.

[0069] In one embodiment, reference is made to... Figure 1 and Figure 2 As shown, the rectangular plate includes a first long side 310 and a first wide side 320. The length of the first long side 310 is greater than the length of the first wide side 320. The first long side 310 extends toward the inner wall of the inner liner at the feed rod 200 to form a grounding member 400.

[0070] The first long side 310 extends towards the inner wall of the inner liner to form a grounding component 400. That is, the radiating plate 300 and the grounding component 400 are integrally formed. The integrally formed grounding component 400 is in direct contact with the inner liner to build a low-impedance grounding path. It can quickly conduct away the high-frequency stray current (electromagnetic induction products) on the surface of the radiating plate 300, avoid the accumulation of stray current, and has low grounding contact resistance, strong stability, and no risk of loosening of additional connection nodes.

[0071] The grounding component 400 forms a closed shielding circuit with the inner liner, which can not only block the microwave leakage of the radiation plate 300 to the outside, but also isolate external interference signals from entering the microwave field of the inner liner; ensuring that the electromagnetic radiation leakage of the microwave oven meets the safety standards and will not interfere with the normal operation of surrounding home appliances.

[0072] The long edge of the rectangular radiant plate 300 is prone to forming a strong "edge field" due to current concentration. The grounding component 400 can dissipate the electric field accumulated at the edge through the grounding path, avoiding electric field breakdown of the air; eliminating electric arcing in humid and high-temperature environments, ensuring long-term stable operation of the radiant plate 300, and reducing the failure rate.

[0073] A stable ground plane is the basis for impedance matching of microwave components. The reliable connection between the grounding component 400 and the inner liner provides a fixed reference ground for the radiating plate 300, so that the energy coupling between the feed rod 200 and the radiating plate 300 forms an "input-radiation-grounding" closed loop. This improves the impedance matching accuracy, reduces energy reflection loss, and allows microwave energy to be radiated to the inner liner more fully.

[0074] In some embodiments, reference is made to Figure 1 and Figure 3 As shown, it also includes a mounting plate 500, which is used to be installed on the inner wall of the inner liner at the feed rod 200. The end of the grounding member 400 away from the radiation plate 300 is electrically connected to the inner liner through the mounting plate 500.

[0075] In this embodiment, the radiant plate 300 and the grounding component 400 are fixedly connected to the inner wall of the inner liner by the mounting plate 500, ensuring that the radiant plate 300 and the grounding component 400 are located inside the inner liner.

[0076] Specifically, the mounting plate 500 is a flange plate, and multiple first connection holes 600 are provided on the flange plate along the circumferential direction. Fasteners are used to connect to the inner wall of the inner liner by passing through the first connection holes 600. The fasteners can be bolts, snap-fit ​​components, etc.

[0077] The end of the grounding component 400 away from the radiation plate 300 is connected to the mounting plate 500. The connection method can be bolt connection, snap-fit ​​connection, etc. In this embodiment, the mounting plate 500 is provided with a second connection hole 700. The end of the grounding component 400 away from the radiation plate 300 is connected to the mounting plate 500 by a fastener passing through the second connection hole 700. The fastener can be a bolt, snap-fit ​​connection, etc.

[0078] Furthermore, the projections of the radiating plate 300 and the grounding component 400 toward the mounting plate 500 are both located within the mounting plate 500.

[0079] In this embodiment, the area of ​​the mounting plate 500 is larger than that of the radiation plate 300 and the grounding component 400, thereby ensuring that the mounting area is large enough and improving the stability of fixing the radiation plate 300 and the grounding component 400.

[0080] Furthermore, the mounting plate 500 is a flange plate, and the diameter of the flange plate is 65mm.

[0081] In some possible embodiments, refer to Figure 3 and Figure 4 As shown, the mounting plate 500 is provided with a through hole 510. The end of the feed rod 200 away from the inner conductor 110 passes through the through hole 510 and is connected to the radiation plate 300. There is a second gap between the feed rod 200 and the through hole 510, and a third gap between the radiation plate 300 and the mounting plate 500.

[0082] In this embodiment, the mounting plate 500 is installed on the inner wall of the inner liner at the feed rod 200. The feed rod 200 passes through the through hole 510 on the mounting plate 500 and is connected to the radiation plate 300. A second gap is ensured between the feed rod 200 and the through hole 510 to prevent the feed rod 200 from contacting the mounting plate 500.

[0083] There is a third gap between the radiating plate 300 and the mounting plate 500. The third gap provides an independent space for microwave radiation, allowing the microwave energy emitted by the radiating plate 300 to diffuse into the inner liner without obstruction, while avoiding interference from the mounting plate 500 to the microwave field.

[0084] In some possible embodiments, refer to Figure 2 and Figure 3 As shown, the radiant plate 300 is parallel to the mounting plate 500, and the mounting plate 500 is parallel to the inner wall of the inner liner at the feed rod 200.

[0085] In this embodiment, when the radiating plate 300 and the mounting plate 500 are parallel, the gap between them can be kept consistent throughout the entire radiating plate 300 (without local differences in width). A uniform gap can avoid microwave field distortion caused by geometric offset. If they are not parallel, the narrow gap area is prone to microwave absorption, and the wide gap area is prone to energy leakage. The parallel structure can ensure that the microwave radiation path is consistent and maintain the stability of the field distribution.

[0086] Furthermore, the electric field distribution at the edge of the radiating plate 300 is directly related to the distance from the mounting plate 500. Parallel arrangement can ensure that the distance from each edge of the radiating plate 300 to the mounting plate 500 is consistent, avoiding electric field breakdown caused by excessively close local distances.

[0087] In other possible embodiments, refer to Figure 3 and Figure 4 As shown, the diameter of the feed rod 200 ranges from 3mm to 5mm, and the distance of the third gap ranges from 4mm to 7mm.

[0088] In this embodiment, refer to Figure 4 As shown, Figure 4 In the diagram, D1 represents the third gap, and D2 represents the diameter of the feed rod 200. The diameter of the feed rod 200 ranges from 3mm to 5mm, meaning that the diameter of the feed rod 200 can be 3mm, 5mm, or any value between 3mm and 5mm, such as 3.5mm, 4mm, 4.5mm, etc. Setting the diameter of the feed rod 200 to 3mm to 5mm ensures impedance matching between the feed rod 200 and the microwave oven's operating frequency, and also guarantees the energy transmission efficiency and structural strength of the entire RF antenna assembly.

[0089] The third gap is the distance between the radiating plate 300 and the mounting plate 500, which ranges from 4mm to 7mm. That is, the distance between the radiating plate 300 and the mounting plate 500 can be 4mm, 7mm, or any value between 4mm and 7mm, such as 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, etc. Setting the distance between the radiating plate 300 and the mounting plate 500 to 4mm to 7mm can prevent microwave energy from being shielded and leaking, improve energy utilization, prevent electric field breakdown and arcing, and ensure the uniformity of radiation.

[0090] In another embodiment, reference is made to Figure 1 and Figure 6 As shown, the rectangular plate includes a first long side 310 and a first wide side 320. The length of the first long side 310 ranges from 40mm to 48mm, and the length of the first wide side 320 ranges from 26mm to 34mm.

[0091] In this embodiment, the length of the first long side 310 ranges from 40mm to 48mm, and the length of the first wide side 320 ranges from 26mm to 34mm, thereby adapting to microwave wavelengths, ensuring radiation uniformity, and optimizing impedance matching to reduce energy loss.

[0092] In another possible embodiment, refer to Figure 1 and Figure 6 As shown, the side of the grounding member 400 facing the mounting plate 500 includes a second long side 410 and a second wide side 420. The length of the second long side 410 is the same as the length of the first long side 310, and the length of the second wide side 420 ranges from 9 mm to 12 mm.

[0093] In this embodiment, the length of the second long side 410 of the grounding member 400 is the same as the length of the first long side 310, and the length of the second wide side 420 ranges from 9mm to 12mm, which increases the contact area of ​​grounding, making the grounding member 400 ground well, facilitating the continuity of grounding, and improving the reliability of grounding.

[0094] A second aspect of this application provides a cooking device, including an inner pot and a radio frequency antenna assembly of any of the above embodiments, wherein the radio frequency antenna assembly is disposed on the inner pot.

[0095] The cooking apparatus of this embodiment is provided with a radio frequency antenna assembly, which includes a connecting component 100, a feed rod 200, a radiating plate 300, and a grounding component 400. The connecting component 100 is located outside the inner pot of the cooking apparatus and includes an inner conductor 110 and an outer conductor 120. One end of the inner conductor 110 and one end of the outer conductor 120 are respectively used for electrical connection with a coaxial cable, and the other end of the outer conductor 120 is electrically connected to the inner pot. One end of the feed rod 200 is electrically connected to the other end of the inner conductor 110, and the other end of the feed rod 200 extends into the interior of the inner pot. The radiating plate 300 is electrically connected to the end of the feed rod 200 away from the inner conductor 110 and has a first gap with the inner wall of the inner pot. The projection of the feed rod 200 toward the radiating plate 300 is located inside the radiating plate 300, and there is a first distance between the projection and the peripheral sidewall of the radiating plate 300. One end of the grounding component 400 is electrically connected to the radiating plate 300, and the other end is electrically connected to the inner pot.

[0096] In the cooking device of this application, since microwave signals are radiated into the cavity through the radiating plate 300, and because the projection of the feed rod 200 is completely located within the radiating plate 300, and there is a first distance between the projection and the peripheral wall of the radiating plate 300 (i.e., the area of ​​the radiating plate 300 is larger than the area of ​​the projection of the feed rod 200), compared to the linear radiation characteristics of existing radiating rods, the radiating plate 300 of the radio frequency antenna assembly of this application, as a planar radiator, has a more dispersed current distribution and a wider coverage area; furthermore, since the projection of the feed rod 200 on the radiating plate 300 falls completely within the radiating plate 300, microwave energy can... By relying on the planar carrier of the radiant plate 300, uniform coupling is achieved throughout the entire area, and then the radiation diffuses along the entire surface of the radiant plate 300. This arrangement ensures that the energy coupling area covers the entire area of ​​the radiant plate 300, ensuring that the energy is fully converted into a planar microwave field. Microwave energy can achieve full-area planar coupling and diffusion through the radiant plate 300, avoiding the problem of energy concentration along the linear direction. Through the wide coverage characteristics of the planar radiation of the radiant plate 300, the microwave field is more evenly distributed in all areas of the inner pot, avoiding local energy concentration, ensuring that the heating of all parts of the food is more uniform and sufficient, and effectively reducing the occurrence of local overcooking or undercooking of food.

[0097] It should be noted that the cooking equipment in this application embodiment can be a microwave oven, a microwave steam oven, a microwave air fryer, an embedded microwave cooking equipment, a medical / special scene heating equipment, a high-frequency induction assisted cooking equipment, etc.

[0098] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0099] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A radio frequency antenna assembly, characterized in that, include: A connecting assembly (100) is located outside the inner pot of the cooking appliance, including an inner conductor (110) and an outer conductor (120), with a gap formed between the inner conductor (110) and the outer conductor (120), the outer conductor (120) being used to electrically connect the outer conductor of a coaxial cable to the inner pot; Feed rod (200), inner conductor (110) is used to electrically connect the center conductor of the coaxial cable to one end of the feed rod (200), and the other end of the feed rod (200) extends into the interior of the inner liner; A radiating plate (300) is electrically connected to one end of the feed rod (200) away from the inner conductor (110), and has a first gap between it and the inner wall of the inner liner at the feed rod (200). The projection of the feed rod (200) toward the radiating plate (300) is located inside the radiating plate (300), and there is a first distance between the projection and the peripheral sidewall of the radiating plate (300). The grounding component (400) is electrically connected at one end to the radiating plate (300) and at the other end to the inner liner.

2. The radio frequency antenna assembly according to claim 1, characterized in that, The radiating plate (300) is a rectangular plate, and the axis of the feed rod (200) is located at the center of the rectangular plate.

3. The radio frequency antenna assembly according to claim 2, characterized in that, The rectangular plate includes a first long side (310) and a first wide side (320), the length of the first long side (310) is greater than the length of the first wide side (320), and the first long side (310) extends toward the inner wall of the inner liner at the feed rod (200) to form the grounding member (400).

4. The radio frequency antenna assembly according to claim 3, characterized in that, It also includes a mounting plate (500) for mounting on the inner wall of the inner liner at the feed rod (200), and the end of the grounding member (400) away from the radiation plate (300) is electrically connected to the inner liner through the mounting plate (500).

5. The radio frequency antenna assembly according to claim 4, characterized in that, The mounting plate (500) is provided with a through hole (510), and the end of the feed rod (200) away from the inner conductor (110) passes through the through hole (510) and is connected to the radiation plate (300). There is a second gap between the feed rod (200) and the through hole (510), and there is a third gap between the radiation plate (300) and the mounting plate (500).

6. The radio frequency antenna assembly according to claim 5, characterized in that, The radiant plate (300) is parallel to the mounting plate (500), and the mounting plate (500) is parallel to the inner wall of the inner liner at the feed rod (200).

7. The radio frequency antenna assembly according to claim 6, characterized in that, The diameter of the feed rod (200) ranges from 3 mm to 5 mm, and the distance of the third gap ranges from 4 mm to 7 mm.

8. The radio frequency antenna assembly according to any one of claims 3 to 7, characterized in that, The length of the first long side (310) ranges from 40 mm to 48 mm, and the length of the first wide side (320) ranges from 26 mm to 34 mm.

9. The radio frequency antenna assembly according to any one of claims 4 to 7, characterized in that, The grounding member (400) facing the mounting plate (500) includes a second long side (410) and a second wide side (420), the length of the second long side (410) is the same as the length of the first long side (310), and the length of the second wide side (420) ranges from 9 mm to 12 mm.

10. A cooking device, characterized in that, include: Inner liner; The radio frequency antenna assembly as described in any one of claims 1 to 9, wherein the radio frequency antenna assembly is disposed on the inner liner.

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