Magnetron and microwave appliance

Abstract

Disclosed are a magnetron (100) and a microwave appliance. The magnetron (100) comprises a cathode emission system and an anode resonant system (12); the cathode emission system comprises a cathode (10); the anode resonant system (12) comprises an anode cylinder (14) and a plurality of anode blades (16); the cathode (10) and the anode blades (16) are located in the anode cylinder (14); each anode blade (16) comprises a first end surface (32) and a second end surface (34) which face away from each other in a first direction; the first end surface (32) is connected to the anode cylinder (14); the second end surface (34) is spaced apart from the cathode (10); and the second end surface (34) is recessed toward the corresponding anode blade (16).

Description

Magnetrons and Microwave Appliances

[0001] Priority information

[0002] This application claims priority and benefits to patent application No. 202411750501.1, filed with the China National Intellectual Property Administration on November 29, 2024, the entire contents of which are incorporated herein by reference as if copied herein. Technical Field

[0003] This application relates to the field of household appliance technology, specifically to a magnetron and microwave appliance. Background Technology

[0004] In related technologies, microwave appliances include magnetrons, which are used to generate microwaves. These microwaves can be fed into the cavity of the microwave appliance to heat food. However, current magnetrons have a long start-up time, which can easily cause high-order harmonics. These high-order harmonics have large amplitudes and can be synchronously coupled out through the antenna, ultimately becoming a problem that plagues EMC (Electromagnetic Compatibility). Summary of the Invention

[0005] This application provides a magnetron and a microwave appliance to solve at least one of the above-mentioned technical problems.

[0006] One embodiment of the magnetron in this application includes:

[0007] A cathode emission system, the cathode emission system comprising a cathode, and;

[0008] An anode resonant system includes an anode cylinder and a plurality of anode blades. The cathode and the anode blades are located inside the anode cylinder. The anode blades include a first end face and a second end face facing away from each other in a first direction. The first end face is connected to the anode cylinder, and the second end face is spaced apart from the cathode. The second end face is concave inward into the anode blade.

[0009] In the aforementioned magnetron, the second end face is concave towards the anode blade, which makes the high-frequency field penetrating from the anode resonant system stronger and the electrons enter the phase selection and focusing faster, thereby reducing the start-up time of the magnetron.

[0010] In some embodiments, the plurality of anode blades are uniformly arranged circumferentially along the anode cylinder, and the cathode is located in the space enclosed by the plurality of second end faces of the plurality of anode blades, forming an interaction space between the cathode and the plurality of second end faces.

[0011] In some embodiments, the anode blade includes a third end face and a fourth end face opposite to each other along a second direction, the third end face connecting the first end face and the second end face, the fourth end face connecting the first end face and the second end face, and the two endpoints of the second end face along the second direction respectively connecting to the third end face and the fourth end face.

[0012] In some embodiments, the second end face is arc-shaped, isosceles trapezoidal, or V-shaped.

[0013] In the above-mentioned magnetron, the second end face has a simple structure and is easy to manufacture, which can reduce the cost of the magnetron to a certain extent.

[0014] In some embodiments, the end face of the second end is symmetrically arranged along the central axis of the anode blade.

[0015] In the above-mentioned magnetron, the second end face is symmetrically arranged along the central axis of the anode blade, which allows electrons to be evenly distributed after reaching the anode blade.

[0016] In some embodiments, a first mounting groove and a second mounting groove are provided on the third end face, the first mounting groove being closer to the second end face than the second mounting groove, and a third mounting groove is provided on the fourth end face, the first mounting groove and the third mounting groove being correspondingly arranged in the second direction.

[0017] In the aforementioned magnetron, the third and fourth end faces of the anode blades are provided with mounting grooves for easy installation.

[0018] In some embodiments, the magnetron further includes a cross-link, which includes a first cross-link, a second cross-link, and a third cross-link, wherein the first cross-link is installed in the first mounting slot, the second cross-link is installed in the second mounting slot, and the third cross-link is installed in the third mounting slot.

[0019] The above-mentioned magnetron can improve the distribution of magnetic field lines and effectively improve the EMC (electromagnetic compatibility) of the magnetron.

[0020] In some embodiments, the magnetron further includes a heat dissipation system disposed on the outside of the anode cylinder.

[0021] In some embodiments, the heat dissipation system comprises a plurality of heat dissipation components arranged axially along the anode cylinder. Each heat dissipation component includes a cylindrical portion and a heat dissipation portion. The cylindrical portion is sleeved on the outside of the anode cylinder, and the heat dissipation portion is connected to the side of the cylindrical portion opposite to the anode cylinder. The heat dissipation portion is bent.

[0022] In some embodiments, the heat dissipation portion is provided on both sides of the cylindrical portion along the radial direction.

[0023] The aforementioned magnetrons can further improve heat dissipation efficiency, ensure magnetron performance, and extend magnetron lifespan.

[0024] One embodiment of this application includes a microwave appliance comprising a magnetron according to any of the above embodiments.

[0025] In the aforementioned microwave electrical appliance, by adjusting the shape of the second end facing the concave part of the anode blade, the high-frequency field penetrating from the anode resonant system can be made stronger, and the electrons can enter the phase selection and focusing faster, thereby reducing the start-up time of the magnetron.

[0026] Additional aspects and advantages of the embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0029] Figure 1 is a cross-sectional structural diagram of the magnetron according to an embodiment of this application;

[0030] Figure 2 is a top view of the anode resonant system according to an embodiment of this application;

[0031] Figures 3 to 5 are schematic diagrams of the structure of the anode blades according to embodiments of this application;

[0032] Figure 6 is a schematic diagram of the EMC simulation results of the magnetron according to the embodiment of this application;

[0033] Figure 7 is a schematic diagram of the structure of the anode blade in the related technology;

[0034] Figure 8 is a schematic diagram of the EMC simulation results of magnetrons in related technologies.

[0035] Explanation of key component reference numerals: Magnetron-100, Cathode-10, Anode resonant system-12, Anode cylinder-14, Anode blade-16, Interlocking ring-18, First interlocking ring-20, Second interlocking ring-22, Third interlocking ring-24, Heat sink-26, Cylinder section-28, Heat sink section-30, First mounting slot-40, Second mounting slot-42, Third mounting slot-44, Heat dissipation system-46, Energy output system-48, Interaction space-50, Upper magnet-52, Lower magnet-54. Detailed Implementation

[0036] The embodiments of this application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0037] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] This disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described herein. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0041] Please refer to Figures 1 to 5. An embodiment of this application provides a magnetron including a cathode emitting system and an anode resonant system 12. The cathode emitting system includes a cathode 10. The anode resonant system 12 includes an anode cylinder 14 and a plurality of anode blades 16. The cathode 10 and the anode blades 16 are located within the anode cylinder 14. Each anode blade 16 includes a first end face 32 and a second end face 34 facing away from each other along a first direction. The first end face 32 is connected to the anode cylinder 14, and the second end face 34 is spaced apart from the cathode 10. The second end face 34 is concave inwards towards the anode blade 16.

[0042] In the aforementioned magnetron, the second end face 34 is recessed into the anode blade 16, which makes the high-frequency field penetrating from the anode resonant system 12 stronger and the electrons enter the phase selection and focusing faster, thereby reducing the start-up time of the magnetron 100.

[0043] Specifically, a microwave oven is an appliance that uses microwaves to heat food. Microwaves are a type of electromagnetic wave. Microwave appliances include, but are not limited to, microwave ovens, microwave-steam-grill combos, and integrated cooktops. A microwave appliance also includes a power supply, control circuitry, waveguide, stirring antenna, and cooking cavity. The power supply provides approximately 4000 volts of high voltage to the magnetron 100. Under the excitation of the power supply, the magnetron 100 continuously generates microwaves. The magnetron 100 is connected to the stirring antenna via the waveguide to transmit microwaves to the stirring antenna. Then, as the stirring antenna rotates, it emits microwaves to various parts of the cooking cavity, heating the food inside.

[0044] Among them, the magnetron 100 is an important component for generating microwaves. Under the combined force of the electric and magnetic fields, the electrons generated by the cathode emission system undergo self-excitation in the anode resonant system 12. Under the action of the high-frequency field penetrating from the anode resonant system 12, they are phase-selected and focused, forming continuously rotating electron spokes. At this time, high-frequency energy is continuously generated and coupled out through the energy output system 48, and the magnetron 100 thus enters a stable output state.

[0045] The start-up time of the magnetron 100 refers to the time required for the π mode to go from initial self-excitation to reaching a stable output state. A shorter time indicates stronger competition from the π mode, weaker competition from other modes, less noise generated during the process, and naturally, better EMC (Electromagnetic Compatibility) for the magnetron. The anode resonant system 12 of the magnetron is the main factor determining the start-up time.

[0046] Referring to Figure 2, the anode resonant system 12 includes an anode cylinder 14 and multiple anode blades 16. The multiple anode blades 16 are disposed inside the anode cylinder 14 and arranged radially and uniformly around the axis of the anode cylinder 14. Each anode blade 16 includes a first end face 32 and a second end face 34. The first end face 32 is fixedly connected to the inner wall of the anode cylinder 14 (e.g., by welding). The second end face 34 is suspended above the axis of the anode cylinder 14, and can serve as the working end face of the anode blade. In Figure 2, the first direction is left-right, and the second direction is up-down; that is, the left end face of the anode blade 16 is suspended above the axis of the anode cylinder 14, and the right end face is connected to the inner wall of the anode cylinder 14.

[0047] In this way, the uniformly arranged multiple anode blades 16 can make the shape of the multiple second end faces 34 more complete and smooth, and the electric field distribution formed between the anode blades 16 and the cathode is more uniform.

[0048] Please refer to Figure 7. In related technologies, the working end face of the anode blade 150 adopts an I-shaped planar structure.

[0049] Specifically, in the structure shown in Figure 7, the magnetron's oscillation start-up time averages around 68 ns (nanoseconds). A 68 ns start-up time is very fast for microwave appliance users, with no noticeable delay. However, for the magnetron, this short 68 ns period can introduce various high-order harmonics. The slightly stronger harmonics, such as the 5th and 6th harmonics, will be synchronously coupled out through the output antenna, ultimately becoming a problem that plagues EMC (Electronic Compatibility). Figure 8 shows a schematic diagram of the EMC simulation results for a magnetron in related technologies.

[0050] In this embodiment, the second end face 34 is recessed into the anode blade 16, which strengthens the high-frequency field penetrating the anode resonant system 12 and accelerates the electron entry into phase selection and focusing, thereby reducing the start-up time of the magnetron 100, resulting in a cleaner output spectrum and better EMC. Figure 6 is a schematic diagram of the EMC simulation results of the magnetron according to this embodiment. As can be seen from Figures 6 and 8, the start-up time of the magnetron according to this embodiment is shorter than that of magnetrons in related technologies. In one example, the average start-up time of the magnetron 100 according to this embodiment is 50 ns, thus the magnetron 100 of this application can achieve a reduction in start-up time without increasing production costs.

[0051] In some embodiments, a plurality of anode blades 16 are uniformly arranged along the circumference of the anode cylinder 14, and the cathode 10 is located in the space enclosed by a plurality of second end faces 34 of the plurality of anode blades 16, forming an interaction space 50 between the cathode 10 and the plurality of second end faces 34.

[0052] Thus, electrons can generate high-frequency energy within the interaction space 50.

[0053] Specifically, the interaction space 50 is roughly annular, with the cathode 10 on the inner side and multiple anode blades 16 on the outer side. Referring to Figure 2, the uniform arrangement of multiple anode blades 16 along the circumference of the anode cylinder 14 can mean that the included angle between two adjacent anode blades 16 is the same in the 360-degree circumferential direction of the anode cylinder 14.

[0054] The working principle of the magnetron 100 is roughly as follows: When the magnetron 100 is working, as shown in Figure 1, a DC voltage of several kilovolts is applied between the cathode 10 and the anode blade 16. Simultaneously, the upper magnet 52 and the lower magnet 54 provide a magnetic field to the interaction space 50. The DC electric field and DC magnetic field within the interaction space 50 are perpendicular to each other. Electrons emitted from the cathode 10 are accelerated by the electric field and deflected by the magnetic field, undergoing stable oscillating motion within the interaction space 50. The electron velocity is proportional to the ratio E / B (E is the electric field strength, and B is the magnetic flux density). The energy gained by the electron stream emitted from the cathode 10 from the electric field in the interaction space 50 is transferred to a high-frequency field under certain conditions and output externally through the energy output system 48.

[0055] In some embodiments, please refer to Figures 3 to 5. The anode blade 16 includes a third end face 36 and a fourth end face 38 that are opposite to each other along a second direction. The third end face 36 is connected to the first end face 32 and the second end face 34. The fourth end face 38 is connected to the first end face 32 and the second end face 34. The two endpoints of the second end face 34 along the second direction are respectively connected to the third end face 36 and the fourth end face 38.

[0056] Therefore, the connection between the second end face 34 and the third end face 36 can be made into a sharper part, as can the connection between the second end face 34 and the fourth end face 38, which helps to reduce the start-up time of the magnetron 100.

[0057] Specifically, in the embodiments shown in Figures 3 to 5, the first direction is the left-right direction, the second direction is the up-down direction, the first end face 32 is the right end face of the anode blade 16, the second end face 34 is the left end face of the anode blade 16, the third end face 36 is the upper end face of the anode blade 16, and the fourth end face 38 is the lower end face of the anode blade 16.

[0058] The two endpoints of the second end face 34 along the second direction are the upper endpoint and the lower endpoint, respectively. The upper endpoint is connected to the third end face 36, and the lower endpoint is connected to the fourth end face 38.

[0059] The second end face is concave inward towards the anode blade 16, and the two endpoints of the second end face 34 along the second direction are connected to the third end face 36 and the fourth end face 38 respectively. This makes the connection between the second end face 34 and the third end face 36, as well as the connection between the second end face 34 and the fourth end face 38, a relatively sharp part. This can make the high-frequency field penetrating the resonant system stronger, and the electrons enter the phase selection and focusing faster, thereby reducing the start-up time of the magnetron 100.

[0060] In some embodiments, the second end face 34 is arc-shaped, isosceles trapezoidal, or V-shaped.

[0061] Therefore, the shape and structure of the second end face are simple and easy to manufacture, which can reduce the cost of the magnetron 100 to a certain extent.

[0062] Specifically, referring to Figure 3, in one embodiment, the second end face 34 is arc-shaped. The arc shape includes, but is not limited to, circular arcs, elliptical arcs, parabolic arcs, hyperbolic arcs, or shapes corresponding to other quadratic curves. The second end face 34 can be composed of the same arc-shaped surface, or it can be formed by connecting multiple surfaces of different shapes end to end; this application does not specifically limit this. In Figure 3, the second end face 34 is an arc shape intersecting the minor axis of an ellipse.

[0063] Referring to Figure 4, in one embodiment, the second end face 34 is an isosceles trapezoid. The size of the base angle A of the isosceles trapezoid can be specifically determined according to actual needs, and this application does not impose specific limitations on it.

[0064] Referring to Figure 5, in one embodiment, the second end face 34 is V-shaped. The size of the apex angle B of the V-shape can be determined according to specific actual needs, and this application does not impose specific limitations on it.

[0065] Arc, isosceles trapezoid, or V-shaped shapes are simple, easy to manufacture, and have a high yield, which can reduce the cost of magnetron 100.

[0066] In some embodiments, the second end face 34 is symmetrically arranged along the central axis L of the anode blade 16.

[0067] This allows electrons to be emitted from the cathode 10, and under the influence of electric and magnetic fields, their motion changes from chaotic to orderly, accelerating the process and further reducing the start-up time of the magnetron.

[0068] Specifically, in the embodiments shown in Figures 3 to 5, the central axis L of the anode blade 16 is the central axis of the anode blade 16 along the vertical direction. The second end face 34 is symmetrically arranged along the central axis L of the anode blade 16, so that the upper and lower halves of the second end face 34 have the same shape. The upper and lower halves have basically the same electric field distribution as the cathode, and their effects on electrons are also basically the same, thereby accelerating the speed at which the electron motion state changes from chaotic to orderly, which can further reduce the start-up time of the magnetron.

[0069] In some embodiments, referring to Figures 2 to 5, a first mounting groove 40 and a second mounting groove 42 are provided on the third end face 36. The first mounting groove 40 is closer to the second end face 34 than the second mounting groove 42. A third mounting groove 44 is provided on the fourth end face 38. The first mounting groove 40 and the third mounting groove 44 are correspondingly arranged in the second direction.

[0070] The anode resonant system 12 includes a first interlocking ring 20, a second interlocking ring 22 and a third interlocking ring 24. The first interlocking ring 20 is installed in the first mounting groove 40, the second interlocking ring 22 is installed in the second mounting groove 42, and the third interlocking ring 24 is installed in the third mounting groove 44.

[0071] This can improve the distribution of magnetic field lines, enhance the matching degree between the magnetic field and the electric field, and further reduce the start-up time of the magnetron 100.

[0072] Specifically, in the embodiment shown in FIG1, the arrangement of the first mounting groove 40, the second mounting groove 42 and the third mounting groove 44 facilitates better installation of the connecting ring on the anode blade 16.

[0073] The installation of the anode blades 16 and the interlocking ring can improve the distribution of magnetic field lines, enhance the matching degree between the magnetic field and the electric field, thereby reducing the start-up time of the magnetron 100, effectively increasing the frequency interval between the working mode and adjacent interference modes, improving EMC, and thus effectively preventing the magnetron from emitting unnecessary noise when it is working.

[0074] In some embodiments, referring to FIG1, the magnetron 100 further includes the heat dissipation system 46, which is sleeved on the outside of the anode cylinder 14.

[0075] This allows for heat dissipation of the magnetron 100, thereby ensuring its performance and extending its lifespan to a certain extent.

[0076] Specifically, during the operation of the magnetron 100, due to its high output power, the magnetron 100 generates a large amount of heat, which leads to a high temperature rise in the anode cylinder 14. The high temperature will seriously affect the working performance and service life of the magnetron 100, so it is necessary to cool down the magnetron 100.

[0077] The anode blades 16 are located within and connected to the anode cylinder 14, which is connected to the heat dissipation system 46. Heat from the anode blades 16 can be transferred to the heat dissipation system via the anode cylinder 14 for dissipation, ensuring the magnetron 100 operates within its normal temperature range, guaranteeing its performance, and extending its lifespan. The heat dissipation system 46 can employ air cooling, water cooling, or a combination of both; no specific limitation is specified here.

[0078] This application does not specify the material of the heat dissipation system 46. In one example, the heat dissipation system 46 may be made of copper, aluminum, or aluminum alloy.

[0079] In some embodiments, referring to FIG1, the heat dissipation system 46 includes a plurality of heat dissipation components 26, which are arranged axially along the anode cylinder 14. Each heat dissipation component 26 includes a cylindrical portion 28 and a heat dissipation portion 30. The cylindrical portion 28 is sleeved on the outside of the anode cylinder 14, and the heat dissipation portion 30 is connected to the side of the cylindrical portion 28 away from the anode cylinder 14. The heat dissipation portion 30 is bent.

[0080] This increases the heat dissipation area of ​​the heat dissipation system 46.

[0081] Specifically, on the one hand, multiple heat sinks 26 can be arranged sequentially along the axial direction of the anode cylinder 14. In Figure 1, the axial direction of the anode cylinder 14 is vertical, meaning the multiple heat sinks 26 are arranged sequentially in the vertical direction. Multiple cylindrical portions 28 are fitted onto and connected to the anode cylinder 14 along its axial direction, allowing a larger surface area of ​​the anode cylinder 14 to connect with the cylindrical portions 28, increasing the heat transfer area between the anode cylinder 14 and the cylindrical portions 28. In Figure 1, the axial direction of the anode cylinder 14 is parallel to the axial direction of the cylindrical portions 28, and both the axial direction of the anode cylinder 14 and the cylindrical portions 28 are vertical. The number of heat sinks 26 is five. It is understood that this application does not specifically limit the number of heat sinks 26.

[0082] On the other hand, the heat dissipation part 30 is connected to the side of the cylinder 28 away from the anode cylinder 14. The heat from the anode blades 16 can be transferred to the anode cylinder 14, which can then transfer heat to the cylinder 28, which in turn can transfer heat to the heat dissipation part 30. The bent heat dissipation part 30 increases the heat dissipation area of ​​the heat dissipation system. Moreover, during the heat transfer process, some of the heat will also be dissipated.

[0083] In summary, the structure of the heat dissipation system increases the heat dissipation area, further ensuring the working performance of the magnetron 100 and extending its service life.

[0084] The heat dissipation portion 30 may have at least one bend. In Figure 1, there are five heat dissipation elements 26, some of which have three bends in their heat dissipation portion 30, while others have four bends. It is understood that this application does not specifically limit the number of heat dissipation portions 30, heat dissipation elements 26, and bends.

[0085] Furthermore, after the magnetron 100 has been used for a period of time, impurities and dust may accumulate on the surface of the heat sink 30, leading to a decrease in heat dissipation efficiency. The more curved surface of the heat sink 30 can reduce heat accumulation, thus maintaining good heat dissipation and extending its lifespan. Simultaneously, the more curved surface of the heat sink 30 can reduce airflow obstruction, allowing for smoother airflow and improving heat dissipation. Therefore, the curved heat sink 30 can improve airflow and enhance cooling performance.

[0086] In some embodiments, heat dissipation portions 30 are provided on both radial sides of the cylindrical portion 28.

[0087] This improves the heat dissipation efficiency of the magnetron 100.

[0088] Specifically, in Figure 1, the radial direction of the cylinder 28 is parallel to the radial direction of the anode cylinder 14. The radial direction of the cylinder 28 is along the left and right directions. The two sides of the cylinder 28 along the radial direction can be the left and right sides of the cylinder 28. The left and right sides of the cylinder 28 are provided with heat dissipation parts 30, so that the heat of the cylinder 28 can be dissipated from the left and right sides to the heat dissipation parts 30.

[0089] During the operation of the magnetron 100, the large amount of heat received by the cylinder 28 from the anode cylinder 14 can be dissipated through the heat dissipation section 30. The cylinder 28 is provided with heat dissipation sections 30 on both sides along the radial direction, which increases the heat dissipation area and further improves the heat dissipation efficiency of the magnetron 100, ensuring the working performance of the magnetron 100 and extending the service life of the magnetron 100.

[0090] In summary, the structure of the heat sink 26, including the cylindrical part 28 and the heat sink 30, increases the heat dissipation area of ​​the magnetron 100, further ensuring the working performance of the magnetron 100 and extending its service life.

[0091] One embodiment of this application of a microwave appliance includes the magnetron 100 of any of the above embodiments.

[0092] In the aforementioned microwave appliance, the second end face 34 is recessed into the anode blade 16, which makes the high-frequency field penetrating from the anode resonant system stronger and the electrons enter the phase selection and focusing faster, thereby reducing the start-up time of the magnetron.

[0093] Specifically, microwave appliances include, but are not limited to, microwave ovens, microwave steam ovens, microwave-steam-grill combos, and integrated cooktops.

[0094] Microwave appliances may also include a power supply, control circuit, waveguide, stirring antenna, and cooking cavity. The waveguide connects the magnetron 100 and the stirring antenna. The microwaves output by the magnetron 100 can enter the waveguide, which transmits the microwaves to the antenna. The antenna feeds the microwaves into the cooking cavity of the microwave appliance to heat the food inside the cooking cavity.

[0095] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0096] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A magnetron, characterized in that, include: A cathode emission system, the cathode emission system comprising a cathode, and; An anode resonant system includes an anode cylinder and a plurality of anode blades. The cathode and the anode blades are located inside the anode cylinder. The anode blades include a first end face and a second end face facing away from each other in a first direction. The first end face is connected to the anode cylinder, and the second end face is spaced apart from the cathode. The second end face is concave inward into the anode blade.

2. The magnetron according to claim 1, characterized in that, The plurality of anode blades are uniformly arranged along the circumference of the anode cylinder, and the cathode is located in the space enclosed by the plurality of second end faces of the plurality of anode blades, forming an interaction space between the cathode and the plurality of second end faces.

3. The magnetron according to claim 1 or 2, characterized in that, The anode blade includes a third end face and a fourth end face that are opposite to each other along a second direction. The third end face connects the first end face and the second end face, and the fourth end face connects the first end face and the second end face. The two endpoints of the second end face along the second direction are respectively connected to the third end face and the fourth end face.

4. The magnetron according to any one of claims 1-3, characterized in that, The second end face is arc-shaped, isosceles trapezoidal, or V-shaped.

5. The magnetron according to any one of claims 1-4, characterized in that, The second end face is symmetrically arranged along the central axis of the anode blade.

6. The magnetron according to claim 3, characterized in that, A first mounting groove and a second mounting groove are provided on the third end face. The first mounting groove is closer to the second end face than the second mounting groove. A third mounting groove is provided on the fourth end face. The first mounting groove and the third mounting groove are correspondingly arranged in the second direction. The anode resonant system includes a first cross-link, a second cross-link, and a third cross-link. The first cross-link is installed in the first mounting slot, the second cross-link is installed in the second mounting slot, and the third cross-link is installed in the third mounting slot.

7. The magnetron according to claim 1, characterized in that, The magnetron also includes a heat dissipation system, which is sleeved on the outside of the anode cylinder.

8. The magnetron according to claim 7, characterized in that, The heat dissipation system comprises multiple heat dissipation components arranged axially along the anode cylinder. Each heat dissipation component includes a cylindrical portion and a heat dissipation portion. The cylindrical portion is sleeved on the outside of the anode cylinder, and the heat dissipation portion is connected to the side of the cylindrical portion opposite to the anode cylinder. The heat dissipation portion is bent.

9. The magnetron according to claim 8, characterized in that, The heat dissipation section is provided on both sides of the cylindrical section along the radial direction.

10. A microwave electrical appliance, characterized in that, Includes the magnetron according to any one of claims 1-9.

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