Tube core of magnetron, magnetron and microwave electric appliance

Abstract

The invention discloses a tube core of a magnetron, the magnetron and a microwave electric appliance. According to the embodiment of the invention, the tube core of the magnetron comprises an anode part which comprises an anode cylinder, and the interior of the anode cylinder is provided with an interaction space; the cathode component comprises a lamp filament, and the lamp filament is located in the anode cylinder; the magnetic pole component comprises a first magnetic pole and a second magnetic pole, the first magnetic pole and the second magnetic pole are arranged at the two ends of the anode cylinder in the first direction respectively, and the first magnetic pole and the second magnetic pole are different in shape and structure. In the tube core of the magnetron, the first magnetic pole and the second magnetic pole have different shapes and structures, so that the magnetic field distribution of the interaction space can be changed through the magnetic pole structures, more electrons in the interaction space are in steady-state motion, the purpose of energy exchange is achieved, the generation of stray electrons is reduced, and the noise emitted outwards by the magnetron is reduced.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a magnetron core, a magnetron, and a microwave appliance. Background Technology

[0002] In related technologies, microwave ovens include a magnetron, which generates microwaves to heat food when it operates. Current magnetron designs only consider improving output efficiency without adequately addressing noise suppression, causing microwave ovens using this type of magnetron to fail electromagnetic compatibility (EMC) tests. Summary of the Invention

[0003] The present invention provides a magnetron die, a magnetron, and a microwave appliance to solve at least one of the above-mentioned technical problems.

[0004] A magnetron die according to an embodiment of the present invention includes:

[0005] An anode component, the anode component including an anode cylinder, the anode cylinder having an interaction space inside;

[0006] A cathode component, the cathode component including a filament located inside the anode cylinder, and;

[0007] A magnetic pole component, comprising a first magnetic pole and a second magnetic pole, wherein the first magnetic pole and the second magnetic pole are respectively disposed at both ends of the anode cylinder along a first direction, and the first magnetic pole and the second magnetic pole have different shapes and structures.

[0008] In the core of the aforementioned magnetron, the first and second magnetic poles have different shapes and structures. Therefore, the magnetic field distribution in the interaction space can be changed by altering the magnetic pole structure, so that more electrons in the interaction space are in steady-state motion, achieving the purpose of energy exchange, reducing the generation of stray electrons, and lowering the noise emitted by the magnetron.

[0009] In some implementations, the angle of the first magnetic pole is different from the angle of the second magnetic pole.

[0010] In some embodiments, the angle of the first magnetic pole is 62° to 68°, and the angle of the second magnetic pole is 69° to 84°.

[0011] In some embodiments, the angle of the first magnetic pole is K2, the angle of the second magnetic pole is A2, and 0.77≤K2 / A2≤0.94.

[0012] In some embodiments, the flat surface length of the first magnetic pole is different from that of the second magnetic pole.

[0013] In some embodiments, the flat surface length of the first magnetic pole is 11 mm to 12 mm, and the flat surface length of the second magnetic pole is 12.5 mm to 15 mm.

[0014] In some embodiments, the anode component includes a plurality of blades located within the anode cylinder, the plurality of blades being an interaction space with the filament, and the distance between the first magnetic pole and the blades being not equal to the distance between the second magnetic pole and the blades.

[0015] In some embodiments, the distance between the first magnetic pole and the blade is 1.55 mm to 1.75 mm, and the distance between the second magnetic pole and the blade is 1.85 mm to 1.95 mm.

[0016] In some embodiments, the diameter of the central hole of the first magnetic pole is the same as the diameter of the central hole of the second magnetic pole, and the diameter of the central hole is 8.6 mm to 9.3 mm.

[0017] One embodiment of the magnetron of the present invention includes the die of any of the above embodiments.

[0018] A microwave appliance according to an embodiment of the present invention includes the magnetron of the above embodiment.

[0019] In the aforementioned magnetron and microwave appliances, the first and second magnetic poles have different shapes and structures. Therefore, the magnetic field distribution in the interaction space can be changed by altering the magnetic pole structure, so that more electrons in the interaction space are in steady-state motion, achieving the purpose of energy exchange, reducing the generation of stray electrons, and lowering the noise emitted by the magnetron.

[0020] Additional aspects and advantages of the invention 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 the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional schematic diagram of the magnetron according to an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional schematic diagram of the core of the magnetron according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram showing the dimensions of the core of the magnetron according to an embodiment of the present invention;

[0025] Figure 4 A schematic diagram of the electronic spokes (simulation results) of the magnetron operating stably according to an embodiment of the present invention;

[0026] Figure 5 This is one of the schematic diagrams of the main wave waveform of the magnetron according to an embodiment of the present invention;

[0027] Figure 6 This is a second schematic diagram of the main wave waveform of the magnetron according to an embodiment of the present invention;

[0028] Figure 7 A schematic diagram of the electronic spokes (simulation results) for stable operation of the magnetron in related technologies;

[0029] Figure 8 This is a schematic diagram of the main wave waveform of a magnetron in related technologies.

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

[0031] The magnetron 100, the core 12, the bracket 14, the input power supply assembly 16, the heat dissipation component 18, the anode component 20, the cathode component 22, the output component 24, the magnetic pole component 26, the anode cylinder 28, the blade 30, the large cross-link 32, the small cross-link 34, the antenna 36, ​​the interaction space 38, the filament 40, the first magnetic pole 42, the second magnetic pole 44, the first permanent magnet 45, and the second permanent magnet 47, wherein the magnetic pole includes an edge portion 46, a connecting portion 48, a middle portion 50, and a central hole 52. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below. Examples of these embodiments 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 the present invention, and should not be construed as limiting the present invention.

[0033] In the description of this invention, 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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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 of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] In this invention, unless otherwise explicitly 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 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 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.

[0036] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. 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, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0037] Please refer to Figures 1 to 3 The magnetron 100 provided in this embodiment of the invention includes a die 12, a bracket 14, an input power assembly 16, and a heat dissipation component 18. The input power assembly 16 is disposed above the bracket 14, and the heat dissipation component 18 is disposed between the inner sidewall of the bracket 14 and the outer sidewall of the die 12.

[0038] The die 12 includes an anode component 20, a cathode component 22, an output component 24, and a magnetic pole component 26 forming a magnetic circuit. The anode component 20 includes an anode cylinder 28, multiple blades 30, a large cross-link 32, a small cross-link 34, and an antenna 36. One end of the antenna 36 is welded and fixed to one of the blades 30, and the other end extends and is fixed to the output component 24. Figure 1 As shown. The present invention does not specifically limit the number of blades 30, but optionally, the number of blades 30 can be 10.

[0039] The cathode component 22 includes a side support rod assembly, a central support rod assembly, and a filament 40. The central support rod assembly has a shielding cap, and the filament 40 is spirally arranged around the central support rod assembly. The filament 40 is located inside the anode cylinder 28, and there is an interaction space 38 between the multiple blades 30 and the filament 40.

[0040] The magnetic pole component 26 includes a first magnetic pole 42 and a second magnetic pole 44, which are respectively located at both ends of the anode cylinder 28 along a first direction. Figure 1 In this embodiment, the first direction includes a vertical direction, the first magnetic pole 42 is the upper magnetic pole, and the second magnetic pole 44 is the lower magnetic pole. Optionally, the first magnetic pole 42 is conical, and the second magnetic pole 44 is conical. The first magnetic pole 42 is located at the top of the anode cylinder 28, and the second magnetic pole 44 is located at the bottom of the anode cylinder 28.

[0041] The working principle of magnetron 100 is as follows: When magnetron 100 is working, such as Figure 1As shown, a DC voltage of several kilovolts is applied between the filament 40 (cathode) and the blade 30 (anode). Simultaneously, the first permanent magnet 45 and the second permanent magnet 47 provide a magnetic field to the interaction space 38. The DC electric field and DC magnetic field within the interaction space 38 are perpendicular to each other. Electrons emitted from the cathode are accelerated by the electric field and deflected by the magnetic field, undergoing stable oscillating motion within the interaction space 38. The electron velocity is proportional to the ratio E / B (where E is the electric field strength and B is the magnetic flux density). The energy gained from the electric field in the interaction space 38 by the electron stream emitted from the cathode is transferred to a high-frequency field under certain conditions and output externally through an energy output window.

[0042] In related technologies, the upper and lower magnetic poles have the same shape and are symmetrically arranged at the top and bottom of the anode cylinder, meaning they are the same size and shape. The magnetron cannot maintain a relatively constant E / B ratio in the interaction space. Due to the mismatch between the magnetic and electric fields, the force exerted on the electron's motion wheel deviates, resulting in a "fatten" phenomenon in the main wave. Figure 7 As shown, the magnetron design only considered improving the magnetron's output efficiency, without adequately addressing noise suppression. This resulted in microwave ovens using this type of magnetron failing electromagnetic compatibility (EMC) tests.

[0043] In this embodiment of the invention, the first magnetic pole 42 and the second magnetic pole 44 have different shapes and structures. Therefore, the first magnetic pole 42 and the second magnetic pole 44 are asymmetrically arranged at the upper and lower ends of the anode cylinder 28. The magnetic pole structure can change the magnetic field distribution of the interaction space, so that more electrons in the interaction space 38 are in steady-state motion, thereby achieving the purpose of energy exchange, reducing the generation of stray electrons, and reducing the noise emitted by the magnetron 100.

[0044] Specifically, the changes in the structure and position of the magnetic poles can be simulated using simulation methods to calculate the optimized E / B field matching, ensuring that the E / B ratio remains relatively constant within the interaction space 38 of the magnetron 100. This reduces fluctuations and maintains a constant angular drift velocity of electrons throughout the interaction space 38, thereby improving the noise of the magnetron 100. Finally, the scheme is verified through testing. The electron spokes of the magnetron 100 operating stably according to this invention (simulation results) are as follows: Figure 4 As shown.

[0045] Optionally, in one embodiment, the angle of the first magnetic pole 42 is different from the angle of the second magnetic pole 44. Thus, the first magnetic pole 42 and the second magnetic pole 44 can be configured with different shapes by varying the angles of the two magnetic poles.

[0046] Specifically, the magnetic pole includes an edge portion 46, a connecting portion 48, and a middle portion 50, with the connecting portion 48 connecting the edge portion 46 and the middle portion 50. The edge portion 46 and the middle portion 50 are arranged substantially parallel to each other. Figure 2 In the middle, the edge portion 46 and the middle portion 50 are basically parallel to the horizontal plane. The middle portion 50 is provided with a central hole 52.

[0047] The angle of the first magnetic pole 42 can be the angle between the connecting part 48 of the first magnetic pole 42 and the horizontal plane. The angle of the second magnetic pole 44 can be the angle between the connecting part 48 of the second magnetic pole 44 and the horizontal plane.

[0048] The angles of the first magnetic pole 42 and the second magnetic pole 44 are different, resulting in different angles between the two connecting parts 48 of the two magnetic poles and the horizontal plane, thus realizing the first magnetic pole 42 and the second magnetic pole 44 with different shapes and structures.

[0049] Optionally, in one embodiment, the angle of the first magnetic pole 42 is 62° to 68°, and the angle of the second magnetic pole 44 is 69° to 84°.

[0050] Therefore, the specific angles of the first magnetic pole 42 and the second magnetic pole 44 can be determined.

[0051] Specifically, the angle of the first magnetic pole 42 is K2, where 62° ≤ K2 ≤ 68°. In some examples, K2 = 62°, 63°, 64°, 65°, 66°, 67°, 68°, or other values ​​between 62° and 68°.

[0052] The angle of the second magnetic pole 44 is A2, 69°≤A2≤84°. In some examples, A2 = 69°, 72°, 75°, 77°, 79°, 80°, 81°, 83°, 84° or other values ​​between 69° and 84°.

[0053] Optionally, in one embodiment, the angle of the first magnetic pole 42 is K2, the angle of the second magnetic pole 44 is A2, and 0.77≤K2 / A2≤0.94.

[0054] Therefore, the first magnetic pole 42 and the second magnetic pole 44 with different shapes can be achieved from the angle of the two magnetic poles.

[0055] Specifically, please refer to Figure 3 The angle of the first magnetic pole 42 can be the angle between the connecting portion 48 of the first magnetic pole 42 and the horizontal plane. The angle of the second magnetic pole 44 can be the angle between the connecting portion 48 of the second magnetic pole 44 and the horizontal plane.

[0056] The angle of the first magnetic pole 42 is K2, and the angle of the second magnetic pole 44 is A2, and 0.77≤K2 / A2≤0.94, so that the ratio of the two included angles between the connection part 48 of the two magnetic poles and the horizontal plane is 0.77 to 0.94, thereby realizing the first magnetic pole 42 and the second magnetic pole 44 with different shapes.

[0057] In some examples, K2 / A2 = 0.77, 0.78, 0.80, 0.82, 0.85, 0.87, 0.90, 0.91, 0.93, 0.94, or other values ​​between 0.77 and 0.94.

[0058] Optionally, in one embodiment, the flat surface length of the first magnetic pole 42 is different from that of the second magnetic pole 44.

[0059] Thus, the first magnetic pole 42 and the second magnetic pole 44 with different shapes can be achieved by varying the lengths of the flat surfaces of the two magnetic poles.

[0060] Specifically, the flat surface length of the magnetic pole can refer to the length of the middle portion, which is 50 mm. Figure 2 In the middle section 50, the middle part 50 is basically parallel to the horizontal plane. The middle part 50 is provided with a central hole 52. The flat surface length of the first magnetic pole 42 is different from that of the second magnetic pole 44, so that the middle part 50 of the two magnetic poles has different lengths, thereby realizing the first magnetic pole 42 and the second magnetic pole 44 with different shapes and structures.

[0061] Optionally, in one embodiment, the flat surface length of the first magnetic pole 42 is 11 mm to 12 mm, and the flat surface length of the second magnetic pole 44 is 12.5 mm to 15 mm.

[0062] Therefore, the specific lengths of the flat surfaces of the first magnetic pole 42 and the second magnetic pole 44 can be determined.

[0063] Specifically, the flat surface length of the first magnetic pole 42 is t1, 11mm ≤ t1 ≤ 12mm. In some examples, t1 = 11mm, 11.2mm, 11.5mm, 11.7mm, 11.9mm, 12mm or other values ​​between 11mm and 12mm.

[0064] The flat surface length of the second magnetic pole 44 is t2, 12.5mm ≤ t2 ≤ 15mm. In some examples, t2 = 12.5mm, 12.7mm, 12.9mm, 13mm, 13.4mm, 13.7mm, 13.9mm, 14mm, 14.3mm, 14.8mm, 15mm or other values ​​between 12.5mm and 15mm.

[0065] Optionally, in one embodiment, the anode component 20 includes a plurality of blades 30 located within the anode cylinder 28, with an interaction space 38 between the plurality of blades 30 and the filament 40, and the distance between the first magnetic pole 42 and the blades 30 is not equal to the distance between the second magnetic pole 44 and the blades 30.

[0066] Thus, the first magnetic pole 42 and the second magnetic pole 44 with different shapes can be achieved by varying the distances between the two magnetic poles and the blade 30.

[0067] Specifically, the magnetic pole includes an edge portion 46, a connecting portion 48, and a middle portion 50, with the middle portion 50 being closer to the blade 30 than the connecting portion 48 and the edge portion 46. The distance between the first magnetic pole 42 and the blade 30 is the distance between the middle portion 50 of the first magnetic pole 42 and the upper end face of the blade 30, and the distance between the second magnetic pole 44 and the blade 30 is the distance between the middle portion 50 of the second magnetic pole 44 and the lower end face of the blade 30.

[0068] The distance between the first magnetic pole 42 and the blade 30 is not equal to the distance between the second magnetic pole 44 and the blade 30, so that the distance between the middle part 50 of the two magnetic poles and the blade 30 is different, thereby realizing the first magnetic pole 42 and the second magnetic pole 44 with different shapes and structures.

[0069] Optionally, in one embodiment, the distance between the first magnetic pole 42 and the blade 30 is 1.55 mm to 1.75 mm, and the distance between the second magnetic pole 44 and the blade 30 is 1.85 mm to 1.95 mm.

[0070] Therefore, the specific values ​​of the distance between the two magnetic poles and the blade 30 can be determined.

[0071] Specifically, the distance between the first magnetic pole 42 and the blade 30 is d1, where 1.55mm ≤ d1 ≤ 1.75mm. In some examples, d1 = 1.55mm, 1.58mm, 1.60mm, 1.62mm, 1.65mm, 1.68mm, 1.72mm, 1.75mm, or other values ​​between 1.55mm and 1.75mm.

[0072] The distance between the second magnetic pole 44 and the blade 30 is d2, where 1.85mm ≤ d2 ≤ 1.95mm. In some examples, d2 = 1.85mm, 1.88mm, 1.90mm, 1.92mm, 1.94mm, 1.95mm, or other values ​​between 1.85mm and 1.95mm.

[0073] Optionally, in one embodiment, the diameter of the central hole of the first magnetic pole 42 is the same as the diameter of the central hole of the second magnetic pole 44, and the diameter of the central hole is 8.6 mm to 9.3 mm.

[0074] Therefore, it is possible to achieve the same diameter of the central hole in two magnetic poles with different shapes.

[0075] Specifically, the diameter of the central hole of the first magnetic pole 42 is the same as the diameter of the central hole of the middle part 50 of the first magnetic pole 42, and the diameter of the central hole of the second magnetic pole 44 is the same as the diameter of the central hole of the middle part 50 of the second magnetic pole 44.

[0076] The diameter of the central hole of the first magnetic pole 42 is m1, 8.6mm≤m1≤9.3mm. In some examples, m1=8.6mm, 8.7mm, 8.8mm, 8.9mm, 9.2mm, 9.3mm or other values ​​between 8.6mm and 9.3mm.

[0077] The diameter of the central hole of the second magnetic pole 44 is m2, and m2 = m1, 8.6mm ≤ m2 ≤ 9.3mm. In some examples, m2 = 8.6mm, 8.7mm, 8.8mm, 8.9mm, 9.2mm, 9.3mm or other values ​​between 8.6mm and 9.3mm.

[0078] Please refer to Table 1, which shows the parameters of the first magnetic pole 42 and the second magnetic pole 44 in two specific embodiments of the present invention.

[0079] Table 1 Magnetic pole parameters of specific implementation methods

[0080]

[0081] The main waveform of the magnetron 100 in Embodiment 1 is as follows: Figure 5 As shown. The main wave waveform of the magnetron 100 in Embodiment 2 is as follows. Figure 6 As shown. The main waveform of the magnetron in related technologies is as follows. Figure 8 As shown. By Figures 5 to 6 As can be seen, the magnetron 100 of this embodiment can improve the main wave waveform while reducing radiated noise, so that the main wave waveform is mainly concentrated in the frequency range of (2400-2500MHz). In the figure, the horizontal axis represents frequency and the vertical axis represents energy.

[0082] A microwave appliance according to an embodiment of the present invention includes a magnetron 100 according to any of the above embodiments.

[0083] In the aforementioned microwave appliance, the first magnetic pole 42 and the second magnetic pole 44 have different shapes and structures. Therefore, the magnetic field distribution in the interaction space can be changed by altering the magnetic pole structure, allowing more electrons in the interaction space 38 to remain in a steady state, thereby achieving energy exchange, reducing the generation of stray electrons, and lowering the noise emitted by the magnetron 100.

[0084] Specifically, microwave appliances include, but are not limited to, microwave ovens, microwave-steam-grill combination ovens, microwave-grill combination ovens, microwave-steam combination ovens, microwave rice cookers, and integrated stoves.

[0085] The microwave appliance may include a cavity. When the microwave appliance is working, the magnetron 100 generates microwaves, which are guided into the cavity through a waveguide structure and an antenna to heat the food inside the cavity.

[0086] 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 the invention. 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.

[0087] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A tube core of a magnetron, characterized in that, Comprising: an anode member comprising an anode cylinder having an interaction space therein; a cathode member comprising a filament, the filament being located in the anode cylinder, and a pole member comprising a first pole and a second pole, the first pole and the second pole being respectively provided at two ends of the anode cylinder in a first direction, the first pole and the second pole having different shape configurations.

2. The tube core of claim 1, wherein An angle of the first pole is different from an angle of the second pole.

3. The tube core of a magnetron according to claim 1 or 2, characterized in that The angle of the first pole is 62° to 68°, and the angle of the second pole is 69° to 84°.

4. The tube core of a magnetron according to claim 1 or 2, characterized in that The angle of the first pole is K2, the angle of the second pole is A2, and 0.77 ≤ K2 / A2 ≤ 0.

94.

5. The magnetron die of claim 1, wherein, A flat surface length of the first pole is different from a flat surface length of the second pole.

6. The tube core of claim 1 or 5, wherein The flat surface length of the first pole is 11 mm to 12 mm, and the flat surface length of the second pole is 12.5 mm to 15 mm.

7. The magnetron die of claim 1, wherein, The anode member comprises a plurality of vanes in the anode cylinder, the plurality of vanes and the filament being the interaction space, a distance between the first pole and the vanes is not equal to a distance between the second pole and the vanes.

8. The tube core of claim 7, wherein, The distance between the first pole and the vanes is 1.55 mm to 1.75 mm, and the distance between the second pole and the vanes is 1.85 mm to 1.95 mm.

9. The magnetron die of claim 1, wherein, A center hole diameter of the first pole is the same as a center hole diameter of the second pole, and the center hole diameter is 8.6 mm to 9.3 mm.

10. A magnetron, characterized by A tube comprising any one of claims 1-9.

11. A microwave appliance characterized in that, A magnetron comprising claim 10.

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