Tube core of magnetron, magnetron and microwave appliance

Abstract

Disclosed are a tube core (12) of a magnetron (100), the magnetron (100) and a microwave appliance. The tube core (12) of the magnetron (100) comprises: an anode component (20), the anode component (20) comprising an anode cylinder (28), wherein an interaction space (38) is provided in the anode cylinder (28); a cathode component (22), the cathode component (22) comprising a filament (40), wherein the filament (40) is located in the anode cylinder (28); and a magnetic pole component (26), the magnetic pole component (26) comprising a first magnetic pole (42) and a second magnetic pole (44), wherein the first magnetic pole (42) and the second magnetic pole (44) are respectively arranged at two ends of the anode cylinder (28) in a first direction, and the first magnetic pole (42) and the second magnetic pole (44) have different shapes and configurations.

Description

Magnetron core, magnetron and microwave appliance

[0001] Priority information

[0002] The present application claims priority to and the benefit of the filing date of Chinese Patent Application No. 202410868174.3, filed on June 28, 2024, and which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of household appliances, and in particular to a magnetron core, a magnetron and a microwave appliance. BACKGROUND

[0004] In the related art, a microwave oven includes a magnetron, and the magnetron generates microwaves to heat food when working. The current magnetron only considers the problem of improving the output efficiency of the magnetron, and does not fully consider the suppression of the noise of the magnetron, so that the microwave oven using such a magnetron cannot pass the relevant tests of electromagnetic compatibility. SUMMARY

[0005] The present application provides a magnetron core, a magnetron and a microwave appliance to solve at least one of the above technical problems.

[0006] A magnetron core according to an embodiment of the present application includes:

[0007] an anode component including an anode cylinder, the anode cylinder having an interaction space therein;

[0008] a cathode component including a filament, the filament being located in the anode cylinder, and

[0009] a pole component including 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.

[0010] In the above-described magnetron core, the first pole and the second pole have different shape configurations, so that the magnetic field distribution of the interaction space can be changed by the pole structure, so that the electrons in the interaction space are more in stable motion, the purpose of energy exchange is achieved, the generation of stray electrons is reduced, and the noise emitted by the magnetron to the outside is reduced.

[0011] In some embodiments, the angle of the first pole is different from the angle of the second pole.

[0012] In some embodiments, the angle of the first pole is 62° to 68°, and the angle of the second pole is 69° to 84°.

[0013] 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.

[0014] In some embodiments, the flat length of the first magnetic pole is different from the flat length of the second magnetic pole.

[0015] In some embodiments, the flat length of the first magnetic pole is 11mm to 12mm, and the flat length of the second magnetic pole is 12.5mm to 15mm.

[0016] In some embodiments, the anode component comprises a plurality of vanes inside the anode cylinder, the interaction space is between the plurality of vanes and the filament, the distance between the first magnetic pole and the plurality of vanes is not equal to the distance between the second magnetic pole and the plurality of vanes.

[0017] In some embodiments, the distance between the first magnetic pole and the plurality of vanes is 1.55mm to 1.75mm, and the distance between the second magnetic pole and the plurality of vanes is 1.85mm to 1.95mm.

[0018] In some embodiments, the central hole diameter of the first magnetic pole is the same as the central hole diameter of the second magnetic pole, and the central hole diameter is 8.6mm to 9.3mm.

[0019] A magnetron according to an embodiment of the present application comprises the tube core according to any of the above embodiments.

[0020] A microwave appliance according to an embodiment of the present application comprises the magnetron according to any of the above embodiments.

[0021] In the above magnetron and microwave appliance, the first magnetic pole and the second magnetic pole have different shape configurations, thus the magnetic field distribution of the interaction space can be changed by the magnetic pole structure, so that 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 by the magnetron to the outside is reduced.

[0022] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0024] Fig. 1 is a schematic cross-sectional view of a magnetron according to an embodiment of the present application;

[0025] Fig. 2 is a schematic cross-sectional view of a tube core of a magnetron according to an embodiment of the present application;

[0026] Fig. 3 is a schematic view of dimensions of a tube core of a magnetron according to an embodiment of the present application;

[0027] Fig. 4 is a schematic view of electron spokes (simulation result) of stable operation of a magnetron according to an embodiment of the present application;

[0028] Fig. 5 is a schematic view of a main wave form of a magnetron according to an embodiment of the present application;

[0029] Fig. 6 is a schematic view of a main wave form of a magnetron according to an embodiment of the present application;

[0030] Fig. 7 is a schematic view of electron spokes (simulation result) of stable operation of a magnetron according to the related art;

[0031] Fig. 8 is a schematic view of a main wave form of a magnetron according to the related art.

[0032] Reference Signs List: magnetron 100, tube core 12, support 14, input power supply assembly 16, heat dissipation member 18, anode member 20, cathode member 22, output member 24, magnetic pole member 26, anode cylinder 28, vane 30, large cross-link ring 32, small cross-link ring 34, antenna 36, interaction space 38, filament 40, first magnetic pole 42, second magnetic pole 44, first permanent magnet 45, second permanent magnet 47, wherein the magnetic pole includes edge portion 46, connection portion 48, intermediate portion 50, center hole 52. DETAILED DESCRIPTION

[0033] Embodiments of the present application are described in detail below with reference to the attached drawings. The embodiments described below are examples of the present application and are not intended to limit the present application. The same or similar components are denoted by the same or similar reference numerals throughout the drawings.

[0034] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0035] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected. It can be mechanically connected or electrically connected. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or the contact of the first and second features through another feature between them. Moreover, the "upper", "above" and "above" of the first feature to the second feature include the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0037] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For purposes of explanation and ease of understanding, specific examples of components and arrangements are described in the following disclosure. Of course, they are merely examples and are not intended to limit the present application. Also, the present application can refer to a number of different examples throughout the following disclosure. Such repetition is for the sake of simplicity and clarity and is not itself intended to indicate a relationship between the different embodiments and / or arrangements discussed. Additionally, the present application provides various examples of specific processes and materials. However, one of ordinary skill in the art can readily recognize that other processes can be used and / or other materials employed.

[0038] Referring to FIGS. 1-3, a magnetron 100 according to embodiments of the present application includes a tube core 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 an inner sidewall of the bracket 14 and an outer sidewall of the tube core 12.

[0039] The tube core 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, a plurality of vanes 30, a large cross-link ring 32, a small cross-link ring 34, and an antenna 36. One end of the antenna 36 is welded and fixed to one of the vanes 30, and the other end of the antenna 36 extends and is fixed to the output component 24, as shown in FIG. 1. The number of vanes 30 is not specifically limited in the present application, and the number of vanes 30 can be 10, for example.

[0040] The cathode component 22 includes a side support rod assembly, a center support rod assembly, and a filament 40. The center support rod assembly has a shielding cap, and the filament 40 is spirally arranged on the center support rod assembly. The filament 40 is located in the anode cylinder 28, and an interaction space 38 is formed between the plurality of vanes 30 and the filament 40.

[0041] The magnetic pole component 26 includes a first magnetic pole 42 and a second magnetic pole 44. The first magnetic pole 42 and the second magnetic pole 44 are respectively disposed at two ends of the anode cylinder 28 along a first direction. In the embodiment of FIG. 1, the first direction includes an up-down direction, the first magnetic pole 42 is an upper magnetic pole, and the second magnetic pole 44 is a lower magnetic pole. Alternatively, the first magnetic pole 42 is conical, and the second magnetic pole 44 is conical. The first magnetic pole 42 is disposed at a top end of the anode cylinder 28, and the second magnetic pole 44 is disposed at a bottom end of the anode cylinder 28.

[0042] The working principle of the magnetron 100 is as follows: when the magnetron 100 works, as shown in FIG. 1, a direct current voltage of several kilovolts is applied between the filament 40 (cathode) and the vane 30 (anode), and the first permanent magnet 45 and the second permanent magnet 47 provide a magnetic field for the interaction space 38. The direct current electric field and the direct current magnetic field in the interaction space 38 are perpendicular to each other. The cathode emits electrons, which are accelerated by the electric field force and deflected by the magnetic field force, and perform stable oscillation movement in the interaction space 38. The speed of the electron movement is proportional to the ratio of E / B (E is the electric field strength and B is the magnetic flux density). The electron flow emitted by the cathode obtains energy from the electric field in the interaction space 38, and under certain conditions, the energy is transferred to the high-frequency field, which is output externally through the energy output window.

[0043] In the related art, the upper magnetic pole and the lower magnetic pole have the same shape and are symmetrically arranged at the top end and the bottom end of the anode cylinder, that is, the upper magnetic pole and the lower magnetic pole have the same size and shape. The magnetron cannot satisfy the relative constancy of E / B of the interaction space. Due to the mismatch between the magnetic field and the electric field, the action force of the field on the electron movement spoke appears a certain deviation, resulting in the "enlargement" of the main wave, as shown in FIG. 7. The magnetron only considers the problem of improving the output efficiency of the magnetron, and does not fully consider the suppression of the noise of the magnetron, resulting in that the microwave oven using the magnetron cannot pass the relevant test of electromagnetic compatibility.

[0044] In the embodiments of the present application, the first magnetic pole 42 and the second magnetic pole 44 have different shape 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 field distribution of the interaction space can be changed by the structure of the magnetic pole, so that the electrons in the interaction space 38 are more in the stable state, the purpose of energy exchange is achieved, the generation of stray electrons is reduced, and the noise emitted by the magnetron 100 to the outside is reduced.

[0045] Specifically, the changes of the structure and position of the magnetic pole can be simulated by a simulation method, the E / B field optimization matching is calculated, the E / B in the interaction space 38 of the magnetron 100 is made to satisfy a relatively constant value, the fluctuation is reduced, and the angular drift speed of the electrons in the entire interaction space 38 is kept constant, thereby being beneficial to improving the noise of the magnetron 100. Finally, the scheme is verified by testing. The electron spoke (simulation result) of the stable working of the magnetron 100 of the present application is shown in FIG. 4.

[0046] Optionally, in an 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 with different shape structures can be realized from the different angles of the two magnetic poles.

[0047] Specifically, the magnetic pole includes an edge portion 46, a connecting portion 48, and a middle portion 50, 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 in parallel. In FIG. 2, the edge portion 46 and the middle portion 50 are substantially parallel to the horizontal plane. The middle portion 50 is provided with a central hole 52.

[0048] The angle of the first magnetic pole 42 can be the included 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 included angle between the connecting portion 48 of the second magnetic pole 44 and the horizontal plane.

[0049] The angle of the first magnetic pole 42 is different from the angle of the second magnetic pole 44, so that the included angles between the two connecting portions 48 of the two magnetic poles and the horizontal plane are different, thereby realizing the first magnetic pole 42 and the second magnetic pole 44 with different shape configurations.

[0050] Optionally, in an 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°.

[0051] In this way, the specific angles of the first magnetic pole 42 and the second magnetic pole 44 can be determined.

[0052] Specifically, the angle of the first magnetic pole 42 is K2, and 62°≤K2≤68°. In some examples, K2=62°, 63°, 64°, 65°, 66°, 67°, 68°, or other values between 62° and 68°.

[0053] The angle of the second magnetic pole 44 is A2, and 69°≤A2≤84°. In some examples, A2=69°, 72°, 75°, 77°, 79°, 80°, 81°, 83°, 84°, or other values between 69° and 84°.

[0054] Optionally, in an 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.

[0055] In this way, the first magnetic pole 42 and the second magnetic pole 44 with different shape configurations can be realized from the angle ratio of the two magnetic poles.

[0056] Specifically, referring to FIG. 3, the angle of the first magnetic pole 42 can be the included 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 included angle between the connecting portion 48 of the second magnetic pole 44 and the horizontal plane.

[0057] 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, so that the ratio of the two included angles between the connecting portion 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 shape configurations.

[0058] 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.

[0059] Optionally, in an embodiment, the flat length of the first magnetic pole 42 is different from the flat length of the second magnetic pole 44.

[0060] Thus, the first magnetic pole 42 and the second magnetic pole 44 with different shape configurations can be realized from the difference in the flat length of the two magnetic poles.

[0061] Specifically, the flat length of the magnetic pole can refer to the length of the middle portion 50. In FIG. 2, the middle portion 50 is substantially parallel to the horizontal plane. The middle portion 50 is provided with a central hole 52. The flat length of the first magnetic pole 42 is different from the flat length of the second magnetic pole 44, so that the lengths of the middle portions 50 of the two magnetic poles are different, thereby realizing the first magnetic pole 42 and the second magnetic pole 44 with different shape configurations.

[0062] Optionally, in an embodiment, the flat length of the first magnetic pole 42 is 11mm to 12mm, and the flat length of the second magnetic pole 44 is 12.5mm to 15mm.

[0063] Thus, the specific length of the flat of the first magnetic pole 42 and the second magnetic pole 44 can be determined.

[0064] Specifically, the flat length of the first magnetic pole 42 is t1, and 11mm≤t1≤12mm. In some examples, t1=11mm, 11.2mm, 11.5mm, 11.7mm, 11.9mm, 12mm, or other values between 11mm and 12mm.

[0065] The flat length of the second magnetic pole 44 is t2, and 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.

[0066] Optionally, in one embodiment, the anode component 20 includes a plurality of vanes 30 within the anode cylinder 28, the plurality of vanes 30 and the filament 40 being the interaction space 38, the distance between the first magnetic pole 42 and the vanes 30 not being equal to the distance between the second magnetic pole 44 and the vanes 30.

[0067] Thus, the first magnetic pole 42 and the second magnetic pole 44 can be configured differently in shape by the different distances between the two magnetic poles and the vanes 30.

[0068] Specifically, the magnetic poles include an edge portion 46, a connecting portion 48, and a middle portion 50, the middle portion 50 being closer to the vanes 30 than the connecting portion 48 and the edge portion 46. The distance between the first magnetic pole 42 and the vanes 30 is the distance between the middle portion 50 of the first magnetic pole 42 and the upper end surface of the vanes 30, and the distance between the second magnetic pole 44 and the vanes 30 is the distance between the middle portion 50 of the second magnetic pole 44 and the lower end surface of the vanes 30.

[0069] The distance between the first magnetic pole 42 and the vanes 30 is not equal to the distance between the second magnetic pole 44 and the vanes 30, so that the distances between the middle portions 50 of the two magnetic poles and the vanes 30 are different, thereby realizing the first magnetic pole 42 and the second magnetic pole 44 configured differently in shape.

[0070] Optionally, in one embodiment, the distance between the first magnetic pole 42 and the vanes 30 is 1.55 mm to 1.75 mm, and the distance between the second magnetic pole 44 and the vanes 30 is 1.85 mm to 1.95 mm.

[0071] Thus, the specific values of the distances between the two magnetic poles and the vanes 30 can be determined.

[0072] Specifically, the distance between the first magnetic pole 42 and the vanes 30 is d1, and 1.55 mm≤d1≤1.75 mm. In some examples, d1=1.55 mm, 1.58 mm, 1.60 mm, 1.62 mm, 1.65 mm, 1.68 mm, 1.72 mm, 1.75 mm, or other values between 1.55 mm and 1.75 mm.

[0073] The distance between the second magnetic pole 44 and the vanes 30 is d2, and 1.85 mm≤d2≤1.95 mm. In some examples, d2=1.85 mm, 1.88 mm, 1.90 mm, 1.92 mm, 1.94 mm, 1.95 mm, or other values between 1.85 mm and 1.95 mm.

[0074] Optionally, in one embodiment, the central hole diameter of the first magnetic pole 42 is the same as the central hole diameter of the second magnetic pole 44, and the central hole diameter is 8.6 mm to 9.3 mm.

[0075] Thus, the center hole diameters of the two magnetic poles can be the same based on different shape configurations of the two magnetic poles.

[0076] Specifically, the center hole diameter of the first magnetic pole 42 is the center hole diameter of the middle portion 50 of the first magnetic pole 42, and the center hole diameter of the second magnetic pole 44 is the center hole diameter of the middle portion 50 of the second magnetic pole 44.

[0077] The center hole diameter of the first magnetic pole 42 is m1, and 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.

[0078] The center hole diameter of the second magnetic pole 44 is m2, and m2=m1, and 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.

[0079] Please refer to Table 1, which is the parameters of the first magnetic pole 42 and the second magnetic pole 44 in the two specific embodiments of the present application.

[0080] Table 1: Magnetic pole parameters of specific embodiments

[0081] The main wave form of the magnetron 100 of the first embodiment is shown in FIG. 5. The main wave form of the magnetron 100 of the second embodiment is shown in FIG. 6. The main wave form of the magnetron in the related art is shown in FIG. 8. As can be seen from FIGS. 5-6, the magnetron 100 of the embodiments of the present application can improve the main wave form while reducing radiation noise, so that the main wave form is mainly concentrated in the frequency range of (2400-2500MHz). In the figures, the abscissa represents the frequency, and the ordinate represents the energy.

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

[0083] In the above microwave appliance, the first magnetic pole 42 and the second magnetic pole 44 have different shape configurations. Therefore, the magnetic field distribution of the interaction space can be changed by the magnetic pole structure, so that the electrons in the interaction space 38 are more in stable motion, achieving the purpose of energy exchange, reducing the generation of stray electrons, and reducing the noise emitted by the magnetron 100.

[0084] Specifically, the microwave appliance includes but is not limited to a microwave oven, a microwave steaming and baking all-in-one machine, a microwave baking all-in-one machine, a microwave steaming all-in-one machine, a microwave rice cooker, an integrated cooker, etc.

[0085] The microwave appliance can include a cavity, and when the microwave appliance is in operation, the magnetron 100 generates microwaves, the microwaves are introduced into the cavity through the waveguide structure and the antenna, and food materials in the cavity are heated.

[0086] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" etc. means that the specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. The exemplary expressions of the above terms in the present specification do not necessarily refer to the same embodiment or example. Also, the specific feature, structure, material or characteristic described can be combined in any one or more embodiments or examples in an appropriate manner.

[0087] Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, alternatives and variations can be made thereto without departing from the principles and spirit of the application, 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 any of claims 1-4, wherein, A flat surface length of the first pole is different from a flat surface length of the second pole.

6. The magnetron die of any of claims 1-5, 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 any of claims 1-6, 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 any of claims 1-8, 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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