Magnetron for microwave oven

Abstract

The invention discloses a magnetron for a microwave oven, and belongs to the technical field of microwave sources in vacuum electronic devices. The magnetron comprises an anode assembly, a cathode assembly, an input assembly, an output assembly and a permanent magnet, wherein two ends of an anode blade of the anode assembly adopt double-end single-ring diaphragm belts to replace the existing double-end double-ring diaphragm belts. According to the magnetron disclosed by the invention, high-stability and high-efficiency output is kept on the basis of reducing anode materials and simplifying the assembly process flow of the diaphragm belt and the anode blades, so that the cost of the microwave oven can be further reduced, and the requirements of more people can be met.

Description

Technical Field

[0001] This invention relates to the field of microwave source technology in vacuum electronic devices, and specifically to a low-cost magnetron for microwave ovens. Background Technology

[0002] Magnetrons, as high-power vacuum electronic microwave sources, are widely used in communications, radar, microwave weapons, medical applications, and industrial and food heating fields. They are a relatively inexpensive microwave energy generator. Magnetrons also offer advantages such as high efficiency, simple manufacturing process, reliable operation, low operating voltage, and the generation of clean energy.

[0003] In the field of 2.458GHz microwave oven magnetrons, the annual production volume reaches tens of millions of units, representing a huge market in the consumer sector. However, currently available microwave oven magnetrons generally use a double-ended, double-ring diaphragm tape structure, which faces challenges such as high diaphragm tape costs, the need for further process optimization, and insufficient product price diversification. Therefore, it is necessary to improve existing technologies to overcome their shortcomings. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention proposes a magnetron for microwave ovens that uses a double-ended single-ring diaphragm strip instead of the traditional double-ended double-ring diaphragm strip. While maintaining the same frequency, high efficiency, and sufficient heating power, this invention further reduces the processing and material costs of the magnetron, enabling microwave ovens to achieve lower costs and meet the needs of a wider range of consumers.

[0005] The technical solution adopted in this invention is as follows:

[0006] A magnetron for microwave ovens, characterized in that it comprises: an anode assembly, a cathode assembly, an input assembly, an output assembly, and a permanent magnet;

[0007] The anode assembly includes: an anode cylinder, N anode blades, a spacer belt, an A-side electrode shoe, and a K-side electrode shoe; wherein, the anode cylinder is a circular anode cylinder; the anode blades are evenly distributed on the inner wall of the anode cylinder, and the cavity between adjacent anode blades is a fan-shaped cavity; the A-side electrode shoe is installed in the open end on one side of the anode cylinder where the input assembly is located; the K-side electrode shoe is installed in the open end on one side of the anode cylinder where the input assembly is located; the value of N is 8, 10, or 12;

[0008] The cathode assembly includes: a cathode emitter, an upstream end cap, a downstream end cap, and a cathode power supply column; wherein, the cathode emitter is coaxially disposed in the inner space of the anode blade; the upstream end cap and the downstream end cap are respectively located on the input side and the output side of the cathode emitter; the cathode power supply column is connected to the other end of the upstream end cap to support and fix the cathode;

[0009] The input component is located at the input end of the anode cylinder;

[0010] The output component is located in the output section of the anode cylinder;

[0011] The permanent magnet is disposed on the outside of the input component and the output component to provide a magnetic field for the magnetron;

[0012] The feature is that a single-ring diaphragm strip is provided at both ends of the anode blade; the single-ring diaphragm strip has a circular ring columnar structure, the single-ring diaphragm strip is connected to the spaced anode blades, and each anode blade is connected to the single-ring diaphragm strip on only one side.

[0013] Preferably, one end of the anode blade is provided with a first groove and the other end is provided with a second groove; at least one side of the single-ring diaphragm belt is in contact with the first groove, and the single-ring diaphragm belt is suspended in the second groove.

[0014] Preferably, the first groove is a stepped groove, and the bottom end of the single-ring diaphragm belt is provided with N / 2 arc-shaped cylindrical protrusions, and the arc-shaped cylindrical protrusions are matched with the bottom groove shape of the stepped groove, so that the bottom surface of the arc-shaped cylindrical protrusions contacts the bottom of the stepped groove.

[0015] Preferably, the first groove is a stepped groove, the outer or inner side of the single-ring diaphragm strip is in contact with the outer or inner side wall of the first groove, and the bottom surface of the single-ring diaphragm strip is in contact with the step of the first groove.

[0016] Preferably, the size of the first groove matches the size of the single-ring diaphragm belt, allowing the single-ring diaphragm belt to be inserted and secured.

[0017] Preferably, the top surface of the single-ring diaphragm strip is flush with the surface of the anode blade.

[0018] Preferably, all anode blades have the same structure, and adjacent anode blades are installed in opposite directions to reduce the processing cost of the anode blades.

[0019] Preferably, the inner radius of the single-ring diaphragm belt is in the range of 6.5mm-8mm, the thickness is in the range of 7mm-8.5mm, and the height is in the range of 1.5mm-2mm.

[0020] Preferably, the output component includes an output cylinder and an inner conductor of the antenna. One end of the inner conductor of the antenna forms a coaxial output structure with the output cylinder, and the other end passes through a through hole provided on the K-side pole shoe to connect to the anode blade.

[0021] The beneficial effects of this invention are as follows:

[0022] The magnetron of this invention adopts a double-ended single-ring design instead of the existing double-ended double-ring diaphragm strip design. The groove on the anode blade for placing the diaphragm strip is narrowed and deepened and moved forward towards the blade end. While ensuring reasonable parameter design, it significantly reduces the amount of oxygen-free copper material required to manufacture the magnetron diaphragm strip compared with the traditional magnetron, providing a feasible solution for further reducing material and processing costs. Attached Figure Description

[0023] Figure 1 The diagram shows an axial cross-sectional view of the overall magnetron of the first dual-end single-ring height reduction scheme provided in Embodiment 1 of the present invention.

[0024] Figure 2 The first connection method between the anode blade and the diaphragm belt is shown.

[0025] Figure 3 A second connection method between the anode blades and the diaphragm belt is shown.

[0026] Figure 4 A third connection method between the anode blades and the diaphragm belt is shown.

[0027] Among them: 1. Anode tube, 2. Anode blade, 3. Input tube, 4. Output tube, 5. Inner conductor of antenna, 6. A-side pole shoe, 7. K-side pole shoe, 8. Cathode emitter, 9. Upstream end cap, 10. Downstream end cap, 11. Cathode power supply column, 12. Single-ring diaphragm strip, 13. First groove, 14. Second groove, 15. Output groove, 16. Arc-shaped cylindrical protrusion. Detailed Implementation

[0028] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] The magnetron used in this microwave oven operates at a frequency of 2.457 GHz. Figure 1 As shown, it includes: an anode assembly, a cathode assembly, an input assembly, an output assembly, and a permanent magnet.

[0030] The anode assembly includes: an anode cylinder, 10 anode blades, a double-ended single-ring spacer belt, an A-side electrode shoe, and a K-side electrode shoe; wherein, the anode cylinder is a circular anode cylinder with an inner diameter of 17.5 mm; the anode blades are evenly distributed on the inner wall of the anode cylinder, the cavity between adjacent anode blades is a fan-shaped cavity, and the blade slit ratio at the end of the anode blade is 2.247; the A-side electrode shoe is installed in the open end on one side of the anode cylinder where the input assembly is located; the K-side electrode shoe is installed in the open end on one side of the anode cylinder where the input assembly is located.

[0031] The cathode assembly includes: a cathode emitter, an upstream end cap, a downstream end cap, and a cathode power supply column; wherein, the cathode emitter is coaxially disposed in the inner space of the anode blade; the upstream end cap and the downstream end cap are respectively located on the input side and the output side of the cathode emitter; the cathode power supply column is connected to the other end of the upstream end cap to support and fix the cathode.

[0032] The input component is located at the input end of the anode cylinder. The output component is located at the output section of the anode cylinder and includes an output cylinder and an inner antenna conductor. One end of the inner antenna conductor forms a coaxial output structure with the output cylinder, and the other end passes through a through hole provided on the K-side pole shoe to connect to an output slot on any anode blade. The output slot has a distance of 2.2 mm from the anode cylinder, a depth of 1 mm, a length of 1.25 mm, and a radial width of 2 mm. The permanent magnet is disposed outside the input component and the output component to provide a magnetic field for the magnetron.

[0033] One end of the anode blade is provided with a first groove and the other end is provided with a second groove; all anode blades have the same structure, and adjacent anode blades are installed in opposite directions to reduce the processing cost of the anode blades. The single-ring diaphragm belt is connected to the spaced anode blades, and each anode blade is connected to the single-ring diaphragm belt on only one side.

[0034] This embodiment provides three connection methods between the single-ring diaphragm belt and the anode blades, such as... Figures 2-4 As shown.

[0035] The first connection method is an insertion connection. The single-ring diaphragm belt is a cylindrical structure with an inner radius of 7.25 mm, an outer radius of 7.96 mm, and a height L3 of 2 mm. Five equally spaced arc-shaped cylindrical protrusions are located at the bottom of the cylindrical structure. The overall height L1 of the cylindrical structure and the arc-shaped protrusions is 2.8 mm. The first groove is a stepped groove with a maximum depth L1 of 2.8 mm and a step depth L2 of 2.5 mm. The arc-shaped cylindrical protrusions match the bottom groove shape of the stepped groove, ensuring that the bottom surface of the arc-shaped protrusions contacts the bottom of the stepped groove, and the top surface of the single-ring diaphragm belt is flush with the surface of the anode blade. The second groove has a dimension L2 of 2.5 mm, allowing the single-ring diaphragm belt to float within it.

[0036] The second connection method is a single-sided extrusion connection. The single-ring diaphragm belt is a cylindrical structure with an inner radius of 7.25 mm, an outer radius of 7.96 mm, and a height L3 of 2 mm. The first groove is a stepped groove with a maximum depth L2 of 2.5 mm and an upper step depth L3 of 2 mm. This allows the single-ring diaphragm belt to be placed behind the step, with its outer surface contacting the outer wall of the upper step of the first groove, its bottom surface contacting the step, and its top surface flush with the surface of the anode blade. The second groove has a L2 dimension of 2.5 mm, allowing the single-ring diaphragm belt to float within it.

[0037] In this connection method, the first groove is a stepped groove, which can further reduce the material used for the anode blades.

[0038] The third connection method is a double-sided extrusion connection. The single-ring diaphragm belt is a cylindrical structure with an inner radius of 7.25 mm, an outer radius of 7.96 mm, and a height L3 of 2 mm. The shape of the first groove matches the shape of the cylindrical structure. After the single-ring diaphragm belt is inserted into the first groove, its top surface is flush with the surface of the anode blade, and the other three surfaces are in contact with the first groove. The second groove has a size L2 of 2.5 mm, allowing the single-ring diaphragm belt to float in the second groove.

[0039] Compared to a traditional double-ended, double-ring diaphragm magnetron operating at the same 2.457 GHz, this invention maintains the same structural parameters and dimensions, achieving a final efficiency of 74.44%, an anode current of 0.48 A, and an output power of 820 W (operating voltage without duty cycle). The design results meet the parameter requirements for furnace magnetrons. Furthermore, the single-ring diaphragm belt material can be reduced by 101.5 mm compared to a double-ended, single-ring diaphragm belt. 3 Oxygen-free copper reduces the volume by approximately 41%, and only one groove needs to be cut at one end of the anode blade to place the diaphragm belt, saving processing costs and processing time.

[0040] The above description is merely a specific embodiment of the present invention. Any feature disclosed in this specification, unless otherwise specified, can be replaced by other equivalent or similar alternative features. All disclosed features, or steps in all methods or processes, except for mutually exclusive features and steps, can be combined in any manner.

Claims

1. A magnetron for a microwave oven, characterized in that, include: Anode assembly, cathode assembly, input assembly, output assembly, permanent magnet; The anode assembly includes: an anode cylinder, N anode blades, a spacer belt, an A-side electrode shoe, and a K-side electrode shoe; wherein, the anode cylinder is a circular anode cylinder; the anode blades are evenly distributed on the inner wall of the anode cylinder, and the cavity between adjacent anode blades is a fan-shaped cavity; the A-side electrode shoe is installed in the open end on one side of the anode cylinder where the input assembly is located; the K-side electrode shoe is installed in the open end on one side of the anode cylinder where the input assembly is located; the value of N is 8, 10, or 12; The cathode assembly includes: a cathode emitter, an upstream end cap, a downstream end cap, and a cathode power supply column; wherein, the cathode emitter is coaxially disposed in the inner space of the anode blade; the upstream end cap and the downstream end cap are respectively located on the input side and the output side of the cathode emitter; the cathode power supply column is connected to the other end of the upstream end cap to support and fix the cathode; The input component is located at the input end of the anode cylinder; The output component is located in the output section of the anode cylinder; The permanent magnet is disposed on the outside of the input component and the output component to provide a magnetic field for the magnetron; The feature is that a single-ring diaphragm strip is provided at both ends of the anode blade; the single-ring diaphragm strip has a circular ring columnar structure, the single-ring diaphragm strip is connected to the spaced anode blades, and each anode blade is connected to the single-ring diaphragm strip on only one side.

2. A magnetron for a microwave oven as described in claim 1, characterized in that, The anode blade has a first groove at one end and a second groove at the other end; at least one side of the single-ring diaphragm belt is in contact with the first groove, and the single-ring diaphragm belt is suspended in the second groove.

3. A magnetron for a microwave oven as described in claim 2, characterized in that, The first groove is a stepped groove, and the bottom end of the single-ring diaphragm belt is provided with N / 2 arc-shaped cylindrical protrusions, and the arc-shaped cylindrical protrusions are matched with the bottom groove shape of the stepped groove, so that the bottom surface of the arc-shaped cylindrical protrusions contacts the bottom of the stepped groove.

4. A magnetron for a microwave oven as described in claim 2, characterized in that, The first groove is a stepped groove, and the outer or inner side of the single-ring diaphragm strip contacts the outer or inner side wall of the first groove, and the bottom surface of the single-ring diaphragm strip contacts the step of the first groove.

5. A magnetron for a microwave oven as described in claim 2, characterized in that, The size of the first groove matches the size of the single-ring diaphragm belt, allowing the single-ring diaphragm belt to be inserted and secured.

6. A magnetron for a microwave oven as described in claims 2-5, characterized in that, The top surface of the single-ring diaphragm belt is flush with the surface of the anode blade.

7. A magnetron for a microwave oven as described in claim 6, characterized in that, All anode blades have the same structure, and adjacent anode blades are installed in opposite directions to reduce the processing cost of the anode blades.

8. A magnetron for a microwave oven as described in claim 7, characterized in that, The inner radius of the single-ring diaphragm belt ranges from 6.5mm to 8mm, the thickness ranges from 7mm to 8.5mm, and the height ranges from 1.5mm to 2mm.

9. A magnetron for a microwave oven as described in claim 8, characterized in that, The output component includes an output cylinder and an inner conductor of the antenna. One end of the inner conductor of the antenna forms a coaxial output structure with the output cylinder, and the other end passes through a through hole provided on the K-side pole shoe to connect to the anode blade.

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