A magnetron for a microwave oven with integrated dual frequency output

Abstract

The present application belongs to the field of microwave source technology in vacuum electron devices, and particularly relates to a same-voltage integrated double-frequency output magnetron for microwave oven, which is provided with two magnetrons with different frequencies and sizes, a heat dissipation structure and a magnetic circuit structure, the two magnetrons share one magnetic circuit structure, and the magnetron part and the heat dissipation structure are arranged in the magnetic circuit structure; the heat dissipation structure is provided with three parts of left heat dissipation fins, middle heat dissipation fins and right heat dissipation fins, wherein the left heat dissipation fins are arranged outside one magnetron and extend to the left, the right heat dissipation fins are arranged outside the other magnetron and extend to the right, and the two magnetrons are fixedly connected through the middle heat dissipation fins. In the present application, the same-voltage integrated double-frequency output magnetron is used, the frequencies of the two magnetrons are 2.45 GHz and 5.8 GHz respectively, the frequency difference is large, and the mutual coupling between the two outputs is small; and the double-frequency structure adopts the same voltage and is designed in an integrated manner, so that the structure is simple and suitable for various microwave ovens, and the placement problem of the two magnetrons and the heating uniformity problem are solved.

Description

Technical Field

[0001] This invention belongs to the field of microwave source technology in vacuum electronic devices, and specifically relates to a magnetron for microwave ovens with integrated dual-frequency output and the same voltage. Background Technology

[0002] Nowadays, people commonly use microwave ovens to quickly heat food, which is convenient and efficient. However, the high-frequency microwaves generated by the magnetron are directly transmitted into the oven cavity through the waveguide. The unevenness of the microwaves in the oven cavity causes differences in the heating rate of different parts of the food, resulting in uneven heating and unsatisfactory heating effect.

[0003] To address this issue, a design using dual-frequency dual magnetrons has been proposed to improve the uniformity of microwave ovens. However, in such a design, the frequencies of the two magnetrons are not significantly different, both around 2.45 GHz. This makes it easy for two feed sources with similar frequencies to become mutually coupled. Furthermore, the limited space inside the oven makes it difficult to place two magnetrons, and there are also high requirements for heat dissipation. Summary of the Invention

[0004] To overcome the above technical problems, this invention provides a magnetron for a microwave oven with integrated dual-frequency output at the same voltage. The two magnetrons have frequencies of 2.45 GHz and 5.8 GHz, respectively. The 5.8 GHz magnetron has a shorter wavelength, resulting in a more uniform distribution of standing waves in the oven cavity. At the same time, the large frequency difference between the two magnetrons reduces the mutual coupling between the output structures. Furthermore, this dual-frequency structure uses the same voltage and is designed as an integrated unit, which is simple in structure and suitable for various microwave oven models. It solves the problems of placing the two magnetrons and ensuring uniform heating.

[0005] The present invention, which solves the above technical problems, provides a magnetron for a microwave oven with integrated dual-frequency output and the same voltage. Its features include: two magnetrons of different frequencies and sizes, a heat dissipation structure, and a magnetic circuit structure. The two magnetrons share a single magnetic circuit structure, with the magnetron portion and the heat dissipation structure housed within the magnetic circuit structure. The heat dissipation structure comprises three parts: a left heat sink, a middle heat sink, and a right heat sink. The left heat sink extends to the left from the outside of one magnetron, and the right heat sink extends to the right from the outside of the other magnetron. The two magnetrons are fixedly connected via the middle heat sink.

[0006] The two magnetrons, which have different frequencies and sizes, are a 2.45GHz magnetron and a 5.8GHz magnetron connected in parallel.

[0007] The magnetic circuit structure is composed of upper and lower cover plates with a hollow interior. The upper and lower cover plates form a cavity combined by two "匚" shapes, with the left side being larger and the right side being smaller. In the present invention, due to the large size difference between the two magnetrons, the two magnetrons are directly arranged in one cavity, using the same voltage source and designed as an integrated unit, which saves space, is convenient for installation, and solves the problem of the placement of the two magnetrons in the microwave oven cavity.

[0008] The 2.45GHz magnetron is provided with a black ball I and a magnet I. The magnet I is provided with an upper magnet I and a lower magnet I. The upper magnet I and the lower magnet I are respectively arranged at positions close to the upper bottom plate and the lower bottom plate of the magnetic circuit structure. The output end and the input end of the black ball I are respectively inserted into the upper magnet I and the lower magnet I, and pass through the upper bottom plate and the lower bottom plate of the magnetic circuit structure, and extend upward and downward respectively.

[0009] The 5.8GHz magnetron is provided with a black ball II and a magnet II. The magnet II is provided with an upper magnet II and a lower magnet II. The upper magnet II and the lower magnet II are respectively arranged at positions close to the upper bottom plate and the lower bottom plate of the magnetic circuit structure. The output end and the input end of the black ball II are respectively inserted into the upper magnet and the lower magnet, and pass through the upper bottom plate and the lower bottom plate of the magnetic circuit structure, and extend upward and downward respectively.

[0010] In the optimized solution, the top ends of the upper magnet II of the 5.8GHz magnetron and the upper magnet I of the 2.45GHz magnetron are on the same horizontal plane.

[0011] The black ball structure I and the black ball structure II are connected by an intermediate heat sink, so as to be fixedly connected into one body. The structures of the black ball I and the black ball II are basically the same, but the sizes are different and the difference is large.

[0012] The two magnetrons share a magnetic circuit structure. There is a certain distance between the lower bottom plate of the magnetic circuit structure and the lower magnet of the 2.45GHz magnetron, and there is a certain space between the lower magnet I and the right side of the magnetic circuit structure. The distance and the space are appropriate to avoid the magnetic field of the two magnetrons from interfering with each other.

[0013] The two magnetrons use the same voltage source.

[0014] In the optimized solution, the two magnetrons use the same voltage source, and the working voltage range is 3 - 5kV. The currents flowing through the cathodes of the two magnetrons can be different. The output power of each magnetron can be 400 - 900W.

[0015] In a further optimized solution, the number of the left heat sink, the intermediate heat sink and the right heat sink is 4 - 6.

[0016] The present invention has the following beneficial effects:

[0017] (1) By using two magnetrons with different operating frequencies, namely 2.45GHz and 5.8GHz, the problem of uniform heating of magnetrons in microwave ovens can be solved.

[0018] (2) Two magnetrons with different frequencies use the same voltage and share a magnetic circuit structure. They are fixedly connected by a heat sink, which solves the problem of installing two magnetrons in a microwave oven at the same time.

[0019] (3) The two magnetrons with different frequencies are integrated into one unit, which has a simple structure, is easy to install, and has broad application prospects. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the cross-sectional structure of the magnetron in this invention.

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the heat dissipation structure in this invention.

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of the magnetic circuit structure in this invention.

[0023] Figures 4-7 for Figure 1 Partial view of the black ball

[0024] The diagram shows the following components: the left side is a 2.45GHz magnetron, including: 1. Black sphere I, 3-1. Upper magnet I, 3-2. Lower magnet I; the right side is a 5.8GHz magnetron, including: 2. Black sphere II, 6-1. Upper magnet II, 6-2. Lower magnet II; 4. Magnetic circuit structure, 5. Heat dissipation structure, 5-1. Left heat sink, 5-2. Middle heat sink, 5-3. Right heat sink;

[0025] 7. Filament; 8. Blade; 9. Mode septum; 10. Output antenna; 11. Top pole piece; 12. Bottom pole piece; 13. Output structure; 14. Cathode cap; 15. Anode barrel; 16. Input structure Detailed Implementation

[0026] The technical solution of the present invention will be further described below with reference to specific embodiments. Unless otherwise specified, the structural components and corresponding materials used in the following embodiments can be obtained from conventional commercial channels; unless otherwise specified, the processes and connection methods between structures adopted are all conventional processes and connection methods in the art.

[0027] In the above-down or front-back, left-right and right directions of the structure described in the embodiments of this invention, the positions are determined by the positions shown in the figures of this invention. The positions of the components in the protected structure are not limited to these figures and descriptions, and similar orientations and structures are all within the scope of protection of this invention.

[0028] Embodiment 1

[0029] A magnetron for a same - voltage integrated dual - frequency output microwave oven is provided with two magnetrons with different sizes and frequencies, a heat dissipation structure and a magnetic circuit structure. The two magnetrons share one magnetic circuit structure, and the magnetron part and the heat dissipation structure are arranged inside the magnetic circuit structure. The heat dissipation structure has three parts: a left heat sink, a middle heat sink and a right heat sink. The left heat sink is arranged outside one magnetron and extends to the left, the right heat sink is arranged outside the other magnetron and extends to the right, and the two magnetrons are fixedly connected through the middle heat sink.

[0030] The two magnetrons with different sizes and frequencies are a 2.45GHz magnetron and a 5.8GHz magnetron connected in parallel.

[0031] The 2.45GHz magnetron and the 5.8GHz magnetron are connected into one body through the middle heat sink, and the two magnetrons with different frequencies are sleeved in the same magnetic circuit cover plate. In the present invention, the magnetic circuit is to guide the magnetic field to form a magnetic loop, and the magnetic circuit structure is composed of an upper bottom plate and a lower bottom plate, as shown in Figure 3 , the material is pure iron, and there is no baffle in the front and back. The lower bottom plate of the magnetic circuit is connected to the upper bottom plate by screws.

[0032] The magnetic circuit structure is a cavity formed by combining two "匚" shapes with a large left and a small right. The 2.45GHz magnetron is placed in the large left "匚" shape, and the 5.8GHz magnetron is placed in the similar small "匚" shape on the right, so that there is a certain space between the magnetic circuit structure and the right side of the 2.45GHz lower magnet, and the space between them is appropriate to prevent the magnetic circuits of the two magnetrons from interfering with each other.

[0033] The technical innovation and some technical difficulties in the present invention are as follows: In the design of a conventional dual - frequency output magnetron, two magnetrons with the same size are used, and the frequency difference between the two is dozens of megahertz, and the design is easy. In the present invention, the large frequency difference between the two magnetrons leads to a large size difference, and there are technical difficulties in the structural design. Due to the large size difference between the two magnetrons, directly designing the two magnetrons in one box and using the same voltage source to design them into an integrated type saves space and is convenient for installation, and solves the problem of the placement of the two magnetrons in the microwave oven cavity.

[0034] In the present invention, since the two magnetrons share one magnetic circuit structure, it is necessary to solve the technical problem of magnetic shielding. In the present invention, the space between the cavity in the magnetic circuit structure and the right side of the 2.45GHz lower magnet should be appropriate to prevent the magnetic circuits of the two magnetrons from interfering with each other. The frequency difference between the two magnetrons is large, and the microwave wavelength generated by the 5.8GHz magnetron is shorter, and the standing - wave distribution in the oven cavity is more uniform. Acting together with the 2.45GHz microwave, it can better solve the problem of microwave oven heating uniformity.

[0035] The 2.45GHz magnetron has a black sphere I and a magnet I. The magnet I has an upper magnet I and a lower magnet I. The upper magnet I and the lower magnet I are respectively located near the upper base plate and the lower base plate of the magnetic circuit structure. The output end and the input end of the black sphere I are respectively inserted into the upper magnet I and the lower magnet I, and extend outward through the upper base plate and the lower base plate of the magnetic circuit structure.

[0036] The two magnetrons share a single magnetic circuit structure. A certain distance is maintained between the bottom plate of the magnetic circuit structure and the lower magnet of the 2.45GHz magnetron, and there is also a certain space between the lower magnet I and the right side of the magnetic circuit structure. This appropriate distance prevents crosstalk between the magnetic fields of the two magnetrons. The tops of the upper magnet II in the 5.8GHz magnetron and the upper magnet I in the 2.45GHz magnetron are kept on the same horizontal plane.

[0037] The 5.8GHz magnetron has a black ball II and a magnet II. The magnet II has an upper magnet II and a lower magnet II. The upper magnet II and the lower magnet II are respectively located near the upper base plate and the lower base plate of the magnetic circuit structure. The output end and the input end of the black ball II are respectively inserted into the upper magnet and the lower magnet, and extend outward through the upper base plate and the lower base plate of the magnetic circuit structure.

[0038] Black sphere structure I and black sphere structure II are connected by an intermediate heat sink, thus fixing them together as a single unit. Black sphere I and black sphere II have basically the same external structure, but their sizes differ significantly.

[0039] The two magnetrons use the same voltage source, and in the optimized example, the current flowing through the cathodes of the two magnetrons can also be different.

[0040] Example 2

[0041] Specifically, such as Figure 1 As shown, a magnetron for a microwave oven with integrated dual-frequency output and the same voltage is provided, which includes a 2.45GHz magnetron, a 5.8GHz magnetron, an intermediate heat sink and a magnetic circuit structure connecting the 2.45GHz magnetron and the 5.8GHz magnetron, and the two magnetrons of different frequencies share a single magnetic circuit structure.

[0042] The 2.45GHz magnetron has a black ball I structure 1 and a magnet I 3. The output end of the black ball I 1 is fitted in the upper magnet I 3-1, and the input end of the black ball I 1 is fitted in the lower magnet I 3-2.

[0043] The 5.8GHz magnetron includes: a black sphere II structure 2 and a magnet II 6. The output end of the black sphere II 2 is fitted in the upper magnet II 6-1, and the input end of the black sphere II is fitted in the lower magnet II 6-2.

[0044] like Figure 2In it, two magnetrons share a set of heat dissipation structure 5. The heat dissipation structure is provided with three parts: a left heat sink, a middle heat sink, and a right heat sink. There are 6 pieces each for the left heat sink, the middle heat sink, and the right heat sink. The two magnetrons are fixedly connected through the middle heat sink 5-2 in the middle part.

[0045] As Figure 3 In it, the magnetic circuit structure is a cavity formed by combining two "匚" shapes with a large left and a small right.

[0046] As Figure 1 , Figures 4-7 In it, the black ball structure I and the black ball structure II are connected through the middle heat sink, and thus fixedly connected into one body. The structures of black ball I and black ball II are basically the same, but their sizes are different and the difference is large. Both the black ball structure I and the black ball structure II are provided with output structures, anode barrels, and input structures connected up and down. The cathode structure is arranged in the center of the anode barrel. The cathode structure includes a filament and a cathode cap. The blades arranged in the anode barrel extend radially from the inner circumference of the anode barrel. The diaphragm belt is arranged on the blades. The upper pole shoe and the lower pole shoe are respectively installed in the open ends at the upper and lower ends of the anode barrel.

[0047] Specifically, the black ball I structure in the 2.45GHz magnetron is provided with an anode structure I, a cathode structure I, a magnet I, and a left heat sink套装在磁路结构内的阳极结构Ⅰ、阴极结构Ⅰ、磁铁Ⅰ和左边散热片,以及部份套装在磁路结构内的输入结构Ⅰ和输出结构Ⅰ,位于磁路结构内壁上表面的上磁铁Ⅰ和下表面的下磁铁Ⅰ分别套装在输入结构Ⅰ和输出结构Ⅰ上,输出结构Ⅰ底端插入上磁铁Ⅰ中与阳极桶Ⅰ固定连接,顶端穿过磁路结构上表面向上延伸;输入结构Ⅰ底端插入下磁铁Ⅰ中与阳极桶Ⅰ固定连接,顶端穿过磁路结构上表面向下延伸;

[0048] The anode structure I is provided with an anode barrel I and pole shoes, as well as blades I and diaphragm belt I located in the anode barrel I. The anode barrel I is in an "H" shape, (the anode barrel is a cylindrical barrel, but the cross-sectional view combined with the anode blades looks like an "H" shape) and is located between the upper magnet I and the lower magnet I. The left heat sink is connected to the outer side of the anode barrel; the blades I extend radially from the inner circumference of the anode barrel I, and the space between adjacent blades I forms a resonant cavity. The diaphragm belt I is arranged on the blades I; the pole shoes are provided with an upper pole shoe I and a lower pole shoe I, which are respectively installed in the open ends at the upper and lower ends of the anode barrel I; the cathode structure I is provided with a filament I and a cathode cap I. The filament I is arranged in the central space of the multiple blades I of the anode structure I, and one end of it is fixedly connected to the cathode cap I.

[0049] The black sphere II structure in the 5.8GHz magnetron includes an anode structure II, a cathode structure II, an input structure II, an output structure II, a magnet II, and a right heat sink, all housed within the magnetic circuit structure. It also includes a portion of the input structure II and the output structure II housed within the magnetic circuit structure. An upper magnet II and a lower magnet II are located within the magnetic circuit structure and are respectively housed on the input structure II and the output structure II. The bottom end of the output structure II is inserted into the upper magnet II and fixedly connected to the anode barrel II, while its top end extends upward through the upper surface of the magnetic circuit structure. The bottom end of the input structure II is inserted into the lower magnet I and fixedly connected to the anode barrel II, while its top end extends downward through the upper surface of the magnetic circuit structure.

[0050] The anode structure II includes an anode barrel II and pole shoes, as well as blades II and a partition belt II located inside the anode barrel II. The anode barrel II is H-shaped and located between the upper magnet II and the lower magnet II. The right heat sink is connected to the outer side of the anode barrel. The blades II extend from the inner circumference of the anode barrel II along the radial direction. The space between adjacent blades II forms a resonant cavity. The partition belt II is disposed on the blades II. The pole shoes include an upper pole shoe I and a lower pole shoe II, which are respectively installed in the open ends of the upper and lower ends of the anode barrel II. The cathode structure II includes a filament II and a cathode cap II. The filament II is disposed in the central space of multiple blades II of the anode structure II, and one end of it is fixedly connected to the cathode cap II.

[0051] The structures and corresponding connection methods of other parts not described in the above black sphere, heat dissipation structure, and magnetic circuit structure are conventional structures and connection methods.

[0052] In the 5.8GHz magnetron, the output structure II is equipped with an output antenna II. One end of the output antenna II passes through the top pole shoe II and is fixedly connected to the blade II, while the other end is located at the top port of the output structure II. Similarly, in the 2.45GHz magnetron, the output structure I is equipped with an output antenna I. One end of the output antenna I passes through the top pole shoe I and is fixedly connected to the blade I, while the other end is located at the top port of the output structure I.

[0053] The tops of anode barrel I in the 2.45GHz magnetron and anode barrel II in the 5.8GHz magnetron are kept on the same horizontal plane, and the tops of upper magnet I in the 2.45GHz magnetron and upper magnet II in the 5.8GHz magnetron are kept on the same horizontal plane.

[0054] The invention employs dual-frequency independent output magnetrons of 2.4GHz and 5.8GHz, which can make the standing wave distribution in the microwave oven cavity more uniform and solve the problem of heating uniformity in microwave ovens.

[0055] Second, the two magnetrons use the same voltage source, and their operating voltage is almost exactly the same as that of traditional microwave oven magnetrons. The operating voltage range can be set to 3-5kV, but the cathode currents of the two magnetrons can be different.

[0056] Third, each magnetron has an output power of approximately 400-900W, resulting in a higher total output power compared to a single-tube microwave oven, thus maximizing the effective use of household electricity.

[0057] Fourth, the two magnetrons are designed as an integrated structure, sharing a single magnetic circuit structure. This solves the problems of placing the two magnetrons in the microwave oven and their mutual coupling, thus optimizing the space utilization efficiency of the microwave oven.

[0058] Fifth, the two magnetrons are connected and fixed by a heat sink. Sharing a heat sink can reduce the overall size and improve the heat dissipation performance of a single tube.

[0059] The aforementioned features of this invention enable devices employing this integrated dual-frequency output magnetron structure to be more widely used in civilian and industrial applications.

[0060] The above embodiments / experimental examples are merely illustrative and not intended to limit the implementation methods. Those skilled in the art will recognize that various variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementation methods. However, obvious variations or modifications derived therefrom remain within the scope of this invention.

Claims

1. A magnetron for a dual-frequency output microwave oven with integrated voltage, characterized in that: Two magnetrons with different frequency and size, heat dissipation structure and magnetic circuit structure are provided, the two magnetrons share one magnetic circuit structure, the magnetron part and heat dissipation structure are arranged in the magnetic circuit structure; the heat dissipation structure is provided with three parts of left heat dissipation fin, middle heat dissipation fin and right heat dissipation fin, the left heat dissipation fin is arranged outside one magnetron and extends to the left, the right heat dissipation fin is arranged outside the other magnetron and extends to the right, and the two magnetrons are fixedly connected through the middle heat dissipation fin; wherein the two magnetrons with different frequency are 2.45GHz magnetron and 5.8GHz magnetron in parallel; the two magnetrons adopt the same voltage source.

2. A voltage-integrated dual-frequency output magnetron for a microwave oven according to claim 1, wherein: The 2.45GHz magnetron is provided with a black ball I and a magnet I, the magnet I is provided with an upper magnet I and a lower magnet I, the upper magnet I and the lower magnet I are arranged at positions close to the upper bottom plate of the magnetic circuit structure and the lower bottom plate of the magnetic circuit structure respectively, the output end and the input end of the black ball I are inserted into the upper magnet I and the lower magnet I respectively and extend upward and downward through the upper bottom plate and the lower bottom plate of the magnetic circuit structure.

3. A magnetron for a dual-frequency output microwave oven with integrated voltage as described in claim 2, characterized in that: The lower magnet I is spaced apart from the lower bottom plate of the magnetic circuit structure, and the lower magnet I is spaced apart from the right side of the magnetic circuit structure, so that the magnetic fields of the two magnetrons do not interfere with each other.

4. A voltage-integrated dual-frequency output magnetron for a microwave oven according to claim 1, wherein: The top end of the upper magnet II in the 5.8GHz magnetron and the top end of the upper magnet I in the 2.45GHz magnetron are kept on the same horizontal plane.

5. A magnetron for a dual-frequency output microwave oven with integrated voltage as described in claim 1, characterized in that: The 5.8GHz magnetron is provided with a black ball II and a magnet II, the magnet II is provided with an upper magnet II and a lower magnet II, the upper magnet II and the lower magnet II are arranged at positions close to the upper bottom plate of the magnetic circuit structure and the lower bottom plate of the magnetic circuit structure respectively, the input end and the output end of the black ball II are inserted into the upper magnet II and the lower magnet II respectively and extend upward and downward through the upper bottom plate and the lower bottom plate of the magnetic circuit structure.

6. A voltage-integrated dual-frequency output magnetron for a microwave oven according to claim 1, wherein: The two magnetrons adopt the same voltage source, and the currents flowing through the cathodes of the two magnetrons are different.

7. The voltage-integrated dual-frequency output magnetron for a microwave oven according to claim 1, wherein: The left heat dissipation fin, the middle heat dissipation fin and the right heat dissipation fin are all 4-6 fins.

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