Magnetic circuit structure and 2450MHz / 15kW continuous wave magnetron

Abstract

The utility model discloses a magnetic circuit structure and a 2450MHz / 15kW continuous wave magnetron, the magnetic circuit structure comprises a first pole shoe and a second pole shoe, and the first pole shoe and the second pole shoe are coaxially opposite up and down and are distributed at intervals; the first pole shoe is provided with a first truncated conical surface and a central hole, and one end of the central hole is provided with a second truncated conical surface; the second pole shoe is provided with a third truncated conical surface and a conical groove, and the diameter of the conical groove is gradually reduced from one end facing the notch of the second pole shoe to one end of the groove bottom; the diameter of a groove opening of the conical groove is 14-47 mm, and the length of a generatrix of the conical groove is 1-22 mm. According to the utility model, the uniformity of a central magnetic field area between the first pole shoe and the second pole shoe is greatly improved, and the power output stability of the magnetron in long-term operation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetrons, in particular to a magnetic circuit structure and a 2450MHz / 15kW continuous wave magnetron. Background Art

[0002] In the process of modern scientific and technological development, 2450MHz / 15kW continuous wave magnetron plays an important role in many fields such as industry, medical treatment, and communications due to its unique performance.

[0003] However, the existing 2450MHz / 15kW continuous wave magnetron has certain limitations in terms of magnetic circuit structure. At present, the existing technology generally improves the Gaussian flux density at the center of the magnetron by optimizing the magnetic circuit of the magnetron, but ignores the important influence of the pole shoe structure on the uniformity of the magnetic field, resulting in low magnetic field uniformity. The magnetic field uniformity has an important impact on the performance of the magnetron. The uneven magnetic field will cause the movement trajectory of electrons in the magnetron to be disordered. As the key carrier of microwave generation, the unstable movement of electrons makes it difficult to achieve the optimal state of interaction with the microwave field. The direct consequence is the fluctuation of microwave output power and the deterioration of stability. Therefore, in order to meet the demand for high performance of 2450MHz / 15kW continuous wave magnetrons in various application fields, there is an urgent need for a new magnetic circuit structure to effectively improve the uniformity of the magnetic field, thereby improving the overall performance of the magnetron. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a magnetic circuit structure and a 2450MHz / 15kW continuous wave magnetron, so as to overcome the defect of poor magnetic field uniformity of the existing magnetron magnetic circuit structure.

[0005] The utility model adopts a technical solution to solve its technical problems: a magnetic circuit structure, comprising: a first pole shoe and a second pole shoe, the first pole shoe and the second pole shoe being coaxially opposed to each other and spaced apart; a first truncated conical surface is provided along an outer contour of an end surface of the first pole shoe facing the second pole shoe, and a center hole is provided in the middle of the first pole shoe, and a second truncated conical surface is provided at an end of the center hole facing the second pole shoe; a third truncated conical surface is provided along an outer contour of an end surface of the second pole shoe facing the first pole shoe, and a conical groove is provided at a middle position of an end surface of the second pole shoe facing the first pole shoe, which is coaxially distributed with the center hole, and the diameter of the conical groove gradually decreases from an end of the notch facing the second pole shoe toward an end of the groove bottom;

[0006] The notch diameter and busbar length of the tapered slot are 14-47 mm and 1-22 mm, respectively.

[0007] As a further improvement of the present invention, the second pole shoe is provided with an oblique hole penetrating through two opposite end faces thereof, and the axis of the oblique hole is distributed at an acute angle to the axis of the second pole shoe.

[0008] As a further improvement of the present invention, the first pole shoe and the second pole shoe are both circular, and the thickness of the second pole shoe is greater than the thickness of the first pole shoe.

[0009] As a further improvement of the present invention, the magnetic circuit structure also includes a first magnet, a second magnet and a yoke fixedly connected between the first magnet and the second magnet, the first pole shoe is fixed at the opening in the middle of the first magnet, the second pole shoe is fixed at the opening in the middle of the second magnet, and the first pole shoe and the second pole shoe are both inside the yoke.

[0010] As a further improvement of the present invention, the materials used for the first pole shoe and the second pole shoe are both soft magnetic materials.

[0011] The utility model also provides a 2450MHz / 15kW continuous wave magnetron, comprising: the magnetic circuit structure as described above.

[0012] The beneficial effects of the present invention are as follows: the present invention provides a magnetic circuit structure and a 2450MHz / 15kW continuous wave magnetron, wherein the magnetic circuit structure optimizes the distribution of magnetic lines of force by innovatively designing specific geometric shapes on the first pole shoe and the second pole shoe, that is, arranging a first truncated conical surface and a second truncated conical surface on the first pole shoe, and arranging a third truncated conical surface and a conical groove on the second pole shoe, thereby greatly improving the uniformity of the central magnetic field region between the first pole shoe and the second pole shoe. Such uniform magnetic field distribution helps electrons to move along more stable and regular trajectories in the magnetron, thereby improving the stability of microwave generation. At the same time, precise definition of each key structural parameter is the key to achieving improved magnetic field uniformity. These optimized parameters cooperate with each other and act together on the magnetic circuit structure to ensure the overall functional realization and stable operation of the 2450MHz / 15kW continuous wave magnetron. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0014] Figure 1 This is a three-dimensional diagram of the first embodiment of the magnetic circuit structure of the present utility model;

[0015] Figure 2This is a cross-sectional view of the first embodiment of the magnetic circuit structure of the present utility model;

[0016] Figure 3 A three-dimensional diagram of the first pole shoe of the first embodiment of the magnetic circuit structure of the present invention;

[0017] Figure 4 A three-dimensional diagram of the second pole shoe of the first embodiment of the magnetic circuit structure of the present invention;

[0018] Figure 5 This is a schematic diagram of a first embodiment of the magnetic circuit structure of the present invention with a central magnetic field region circular line;

[0019] Figure 6 A magnetic flux density curve diagram on a circular line in the central magnetic field region of the first embodiment of the magnetic circuit structure of the present utility model;

[0020] Figure 7 This is a cross-sectional view of the second embodiment of the magnetic circuit structure of the present utility model;

[0021] Figure 8 A magnetic flux density curve diagram on a circular line in the central magnetic field region of the second embodiment of the magnetic circuit structure of the present utility model;

[0022] Figure 9 This is a cross-sectional view of the third embodiment of the magnetic circuit structure of the present utility model;

[0023] Figure 10 This is a magnetic flux density curve diagram on the toroidal line of the central magnetic field region of the third embodiment of the magnetic circuit structure of the present utility model.

[0024] The following description is made with reference to the accompanying drawings:

[0025] 1. First pole shoe; 101. First truncated conical surface; 102. Center hole; 103. Second truncated conical surface; 2. Second pole shoe; 201. Third truncated conical surface; 202. Conical groove; 203. Oblique hole; 3. First magnet; 4. Second magnet; 5. Magnetic yoke. DETAILED DESCRIPTION

[0026] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0028] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0029] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0030] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples, however, one skilled in the art will appreciate that the examples can be practiced without these specific details.

[0031] The following describes the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0032] Example 1

[0033] See Figures 1 to 5 The utility model provides a magnetic circuit structure, including a first pole shoe 1 and a second pole shoe 2, the first pole shoe 1 and the second pole shoe 2 are opposite to each other and spaced apart, and the axes of the first pole shoe 1 and the second pole shoe 2 coincide.

[0034] Among them, a central hole 102 is provided along the axis in the middle of the first pole shoe 1, which passes through its upper and lower end surfaces. The central hole 102 is used for the cathode core rod assembly of the 2450MHz / 15kW continuous wave magnetron to pass through, and allows the filament installed at the lower end of the cathode core rod assembly to be located in the central magnetic field area between the first pole shoe 1 and the second pole shoe 2.

[0035] like Figure 2 As shown, a first truncated conical surface 101 is provided along the outer contour of one end surface of the first pole shoe 1 facing the second pole shoe 2 (i.e., the lower end surface of the first pole shoe 1), and a second truncated conical surface 103 is provided at one end of the center hole 102 facing the second pole shoe 2 (i.e., the lower end of the center hole 102).

[0036] Furthermore, a third truncated conical surface 201 is provided along the outer contour of the end surface of the second pole shoe 2 facing the first pole shoe 1 (i.e., the upper end surface of the second pole shoe 2). Furthermore, a conical groove 202 is provided in the middle of the end surface of the second pole shoe 2 facing the first pole shoe 1, coaxially with the center hole 102. The depth of the conical groove 202 is less than the thickness of the second pole shoe 2; that is, the conical groove 202 does not penetrate the lower end surface of the second pole shoe 2. The diameter of the conical groove 202 gradually decreases from the end facing the second pole shoe 2 toward the end at the bottom of the groove.

[0037] It can be understood that the first truncated conical surface 101 , the second truncated conical surface 103 and the third truncated conical surface 201 are all frustum surfaces, and the inner wall of the conical groove 202 is a conical surface.

[0038] Preferably, the busbar length of the first truncated conical surface 101 is 0-5 mm; the busbar length of the second truncated conical surface 103 is 0-10 mm; the busbar length of the third truncated conical surface 201 is 0-8 mm; the notch diameter and busbar length of the tapered groove 202 are 14-47 mm and 1-22 mm, respectively.

[0039] The magnetic circuit structure of the present invention optimizes the distribution of magnetic lines of force by innovatively designing the specific geometric shapes on the first pole shoe 1 and the second pole shoe 2, that is, arranging the first truncated conical surface 101 and the second truncated conical surface 103 on the first pole shoe 1, and arranging the third truncated conical surface 201 and the conical groove 202 on the second pole shoe 2, thereby greatly improving the uniformity of the central magnetic field area between the first pole shoe 1 and the second pole shoe 2. This uniform magnetic field distribution helps electrons move along a more stable and regular trajectory in the magnetron, thereby improving the stability of microwave generation; at the same time, Key structural parameters, such as the busbar length of the first truncated conical surface 101 (0-5 mm), the busbar length of the second truncated conical surface 103 (0-10 mm), the busbar length of the third truncated conical surface 201 (0-8 mm), and the notch diameter and busbar length of the tapered slot 202 (14-47 mm and 1-22 mm, respectively), are precisely defined and are key to achieving improved magnetic field uniformity. These optimized parameters work together to influence the magnetic circuit structure, ensuring the magnetron achieves optimal performance at the specified 2450 MHz frequency and 15 kW power.

[0040] Among them, the first truncated conical surface 101, the second truncated conical surface 103 and the third truncated conical surface 201 can all be formed by chamfering on the corresponding first pole shoe 1 / second pole shoe 2, and the conical groove 202 can be machined at the center position of the upper end surface of the second pole shoe 2. This processing method is simple and feasible, easy to implement, reduces the difficulty and cost of production and processing, and is conducive to the large-scale production and application of the magnetic circuit structure.

[0041] See Figure 3 and Figure 4 The first pole shoe 1 and the second pole shoe 2 are both circular, and the thickness of the second pole shoe 2 is greater than that of the first pole shoe 1. The circular design of the first pole shoe 1 and the second pole shoe 2 makes the magnetic field distribution more symmetrical and uniform, while the different thickness settings are optimized according to the different positions of the first pole shoe 1 and the second pole shoe 2 in the magnetic circuit, further improving the magnetic field performance and the reliability of the magnetic circuit structure.

[0042] In addition, flanges are provided on the outer circumferential surfaces of the first pole shoe 1 and the second pole shoe 2 to facilitate welding and fixing with other components of the magnetic circuit structure.

[0043] See again Figure 2The second pole piece 2 is provided with an inclined hole 203 extending through its upper and lower opposite ends. The upper end of the inclined hole 203 is offset toward the outer contour of the second pole piece 2, while the lower end of the inclined hole 203 is tilted toward the axis of the second pole piece 2, forming an acute angle between the axis of the inclined hole 203 and the axis of the second pole piece 2. The inclined hole is used to pass through the antenna of the 2450MHz / 15kW continuous-wave magnetron, facilitating antenna installation and ensuring the antenna's proper placement within the magnetic circuit structure. This avoids excessive interference with the magnetic field distribution, helps maintain magnetic field stability and uniformity, and further enhances the overall performance of the magnetron.

[0044] Furthermore, the magnetic circuit structure of the present invention further includes a first magnet 3 , a second magnet 4 , and a yoke 5 fixedly connected between the first magnet 3 and the second magnet 4 .

[0045] See Figure 1 and Figure 2 The first magnet 3 and the second magnet 4 are also coaxially opposed and spaced apart. Two tile-shaped yokes 5 are provided and symmetrically fixed between the first magnet 3 and the second magnet 4. A circular hole is formed in the middle of each of the first magnet 3 and the second magnet 4. The first pole shoe 1 is fixed to the bottom of the circular hole of the first magnet 3, and the second pole shoe 2 is fixed to the top of the circular hole of the second magnet 4. The first pole shoe 1 and the second pole shoe 2 are both located in the internal space formed by the two magnetic yokes 5.

[0046] The utility model forms an efficient magnetic field confinement and conduction circuit through the first magnet 3, the second magnet 4 and the magnetic yoke 5 connected therebetween. The first pole shoe 1 and the second pole shoe 2 are respectively fixed at the openings in the middle of the first magnet 3 and the second magnet 4 and are located inside the magnetic yoke 5, so that the magnetic field can be highly concentrated in the central area between the first pole shoe 1 and the second pole shoe 2, thereby improving the utilization rate of the magnetic field and enhancing the reliability of the entire magnetic circuit structure.

[0047] In this embodiment, both the first magnet 3 and the second magnet 4 are permanent magnets.

[0048] Preferably, the first pole shoe 1 and the second pole shoe 2 are both made of soft magnetic material, that is, a magnetic material with low coercive force and high magnetic permeability. Generally speaking, the coercive force ranges from 10 to 100 A / m, and the magnetic permeability is greater than 1000 H / m, such as pure iron or iron-nickel alloy, which can better converge and conduct magnetic lines of force, enhance the magnetic field strength, and further optimize the uniformity of the magnetic field.

[0049] Specifically, the busbar length of the first truncated conical surface 101 in this embodiment is 5 mm, the busbar length of the second truncated conical surface 103 is 9.9 mm, the busbar length of the third truncated conical surface 201 is 3 mm, and the notch diameter and busbar length of the tapered groove 202 are 44.3 mm and 10.5 mm, respectively.

[0050] To further demonstrate the technical benefits of the magnetic circuit structure of the present invention, this embodiment also tested the magnetic flux density in the central magnetic field region of the magnetic circuit structure using simulation software. The parameters of the first truncated conical surface 101 and second truncated conical surface 103 of the first pole piece 1, as well as the third truncated conical surface 201 and conical groove 202 of the second pole piece 2, were set according to the values ​​described above. The configuration of the remaining components of the magnetic circuit structure, other than the first and second pole pieces 1 and 2, was identical to that of a conventional 2450MHz / 15kW continuous-wave magnetron.

[0051] Figure 5 The dotted line in FIG. 1 represents the circumferential line of the central magnetic field region between the first pole shoe 1 and the second pole shoe 2 , specifically a circular line with a radius of 20 mm.

[0052] like Figure 5 and Figure 6 As shown, the magnetic flux density is tested along the circumferential line, where the horizontal axis represents the distance (mm) from a certain point on the circumferential line to the starting measurement point in the clockwise direction, and the vertical axis represents the magnetic flux density at the point in millitesla (mT). Figure 6 It can be seen that B max is the maximum magnetic flux density at m1, B min is the minimum magnetic flux density at m2, we can get: B max -B min ≈5.72 (mT).

[0053] It can be seen that this embodiment significantly controls the magnetic field fluctuation in the central area of ​​the magnetron by optimizing the structure of the first pole shoe 1 and the second pole shoe 2, so that the magnetic flux density fluctuation is controlled within 10 millitesla, and the magnetic field fluctuation coefficient in the target area is reduced from ±5% of the traditional design to within ±1.5%, thereby avoiding local overcharging of the local magnetic field and improving the uniformity of the magnetic field.

[0054] Example 2

[0055] See Figure 7 The difference between this embodiment and the first embodiment is that the parameters of the first truncated conical surface 101 , the second truncated conical surface 103 , the third truncated conical surface 201 and the conical groove 202 are different.

[0056] Specifically, in this embodiment, the busbar length of the first truncated conical surface 101 is 0 mm (that is, there is no first truncated conical surface 101 structural design on the first pole shoe 1), the busbar length of the second truncated conical surface 103 is 6.5 mm, the busbar length of the third truncated conical surface 201 is 0 mm (that is, there is no third truncated conical surface 201 structural design on the second pole shoe 2), and the slot diameter and busbar length of the conical slot 202 are 41 mm and 20.5 mm, respectively.

[0057] Similar to the embodiment, this embodiment tests the magnetic flux density on the toroidal line in the central magnetic field region of the magnetic circuit structure using simulation software.

[0058] like Figure 8 As shown, the magnetic flux density of the central magnetic field area is tested along the toroidal line, B max is the maximum magnetic flux density at m1, B min is the minimum magnetic flux density at m2, we can get: B max -B min ≈6.89 (mT).

[0059] It can be seen that this embodiment can also significantly control the magnetic field fluctuations in the central area of ​​the magnetron by optimizing the structure of the first pole shoe 1 and the second pole shoe 2, so that the magnetic flux density fluctuations are controlled within 10 millitesla, avoiding local overcharging of the local magnetic field and improving the uniformity of the magnetic field.

[0060] Example 3

[0061] See Figure 9 The difference between this embodiment and the first embodiment is that the parameters of the first truncated conical surface 101 , the second truncated conical surface 103 , the third truncated conical surface 201 and the conical groove 202 are different.

[0062] Specifically, in this embodiment, the busbar length of the first truncated conical surface 101 is 3 mm, the busbar length of the second truncated conical surface 103 is 0 mm (that is, there is no second truncated conical surface 103 structural design on the first pole shoe 1), the busbar length of the third truncated conical surface 201 is 3 mm, and the slot diameter and busbar length of the conical slot 202 are 43 mm and 22 mm, respectively.

[0063] Similar to the embodiment, this embodiment tests the magnetic flux density on the toroidal line in the central magnetic field region of the magnetic circuit structure using simulation software.

[0064] like Figure 10 As shown, the magnetic flux density of the central magnetic field area is tested along the toroidal line, B max is the maximum magnetic flux density at m1, B min is the minimum magnetic flux density at m2, we can get: B max -B min ≈6.54 (mT).

[0065] It can be seen that this embodiment can also significantly control the magnetic field fluctuations in the central area of ​​the magnetron by optimizing the structure of the first pole shoe 1 and the second pole shoe 2, so that the magnetic flux density fluctuations are controlled within 10 millitesla, avoiding local overcharging of the local magnetic field and improving the uniformity of the magnetic field.

[0066] In addition, the present invention further provides a 2450MHz / 15kW continuous-wave magnetron, comprising: a magnetic circuit structure as described in any one of Embodiments 1 to 3. By applying the optimized magnetic circuit structure to the 2450MHz / 15kW continuous-wave magnetron, the present invention significantly improves the performance of the magnetron. A more uniform magnetic field stabilizes electron motion, and the long-term power output stability of the magnetron is improved, thereby meeting the high-performance and high-reliability requirements of this type of continuous-wave magnetron in fields such as industry, medicine, and communications, and expanding its application in related fields.

[0067] It should be noted that the present invention focuses on innovative design of the magnetic circuit structure of the 2450MHz / 15kW continuous-wave magnetron to address the issue of poor magnetic field uniformity. Beyond the improved magnetic circuit structure of the present invention, the remaining structures of the 2450MHz / 15kW continuous-wave magnetron, including but not limited to the cathode assembly, anode resonant cavity, and input and output structures, all utilize mature existing technologies in the field. These existing technologies have been widely used and verified in numerous similar products, demonstrating excellent performance and stability. They effectively work with the innovative magnetic circuit structure of the present invention to ensure the overall functional realization and stable operation of the 2450MHz / 15kW continuous-wave magnetron.

[0068] The same or similar parts between the various embodiments in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0069] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A magnetic circuit structure comprising a first pole shoe (1) and a second pole shoe (2), wherein the first pole shoe (1) and the second pole shoe (2) are coaxially opposed to each other and spaced apart; characterized in that: The first pole shoe (1) is provided with a first truncated conical surface (101) along the outer contour of one end surface facing the second pole shoe (2), and a center hole (102) is provided in the middle of the first pole shoe (1), and a second truncated conical surface (103) is provided at one end of the center hole (102) facing the second pole shoe (2); the second pole shoe (2) is provided with a third truncated conical surface (201) along the outer contour of one end surface facing the first pole shoe (1), and a conical groove (202) coaxially distributed with the center hole (102) is provided at the middle position of one end surface of the second pole shoe (2) facing the first pole shoe (1), and the diameter of the conical groove (202) gradually decreases from the groove end facing the second pole shoe (2) toward the groove bottom end; The notch diameter and busbar length of the tapered slot (202) are 14-47 mm and 1-22 mm, respectively.

2. The magnetic circuit structure according to claim 1, characterized in that: The second pole shoe (2) is provided with an inclined hole (203) penetrating two opposite end faces thereof, and the axis of the inclined hole (203) is distributed at an acute angle to the axis of the second pole shoe (2).

3. The magnetic circuit structure according to claim 1, wherein: The first pole shoe (1) and the second pole shoe (2) are both circular, and the thickness of the second pole shoe (2) is greater than the thickness of the first pole shoe (1).

4. The magnetic circuit structure according to claim 1, wherein: The magnetic yoke (5) is fixedly connected between the first magnet (3) and the second magnet (4), wherein the first pole shoe (1) is fixed to an opening in the middle of the first magnet (3), the second pole shoe (2) is fixed to an opening in the middle of the second magnet (4), and the first pole shoe (1) and the second pole shoe (2) are both located inside the magnetic yoke (5).

5. The magnetic circuit structure according to claim 1, wherein: The materials used for the first pole shoe (1) and the second pole shoe (2) are both soft magnetic materials.

6. A 2450MHz / 15kW continuous wave magnetron, characterized by: The magnetic circuit structure comprises the magnetic circuit structure according to any one of claims 1 to 5.

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