A coaxial output mechanism of a low-power continuous wave magnetron

Abstract

The utility model discloses a kind of coaxial output mechanisms of low-power continuous wave magnetron, it is related to low-power continuous wave magnetron technical field, mainly for solving the output mechanism of existing continuous wave magnetron cannot satisfy the problem of low-power microwave output under specific scene.It includes the output window outer conductor connected with magnetron anode, radio frequency connector female head respectively at two ends, and output window outer conductor is fixed with output window core assembly in it;Output window core assembly includes the impedance transition inner conductor of the multi-section stepped rod body structure gradually increasing in the energy transmission direction section area, and impedance transition inner conductor two ends are connected with anode resonant cavity, inner conductor respectively;And radio frequency connector female head includes a socket connected with inner conductor energy output end.The utility model provides a kind of coaxial output mechanisms of low-power continuous wave magnetron, it can reduce equipment loss, and solved the problem that existing equipment is bulky, and installation flexibility is poor.

Description

Technical Field

[0001] This utility model relates to the field of low-power continuous wave magnetron technology, and in particular to a coaxial output mechanism for a low-power continuous wave magnetron. Background Technology

[0002] Existing continuous wave magnetrons generally employ a coaxial-waveguide antenna radiating output mechanism (such as that used in industrial microwave heating equipment), the structure of which is shown in the attached figure. Figure 1 As shown. When the output mechanism of this type of continuous wave magnetron is working, the microwave energy of the anode resonant cavity of the magnetron anode is radiated into the waveguide excitation cavity through the anode radiating antenna, and then transmitted to the load through the waveguide.

[0003] This type of output mechanism is a good choice for high-power microwave output. However, for low-power microwave output in specific scenarios (such as narrow or complex installation spaces), this type of output mechanism has the following problems: 1. Large size: The waveguide structure needs to meet the cutoff frequency requirements, resulting in a large overall size. For example, the rectangular waveguide of BJ-14 has a frequency range of 1.14 GHz to 1.73 GHz, and its required waveguide cross-sectional size is 165 × 82.5 mm. 2. Poor installation flexibility: Waveguides require strict alignment and fixation, making them difficult to adapt to complex spaces; 3. Complex impedance matching: The design of the transition section from the antenna to the waveguide affects the transmission efficiency (typical loss >5%). Utility Model Content

[0004] The purpose of this invention is to provide a coaxial output mechanism for a low-power continuous wave magnetron, which can reduce equipment losses and solve the problems of large size and poor installation flexibility of existing equipment.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is: a coaxial output mechanism of a low-power continuous wave magnetron, including an output window conductor with one end fixedly connected to the anode of the magnetron and the other end connected to the female head of an RF connector. An output window core assembly is fixedly provided inside the output window conductor, and a grounding diaphragm connected to the output window core assembly is also provided on the inner wall of the output window conductor. The output window core assembly includes an impedance transition inner conductor located inside a vacuum chamber and coaxial with the outer conductor of the output window. The impedance transition inner conductor is a multi-section stepped rod structure with a gradually increasing cross-sectional area along the energy transmission direction. One end of the impedance transition inner conductor is connected to the anode resonant cavity through an anode radiating antenna, and the other end is connected to the inner conductor through an inner conductor transition sleeve. The RF connector female includes a socket connected to the energy output end of the inner conductor.

[0006] As a further improvement of this utility model, the output window conductor includes an output window conductor a portion and an output window conductor b portion coaxially connected in sequence along the energy transmission direction, and the grounding diaphragm is disposed at the connection between the output window conductor a portion and the output window conductor b portion.

[0007] As a further improvement of this utility model, the output window core assembly further includes a transition outer conductor, an output window sleeve, and an output window sealing ceramic, which are sequentially connected along the energy transmission direction and sleeved outside the impedance transition inner conductor; the inner conductor transition sleeve is inserted into the end of the output window sealing ceramic away from the output window sleeve, and the inner conductor transition sleeve and the inner wall of the output window sealing ceramic are sealed together; the end of the transition outer conductor away from the output window sleeve is sealed to the inner wall of the outer conductor a part of the output window. The inner conductor transition sleeve, the transition outer conductor, the output window sleeve, the output window sealing ceramic, and the lower part of the output window outer conductor a together constitute a vacuum chamber for installing the impedance transition inner conductor.

[0008] As a further improvement of this utility model, the grounding diaphragm is connected to the output window cover.

[0009] As a further improvement of this utility model, the RF connector female head further includes an outer conductor sleeved outside the socket, and one end of the outer conductor near the outer conductor b of the output window is fixedly connected to the end face of the outer conductor b of the output window.

[0010] As a further improvement of this utility model, both the outer conductor and the connecting end of the outer conductor b of the output window are provided with connecting flanges, and the two connecting flanges are fixedly connected by a flange connecting sleeve sleeved outside the connecting flanges.

[0011] As a further improvement of this utility model, an insulating sleeve is fixedly provided on the inner wall of the outer conductor, and the insulating sleeve is fixedly sleeved on the outer wall of the energy output end of the inner conductor.

[0012] As a further improvement of this utility model, the inner wall of the outer conductor is provided with a stepped surface for positioning and installing the insulating sleeve, and the inner wall of the outer conductor is also provided with an insulating clamping cylinder for pressing the insulating sleeve onto the stepped surface.

[0013] Beneficial effects Compared with the prior art, the advantages of the coaxial output mechanism of the low-power continuous wave magnetron of this utility model are as follows: 1. In this output mechanism, the coaxial direct connection ensures that energy transmission does not take detours (pure mode), and the impedance transition inner conductor of the multi-section stepped rod structure ensures that energy transmission does not hit the wall (impedance matching); the combination of the two can reduce the power loss of the equipment from >5% to <2%.

[0014] 2. The low-power continuous wave magnetron using this output mechanism eliminates the need for a waveguide structure, thus reducing the overall size of the device by 60% to 90%. Combined with a quick-plug coaxial direct connection design, the device offers flexible installation and is suitable for low-power microwave output in specific scenarios (such as narrow or complex installation spaces). Furthermore, the plug-and-play feature, which eliminates the need for custom waveguides, significantly improves the device's installation compatibility. In addition, the rigid coaxial connection eliminates the risk of displacement and prevents loosening, thereby enhancing the device's resistance to mechanical vibration.

[0015] The present invention will become clearer from the following description and in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the output mechanism of an existing continuous wave magnetron; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a structural diagram showing the connection between the output window core assembly and the external conductor of the output window in this utility model.

[0018] Wherein: 1-Magnetron anode; 11-Anode resonant cavity; 12-Anode radiating antenna; 2-Impedance transition inner conductor; 21-Inner conductor transition sleeve; 22-Transition outer conductor; 23-Output window sleeve; 24-Output window sealing ceramic; 3-Output window outer conductor a part; 4-Output window outer conductor b part; 5-Grounding diaphragm; 6-Inner conductor; 7-Socket; 71-Outer conductor; 72-Insulating sleeve; 73-Insulating clamping cylinder; 8-Flange connecting cylinder. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; of course, they can also refer to a mechanical connection or an electrical connection; furthermore, they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0022] Example: The specific embodiments of this utility model are as follows: Figure 1-3 As shown, a coaxial output mechanism for a low-power continuous wave magnetron includes an output window conductor. One end of the output window conductor is fixedly connected to the magnetron anode 1 by welding, and the other end of the output window conductor is connected to a female RF connector. An output window core assembly is fixed inside the output window conductor, and a grounding diaphragm 5 connected to the output window core assembly is also provided on the inner wall of the output window conductor.

[0023] The output window assembly includes an impedance transition inner conductor 2 located within a vacuum chamber and coaxial with the outer conductor of the output window. This impedance transition inner conductor 2 is a multi-section stepped rod structure with a gradually increasing cross-sectional area along the energy transmission direction. One end of the impedance transition inner conductor 2 is connected to the anode resonant cavity 11 via the anode radiating antenna 12, and the other end is connected to the inner conductor 6 via the inner conductor transition sleeve 21. Additionally, the RF connector female includes a socket 7 connected to the energy output end of the inner conductor 6. In this embodiment, the RF connector female specifically adopts an L29 type RF connector female, which detachably plugs into the L29 type RF connector male, enabling direct energy transmission from the magnetron to the coaxial cable to the load.

[0024] Compared to existing continuous wave magnetron output mechanisms, this low-power continuous wave magnetron, using a direct coaxial connection instead of waveguide radiation, can output the energy from the magnetron anode 1 through the coaxial interface of the RF connector, completing a direct transmission from the magnetron to the coaxial cable to the load. This eliminates the waveguide mode conversion stage and thus eliminates mode conversion loss. Simultaneously, the impedance transition inner conductor 2, with its multi-section stepped rod structure and gradually increasing cross-sectional area along the energy transmission direction, achieves a smooth transition from the impedance of the anode radiating antenna 12 (approximately 60–100 Ω) to the coaxial cable impedance (50 Ω), reducing reflection loss. In other words, the direct coaxial connection ensures that energy transmission avoids detours (mode purity), and the multi-section stepped rod structure ensures that energy transmission avoids obstacles (impedance matching). The combination of these two factors reduces the power loss of the equipment from >5% to <2%.

[0025] Meanwhile, the low-power continuous wave magnetron using this output mechanism eliminates the need for a waveguide structure, thus reducing the overall size of the device by 60% to 90%. Combined with a quick-plug coaxial direct-connect design, the device offers flexible installation and is suitable for low-power microwave output in specific scenarios (such as confined or complex installation spaces). Furthermore, the plug-and-play feature, eliminating the need for custom waveguides, significantly improves the device's installation compatibility. Additionally, the rigid coaxial connection eliminates the risk of displacement and loosening, thereby enhancing the device's resistance to mechanical vibration.

[0026] In this embodiment, the output window conductor includes an output window conductor a portion 3 and an output window conductor b portion 4 coaxially connected in sequence along the energy transmission direction. The output window conductor a portion 3 and the output window conductor b portion 4 are connected by a thread; the end of the output window conductor a portion 3 away from the output window conductor b portion 4 is welded to the magnetron anode 1; the end of the output window conductor b portion 4 away from the output window conductor a portion 3 is detachably connected to the RF connector female connector. A grounding diaphragm 5 is disposed at the connection point between the output window conductor a portion 3 and the output window conductor b portion 4.

[0027] Regarding the output window assembly, it also includes a transition outer conductor 22, an output window sleeve 23, and an output window sealing ceramic 24, which are sequentially connected along the energy transmission direction and sleeved outside the impedance transition inner conductor 2. The inner conductor transition sleeve 21 is inserted into the end of the output window sealing ceramic 24 away from the output window sleeve 23, and the inner conductor transition sleeve 21 and the inner wall of the output window sealing ceramic 24 are sealed together. The end of the transition outer conductor 22 away from the output window sleeve 23 is sealed to the inner wall of the output window outer conductor a part 3. The inner conductor transition sleeve 21, the transition outer conductor 22, the output window sleeve 23, the output window sealing ceramic 24, and the lower part of the output window outer conductor a part 3 together constitute a vacuum chamber for mounting the impedance transition inner conductor 2.

[0028] In this embodiment, as Figure 3 As shown, the inner conductor transition sleeve 21 is directly welded to the output window sealing ceramic 24 and the impedance transition inner conductor 2; the output window sealing ceramic 24 is welded to the output window sleeve 23, the output window sleeve 23 is welded to the transition outer conductor 22, and the transition outer conductor 22 is welded to the output window outer conductor a part 3. At the same time, the grounding diaphragm 5 is connected to the output window sleeve 23.

[0029] Regarding the female RF connector, it also includes an outer conductor 71 sleeved outside the socket 7. One end of the outer conductor 71 near the outer conductor b part 4 of the output window is fixedly connected to the end face of the outer conductor b part 4 of the output window. In this embodiment, both the outer conductor 71 and the connecting end of the outer conductor b part 4 of the output window are provided with connecting flanges, and the two connecting flanges are fixedly connected by a flange connecting sleeve 8 sleeved outside the connecting flanges.

[0030] Meanwhile, an insulating sleeve 72 is fixedly provided on the inner wall of the outer conductor 71, and the insulating sleeve 72 is fixedly sleeved on the outer wall of the energy output end of the inner conductor 6. In this embodiment, the inner wall of the outer conductor 71 is provided with a stepped surface for positioning and installing the insulating sleeve 72, and the inner wall of the outer conductor 71 is also provided with an insulating compression cylinder 73 for pressing the insulating sleeve 72 onto the stepped surface.

[0031] The specific functions of each component in this coaxial output mechanism are as follows: Anode radiating antenna 12: resonant cavity impedance transition, power extraction; Impedance transition inner conductor 2: antenna impedance transition, power transmission; Inner conductor 6: connection, conduction, power transmission; Inner conductor transition sleeve 21: vacuum sealing, connection, power transmission; Socket 7: connection to L29 type RF connector male head, connection, power output; Transition outer conductor 22: vacuum sealing, welding, and positioning; Output window sleeve 23: vacuum sealing, welding, and positioning; Output window sealing ceramic 24: insulation, vacuum sealing, welding, and positioning; Grounding diaphragm 5: high-voltage grounding; Output window outer conductor a part 3: welding, vacuum sealing, positioning, and magnetic conduction; Output window outer conductor b part 4: connection, fixing, and positioning; Flange connecting cylinder 8: for connection and fixation; insulating sleeve 72: for high voltage isolation from ground; outer conductor 71: for connection and fixation; insulating clamping cylinder 73: for connection and fixation.

[0032] The present invention has been described above in conjunction with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations made in accordance with the essence of the present invention.

Claims

1. A coaxial output mechanism for a low power continuous wave magnetron, characterized by, It includes an output window outer conductor with one end fixedly connected to the magnetron anode (1) and the other end connected to the RF connector female head. An output window core assembly is fixedly provided inside the output window outer conductor, and a grounding diaphragm (5) connected to the output window core assembly is also provided on the inner wall of the output window outer conductor. The output window core assembly includes an impedance transition inner conductor (2) located in a vacuum chamber and coaxial with the output window outer conductor. The impedance transition inner conductor (2) is a multi-section stepped rod structure with a gradually increasing cross-sectional area along the energy transmission direction. One end of the impedance transition inner conductor (2) is connected to the anode resonant cavity (11) through the anode radiation antenna (12), and the other end is connected to the inner conductor (6) through the inner conductor transition sleeve (21). The RF connector female head includes a socket (7) connected to the energy output end of the inner conductor (6).

2. The coaxial output mechanism of the low-power continuous wave magnetron according to claim 1, characterized in that, The output window conductor includes an output window conductor a part (3) and an output window conductor b part (4) connected coaxially in the energy transmission direction. The grounding diaphragm (5) is disposed at the connection between the output window conductor a part (3) and the output window conductor b part (4).

3. The coaxial output mechanism of the low-power continuous wave magnetron according to claim 2, characterized in that, The output window core assembly also includes a transition outer conductor (22), an output window sleeve (23), and an output window sealing ceramic (24) that are sequentially connected along the energy transmission direction and sleeved outside the impedance transition inner conductor (2); the inner conductor transition sleeve (21) is inserted into the end of the output window sealing ceramic (24) away from the output window sleeve (23), and the inner conductor transition sleeve (21) and the inner wall of the output window sealing ceramic (24) are sealed together; the end of the transition outer conductor (22) away from the output window sleeve (23) is sealed together with the inner wall of the output window outer conductor a part (3); The inner conductor transition sleeve (21), the transition outer conductor (22), the output window sleeve (23), the output window sealing ceramic (24), and the lower part of the output window outer conductor a (3) together constitute a vacuum chamber for installing the impedance transition inner conductor (2).

4. The coaxial output mechanism of the low-power continuous wave magnetron according to claim 3, characterized in that, The grounding diaphragm (5) is connected to the output window cover (23).

5. The coaxial output mechanism of the low-power continuous-wave magnetron according to any one of claims 2-4, characterized in that, The female RF connector also includes an outer conductor (71) sleeved outside the socket (7), and the end of the outer conductor (71) near the outer conductor b part (4) of the output window is fixedly connected to the end face of the outer conductor b part (4).

6. The coaxial output mechanism of the low-power continuous wave magnetron according to claim 5, characterized in that, The outer conductor (71) and the outer conductor b part (4) of the output window are both provided with connecting flanges, and the two connecting flanges are fixedly connected by a flange connecting sleeve (8) sleeved outside the connecting flange.

7. The coaxial output mechanism of the low-power continuous wave magnetron according to claim 5 or 6, characterized in that, An insulating sleeve (72) is fixedly provided on the inner wall of the outer conductor (71), and the insulating sleeve (72) is fixedly sleeved on the outer wall of the energy output end of the inner conductor (6).

8. The coaxial output mechanism of the low-power continuous wave magnetron according to claim 7, characterized in that, The inner wall of the outer conductor (71) is provided with a stepped surface for positioning and installing the insulating sleeve (72), and the inner wall of the outer conductor (71) is also provided with an insulating compression cylinder (73) for pressing the insulating sleeve (72) onto the stepped surface.

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