A tuning device and a tuning method thereof, and a terahertz trapezoidal expansion cavity

Abstract

The present disclosure provides a tuning device, which is used for a terahertz trapezoidal expansion action cavity, including: a tuning fixing frame, which is arranged on the cavity; a tuning assembly, which is arranged on the tuning fixing frame, including: a tuning piston located in the cavity, a tuning piston rod penetrating the tuning fixing frame, a tuning slider and a tuning screw located in the tuning fixing frame; one end of the tuning piston rod is connected to the tuning piston, and the other end thereof is connected to the tuning slider, and the tuning screw is connected to the tuning slider, wherein the tuning screw is rotated under the action of an external force to push the tuning slider, so as to drive the tuning piston rod and the tuning piston to move, so as to adjust the working frequency of the cavity. The present disclosure also provides a tuning method of a tuning device and a terahertz trapezoidal expansion action cavity.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vacuum electronic devices, and in particular to a tuning device and a tuning method thereof, and a terahertz trapezoidal expansion cavity. Background Art

[0002] The cavity of a terahertz extended action device is generally a trapezoidal multi-gap cavity. The structure and size of the cavity determine its resonant frequency and inherent quality factor, while its loaded quality factor is determined by the material properties. When the size deviates from the design value and the material selection is different, the physical properties of the cavity will change, which in turn affects the working characteristics of the device. The mechanical tuning technology of the extended action cavity corrects these deviations in the development process to a certain extent.

[0003] The terahertz trapezoidal expansion cavity usually adopts inductive tuning. Inductive tuning is to change the volume and inductance of the cavity by moving the inductive tuning block in the resonant cavity, thereby changing the frequency of the cavity. At the same time, changing the tuning material can change the loaded quality factor of the cavity. In the tuning structure, the use of bellows can isolate the vacuum inside the tube and the atmosphere outside the tube, and the expansion and contraction characteristics of the bellows can be used to achieve axial reciprocating repeated adjustment; or a composite diaphragm seal can be used, and a tuning structure based on lever adjustment can be used to adjust the cavity size using the elasticity of the composite diaphragm. However, as microwave vacuum electronic devices develop towards the terahertz direction, the size of the bellows in the tuning mechanism is required to be smaller and smaller, and the thickness of the diaphragm is required to be thinner and thinner.

[0004] The tuning mechanism in the prior art has the following technical defects: 1) There are two main tuning mechanism methods for the terahertz trapezoidal expansion cavity. One is the small-size bellows method, but the development cost of the small-size bellows is expensive and there are great difficulties in engineering implementation; 2) The other is the composite diaphragm method. The composite diaphragm is required to be very thin, and the lever-type tuning structure is complex, which makes welding very difficult and risky. Summary of the invention

[0005] In order to solve the above problems in the prior art, the present disclosure provides a tuning device and a tuning method thereof, and a terahertz trapezoidal expansion cavity. The tuning device has the characteristics of simple structure and easy operation, and has a structural locking function. The tuning size is stable, and it gets rid of the dependence of traditional tuning technology on bellows, avoids the welding difficulty and risk brought by the composite diaphragm, and meets the tuning requirements of a small-sized terahertz trapezoidal expansion cavity.

[0006] The first aspect of the present disclosure provides a tuning device, including: the tuning device is used for a terahertz trapezoidal expansion action cavity, including: a tuning fixing frame, which is arranged on the cavity; a tuning component, which is arranged on the tuning fixing frame, including: a tuning piston located in the cavity, a tuning piston rod penetrating the tuning fixing frame, a tuning slider and a tuning screw located in the tuning fixing frame; one end of the tuning piston rod is connected to the tuning piston, and the other end thereof is connected to the tuning slider, and the tuning screw is connected to the tuning slider, wherein the tuning screw is rotated under the action of an external force to push the tuning slider, so as to drive the tuning piston rod and the tuning piston to move, so as to adjust the working frequency of the cavity.

[0007] Furthermore, the tuning fixture and the cavity are sealed and connected by a stamping sheet.

[0008] Furthermore, the tuning device also includes: a locking screw, which is arranged opposite to the tuning screw and is used to lock the position of the tuning assembly after the tuning piston moves to the preset position.

[0009] Furthermore, the tuning piston is made of oxygen-free copper material or monel material.

[0010] Furthermore, the distance the tuning piston moves is proportional to the number of turns by which the tuning screw 5 is rotated under the action of the external force.

[0011] Furthermore, the stamping sheet and the tuning piston rod are both made of nickel-copper alloy material.

[0012] Furthermore, the thickness of the punching sheet is 0.1 mm to 0.2 mm.

[0013] Furthermore, the tuning bracket is made of brass material or non-magnetic stainless steel material.

[0014] The second aspect of the present disclosure provides a tuning method for the tuning device provided by the first aspect of the present disclosure, comprising: installing the tuning device on the cavity to be tuned; rotating the tuning screw to push the tuning slider to drive the tuning piston rod and the tuning piston to move, thereby adjusting the working frequency of the cavity; after the tuning piston moves to the preset position, rotating the locking screw to lock the position of the tuning assembly.

[0015] The third aspect of the present disclosure provides a terahertz trapezoidal expansion effect, including: the tuning device provided by the first aspect of the present disclosure.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] (1) Compared with the external tuning mechanism of the traditional tuning mechanism, the tuning device provided by the present disclosure has a simple structure. The tuning device sets a tuning slider in the tuning fixing frame, uses a tuning screw to adjust the position of the tuning slider, and uses a locking screw to make the device have a position locking function. The tuning device is not only simple in structure and reliable in performance, but also saves the development of small-sized springs.

[0018] (2) The tuning device uses a tuning piston rod and a stamping sheet. When the tuning slider moves, it drives the tuning piston rod and the tuning piston to move, thereby changing the cavity frequency. When the tuning piston rod moves, the stamping sheet can produce a certain deformation, which can ensure the sealing of the device, avoid the welding difficulty and risk brought by the composite diaphragm, and get rid of the development dependence on small-sized bellows.

[0019] (3) The tuning device is small in size and light in weight. For example, the mass of the device in the W-band extension device is less than 0.05 kg, and the lateral width of the klystron is only increased by 16 mm. The current microwave vacuum electronic devices are developing in the direction of high frequency and compactness. The device is small in size and light in weight, which meets the development needs of microwave vacuum electronic devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] For a more complete understanding of the present disclosure and its advantages, reference will now be made to the following description taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 A cross-sectional view schematically shows a tuning device according to an embodiment of the present disclosure;

[0022] Figure 2 A perspective view schematically shows a slider adjustment assembly according to an embodiment of the present disclosure;

[0023] Figure 3 A cross-sectional view schematically shows a slider adjustment assembly according to an embodiment of the present disclosure;

[0024] Figure 4 The flowchart of the tuning method of the tuning device according to the embodiment of the present disclosure is schematically shown. DETAILED DESCRIPTION

[0025] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0026] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0027] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0028] An embodiment of the present disclosure provides a tuning device, which is used for a terahertz trapezoidal expansion action cavity, comprising: a tuning fixing frame, which is arranged on the cavity; a tuning component, which is arranged on the tuning fixing frame, comprising: a tuning piston located in the cavity, a tuning piston rod penetrating the tuning fixing frame, a tuning slider and a tuning screw located in the tuning fixing frame; one end of the tuning piston rod is connected to the tuning piston, and the other end thereof is connected to the tuning slider, and the tuning screw is connected to the tuning slider, wherein the tuning screw is rotated under the action of an external force to push the tuning slider, so as to drive the tuning piston rod and the tuning piston to move, so as to adjust the working frequency of the cavity.

[0029] The present disclosure provides a tuning device, which has the characteristics of simple structure and easy operation, and has a structural locking function. The tuning size is stably controlled, and the traditional tuning technology is free from the dependence on bellows, avoiding the welding difficulty and risk brought by the composite diaphragm, and meeting the tuning requirements of a small-sized terahertz trapezoidal expansion cavity.

[0030] The technical solution of the present disclosure will be described in detail below in conjunction with the structure of the tuning device in the specific embodiment of the present disclosure. It should be understood that Figures 1-2 The structure of the tuning device shown in the figure is only exemplary to help those skilled in the art understand the technical solution of the present disclosure, and is not intended to limit the protection scope of the present disclosure.

[0031] Figure 1 A cross-sectional view of a tuning device according to an embodiment of the present disclosure is schematically shown. Figure 1 As shown, the tuning device comprises:

[0032] The tuning fixing frame 3 is arranged on the cavity 1 .

[0033] A tuning assembly is arranged on a tuning fixing frame 3, and includes: a tuning piston 4 located in a cavity 1, a tuning piston rod 6 penetrating the tuning fixing frame 3, a tuning slider 7 and a tuning screw 5 located in the tuning fixing frame 3; one end of the tuning piston rod 6 is connected to the tuning piston 4, and the other end thereof is connected to the tuning slider 7, and the tuning screw 5 is connected to the tuning slider 7, wherein the tuning screw 5 is rotated under the action of an external force to push the tuning slider 7, so as to drive the tuning piston rod 6 and the tuning piston 4 to move, thereby adjusting the working frequency of the cavity 1.

[0034] In the embodiment of the present disclosure, the cavity 1 can be a terahertz trapezoidal expansion action cavity, whose external shape is a rectangular cavity structure, and the cavity mainly adopts an inductive tuning method. Among them, the tuning piston 4 is arranged in the expansion action cavity, forming a cavity wall of the cavity. By using the tuning piston rod 6 to drive the tuning piston 4 to move, the internal volume of the cavity 1 is changed, and then the inductance of the cavity 1 is changed, so as to achieve the purpose of tuning the resonant frequency of the cavity. At the same time, the material properties of the tuning piston 4 are changed, and the loaded quality factor is adjusted, so that the working frequency and the loaded quality factor of the terahertz trapezoidal expansion action cavity can be adjusted.

[0035] Specifically, as a cavity wall of the resonant cavity, the tuning piston 4 needs to have good electrical and thermal conductivity. It can be made of oxygen-free copper material or monel and other materials with greater ohmic impedance characteristics, which is specifically designed according to the loaded quality factor of the cavity 1. Among them, when the tuning piston 4 is made of oxygen-free copper material, it can provide a high loaded quality factor of the cavity 1; when the tuning piston 4 is made of monel material, it can reduce the loaded quality factor of the cavity 1, that is, it plays a role in adjusting the loaded quality factor. In addition, by changing the material properties of the tuning piston 4, the gain inside the cavity can be increased and the bandwidth can be widened.

[0036] Furthermore, when the tuning piston 4 moves to the preset position, the locking screw 9 is rotated to lock and fix the tuning assembly so that the position is locked, so that the tuning size of the cavity 1 is stably controlled.

[0037] In the embodiment of the present disclosure, the tuning screw 5 and the locking screw 9 are respectively connected to the outer surface of the tuning slider 7 and the inside of the tuning fixing frame 3 through internal threads and external threads to achieve adjustable position of the tuning slider 7, thereby achieving position movement of the tuning piston rod 6 and the tuning piston 4.

[0038] In the embodiment of the present disclosure, the tuning bracket 3 is fixed on the cavity 1 by a plurality of fixing screws 2. To ensure the sealing between the tuning bracket 3 and the cavity 1, the tuning bracket 3 and the cavity 1 are sealed and connected by a stamping sheet 8. Figure 1As shown. The stamping sheet 8 can be deformed and stretched so that the tuning piston rod 6 can be adjusted slightly in the axial direction under the action of external force. Specifically, the thickness of the stamping sheet 8 ranges from 0.1 mm to 0.2 mm, preferably 0.15 mm. The inner hole of the stamping sheet 8 is welded to the middle of the tuning piston rod 6 by high temperature, and its outer edge is welded to the surface of the cavity 1 by high temperature, and the welding width is not less than 1 mm. By using the stamping sheet 8 as a sealing sheet, the cavity 1 is freed from the dependence on small-sized bellows, and the welding difficulty and risk brought by the composite diaphragm are avoided.

[0039] Specifically, the stamping sheet 8, the tuning piston rod 6 and the tuning slider 7 are preferably made of nickel-copper alloy (Ni-Cu alloy) material, the tuning fixing frame 3 can be made of brass material or non-magnetic stainless steel material, and the tuning bolts and fixing bolts are made of stainless steel material.

[0040] According to an embodiment of the present disclosure, the distance moved by the tuning piston 4 is proportional to the number of turns of the tuning screw 5 under the action of an external force, that is, as the number of turns of the tuning screw 5 increases, the distance moved by the tuning piston 4 into the cavity 1 is greater. Preferably, the pitch of the tuning screw 5 is 0.35 mm or 0.2 mm. For example, when the tuning screw 5 rotates 30°, the corresponding tuning piston 4 advances a distance ds, ds=0.35mm×30° / 360°=0.029mm. Therefore, according to the required operating frequency of the cavity 1, the corresponding number of turns of the tuning screw 5 can be rotated to move the tuning piston 4 to the preset position to achieve the required operating frequency of the cavity 1. When the tuning piston 4 is adjusted to the preset position, the locking screw 9 is rotated to lock and fix the tuning assembly.

[0041] Specifically, the tuning slider 7 is pushed along with the rotation of the tuning screw 5, driving the tuning piston rod 6 and the tuning piston 4 to move, thereby achieving the adjustment of the size of the cavity 1. Figure 2 and 3 As shown, the tuning assembly mainly includes: a fixing screw 2, a tuning piston 4, a tuning screw 5, a tuning piston rod 6, a tuning slider 7 and a locking screw 9. The tuning piston rod 6 is disposed inside the tuning slider 7, and the tuning piston rod 6 and the tuning slider 7 can be fixedly connected by the fixing screw 2. The shape of the tuning slider 7 can be cylindrical, and the position of the tuning slider 7 relative to the tuning fixed frame 3 can be moved by rotating the tuning screw 5 under the action of an external force. The adjustment transmission sequence of the tuning assembly is specifically: tuning screw 5-tuning slider 7-tuning piston rod 6-tuning piston 4-locking screw 9.

[0042] like Figure 3 As shown, the positions of the tuning screw 5 and the locking screw 9 can be arranged relative to each other to maintain the symmetry of the entire tuning assembly.

[0043] The tuning device provided by the present disclosure uses a stamping sheet 8 to seal the cavity 1 and the tuning fixture 3, eliminating the need for the development of a large number of small-sized bellows. The external tuning mechanism has a simple structure, thereby achieving a compact tuning assembly.

[0044] It should be noted that the various components provided in the embodiments of the present disclosure (such as the stamping sheet 8, the tuning screw 5, etc.) are not limited to those shown in the above embodiments, and the above numerical values ​​are only exemplary descriptions. In other practical application scenarios, they can be replaced by other numerical ranges, for example, the pitch of the tuning screw 5 can also be 0.16 mm, etc.

[0045] Figure 4 The flowchart of the tuning method of the tuning device according to the embodiment of the present disclosure is schematically shown.

[0046] like Figure 4 As shown, the tuning method includes:

[0047] S1, installing the tuning device on the cavity 1 to be tuned.

[0048] S2, rotating the tuning screw 5 to push the tuning slider 7, so as to drive the tuning piston rod 6 and the tuning piston 4 to move, so as to adjust the working frequency of the cavity 1.

[0049] S3, after the tuning piston 4 moves to the preset position, the locking screw 9 is rotated to lock the position of the tuning assembly.

[0050] In this embodiment, the tuning device used in the tuning method is as shown in the above embodiment, and its specific structure and parameters are as shown in the above embodiment, which will not be described in detail here.

[0051] In another exemplary embodiment of the present disclosure, a terahertz trapezoidal expansion cavity is provided, comprising: a tuning device as mentioned in the present disclosure.

[0052] In the embodiments of the present disclosure, Figure 1 As shown, the terahertz trapezoidal expansion cavity composed of the cavity 1, the tuning fixture 3 and the tuning assembly is a vertically symmetrical structure to ensure the symmetry of the entire device and good performance of the cavity.

[0053] Compared with the prior art, the present invention has at least the following beneficial effects:

[0054] 1) Compared with the external tuning mechanism of the traditional tuning mechanism, the tuning device provided by the present disclosure has a simple structure. The tuning device sets a tuning slider in the tuning fixing frame, uses a tuning screw to adjust the position of the tuning slider, and uses a locking screw to make the device have a position locking function. The tuning device is not only simple in structure and reliable in performance, but also saves the development of small-sized springs.

[0055] 2) The tuning device uses a tuning piston rod and a stamping sheet. When the tuning slider moves, it drives the tuning piston rod and the tuning piston to move, realizing the change of the cavity frequency. When the tuning piston rod moves, the stamping sheet can produce a certain deformation, which can ensure the sealing of the device, avoid the welding difficulty and risk brought by the composite diaphragm, and get rid of the development dependence on small-sized bellows.

[0056] 3) The tuning device is small in size and light in weight. For example, the mass of the device in the W-band extension device is less than 0.05 kg, which only increases the lateral width of the klystron by 16 mm. The current microwave vacuum electronic devices are developing in the direction of high frequency and compactness. The device is small in size and light in weight, which meets the development needs of microwave vacuum electronic devices.

[0057] Although the present disclosure has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive, as Figure 1 to Figure 4 The figure is a schematic diagram of the structure of a tuning device according to an embodiment of the present disclosure. In actual application, some components in the tuning device may be replaced by other components with the same or similar functions, or the structure of the device may be simplified or complicated. This embodiment does not constitute a limitation on the tuning device.

[0058] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of scopes, even if such combinations or combinations are not explicitly described in the present disclosure. In particular, the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of scopes without departing from the spirit and teachings of the present disclosure. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0059] Although the present disclosure has been shown and described with reference to specific exemplary embodiments of the present disclosure, it should be understood by those skilled in the art that various changes in form and details may be made to the present disclosure without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. Therefore, the scope of the present disclosure should not be limited to the above-mentioned embodiments, but should be determined not only by the appended claims, but also by the equivalents of the appended claims.

Claims

1. A tuning device, characterized in that: The tuning device is used for a terahertz trapezoidal expansion cavity, comprising: A tuning fixing frame (3) is arranged on the cavity (1); A tuning component is arranged on the tuning fixing frame (3), comprising: a tuning piston (4) located in the cavity (1), a tuning piston rod (6) penetrating the tuning fixing frame (3), a tuning slider (7) and a tuning screw (5) located in the tuning fixing frame (3); one end of the tuning piston rod (6) is connected to the tuning piston (4), and the other end is connected to the tuning slider (7); the tuning screw (5) is connected to the tuning slider (7), wherein the tuning screw (5) is rotated under the action of an external force to push the tuning slider (7), thereby driving the tuning piston rod (6) and the tuning piston (4) to move, thereby adjusting the working frequency of the cavity (1); The tuning fixing frame (3) and the cavity (1) are sealed and connected by a stamping sheet (8); the stamping sheet (8) and the tuning piston rod (6) are both made of a nickel-copper alloy material; the thickness of the stamping sheet (8) is 0.1 mm to 0.2 mm.

2. The tuning device according to claim 1, characterized in that The tuning device also includes: A locking screw (9) is arranged opposite to the tuning screw (5) and is used to lock the position of the tuning assembly after the tuning piston (4) moves to a preset position.

3. The tuning device according to claim 1, characterized in that: The tuning piston (4) is made of oxygen-free copper material or monel material.

4. The tuning device according to claim 1, characterized in that: The distance moved by the tuning piston (4) is proportional to the number of turns by which the tuning screw (5) is rotated under the action of an external force.

5. The tuning device according to claim 1, characterized in that: The tuning fixing frame (3) is made of brass material or non-magnetic stainless steel material.

6. A tuning method based on the tuning device according to any one of claims 1 to 5, characterized in that: include: Installing the tuning device on the cavity to be tuned; Rotating the tuning screw (5) to push the tuning slider (7) to drive the tuning piston rod (6) and the tuning piston (4) to move, thereby adjusting the operating frequency of the cavity (1); After the tuning piston (4) moves to the preset position, the locking screw (9) is rotated to lock the position of the tuning component.

7. A terahertz trapezoidal expansion cavity, characterized in that: include: A tuning device as claimed in any one of claims 1 to 5.

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