CN112909449B

CN112909449B - Collimating elbow

Info

Publication number: CN112909449B
Application number: CN201911137134.7A
Authority: CN
Inventors: 宋绍栋; 马放; 刘敏胜
Original assignee: ENN Science and Technology Development Co Ltd
Current assignee: ENN Science and Technology Development Co Ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2022-02-11
Anticipated expiration: 2039-11-19
Also published as: CN112909449A

Abstract

The invention discloses a quasi-optical elbow, relates to the technical field of electron cyclotron resonance heating, and solves the problems that a single elbow cannot change the microwave transmission direction in a step shape, and the directionality is poor and the microwave loss is large when the microwave transmission direction is changed. The quasi-optical elbow comprises a shell, and a microwave inlet and a microwave outlet are arranged on the shell; two concave reflectors which are parallel to each other and are oppositely arranged are arranged in the shell, the two concave reflectors comprise a first concave reflector and a second concave reflector, the center of the concave mirror of the first concave reflector is opposite to the microwave inlet, and the center of the concave mirror of the second concave reflector is opposite to the microwave outlet; an included angle between the axis of the microwave inlet and the plane where the first concave reflecting mirror is located is alpha, and an included angle between a connecting line between the center of the concave mirror of the first concave reflecting mirror and the center of the concave mirror of the second concave reflecting mirror and the plane where the first concave reflecting mirror is located is beta; 0 DEG < alpha < 90 DEG, and alpha-beta. The invention is used for changing the transmission direction of the microwave.

Description

Collimating elbow

Technical Field

The invention relates to the technical field of electron cyclotron resonance heating, in particular to a quasi-optical elbow.

Background

The electron cyclotron resonance heating system generally comprises a microwave source system, a microwave transmission system, a transmitting antenna system and the like. The microwave transmission system mainly functions to efficiently transmit microwaves generated by a microwave source system to a transmitting antenna system. In order to reduce the loss of the microwave in the transmission process, a corrugated waveguide is usually used for transmitting the microwave, and the transmission direction of the microwave is often changed by using an elbow in the transmission process due to the installation requirement of equipment.

The elbow in the prior art comprises a shell, wherein a metal plane mirror for changing the microwave transmission direction is arranged in the shell, the internal structure of the shell is compact, and the space is small. On one hand, when the existing elbow is used, the transmission direction of the microwave can only be changed by 90 degrees, and when the transmission path of the microwave needs to be adjusted in a step shape (the microwave is transmitted along a Z shape, the transmission directions of the microwave before and after adjustment are parallel to each other, but are not on the same straight line), the purpose can be achieved only by matching two elbows. However, when the two bends are matched, the requirement on the mounting accuracy of the two bends is high in order that the microwave reflected by the first bend can be accurately incident on the concave mirror of the other bend. On the other hand, when the existing elbow uses the plane mirror to change the microwave transmission direction, the microwave directionality is poor, part of the microwave can be emitted to the inner wall of the elbow, the loss of the microwave in the process of passing through the elbow is large, and the microwave transmission efficiency of the microwave transmission system is low.

Disclosure of Invention

The quasi-optical elbow provided by the embodiment of the invention solves the problems that a single elbow cannot change the microwave transmission direction in a step-like manner, and the directionality and the microwave loss are high when the microwave transmission direction is changed.

In order to achieve the above object, an embodiment of the present invention provides a quasi-optical elbow, which includes a housing, wherein the housing is provided with a microwave inlet and a microwave outlet, and the microwave inlet and the microwave outlet are respectively located on two opposite sidewalls of the housing; two concave reflectors are arranged in the shell, the two concave reflectors are parallel to each other and are oppositely arranged, the two concave reflectors comprise a first concave reflector and a second concave reflector, the center of the concave reflector of the first concave reflector is opposite to the microwave inlet, and the center of the concave reflector of the second concave reflector is opposite to the microwave outlet; an included angle between the axis of the microwave inlet and the plane where the first concave reflecting mirror is located is alpha, and an included angle between a connecting line between the center of the concave mirror of the first concave reflecting mirror and the center of the concave mirror of the second concave reflecting mirror and the plane where the first concave reflecting mirror is located is beta; wherein 0 ° < α < 90 °, and α ═ β.

The quasi-optical elbow provided by the embodiment of the invention comprises a shell, wherein two opposite side walls of the shell are respectively provided with a microwave inlet and a microwave outlet, the microwave inlet is communicated with a microwave wave source, and the microwave outlet is communicated with a microwave transmitting antenna. Two concave reflectors are arranged in the shell and comprise a first concave reflector and a second concave reflector. The center of the concave mirror of the first concave reflecting mirror is disposed opposite to the microwave inlet so that the microwave injected from the microwave inlet can be incident on the center of the concave mirror of the first concave reflecting mirror. First concave surface speculum and second concave surface speculum are parallel to each other and relative setting, and wherein, first concave surface speculum and second concave surface speculum relative setting refer to: the concave mirrors of the two concave mirrors are oppositely arranged, so that the microwave reflected by the concave mirror of the first concave mirror can be emitted to the concave mirror of the second concave mirror, and the transmission direction after the microwave is reflected by the second concave mirror is parallel to the transmission direction of the microwave when the microwave is injected into the shell. The center of the concave mirror of the second concave reflecting mirror is opposite to the microwave outlet, so that the microwave reflected by the second concave reflecting mirror can be emitted from the microwave outlet. After the quasi-optical elbow is reflected by the first concave reflector and the second concave reflector, the microwave is still transmitted along the original direction, so that the purpose of changing the microwave transmission path in a stepped manner is achieved. The included angle between the axis of the microwave inlet and the plane where the first concave reflecting mirror is located is alpha, and the included angle between the connecting line between the center of the concave mirror of the first concave reflecting mirror and the center of the concave mirror of the second concave reflecting mirror and the plane where the first concave reflecting mirror is located is beta. Wherein, alpha is more than 0 degree and less than 90 degrees, which can lead the transmission direction of the microwave to form a certain included angle with the transmission direction of the microwave injected into the shell after the microwave injected from the microwave inlet is reflected by the first concave reflector. The microwave reflected by the concave mirror center of the first concave mirror can be accurately transmitted to the concave mirror center of the second concave mirror. On one hand, in the prior art, the transmission direction of the microwave can be adjusted in a step shape only by matching two elbows; in the embodiment of the invention, two parallel concave reflectors are arranged in the quasi-optical elbow, the transmission direction of the microwave can be adjusted in a stepped manner by only one quasi-optical elbow, and the quasi-optical elbow has a simple structure and is convenient to install. On the other hand, in the prior art, the method of changing the microwave transmission direction by adopting a plane mirror has poor microwave directionality; in the embodiment of the invention, the concave mirror is adopted to change the transmission direction of the microwave, and the concave mirror of the concave mirror can play a role in converging and focusing the microwave, so that the directionality of the microwave is improved, the loss of the microwave when the microwave passes through the quasi-optical elbow is reduced, and the microwave transmission efficiency of a microwave transmission system is improved.

Drawings

Fig. 1 is a schematic perspective view of a quasi-optical elbow according to an embodiment of the present invention;

FIG. 2 is a top view of a housing body of an embodiment of the present invention;

FIG. 3 is a schematic diagram of the path of microwaves traveling in a quasi-optical bend according to an embodiment of the present invention;

FIG. 4 is a schematic perspective view of a concave reflector according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view of a concave reflector according to an embodiment of the present invention;

FIG. 6 is a schematic view of an assembly structure of a concave reflector according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a supporting frame according to an embodiment of the present invention;

FIG. 8 is an exploded view of a fine tuning screw pair and mounting block in accordance with an embodiment of the present invention;

fig. 9 is a schematic perspective view of a housing body according to an embodiment of the invention;

FIG. 10 is a schematic structural diagram of a water cooling apparatus according to an embodiment of the present invention;

fig. 11 is a schematic diagram of a microwave transmission tube used in conjunction with a quasi-optical bend.

Reference numerals

1-a shell; 1 a-a housing body; 1 b-a cover plate; 11-microwave inlet; 12-microwave outlet; 13-mounting flange; 14-installing a rib plate; 2-a concave mirror; 2 a-a first concave mirror; 2 b-a second concave mirror; 21-a concave mirror; 22-back side; 23-sidewalls of concave mirrors; 3-fine adjustment of a thread pair; 31-a first trimming thread pair; 311-screw rod; 312-a nut; 32-a second fine tuning thread pair; 33-a third fine tuning thread pair; 4-a support frame; 41-a fixed part; 42-a mounting portion; 421-a through hole; 5-a fixed structure; 51-a first side wall; 52-a second side wall; 521-a sub-sidewall; 53-fixed block; 531-side plate; 54-a screw; 6-cushion block; 7-a water cooling device; 71-a cooling tube; 72-wire spool; 73-a fixed support; 8-microwave transmission tube; 81-flange.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present invention, with reference to fig. 4 and 5, the "concave mirror 21 of the concave reflecting mirror 2" means: the concave reflecting mirror 2 is provided with a side wall for reflecting the microwave; "center of concave mirror 21 of concave mirror 2" means: the lowest concave point of the concave mirror 21 of the concave reflecting mirror 2; the "back surface 22 of the concave mirror 2" means: a side wall opposite to the concave mirror 21 of the concave reflecting mirror 2; "side wall 23 of the concave mirror" means: the sum of all the side walls of the concave mirror 21 and the back surface 22 perpendicular to the concave mirror 2.

The embodiment of the invention provides a quasi-optical elbow, as shown in fig. 1 and fig. 2, the quasi-optical elbow comprises a shell 1, a microwave inlet 11 and a microwave outlet 12 are arranged on the shell 1, and the microwave inlet 11 and the microwave outlet 12 are respectively positioned on two opposite side walls of the shell 1; be equipped with two concave reflecting mirrors 2 in the casing 1, two concave reflecting mirrors 2 are parallel to each other and set up relatively, and two concave reflecting mirrors 2 include first concave reflecting mirror 2a and second concave reflecting mirror 2b, and the concave mirror 21 center of first concave reflecting mirror 2a sets up with microwave inlet 11 relatively, and the concave mirror 21 center of second concave reflecting mirror 2b sets up with microwave outlet 12 relatively. As shown in fig. 3, an included angle between the axis of the microwave inlet 11 and the plane where the first concave mirror 2 is located is α, and an included angle between a connecting line between the center of the concave mirror 21 of the first concave mirror 2a and the center of the concave mirror 21 of the second concave mirror 2 and the plane where the first concave mirror 2a is located is β; wherein 0 ° < α < 90 °, and α ═ β.

The quasi-optical elbow provided by the embodiment of the invention, as shown in fig. 1 and fig. 2, comprises a shell 1, wherein two opposite side walls of the shell 1 are respectively provided with a microwave inlet 11 and a microwave outlet 12, the microwave inlet 11 is communicated with a microwave wave source, and the microwave outlet 12 is communicated with a microwave transmitting antenna. Two concave reflectors 2 are arranged in the housing 1, and the two concave reflectors 2 include a first concave reflector 2a and a second concave reflector 2 b. The center of the concave mirror 21 of the first concave reflecting mirror 2 is disposed opposite to the microwave inlet 11 so that the microwaves injected from the microwave inlet 11 can impinge on the concave mirror 21 of the first concave reflecting mirror 2 a; first concave reflecting mirror 2a and second concave reflecting mirror 2b are parallel to each other and set up relatively, and wherein, first concave reflecting mirror 2a and second concave reflecting mirror 2b set up relatively means: the concave mirrors 21 of the two concave mirrors 2 are oppositely arranged, so that the microwave reflected by the concave mirror 21 of the first concave mirror 2a can be incident on the concave mirror 21 of the second concave mirror 2b, and the transmission direction after being reflected by the concave mirror 21 of the second concave mirror 2b is parallel to the transmission direction of the microwave when being injected into the housing 1. The center of the concave mirror 21 of the second concave reflecting mirror 2b is disposed opposite to the microwave outlet 12 so that the microwave reflected by the second concave reflecting mirror 2b can be emitted from the microwave outlet 12. After the quasi-optical elbow is reflected by the first concave reflector and the second concave reflector, the microwave is still transmitted along the original direction, so that the purpose of changing the microwave transmission path in a stepped manner is achieved. Referring to fig. 3, an angle between an axis of the microwave inlet 11 and a plane where the first concave mirror 2a is located is α, and an angle between a line connecting a center 21 of the concave mirror of the first concave mirror 2a and a center of the second concave mirror 2b and the plane where the first concave mirror 2a is located is β. Wherein, alpha is more than 0 degree and less than 90 degrees, which can lead the transmission direction of the microwave to form a certain included angle with the direction of the microwave injected into the shell 1 after the microwave injected from the microwave inlet 11 is reflected by the first concave reflector 2 a. α ═ β, the microwave reflected by the concave mirror 21 of the first concave mirror 2a can be transmitted accurately to the center of the concave mirror 21 of the second concave mirror 2 b. On one hand, the transmission direction of the microwave can be adjusted in a step shape only by matching two elbows in the prior art; in the embodiment of the invention, two parallel concave reflectors 2 are arranged in the quasi-optical elbow, the transmission direction of the microwave can be adjusted in a stepped manner by only one quasi-optical elbow, and the quasi-optical elbow has simple structure and convenient installation. On the other hand, compared with the prior art, the method of changing the microwave transmission direction by adopting the plane mirror is adopted. In the embodiment of the invention, the concave mirror 2 is adopted to change the transmission direction of the microwave, and the concave mirror 21 of the concave mirror 2 can play a role in converging and focusing the microwave, so that the directionality of the microwave is improved, the microwave loss when the microwave passes through the quasi-optical elbow is reduced, and the microwave transmission efficiency of a microwave transmission system is improved.

Referring to fig. 4 and 5, the center of the concave mirror 21 of the concave mirror 2 is: the lowest point of the concave surface of the concave mirror 21 of the concave mirror 2. Referring to fig. 3, "the axis of the microwave inlet" refers to a straight line perpendicular to the side wall of the microwave inlet 11 and passing through the center of the microwave inlet 11, and the axis is parallel to the direction of the microwave when it is injected into the quasi-optical bend. The arrangement of the center of the concave mirror 21 of the concave reflecting mirror 2 opposite to the microwave inlet 11 or the microwave outlet 12 means that: the concave mirror 21 of the concave mirror 2 is disposed towards the microwave inlet 11 or the microwave outlet 12, and the center of the concave mirror 21 is opposite to the center of the microwave inlet 11 or the microwave outlet 12, however, the concave mirror 21 of the concave mirror 2 may have a certain included angle with the plane where the microwave inlet 11 or the microwave outlet 12 is located.

In order to further improve the directionality of the microwave reflected by the concave reflector 2, the concave surface of the concave reflector 2 is an equiphase surface of the microwave, wherein the equiphase surface can be calculated according to an optical propagation principle. When the quasi-optical elbow transmits microwaves with different frequencies, the concave reflecting mirrors 2 with different concave surfaces are adopted.

In the quasi-optical bend according to the embodiment of the present invention, as shown in fig. 3, an angle between an axis of the microwave inlet 11 and a plane of the first concave mirror 2a is 45 °, that is, α ═ β ═ 45 °. The microwave generates a stray mode in the process of transmitting in vacuum, and as the transmission path of the microwave increases, not only the loss of the microwave increases, but also the directionality of the microwave deteriorates. When α ═ β ═ 45 °, microwaves are injected from the microwave inlet 11 and strike the center of the concave mirror 21 of the first concave mirror 2a, the microwaves are reflected by the first concave mirror 2a, the transmission direction of the microwaves changes by 90 °, the microwaves strike the center of the concave mirror 21 of the second concave mirror 2b in a direction perpendicular to the direction in which the microwaves are injected into the collimating lens bend, the microwaves are reflected by the second concave mirror 2b, the transmission direction of the microwaves changes by 90 ° again, and the microwaves are emitted from the microwave outlet 12. When alpha is 45 degrees, the transmission path of the microwave in the quasi-optical elbow can be shortest, so that the loss of the microwave passing through the quasi-optical elbow is reduced, the directivity of microwave transmission is improved, and the transmission efficiency of the microwave is improved.

In the embodiment of the invention, the concave reflector 2 is movably connected with the shell 1 through the fine adjustment thread pair 3, so that the concave reflector 2 can freely move in the shell 1. Referring to fig. 1, 6 and 7, each side wall of the concave reflector 2 is movably connected with the housing 1 through the fine adjustment thread pair 3, the concave reflector 2 is only contacted with the fine adjustment thread pair 3 and is not contacted with the housing 1, and the position of the concave reflector 2 can be adjusted by adjusting the fine adjustment thread pair 3. The position of the concave reflector 2 in the shell 1 can be adjusted, which is convenient for adjusting the concave reflector 2 to the position corresponding to the microwave inlet 11 or the microwave outlet 12, and can also finely adjust the included angle alpha between the axis of the microwave inlet 11 and the axis of the microwave outlet 12 and the plane where the concave reflector 2 is located, and the included angle beta between the connecting line of the centers of the two concave reflectors 2 and the plane where the concave reflectors 2 are located. Therefore, the fine tuning screw pair 3 can increase the accuracy of the transmission direction of the microwave reflected by the concave reflector 2, and further increase the directionality of the microwave.

It should be noted that, during the assembly of the quasi-optical elbow, the concave reflector 2 is fixed at a desired position, the fine adjustment screw pair 3 mainly achieves the purpose of fine adjustment, and when the position of the concave reflector 2 is adjusted by the fine adjustment screw pair 3, the position of the concave reflector 2 is generally moved within a small range.

In order to make concave reflector 2 can remove along all directions in casing 1, need set up fine setting screw thread pair 3 at each lateral wall of concave reflector 2, support with concave reflector 2 and lean on through casing 1 if directly with fine setting screw thread pair 3, not only can influence casing 1's leakproofness, inconvenient concave reflector 2's location and fixed moreover. Therefore, the collimating optical bend according to the embodiment of the present invention, as shown in fig. 6, 7 and 8, further includes a supporting frame 4 and a fixing structure 5 in the housing 1. The support 4 is arranged opposite the rear face 22 of the concave reflector 2. The fixed structure 5 includes a first side wall 51 disposed opposite the concave mirror 21 of the concave mirror 2, and a second side wall 52 disposed along the circumferential direction of the concave mirror 2 and perpendicular to the concave mirror 2. The concave reflector 2 is located between the support frame 4 and the first sidewall 51, and the concave reflector 2 is located in the middle of the second sidewall 52.

Referring to fig. 6 and 7, the fine adjustment screw thread pair 3 includes: a first fine-tuning screw pair 31 which passes through the support frame 4 and abuts against the back surface 22 of the concave reflector 2, a second fine-tuning screw pair 32 which passes through the first side wall 51 and abuts against the concave mirror 21 of the concave reflector 2, and a third fine-tuning screw pair 33 which passes through the second side wall 52 and abuts against the side wall 23 of the concave reflector. The first fine tuning screw pair 31 and the second fine tuning screw pair 32 are matched to control the movement of the concave reflector 2 along the direction vertical to the concave reflector 2, and the third fine tuning screw pair 33 controls the movement of the concave reflector 2 along the direction parallel to the concave reflector 2. So that the concave reflector 2 can move freely in the shell 1 under the control of the fine adjustment screw pair 3.

It should be noted that, in order to make the concave reflector 2 move in a straight line direction, at least two opposite fine adjustment screw thread pairs 3 are required to be included along the straight line direction, the concave reflector 2 is clamped by the two opposite fine adjustment screw thread pairs 3 from two opposite sides, and the two opposite fine adjustment screw thread pairs 3 cooperate together to control the movement of the concave reflector 2 along the straight line direction. In general, as shown in fig. 4 and 5, the main body of the concave mirror 2 is a hexahedron, and the number of the side walls 23 of the concave mirror is four. Therefore, as shown in fig. 6, the second sidewall 52 of the fixing structure 5 includes a plurality of sub-sidewalls 521 corresponding to the sidewalls 23 of the concave reflector one to one, and at least one third fine tuning screw pair 33 is disposed on a side of each sub-sidewall 521 away from the concave reflector 2, and the third fine tuning screw pair 33 abuts against the sidewalls 23 of the concave reflector through the sub-sidewalls 521. The position of the first sidewall 51 of the fixing structure 5 corresponding to the concave surface of the concave reflecting mirror 2 is a microwave avoiding opening, so that the microwave injected into the collimating optical bend can be incident on the concave surface of the concave mirror 21 of the concave reflecting mirror 2.

In the embodiment of the present invention, as shown in fig. 6 and 7, the number of the first fine adjustment screw pair 31, the second fine adjustment screw pair 32, and the third fine adjustment screw pair 33 is plural. The first fine tuning thread pairs 31 are uniformly arranged on the support frame 4 along the circumferential direction of the concave reflector 2; a plurality of second fine adjustment thread pairs 32 are uniformly arranged on the first side wall 51 of the fixed structure 5 along the circumferential direction of the concave reflector 2; a plurality of third fine adjustment screw pairs 33 are arranged uniformly along the circumferential direction of the concave reflecting mirror 2 on the second side wall 52 of the fixing structure 5. The arrangement mode can more reliably fix the concave reflector 2 in the shell 1 and can also enable the position of the concave reflector 2 to be adjusted more flexibly and more variously.

Referring to fig. 8, the fine adjustment screw pair 3 includes a screw 311 and a nut 312, the nut 312 is fixedly connected to the fixing structure 5 or the supporting frame 4, the screw 312 passes through the nut 312 and abuts against the concave reflector 2, and by rotating the screw 311, the position of the concave reflector 2 relative to the supporting frame 4 and the fixing structure 5 can be adjusted, so as to adjust the position of the concave reflector 2 in the housing 1. Wherein the fixing structure 5 is fixed on the support frame 4 by screws 54.

In order to facilitate the connection and fixation between the supporting frame 4 and the casing 1, in the embodiment of the invention, as shown in fig. 6 and 7, the supporting frame 4 includes a fixing portion 41 and a mounting portion 42 which are perpendicular to each other, the fixing portion 41 is connected and fixed with the casing 1, and the mounting portion 42 is parallel to the concave reflecting mirror 2. The fixing portion 41 and the mounting portion 42 may form an L-shaped structure or a T-shaped structure, in the embodiment of the present invention, the fixing portion 41 and the mounting portion 42 are distributed in an L-shaped manner, and the supporting frame 4 has a simple structure and is convenient to manufacture. Referring to fig. 7, in order to reduce the weight of the supporting frame 4 and save material, the mounting portion 42 may have a ring-shaped structure, and a through hole 421 may be formed in the middle of the mounting portion 42.

Referring to fig. 6 and 8, the fixing structure 5 of the quasi-optical elbow according to the embodiment of the present invention includes four fixing blocks 53, and the four fixing blocks 53 are respectively located at four corners of the concave reflecting mirror 2. Each fixed block 53 includes three side plates 531 perpendicular to each other, each side plate 531 being opposite to the side wall 23 of one concave reflecting mirror; each side plate 531 is provided with a fine adjustment thread pair 3, and the fine adjustment thread pair 3 passes through the side plate 531 to be abutted against the concave reflector 2; wherein, a second fine tuning screw pair 32 which passes through the side plate 531 and abuts against the concave mirror 21 of the concave reflecting mirror 2, and a third fine tuning screw pair 33 which passes through the side plate 531 and abuts against the side wall 23 of the concave reflecting mirror are included. Instead of making the fixing structure 5 into four fixing blocks 53, the fixing structure 5 may be made into a ring-shaped structure. However, compared with the fixing structure 5 made into a ring structure, in the embodiment of the present invention, the fixing structure 5 is divided into four fixing blocks 53, and the four fixing blocks 53 are movably connected to the four corners of the concave reflecting mirror 2, so that the material consumed by the fixing structure 5 can be saved, the manufacturing cost of the fixing structure 5 can be reduced, and the fixing structure 5 has a simpler structure and is convenient to manufacture.

Referring to fig. 1, 2 and 9, the housing 1 further includes a spacer 6, the spacer 6 is located between the supporting frame 4 and the housing 1, one end of the spacer 6 is fixedly connected to the housing 1, and the other end of the spacer 6 is fixedly connected to the fixing portion 41 of the supporting frame 4. In order to facilitate the post-maintenance, disassembly and replacement of the collimating optical elbow, the support frame 4 and the housing 1 need to be detachably connected. However, the quasi-optical elbow needs to be in a vacuum environment when in use, and the requirement on the sealing property of the shell 1 is high; and the housing 1 is generally made of sheet metal and has a small thickness. If the supporting frame 4 is directly connected and fixed to the housing 1, for example, when the supporting frame 4 is detachably mounted and fixed to the housing 1 by using screws, if the screws penetrate through the housing 1, the sealing performance of the housing 1 may be damaged, and if the screws do not penetrate through the housing 1, the supporting frame 4 and the housing 1 may be connected and fixed insecurely. Therefore, a cushion block 6 is arranged between the support frame 4 and the casing 1, optionally, one end of the cushion block 6 close to the casing 1 is welded and fixed to the casing 1, the other end of the cushion block 6 is provided with a threaded hole, a fixing hole is arranged at a position of the fixing portion 41 of the support frame 4 corresponding to the threaded hole, a screw penetrates through the fixing hole to be matched with the threaded hole, the support frame 4 is fixed on the cushion block 6, and then the support frame 4 and the casing 1 are kept relatively static.

As shown in fig. 10, the quasi-optical elbow according to the embodiment of the present invention further includes a water cooling device 7 in the housing 1, where the water cooling device 7 includes a cooling pipe 71, a wire spool 72, and a fixing bracket 73, the cooling pipe 71 is wound on the outer side of the wire spool 72, the cooling pipe 71 is flatly laid on the inner wall of the housing 1, the fixing bracket 73 is located on the side of the cooling pipe 71 opposite to the housing 1, and the fixing bracket 73 fixes the cooling pipe 71 and the wire spool 72 on the inner wall of the housing 1. The microwave can produce miscellaneous mode in the transmission process in the quasi-optical elbow, and the miscellaneous mode can deviate from the original transmission path and collide with the inner wall of the shell 1, so that the temperature of the inner wall of the shell 1 is increased. In the embodiment of the invention, because the water cooling device 7 is added, when the electron cyclotron resonance heating system works for a long time and with high power, cooling liquid (usually water) is circularly introduced into the cooling pipe 71, and because the water can well absorb the mixed mode generated by microwave, the water cooling device 7 can reduce the contact between the mixed mode and the inner wall of the shell 1 and reduce the generation of heat; meanwhile, heat in the shell 1 is taken away, the internal temperature of the shell 1 is reduced, and the phenomenon that the internal temperature of the quasi-optical elbow is too high and adverse effects are generated on an electron cyclotron resonance heating system is prevented.

The quasi-optical elbow is positioned in the microwave transmission system and used for changing the microwave transmission direction. The microwave inlet 11 is typically in communication with a microwave source via a microwave transmission tube 8 (optionally a corrugated waveguide) and the microwave outlet 12 is in communication with a microwave transmitting antenna via the microwave transmission tube 8. In order to facilitate the connection and fixation between the microwave transmission tube 8 and the microwave inlet 11 and between the microwave outlet 12, as shown in fig. 2, the quasi-optical elbow according to the embodiment of the present invention has mounting flanges 13 at both the microwave inlet 11 and the microwave outlet 12, and the mounting flanges 13 are used for connecting and fixing the microwave transmission tube 8. In order to improve the sealing performance at the mounting flange 13, the mounting flange 13 is a planar metal flange with a sealing groove.

It should be noted that, corresponding to the mounting flange 13, as shown in fig. 11, a flange 81 matched with the mounting flange 13 is disposed at one end of the microwave transmission tube 8 communicating with the quasi-optical elbow, and the flange 81 is sleeved on the outer side of the microwave transmission tube 8 and is connected and fixed with the mounting flange 13.

To facilitate the installation and fixation of the internal structural components of the collimating elbow housing 1, as shown in fig. 1, the housing 1 generally comprises a housing body 1a and a cover plate 1 b. Alternatively, referring to fig. 10, the water cooling device 7 is fixedly installed on the inner wall of the cover plate 1 b. Referring to fig. 2, a mounting rib plate 14 is provided on the housing body 1a and connected to the cover plate 1b, the mounting rib plate 14 detachably fixes the cover plate 1b to the housing body 1a, and a sealing structure is provided on the mounting rib plate 14, so that the housing body 1a and the cover plate 1b can be hermetically connected.

In the description herein, particular features, structures, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. The quasi-optical elbow is characterized by comprising a shell, wherein the shell is provided with a microwave inlet and a microwave outlet, and the microwave inlet and the microwave outlet are respectively positioned on two opposite side walls of the shell; two concave reflectors are arranged in the shell, the two concave reflectors are parallel to each other and are oppositely arranged, the two concave reflectors comprise a first concave reflector and a second concave reflector, the center of the concave reflector of the first concave reflector is opposite to the microwave inlet, and the center of the concave reflector of the second concave reflector is opposite to the microwave outlet; an included angle between the axis of the microwave inlet and the plane where the first concave reflecting mirror is located is alpha, and an included angle beta between a connecting line between the center of the concave mirror of the first concave reflecting mirror and the center of the concave mirror of the second concave reflecting mirror and the plane where the first concave reflecting mirror is located; wherein, alpha is more than 0 degree and less than 90 degrees; and α ═ β;

the concave reflector is movably connected with the shell through a fine adjustment thread pair, so that the concave reflector can freely move in the shell.

2. The quasi-optical elbow of claim 1 wherein the concave mirror of the concave reflecting mirror is a microwave equiphase surface.

3. A quasi-optical bend according to claim 1, wherein the axis of the microwave inlet is at an angle of 45 ° to the plane of the first concave mirror, i.e. α - β -45 °.

4. The quasi-optical elbow of claim 1 further comprising a support frame and a securing structure within the housing, the support frame being disposed opposite the back surface of the concave reflector; the fixing structure comprises a first side wall and a second side wall, the first side wall is opposite to the concave mirror of the concave reflecting mirror, the second side wall is perpendicular to the concave reflecting mirror, the concave reflecting mirror is located between the support frame and the first side wall, and the second side wall is arranged along the circumferential direction of the concave reflecting mirror;

the fine tuning thread pair comprises: the first fine tuning thread pair penetrates through the support frame and abuts against the back surface of the concave reflector; the second fine tuning thread pair penetrates through the first side wall and abuts against the concave mirror of the concave reflecting mirror; the third fine tuning thread pair penetrates through the second side wall and abuts against the side wall of the concave reflector; the first fine-tuning thread pair and the second fine-tuning thread pair are matched to control the movement of the concave reflector along the direction vertical to the concave reflector, and the third fine-tuning thread pair controls the movement of the concave reflector along the direction parallel to the concave reflector.

5. The quasi-optical elbow of claim 4, wherein the supporting frame comprises a fixing portion and a mounting portion perpendicular to each other, the fixing portion is connected and fixed with the housing, and the mounting portion is parallel to the concave reflector.

6. The quasi-optical elbow of claim 4 wherein the fixing structure comprises four fixing blocks, the four fixing blocks being respectively located at four corners of the concave reflecting mirror; each fixed block all includes three two liang of vertically curb plates, every the curb plate with a lateral wall of concave surface speculum is relative, and every all be equipped with at least one fine setting screw thread pair on the curb plate, fine setting screw thread pair passes the curb plate with the concave surface speculum supports and leans on.

7. The quasi-optical elbow according to claim 5, further comprising a spacer block in the housing, wherein the spacer block is located between the supporting frame and the housing, and one end of the spacer block is fixedly connected to the housing and the other end is fixedly connected to the fixing portion of the supporting frame.

8. The quasi-optical elbow according to claim 1, wherein a water cooling device is further disposed in the housing, the water cooling device comprises a cooling tube, a wire spool, and a fixing bracket, the cooling tube is wound around an outer side of the wire spool and is tiled on an inner wall of the housing, the fixing bracket is disposed on a side of the cooling tube opposite to the housing, and the fixing bracket fixes the cooling tube and the wire spool on the inner wall of the housing.

9. The quasi-optical elbow according to claim 1, wherein mounting flanges are provided at the microwave inlet and the microwave outlet, and the mounting flanges are used for being fixedly connected with a microwave transmission pipe.