JPS6230406A - Waveguide device - Google Patents

Abstract

PURPOSE:To easily fit a metal plate to any position of a waveguide in any stage of production and to attain efficient electric contact by constituting a metal plate iris with a master metal plate and slave metal plates. CONSTITUTION:The metal plate iris 11 is constituted of one master metal plate 13 and two slave metal plates 14 in the rectangular waveguide 12. Both the side end surfaces 13c of the plate 13 are gradually approached to each other in the downward direction like inclined surfaces to form the plate 13 like an upside-down trapezoid and its lower end part is fixed on the waveguide 12 through a screw member 16 penetrated into a hole 15 perforated into the waveguide 12. On the other hand, the plates 14 are formed like trapezoids constituted so that respective outside end surfaces 14a form vertical surfaces and respective inside end surfaces 14b form inclined surfaces corresponding to the surfaces 13a of the plate 13 and soldered sheets 17 are formed on the surfaces 14a. Consequently, the metal plate can be easily fitted to any position in any stage of production even if soldering to the position is difficult, and electric contact between the metal plates and the waveguide can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a waveguide device for transmitting microwaves, and more particularly to an improvement in a metal plate iris installed in a waveguide.

[Technical background of the invention and its problems]

In recent years, research has been carried out on nuclear fusion experimental equipment that uses the heating effect of microwaves to heat plasma with microwaves.
Injection into the plasma is important. For this reason, a metal plate iris has been conventionally used in microwave input waveguides to improve microwave matching.

Figures 5(a) and 5(b) show a microwave incidence deep wave tube device equipped with a vacuum window and an iris;
), on the left side of the vacuum window 1, the tip of the waveguide 2 matches the plasma and the inside of the waveguide 2 is kept in a vacuum, and on the right side, the end is connected to the microwave oscillator and The inside of the waveguide 2 is filled with a gas having high dielectric strength such as SF6 gas.

By the way, iris is, for example,
As shown in the publication, it is a window, and metal plate 3
This is the space formed by the waveguide 2 and the inner wall of the waveguide 2.

Here, the distance d between the metal plates 3, the thickness t of the metal plate 3, and the distance 1 between the vacuum window 1 and the metal plate 3 are the thickness of the vacuum window 1,
There is a close relationship with the inner wall dimensions a and b of the waveguide 2 and the frequency of the microwave used, and the distance d1, thickness t, and distance 1
The optimal value of is determined by calculation.

6 and 7 respectively show conventional methods for attaching this type of metal plate 3 to the waveguide 2. The one shown in FIG. The metal plate 3 is inserted into the waveguide through a slit 5 leading to the outside, and in the case shown in FIG. It is designed to be fixed to the inner wall.

However, the former method, which uses a plug-in method, has the problem that it is not easy to make good electrical contact between the inner wall of the waveguide 2 and the metal plate 3, and the latter method, which uses a brazing method, has a problem in terms of calculation. This poses a problem when it is necessary to attach the metal plate 3 to a position that is difficult to braze.

In addition, in reality, since there are individual variations in the inductivity of the vacuum window 1, it is often necessary to change the position when mounting the metal plate 3, but in the conventional mounting method 1 described above, either In this case, it is not easy to change the position of the metal plate 3 once it has been installed, so it is necessary to fine-tune the shape of the metal plate 3 by, for example, the method shown in the above-mentioned Japanese Utility Model Publication No. 56-45204. There is also the problem that it is not easy.

[Purpose of the invention]

The present invention was made in view of the current situation, and allows a metal plate to be easily attached to a waveguide at any location on the waveguide and at any stage of manufacturing, and furthermore, the metal plate and the waveguide can be easily attached to any part of the waveguide and at any stage of manufacturing. It is an object of the present invention to provide a waveguide device that can make good electrical contact with a pipe.

[Summary of the invention]

The present invention provides a metal plate iris with one end surface in contact with the other.
It is composed of two main metal plates and a required number of slave metal plates, and can be tightened by a screw member pushed through the main metal plate from outside the waveguide, and the main metal plate and the slave metal plate are The secondary metal plate is fixed as a contact surface that is inclined with respect to the direction in which the main metal plate is tightened, thereby making it easy to fix the metal plate to the waveguide, and making it possible to connect the waveguide and the metal plate easily. It is characterized by being able to make good electrical contact with the plate.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Note that the present invention has a feature only in the metal plate iris portion, and the other portions have the same structure as the conventional one, so only this feature will be illustrated and explained below.

1 and 2, 11 is a rectangular waveguide iris, and this metal plate iris 11 is connected to one main metal plate 13.
and two subordinate metal plates 14, making up a three-plate structure.

As shown in FIG. 1, the main metal plate 13 has an inverted trapezoid shape with inner end surfaces 13a, 13a gradually approaching the lower end in the figure, and a rectangular shape at the lower end. A shear screw member 1 passes through a hole 15 provided in a waveguide 12.
6 is screwed on, and is fixed to the rectangular waveguide 12 by tightening this screw member 16.

On the other hand, as shown in FIG.
It is formed into a trapezoidal shape with an inclined surface corresponding to the side end surface 13a of No. 3, and a sheet of solder 1 is placed on the outside end surface 14a.
7 is placed.

By tightening the main metal plate 13 with a screw member 16, each secondary metal plate 14 is connected to the both end surfaces 13a,
If it is pressed outward and downward by the wedge action of 14b and fixed inside the rectangular waveguide 12, it will be in close contact with the inner surface of the rectangular waveguide 12. Electrical contact can be made.

Next, the operation of this embodiment will be explained.

When installing the metal plate iris 11, first combine the main metal plate 13 and the secondary metal plate 14 in the state shown in FIGS. 1 and 2, and then insert the screw member from the outside of the rectangular waveguide 12 through the hole 15 16 is screwed onto the main metal plate 13. Then, tighten the screw member 16.

Then, the main metal plate 13 gradually approaches the inner surface of the rectangular waveguide 12 as the screw member 16 is tightened. When the main metal plate 13 approaches the inner surface of the rectangular waveguide 12, each of the subordinate metal plates 14, which are in contact with both side end faces 13a, 13a via the inner end face 14b, are moved outwardly and Pressed downward, both end surfaces 13a,
14b are in close contact with each other, and the outer end surface 14a and lower end surface of each slave metal plate 14 are in close contact with the inner surface of the rectangular waveguide 12. Therefore, the electrical contact between the two metal plates 13 and 14, the slave metal plate 14, and the rectangular waveguide 12 becomes good. In particular, since the solder 17 in the shape of a sheet 1 is arranged on the outer end surface 14a of the subordinate metal plate 14, even if some distortion occurs on the inner surface of the rectangular waveguide 12, it will be absorbed and electrical contact will be established. It can be done in good condition.

In addition, since the metal plate iris 11 can be attached by simply drilling a hole 15 from the outside of the rectangular waveguide 12, it is possible to actually manufacture a waveguide device with a vacuum window attached, and to install the waveguide device. Even after measuring the rate of microwave reflection by the vacuum window, the metal plate iris 11 can be easily attached. For this reason, the distance d, thickness t, and distance ρ that minimize the microwave reflection rate for the entire waveguide device are determined by taking into consideration manufacturing errors in the waveguide and the permittivity of the vacuum window. It is now possible to accurately take into account characteristics such as, etc., and there is no need to consider fine adjustment of the metal plate iris after it has already been attached to the waveguide, which has been a problem in the past.

Furthermore, the metal plate iris 11 can be easily installed in places where soldering is not possible.

Further, the rectangular waveguide 12 is sometimes made of Aρ in order to make it lighter in weight, but in this case, Aρ has a low melting point and cannot be soldered with silver, which is most suitable for electrical contacts. The metal plate iris 11 of this embodiment is also effective in such cases.

FIG. 3 shows another embodiment of the present invention, in which instead of the solder 17 in the previous embodiment, a metal plate 27 having high elasticity and conductivity, such as phosphor bronze, is attached to the outer end surface 14a of the slave metal plate 14. It was designed to be arranged.

Even with this configuration, the same effects as in the embodiment described above can be expected.

FIG. 4 shows still another embodiment of the present invention, in which the metal plate iris 11 is connected to one main metal plate 23 and one secondary metal plate 2.
4, the inner end surfaces 23b, 24b of each metal plate 23, 24 are brought into close contact with each other as corresponding slopes, and a screw member 16 is inserted from the outside of the rectangular waveguide 12 through the hole 15. , the through hole 2 provided in the secondary metal plate 24
Even with this configuration, the outer end surface 23a of each metal plate 23, 24 can be tightened by the screw member 16.

24 a Jj and the lower end surfaces of the slave metal plate 24 are in close contact with the inner surface of the rectangular waveguide 12, and the inner end surfaces 23b and 24b of both metal plates 23 and 24 are in close contact with each other, and the same effect as in the previous embodiment is obtained. can get. In the case of this embodiment, better electrical contact can be obtained by disposing the solder 17 or the metal plate 27 in each of the embodiments described above on the outer end surfaces 23a, 24a of both metal plates 23, 24.

Although not specifically explained in the above embodiments, SF6 gas or the like is sealed inside the rectangular waveguide 12 at atmospheric pressure or pressurized for the purpose of preventing discharge, and the gas is then passed through the rectangular waveguide 12. In some cases, the power of the microwave may be increased. In this case, there is a risk that the gas may leak through the hole 15 of the rectangular waveguide 12. So in this case,
It is preferable to seal between the screw member 16 and the rectangular waveguide 12 by brazing or the like.

〔Effect of the invention〕

As explained above, the present invention comprises a metal plate iris consisting of one main metal plate and a required number of secondary metal plates whose end surfaces are in contact with each other, and the main metal plate is inserted from outside the waveguide. Tightening is possible with a screw member, and the contact surface between the main metal plate and the subordinate metal plate is a wedge surface that is inclined with respect to the direction in which the main metal plate is tightened, and the subordinate metal plate is fixed. Therefore, the metal plate can be easily attached even in places where brazing is difficult, and good electrical contact can be obtained.

In addition, since it is easy to install, you can install the optimal metal plate iris after actually measuring the microwave reflection rate, etc., and you can perform tasks such as fine-tuning the shape of the metal plate once it has been removed. is not necessary.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a metal plate iris showing one embodiment of the present invention, Fig. 2 is a block diagram of the metal plate iris seen from above Fig. 1, and Fig. 3 is a block diagram showing another embodiment of the present invention. FIG. 4 is a diagram corresponding to FIG. 2, FIG. 4 is a diagram equivalent to FIG. 1 showing still another example of the present invention, and FIG. Figure (b) is a right side view of figure (a), and Figures 6 and 7 are partially cutaway perspective views showing the structure of the conventional metal plate iris installation. 11... Metal plate iris, 12... Rectangular waveguide, 1
3.23... Raw gold ii, 13 a... Side end surface, 1
4゜24...Slave metal plate, 14a, 23a, 24a...
・Outer end surface, 14b, 23b, 24b...inner end surface,
15... Hole, 16... Screw member, 17... Solder,
25... Through hole, 27... Metal plate. Applicant's representative Mr. Sato Figure 1 Figure 3 Figure 4 Figure 1 PJ5 Figure

Claims (1)

[Claims] 1. In a waveguide device in which a metal plate iris is installed in a waveguide, the metal plate iris is formed by one main metal plate and a required number of secondary metal plates whose end surfaces are in contact with each other. The main metal plate can be tightened by a screw member inserted from outside the waveguide, and the contact surface between the main metal plate and the secondary metal plate is a wedge surface that is inclined with respect to the tightening direction of the main metal plate. A waveguide device characterized in that a secondary metal plate is fixed as a secondary metal plate. 2. The waveguide device according to claim 1, wherein a metal plate sheet having high elasticity and waveguiding properties is disposed on the contact surface of each metal plate with the inner surface of the waveguide. .