JPH11186802A - Air-tight window structure for microwave tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airtight window structure for a microwave tube whose the temperature rise can be suppressed. SOLUTION: In an air-tight window structure for a microwave tube provided with a 1st waveguide 11 that is provided with a 1st flange 11a at its end, a 2nd waveguide 12 that constitutes a common output transmission line together with the 1st waveguide 11 and provided with a 2nd flange 11b at its end, a transmission window 14 that partitions the inside of a 3rd waveguide 13 air- tightly placed between the 1st waveguide 11 and the 2nd waveguide 12 and through which a microwave transmits and a 1st cooling path 15 provided between the 1st flange 11a and the 2nd flange 11b, 2nd cooling paths 18a, 18b (18c, 18d) are formed to the 1st flange 11a and (2nd flange 11b).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hermetic window structure for a microwave tube connected to an output portion of a microwave tube such as a klystron.

[0002]

2. Description of the Related Art In a microwave tube such as a klystron, a traveling wave tube, and a gyrotron, an airtight window structure for a microwave tube is used to keep the inside of a waveguide connected to an output portion of the microwave tube to a vacuum. . The microwave tube hermetic window structure includes a waveguide portion for transmitting microwave output, a dielectric ceramic transmission window for partitioning the inside of the waveguide hermetically and transmitting microwaves, and the like.

Here, a conventional hermetic window structure for a microwave tube will be described with reference to FIG. 3A is a cross-sectional view, and FIG. 3B is a view of FIG. 3A as viewed from the left.

Reference numeral 31 denotes a first waveguide, and reference numeral 32 denotes a second waveguide. These two waveguides 31, 32 form a transmission line for transmitting microwave output. in this case,
For example, the first waveguide 31 is located on the output side of a microwave tube (not shown) such as a klystron. A first flange 31a and a second flange 32a are provided at ends of the first waveguide 31 and the second waveguide 32, respectively.

A first flange 31a and a second flange 32a
Between them, for example, a circular waveguide 33, a transmission window 34, and a cooling water channel 35 surrounding the circular waveguide 33 are provided. The cooling water passage 35 has a supply port 36 for supplying cooling water, and a discharge port 3 for discharging cooling water.
7 are provided. The cooling water passage 35 is formed in a loop shape surrounding the circular waveguide 33. Reference numeral 38 denotes a screw provided between the first flange 31a and the second flange 32a, which fixes the circular waveguide 33, the transmission window 34, the cooling water passage 35, and the like between the first flange 31a and the second flange 32a, respectively. ing.

In the above configuration, the inside of the first waveguide 31 located on the side of the microwave tube is kept at a vacuum, and the inside of the second waveguide 32 is filled with a vacuum or an insulating gas. When the microwave tube is activated, the microwave output is transmitted from the first waveguide 31 through the transmission window 34 to the second waveguide 32. At this time, loss occurs in the transmission window 34 and the like, and the temperature around the transmission window 34 increases. In order to suppress such a rise in temperature, cooling water is supplied to the cooling water passage 35 to cool the periphery of the transmission window 34.

[0007]

The conventional hermetic window structure for a microwave tube includes a circular waveguide 33 to which a transmission window 34 is fixed.
The portion is cooled with cooling water to suppress a rise in temperature around the transmission window 34. However, in the case of a klystron or the like having a high output power, since the microwave power transmitted through the transmission window 34 is large, the loss at the transmission window 34 increases. For this reason, the temperature rise becomes large, which may adversely affect the vacuum tightness.

An object of the present invention is to solve the above-mentioned disadvantages and to provide a hermetic window structure for a microwave tube capable of suppressing a rise in temperature.

[0009]

According to the present invention, there is provided a first waveguide section having a first flange provided at an end, a common output transmission line together with the first waveguide section, and A second flange portion provided with an end at a second flange portion, and an inside of a third waveguide portion between the first waveguide portion and the second waveguide portion airtightly partitioned, And a transmission window through which microwaves pass,
In a microwave tube hermetic window structure provided with a first cooling channel provided between the first flange and the second flange, a second cooling channel is formed in at least one of the first flange and the second flange. ing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1A is a sectional view, and FIG.
(B) is the figure which looked at FIG. 1 (a) from the left side.

Reference numerals 11 and 12 are a first waveguide and a second waveguide. Each of the first waveguide and the second waveguide has a rectangular waveguide whose opening is, for example, rectangular, and is connected to an output portion of a microwave tube (not shown) such as a klystron. These two waveguides 11 and 12 constitute a common transmission line for transmitting microwave output, and, for example, the first waveguide 11 is located on the microwave tube side.

A first flange 11a and a second flange 12a are provided at ends of the first waveguide 11 and the second waveguide 12, respectively. There is a predetermined interval between the first flange 11a and the second flange 12a,
Also, between the first flange 11a and the second flange 12a,
A circular waveguide 13 constituting a transmission path for microwave output,
A microwave transmission window 14 made of plate-like alumina ceramics, a loop-shaped first cooling water passage 15 along the wall of the circular waveguide 13 and the like are provided. The first cooling water passage 15 is provided with a supply port 16 for supplying cooling water and a discharge port 17 for discharging cooling water.

Each of the first flange 11a and the second flange 12a has a position slightly above and below the wide tube walls of the first waveguide 11 and the second waveguide 12, respectively. Are provided with two second cooling water passages 18a to 18d.

Reference numeral 19 denotes a screw provided between the first flange 11a and the second flange 12a. The screw 19 connects the circular waveguide 13, the transmission window 14, and the cooling water passage 15 between the first flange 11a and the second flange 12a. It is fixed.

In the above configuration, the inside of the first waveguide 11 located on the side of the microwave tube is kept at a vacuum, and the inside of the second waveguide 12 is filled with a vacuum or an insulating gas. When the microwave tube is activated, the microwave output passes through the transmission window 14 from the first waveguide 11 and is transmitted to the second waveguide 12 to be supplied to a load circuit (not shown). Is done. At this time, cooling water flows through the first cooling water passage 15 and the second cooling water passages 18a to 18d to cool the periphery of the transmission window 14, for example, the circular waveguide 13 and the flanges 11a and 12a.

Here, the second cooling water passages 18a to 18d provided in the first flange 11a and the second flange 12a will be described with reference to FIG. The second cooling water passage 18a
18d have substantially the same structure as each of the flanges 11a and 12a.
The second cooling water passages 18a and 18b provided in the portion 1a will be described.

FIG. 2B schematically shows the first flange 11a and the second cooling water passages 18a and 18b.
The second cooling water passages 18a and 18b are respectively connected to the first waveguide 1
1 is provided in parallel with the tube wall 20 at a position slightly outside the upper and lower tube walls 20 having a larger width. Each of the two second cooling water passages 18a and 18b penetrates a wall portion of the first flange 11a. Further, a supply port 21 for supplying cooling water is
Is connected to the second cooling water passage 18b located below,
An outlet 22 for discharging the cooling water is connected.

The second cooling water passages 18a and 18b provided in the first flange 11a and the second cooling water passages 18c and 18d provided in the second flange 11b are, for example, pipes provided outside the flange portion. To form a single cooling water channel.

For example, the second cooling water passage 18a located above the first flange 11a is connected to the second cooling water passage 18c located above the second flange 11b at the end opposite to the supply port 21 by a pipe (see FIG. (Not shown). Also,
The second cooling water passage 18c is connected to the lower side of the second cooling water passage 18d via a pipe P2 on the side opposite to the side connected to the second cooling water passage 18a. Also, the second cooling water passage 18d
Is connected to the second cooling water passage 18b located below the first flange 11a by a pipe (not shown) on the opposite side to the connection with the second cooling water passage 18c.

Accordingly, the cooling water supplied from the supply port 21 flows through the second cooling water passages 18a, 18c, 18d, 18d.
It flows in the order of b and is discharged from the discharge port 22. As a result, cooling around the transmission window 14, for example, the circular waveguide 13 and the flanges 11a and 12a is performed.

According to the above-described embodiment, mainly the circular waveguide 13 is cooled by the first cooling water channel 15,
At the same time, the flanges 11a and 12a are also cooled by the second cooling water passages 18a to 18d. For this reason, heat generation around the transmission window 14 can be suppressed, and a bad influence on vacuum airtightness can be reduced. In addition, since the structure is simple, an increase in cost can be suppressed.

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 2A shows a state in FIG.
FIG. 2B is a diagram of the first waveguide 11 and the second waveguide 12 as viewed from above the wider tube wall, and FIG. 2B is a diagram of FIG. Flange 11a and second cooling water passage 18
The parts a and 18b are schematically shown. In FIG. 2,
Parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

The second cooling water passage 18a is connected to the first flange 11a.
It is divided into two parts near the center of the part and from the center to the opposite side. The second cooling water passage 18a located on the left side of the drawing penetrates toward the first waveguide 11 near the center. Then, at that portion, the outer surface is in contact with the tube wall of the first waveguide 11 and connected to one end of a third cooling water channel 23 provided in a loop shape. The other end of the third cooling water passage 23 is connected to a second cooling water passage 18a located on the right side of the drawing near the center of the first flange 11a. Although the figure shows only the third cooling water channel 23 provided on one tube wall of the first waveguide 11, it is also provided on the other tube wall parallel to this.

Also in this embodiment, the second cooling water passage 18
The a to 18d and the third cooling water passage 23 are connected by a pipe as in the case of FIG. 1, and are configured as, for example, one cooling water passage.

In FIG. 2A, the second cooling water passage 18
2a is connected to the second cooling water passage 18c by a pipe P1 shown in FIG.
In (b), the second cooling water passage 18c and the second cooling water passage 18d
Are shown.

In the above embodiment, the third cooling water passage 23
Is in contact with the tube wall of the first waveguide 11 and cools the tube wall of the first waveguide 11. Therefore, the temperature rise in the first waveguide 11 can be suppressed, and the adverse effect on the airtightness of the transmission window can be further reduced.

In the embodiment of FIG. 2, the third cooling water passage 24 is provided only in the first waveguide 11. But,
It is also possible to provide both the first waveguide 11 and the second waveguide 13 or only the second waveguide 13.

[0028]

According to the present invention, an airtight window structure for a microwave tube that can suppress a rise in temperature can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic structural diagram for describing an embodiment of the present invention.

FIG. 2 is a schematic structural diagram for explaining another embodiment of the present invention.

FIG. 3 is a schematic structural diagram for explaining a conventional example.

[Explanation of symbols]

 11 First waveguide 11a First flange of first waveguide 12 Second waveguide 12a Second flange of second waveguide 13 Circular waveguide 14 Transmission window 15 First Cooling channel 16: Supply port of first cooling channel 17: Discharge port of first cooling channel 18a to 18d: Second cooling channel 19: Screw 20: Pipe wall of first waveguide 21: Supply port of second cooling channel 22: outlet of the second cooling water channel

Claims (3)

[Claims] 1. A first waveguide portion having a first flange provided at an end, a common output transmission line together with the first waveguide portion, and a second flange provided at an end. The second
A waveguide section, a transmission window through which a microwave is transmitted, and a third waveguide section between the first waveguide section and the second waveguide section that hermetically partitions the inside of the pipe; The first flange and the second
A microwave tube hermetic window structure including a first cooling water passage provided between flanges, wherein a second cooling water passage is formed in at least one of the first flange and the second flange. Airtight window structure. 2. The first waveguide section and the second waveguide section are rectangular waveguides, and the second cooling water passage is a wider wall of the first waveguide section and the second waveguide section. The hermetically sealed window structure for a microwave tube according to claim 1, which is provided in parallel with the structure. 3. The first waveguide portion and the second waveguide portion are rectangular waveguides, and at least one of the first waveguide portion and the second waveguide portion has a wider width. Third in contact with the outer surface of the wall
The hermetic window structure for a microwave tube according to claim 1, wherein a cooling water channel is provided, and the third cooling water channel and the second cooling water channel are connected to each other.