JPH10270902A - Structural body for air-tight window for waveguide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the structural body for air-tight window for waveguide by which deformation or damage of a support member with a transmission window adhered thereto is reduced. SOLUTION: The air-tight window structural body is provided with a dielectric transmission window 13a placed to interrupt a transmission line consisting of waveguides 11, 12, a support member 13b to which the dielectric transmission window 13a is connected, and a cooling path 13c through which a coolant to cool the dielectric transmission window 13a is flowed. In this case, a wall member 13d is provided between the support member 13b and the cooling path 13c and a heat conduction medium 16 is placed between the wall member 13a and the support member 13b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airtight window structure of a waveguide used for a microwave tube such as a klystron.

[0002]

2. Description of the Related Art In a microwave tube such as a klystron or a gyrotron, it is necessary to maintain the inside of a waveguide connected to an output portion in a vacuum, and for this purpose, an airtight window structure of the waveguide is used. The hermetic window structure of the waveguide has a transmission window made of, for example, dielectric ceramics so that microwaves can be transmitted, and the transmission window is arranged so as to block a transmission path of the waveguide.

A conventional waveguide hermetic window structure will be described with reference to FIG. Reference numeral 21 denotes an output waveguide.
An output unit such as a klystron (not shown) is configured. The rectangular output waveguide 21 is connected to an external waveguide 22, and the external waveguide 22 is connected to an external circuit (not shown). Therefore, the microwave output of the klystron is supplied to an external circuit via the output waveguide 21 and the external waveguide 22. An airtight window structure 23 is interposed between the flanges 21a and 22b of the output waveguide 21 and the external waveguide 22.

The hermetic window structure 23 includes a plate-shaped transmission window 23a made of alumina ceramics, a support member 23b to which the periphery of the transmission window 23a is joined, and a transmission window 23.
The cooling medium 23a is configured by a cooling medium for cooling the cooling medium a, for example, a cooling path 23c through which cooling water flows. The cooling passage 23c is connected to a cooling water supply pipe 24 on the upper side in the figure, and is connected to a discharge pipe 25 on the lower side in the figure. The transmission window 23a is arranged so as to block a microwave transmission path for transmitting the output waveguide 21 and the external waveguide 22.

[0005] The hermetic window structure of the waveguide having the above-described structure causes a transmission window 23 due to dielectric loss of ceramics, loss due to a coating film for suppressing a multipactor phenomenon, and the like.
The temperature of a rises. Therefore, the transmission window 23a is cooled by the cooling water flowing through the cooling passage 23c.

[0006]

The outer periphery of the transmission window 23a constituting the airtight window assembly 23 is joined to the support member 23b by, for example, brazing. In this case, the support member 2
Copper is usually used for 3b. When the transmission window 23a formed of alumina ceramics and the support member 23b formed of copper are brazed to each other, the thickness of the support member 23b is reduced in order to reduce the influence of the difference in thermal expansion between the two. For this reason, the support member 23b is deformed by the pressure of the cooling water flowing through the cooling passage 23c, and may be damaged in severe cases.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and to provide an airtight window structure of a waveguide in which deformation and breakage of a support member to which a transmission window is joined is reduced.

[0008]

According to the present invention, there is provided a dielectric transmission window arranged so as to block a transmission path of a waveguide, a support member to which the transmission window is joined, and a cooling device for cooling the transmission window. In a hermetic window structure of a waveguide having a cooling passage through which a cooling medium flows, a wall member is provided between the support member and the cooling passage, and a heat transfer medium is provided between the wall member and the support member. Is arranged.

Further, the present invention is characterized in that the wall member is made thicker than the support member.

[0010] Also, the heat conduction medium is mercury.

Further, the present invention is characterized in that the wall member is made of Cu.

According to the above configuration, the wall member is provided between the support member and the cooling passage. For this reason, the pressure of the cooling medium is applied to the wall member and not directly to the support member. Therefore, deformation and breakage can be prevented even if the support member is formed thin. Also, since the support member can be made thinner,
There is no problem of a difference in thermal expansion between the transmission window and the transmission window when the transmission window is brazed.

Further, since the wall member does not have a structure in which the transmission window is joined, the difference in thermal expansion from the transmission window does not matter, and the wall member is formed thicker than the support member. In this case, the strength of the wall member is large enough to withstand the pressure of the cooling medium,
As a result, an airtight window structure of a waveguide having sufficient strength without deformation or breakage of the support member can be realized.

[0014]

Embodiments of the present invention will be described with reference to FIG. Reference numeral 11 denotes an output waveguide having a rectangular cross section that forms an output unit such as a klystron (not shown). The output waveguide 11 is connected to, for example, an external waveguide 12 having a rectangular cross section, and the external waveguide 12 is connected to an external circuit (not shown). Therefore, the microwave output of the klystron is transmitted to an external circuit via the output waveguide 11 and the external waveguide 12. The respective flanges 11 of the output waveguide 11 and the external waveguide 12
An airtight window structure 13 is interposed between a and 12b.

The hermetic window assembly 13 includes a plate-shaped transmission window 13a made of alumina ceramics, a frame-shaped support member 13b to which an end surface around the transmission window 13a is joined, and an outer periphery of the support member 13b. It comprises a frame-shaped wall member 13c arranged at a certain distance from the support member 13b, and a cooling medium for cooling the heat generated by the transmission window 13a, for example, a cooling path 13d through which cooling water flows. The cooling passage 13d is formed, for example, in an annular shape along the outer surface of the wall member 13c forming a part of the cooling passage 13d, and is connected to the cooling water supply pipe 14 on the upper side of the figure, and is connected to the lower side of the figure. Is connected to the discharge pipe 15. Further, the transmission window 13a is connected to the output waveguide 11 or the external waveguide 12
Are arranged in such a way as to block the transmission path of the microwave output for transmitting the microwave. The heat conduction medium 16, for example, mercury is disposed in a space between the support member 13b and the wall member 13c. The wall member 13c is formed of copper or the like,
In order to increase the strength, the thickness is made thicker than the support member 13b.

According to the above configuration, the heat of the transmission window 13a is transferred from the support member 13b through the heat conduction medium 16 to the wall member 1a.
3c. Then, the heat transmitted to the wall member 13c is cooled by the cooling water flowing through the cooling path 13d.

By the way, the above-mentioned airtight window structure of the waveguide is provided between the support member 13b and the cooling passage 13d.
c is provided. The transmission window 13a is joined to the support member 13b, but not joined to the wall member 13c. For this reason, the wall member 13c does not need to consider the thermal expansion difference at the time of brazing with the transmission window 13a, and can be formed to have a thickness having a strength sufficient to withstand the pressure of the cooling water.
The support member 13b can be made thin because it does not have a structure in which the pressure of the cooling water is directly applied. Further, even if the support member 13b is thin, the occurrence of deformation, breakage, and the like is reduced. Further, since the thickness of the support member 13b can be reduced, there is no problem of a difference in thermal expansion from the transmission window 13a when the transmission window 13a is brazed.

In the above embodiment, the support member 1
In the description, mercury is used as the heat conductive medium disposed between the wall 3b and the wall member 13c. However, a low-melting-point medium used for a heat pipe or the like can be used as the heat conduction medium.

[0019]

According to the present invention, an airtight window structure of a waveguide in which deformation and breakage of a support member to which a transmission window is joined is reduced can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional example.

[Explanation of symbols]

 11, 12: Waveguide 13: Airtight window structure 13a: Transmission window 13b: Support member 13c: Wall member 13d: Cooling path 14: Supply pipe 15: Discharge pipe 16: Heat transfer medium

Claims (4)

[Claims] 1. A dielectric transmission window arranged to block a transmission path of a waveguide, a support member to which the transmission window is joined, and cooling for flowing a cooling medium for cooling the transmission window. And a wall member is provided between the support member and the cooling path, and a heat transfer medium is disposed between the wall member and the support member. Airtight window structure of waveguide. 2. The airtight window structure for a waveguide according to claim 1, wherein the wall member is thicker than the support member. 3. The hermetic window structure of a waveguide according to claim 1, wherein the heat conduction medium is mercury. 4. An airtight window structure for a waveguide according to claim 1, wherein the wall member is made of Cu.