JPS60166889A - Vacuum vessel inner-wall maintaining device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an apparatus for performing maintenance work on the inner wall of a vacuum vessel of, for example, a nuclear fusion reactor.

[Prior art]

The inner wall of this type of vacuum container is coated with titanium, and conventional inner wall maintenance work involves melting and diffusing the titanium ball by applying high voltage and large current to the titanium ball held in a predetermined position inside the vacuum container. , the damaged part of the titanium coating was repaired. The titanium ball is attached to the tip of the shaft-like structure. In order to maintain a vacuum atmosphere inside the vacuum container, the outside of the shaft-shaped structure is surrounded by a tubular guide, and this tubular guide is connected to a predetermined part of the vacuum container to create a vacuum inside the vacuum container and the tubular guide. When applying titanium coating, the shaft-shaped structure is suspended in the tubular guide and driven up and down by a drive mechanism installed at the top of the tubular guide in an atmosphere. The titanium ball attached to the tip of the tube was lowered to the predetermined position in the vacuum container, and after the titanium coating was completed, the shaft-like structure and the titanium ball were placed back into the tubular guide. A high-voltage conductor assembly is connected to the titanium ball to supply electricity to it, but the outside of the high-voltage conductor assembly is coated with an inorganic insulator to electrically insulate the high-voltage conductor assembly from the shaft-shaped structure. .

The conventional device is configured as described above, and the titanium balls can be melted and diffused only at one predetermined location within the vacuum container, and only the portion of the vacuum container where the coating needs to be repaired is selected. It was not possible to apply a localized titanium coating. Furthermore, it did not have a means for observing the state inside the vacuum container. Therefore, it is not necessary to consume more titanium balls than necessary, and the work time required for coating is long, and it is necessary to replace the titanium balls many times, which poses problems in terms of economic efficiency. In addition, there was a drawback that the situation after coating could not be grasped.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and this invention assumes x-y-z orthogonal coordinate axes with two axes in the axial direction of the tubular structure connected to the vacuum container. It is capable of moving up and down in the Z-axis direction, protrudes in the direction perpendicular to the Z-axis, and moves X-Y around the Z-axis.
By providing an arm tip that can rotate within a plane, mounting a movable block on the arm tip that can freely move in the direction of its length, and attaching a titanium evaporation source to this movable block. , a titanium evaporation source can be melted and diffused at any coordinate position on the x-y-z coordinate axes within a predetermined range within the vacuum container, and an image guide imaging unit and a light guide radiation end attached to the tip of the arm are provided. This allows observation of the situation inside the Toyoshi vacuum container.

In history, a high-voltage conductor assembly for supplying current to the titanium deposition source, a winding mechanism capable of winding up the slack of the image guide from the image guide imaging section and the light guide reaching the light guide emission end were installed, and the high-voltage A relay support part capable of fixing the positions of the conductor assembly, the image guide, and the light guide in the X-'Y plane is provided,
A titanium deposition prevention mechanism that facilitates the operation of each drive system when moving the position of the titanium deposition source and prevents titanium from being deposited on the surface of the image guide imaging section and light guide radiation end that transmits the light beam, and a vacuum In order to estimate the thickness of the titanium layer deposited on the inner wall of the container, a titanium deposition amount monitor plate is provided in a position where it can be easily observed, improving operability and reliability as a vacuum container inner wall maintenance device.

[Invention dormitory example]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing one embodiment of the present invention, in which (1) is a drive unit, (2) is a tubular structure, (3) is a gate valve, (4) is a vacuum container, ( 5) is a vacuum container (
4) is a boat connected to By opening and closing the gate valve (3), the vacuum container (4), the boat (5), and the internal atmosphere of the tubular structure (2) are ventilated or cut off. (
6) Hiro arm main body, (7) arm rotation part, (8) arm tip, (8a) drive wire, (8b) relay support part, (9) titanium evaporation source, uO high voltage 4 Scarlet assembly, α is the high-voltage conductor support ring, (6) is the image guide imaging section, (12a) is the image guide, 13 is the vacuum pump unit, α4 is the operation panel, αυ is the winding mechanism box, U
S is the winding drum, αη is the optical connector, Q8 is the television set,
camera, the song is on a monitor receiver.

Next, Fig. 2 is an explanatory diagram showing the principle of the image guide (12a), where 02 is the image guide imaging section like the same reference numerals in Fig. 1, the handle is the image receiving section, the cy 9 is the image, and the (c) is the subject. be. Moreover, FIG. 3 is a detailed explanatory diagram of the vicinity of the arm tip (8) in FIG. 1, where the same reference numerals as in FIG. ,
(c) is the light guide radiation end, (25a) is the titanium deposition prevention mechanism 1. (25b) is a titanium evaporation amount monitor plate.

The image guide (12 m) is composed of, for example, tens of thousands of ultra-fine silica-based optical fibers arranged in an array, one end of which constitutes the image guide imaging section (2), and each optical fiber of the image guide imaging section (2) The light incident on the end is transmitted by the image guide (12m) and connected to the optical connector (2).
The image is received by the television camera and camera α, and displayed on the monitor television receiver A.

The light guide (the light guide is not shown in FIGS. 1 and 3, and only the light guide radiation end (c), which is one end of the light guide, is shown in FIG.
), and light from a light source (not shown) passes through the light guide and is emitted from the light guide radiation end (c) to illuminate the inner wall of the vacuum container (4). Since titanium must not be deposited on the light-transmitting surfaces of the image guide receiving section (2) and the light guide emitting end q, to prevent this, the image guide receiving section (2) and the light guide emitting end q should not be deposited on the surface of the image guide receiving section (2) and the light guide emitting end q. Titanium deposition prevention mechanism (2
5a) is provided, and a titanium deposition amount monitor plate (25b) is provided to monitor the amount of titanium deposited on the inner wall of the vacuum vessel (4).
) is provided.

The drive part (1) connects the arm body part (6) to the tubular structure (2).
and a state in which it is driven vertically within the boat (5), and the axes of the arm tip (8) coincide with two axes (not shown), and a state in which the axes lie in a circle on the x-y plane. (the state shown in Figure 1) and the arm rotating part (
The titanium evaporation source (9) is attached to the movable block (E) by rotating the arm tip (8) around two axes through the cam flow (5) and winding the drive wire (8a) through the cam flow (C). the position within the arm tip (8).

A high voltage conductor support ring αυ is provided so that the high voltage conductor assembly αO can easily expand and contract while maintaining its insulation when the position of the movable block bracket changes.

The tubular structure (2) is connected to the boat (5), the movable block (c) is set at a predetermined position by controlling the drive unit fil from the operation panel a4, and the vacuum pump unit 03 is controlled from the operation panel a4. After controlling the vacuum chamber (4) to create a vacuum atmosphere, a current is applied to the titanium vapor deposition source (9) to melt and diffuse the titanium. Further, the inner metal area of the vacuum container (4) can be monitored by the image guide imaging unit α2 fixed to the arm tip (8). The light guide is an image guide (12a
), the light from the light source is transmitted using optical fiber,
Illuminate the inside of the vacuum container (4).

The image guide (12a) shows the situation inside the vacuum container (4) where the subject (a) is placed in the image guide imaging unit (6).
When the signal reaches the image guide receiver section 4, it is converted into a smudge signal by the television camera and displayed as an image on the monitor receiver.

As described above, it is possible to locally repair the titanium coating and observe the situation inside the vacuum vessel before and after the repair.

FIG. 4 is an explanatory diagram showing the internal structure of the winding mechanism box in FIG. 1. In the figure, the same symbols as in FIG. 1 indicate the same parts.
) is the drum shaft of the winding drum αQ, and ) is the drum shaft (2)
(7) is the shaft seal, (4) and (7) are the reduction gears, (3) is the motor for driving the drum shaft (2), and (3) is the electric wire penetration part. The inside of the winding mechanism box (to) is kept airtight with the outside air by the shaft seal), the wire penetration part 64, and the connection mechanism of the optical connector αη, and the high pressure 4 is maintained between the winding mechanism box and the tubular barrel (2). A wire assembly and an image guide (12a) are connected for passage therethrough.

When the arm body (6) is moved in two axial directions by the drive unit ill, the arm tip (6) is moved from the arm body (6) to the arm tip (
8) The high-voltage conductor assembly αO, the image guide (c), and the light guide, which are provided by cutting, may be sagging or tension may be applied to the arm. Main body (6
), the drum shaft (c) is rotated to perform winding or unwinding onto the winding drum uO.

By providing such a winding mechanism, it is possible to improve the drive characteristics of the arm drive system and prevent deterioration of the high voltage conductor assembly αO, the image guide (12a), and the light guide.

FIG. 5 is a partially cutaway oriented view of the relay support part (8b) of FIG. 1. In the figure, the same symbols as in Figure 1 indicate the same parts, (G) is the guide roller, (B) is the spring, (F) is the fixing bracket, (TO) is the fulcrum of the fixing bracket (TO), and zero force. is the relay support drive wire. The relay support part (8b) has a cylindrical structure, and a guide roller (
A) is always in contact with the inner surface of the boat (5) by the spring (B), and the drive part (1) is connected via the relay support part drive wire 67).
) is driven in two axial directions. In the axial direction (i.e. Z-axis direction) of the relay support part (8b), the arm main body part (6) and the high voltage conductor assembly u+J% image guide (12a
) and a light guide are provided with respective through holes through which the light guides can slide freely. In addition, the high voltage conductor assembly αG and the image guide (12a) are attached to the winding drum αG.
When winding the drive wire (8a) at the position of the relay support part (8b), a fixing metal fitting (G) is attached to the drive wire (8a) in order to fix the position of the high voltage conductor assembly 00 and the image guide in the X-Y plane. The relay support (8b) is fixed at a desired position within the boat (5) by operation. By fixing the positions of the high voltage conductor assembly a1 and the image guide (12a) in the XY plane between the axial length of the relay support part (8b), the winding drum u
Winding in Q becomes extremely easy.

6 is a partially cutaway elevational view showing the structure of the titanium deposition prevention mechanism (25&) and the titanium deposition amount monitor (25b) in FIG. 3, where the same reference numerals as in FIG. 3 indicate the same parts;
) is a screen, that is, an image guide imaging section (2
) and the light guide radiation end - are the surfaces through which the light rays pass, 2) is a cylindrical bellows, (39a) is a fixed flange provided at one end of the bellows, and (39b) is a fixed flange provided at the other end of the bellows. movable flange, (40) is wire for titanium deposition prevention mechanism, (41) is cam follower, (42)
is a titanium-mounted monitor support frame. When observing the inner wall of the vacuum container (4), tension is applied to the wire (40) and the movable flange (39b) is pulled toward the fixed flange (39a), shortening the bellows end and causing the light beam to enter the screen (toward). While the titanium evaporation source (9) is being melted and evaporated by applying current to the titanium evaporation source (9), the tension on the wire (40) is loosened so that the bellows end extends and the movable flange ( 39b) returns to the position shown in FIG. 6 to prevent titanium from being deposited on the screen μs.

In addition, since it is difficult to actually measure the amount of titanium deposited on the inner wall of the vacuum container (4), for example, two monitor plates (25b) are attached to the support frame (42).
The amount of titanium deposited on the inner wall of the vacuum container (4) is estimated from the amount of titanium deposited on the monitor plate (25b).

In the above explanation, the relay support portion drive wire 9 in FIG.
The driving part i
It is υ controlled by l+.

In addition, although the case where this invention is applied to a nuclear fusion reactor was described above, the apparatus of this invention can also be applied to a light water reactor, a fast breeder reactor, etc.

〔Effect of the invention〕

As described above, according to the present invention, the titanium evaporation source is configured so that it can be melted and diffused at any position within a predetermined range within the vacuum container, and is also provided with a function for observing the inside of the container. It is possible to increase the efficiency of maintenance work on the inner wall of the vacuum container and improve technical reliability.

In addition, by providing a winding mechanism, it is easy to arrange the high-voltage conductor assembly, image guide, etc., and its durability can be improved. The structure of the structure could be simplified.

Furthermore, the titanium deposition prevention mechanism prevents the deterioration of the function for observing the inner wall of the vacuum container, and the titanium deposition amount monitor board also solves the problem of conventional difficulty in estimating the amount of titanium deposited on the inner wall of the vacuum container. The problem was solved by providing a system that provided important data for evaluating the results of titanium deposition operations.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the principle of the image guide in Fig. 1, and Fig. 3 is an explanatory diagram showing details of the vicinity of the arm tip in Fig. 1. Figure 4 is an explanatory diagram showing the internal configuration of the winding mechanism box in Figure 1, Figure 5 is
6 is a partially sectional elevational view of the relay support section of FIG. 1, and FIG. 6 is a partially sectional elevational view showing the structure of the titanium deposition prevention mechanism and titanium deposition amount monitor plate of FIG. 3. (1)... Drive unit, (2)... Tubular structure, (3)
gate valve, (4)...vacuum container, (5)...
bow), (61... arm main body part, (7)... arm rotation part, (8)... arm tip part, (8b)...
Relay support part, (9)...Titanium vapor deposition source,...High voltage conductor assembly, 0T...High voltage conductor support ring, (2)
...Image guide imaging unit, (12a)...Image guide, α3...Vacuum pump unit, aυ...
Winding mechanism box, be... Winding drum, αη... Optical connector, α→... Television, camera, α9... Monitor television receiver, wire... Movable block, wire...
・Light guide radiation end, (25a)...Titanium deposition prevention mechanism, (25b)...Titanium deposition amount monitor plate, Oa
...Wire penetration part, Q...Guide roller, (B)...
・Spring, zero...fixing metal fittings, μs...screen, (g)...bellows. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Masuo Oiwa Figure 1 Figure 2 Figure 5 9 to II Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A tubular structure connected to the boat part of a vacuum container, and gas flow between the vacuum container and the vacuum container is blocked or opened by a gate valve, and when this tubular structure is connected to the vacuum container, outside air is A vacuum pump unit that creates a vacuum inside the vacuum container that is kept airtight between the
Assuming X-Y-Z orthogonal coordinates with the axis of the tubular structure as two axes, a rod-shaped arm main body that can move up and down inside the tubular structure in two axial directions; a rod-shaped arm tip extending from the lower end and configured such that its direction of extension can be changed with respect to the axial direction of the arm main body; an arm rotation device that rotates the arm tip around the two axes; a movable block mounted on the arm tip and movable along the length of the arm tip, a titanium deposition source attached to the movable block, and a source for supplying current to the titanium deposition source; A high-voltage conductor assembly disposed through the tubular structure to the titanium evaporation source, a cleaning portion being held at a plurality of locations at the tip of the arm of the high-voltage conductor assembly;
A plurality of high-voltage conductor support rings slide on the arm tip as the movable block moves along the length of the arm tip, and the arm is configured to allow light from the inner wall of the vacuum vessel to enter the arm. An image guide imaging unit attached to the tip of the arm, an image guide installed to transmit the light beam incident on the image guide imaging unit to a predetermined location, and an image guide attached to the tip of the arm to illuminate the inner wall of the vacuum container. A light guide emitting end that emits a light beam, a light guide that transmits light to the light guide emitting end, a winding mechanism for winding or unwinding the high voltage conductor assembly, the image guide, and the light guide. , a winding mechanism box connected to the tubular structure and having a structure that maintains airtightness from the outside air, a connector provided on the winding mechanism box and optically coupled to the image guide, and the winding mechanism box. An electric wire penetration part provided in the mechanism box and through which the high voltage conductor assembly passes through,
It is configured to be able to move in the axial direction and stop at any position in the two axial directions, and the arm main body, the high voltage 4-wire assembly, the image guide, and the light guide slidably pass through the arm body in the axial direction. During the melting and expansion operation of titanium, the light transmitting surfaces are covered with a cylindrical bellows to prevent titanium from being deposited on the light transmitting surfaces of the relay support section provided with each through hole, the image guide imaging section, and the light guide radiation end. A shielding titanium deposition prevention mechanism, a titanium deposition amount monitor plate attached to the tip of the arm, vertical movement of the arm main body in two axes, and a combination of the longitudinal direction of the arm tip and the two axes. an angle changing movement for changing the angle; and a rotational movement of the arm tip in the X-Y plane via the arm rotating section;
Movement of the movable block in the length direction of the arm tip, opening and closing of the bellows of the titanium vapor deposition prevention mechanism, movement of the relay support part in two axial directions, and fixing to prevent movement. A vacuum container inner wall maintenance device equipped with a drive unit that moves the position of the metal fittings.