JPS6325636Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flexible heater insertion/extraction device for preheating piping inside a nuclear reactor vessel.

A flexible heater for preheating piping inside the reactor vessel is usually inserted into a guide tube provided along the piping to be preheated, and is energized to preheat the piping to be preheated.

However, in the reactor vessel room, the pulled out flexible heater is expected to be contaminated with radiation due to radiation leakage from the guide tube and other factors, and therefore it is not possible to pull it out directly by hand.

The present invention has been developed in consideration of the above, and provides a flexible heater insertion/extraction device that allows a flexible heater to be inserted and pulled out without directly touching the flexible heater due to radiation contamination, and also allows for easy connection of terminal portions of the flexible heater. The purpose is to

The present invention will be explained below with reference to examples.

1 to 3 are cross-sectional views of one embodiment of the present invention.

Reference numeral 1 denotes a containment vessel that shields radiation. A drum 3 having a hollow main shaft 2 is rotatably mounted inside the containment vessel 1. One end side of the hollow main shaft 2 protrudes from the containment vessel 1, and can be rotated in forward and reverse directions via a coupling 4. The drum 3 is connected to the shaft of a torque motor 5, and the rotation of the torque motor 5 rotates the drum 3 in the forward and reverse directions.

Note that 6 and 7 are bearings for the main shaft 2, and 8 and 9 are a mounting for the torque motor 5 and a bearing for the bearing 7.

A flexible heater 10 is wound around the drum 3, and the winding start end of the flexible heater 10 is passed through the main shaft 2 and connected to a connector 1 fixed to the other end of the main shaft 2.
Connect to 1.

On the other hand, the winding end side of the flexible heater 10 is connected to a feed roller 12 rotating in synchronization with the drum 3 and a guide tube 15 connected to the containment vessel 1 by a coupling flange 14 via a guide roller 13.
Configure it so that you are guided within.

On the other hand, a shaft 18 of a handle 17, which faces the connector 11 fixed to the main shaft 2 and has a connector 16 attached to the connector 11 fixed at its tip, is provided so as to be rotatable and slidable through the containment vessel 1. 17 is sealed to the containment vessel 1 by a bellows 19 that seals the shaft 18 and the containment vessel 1, and seals 20 and 21 fixed to both ends of the bellows 19.

The connector 16 penetrates through the containment vessel 1 and is electrically connected to a fixed terminal block 22 by wiring.

Note that 23 and 24 are guide plates and fixtures for supporting the shaft 18 of the handle 17, and as shown in FIG. 4, the guide 23 has an elongated hole 25 to enable the fixture 24 to slide. Cage, long hole 25
The fixture 24 and the guide 23 are fixed at a predetermined position, and the protrusion 26 provided on the shaft 18 and the fixture 24 are fixed at a predetermined position.
The shaft 18 is configured to stop sliding upon contact with the shaft 18.

In the flexible heater insertion/extraction device of this embodiment configured as described above, when inserting a flexible heater, by rotating the torque motor 5 in the forward direction, the flexible heater 10 wound on the drum 3 is unwound. It will be done.

At the same time, the feed roll 12 also rotates in the forward direction to sequentially pass the length of the rewound flexible heater 10 through the guide tube 1 through the guide roll 13.
Insert it into 5.

In this case, the connector 11 rotates with the rotation of the drum 3, and since the connectors 11 and 16 are not attached, the flexible heater 10 will not be twisted.

Furthermore, the wiring between the connector 16 and the terminal block 22 is not affected by the rotation of the drum.

When the insertion of the flexible heater 10 into the guide tube is completed, the rotation of the drum 3 is stopped.

Since the rotation of the drum 3 has stopped, the handle 17 is rotated while being pressed, and the connector 1
6 to the connector 11.

In this case, the connector 11 is provided with a dowel hole, and the connector 16 is provided with a guide pin, etc., so that the connector 11 and the connector 16 are not incorrectly attached when they are attached.
The position of the notch hole and the guide pin may be aligned by turning 7.

Further, in this case, the connectors 11 and 16 can be easily attached by configuring the open end of the notch hole A to be wide at the end and the tip end side of the dot pin B to be narrow, as shown in FIG.

By attaching the connectors 11 and 16, the flexible heater 10 and the terminal block 22 are connected to the connectors 11 and 1.
By applying a voltage to the terminal block 22, the flexible heater 10 is energized and the piping to be preheated can be preheated.

When the connectors 11 and 16 have been attached, the fixture 24 is moved to a position where it abuts the protrusion 26 of the shaft 18, as shown in FIG. Just fix that position.

Next, when the flexible heater 10 is to be pulled out, the attachment between the connectors 16 and 11 is released by loosening the fixture 24 and guide 23 and pulling the handle 17.

After the connectors 11 and 16 are unattached, the flexible heater 10 is wound around the drum 3 by rotating the torque motor 5 in the opposite direction.

In this case, the feed roller 13 also rotates in the opposite direction,
The flexible heater 10 is sent from inside the guide tube 15 to the drum 3 side in accordance with the amount of winding of the flexible heater 10.

As described above, insertion of the flexible heater 10,
At the time of extraction, the flexible heater 10 is not touched directly, and the connector can be attached and unattached from outside the containment vessel 1. Therefore, even if the flexible heater 10 is contaminated with radiation, it is easy to insert and remove the connector. It has no effect on the human body.

Furthermore, although the above description has been made using an example in which only the flexible heater 10 is inserted and pulled out, a thermocouple is usually attached to the flexible heater 10 to detect the preheating temperature.

Since this thermocouple is also flexible, it is wound around the drum 3 together with the flexible heater 10, and the beginning of the winding is passed through the main shaft 2 and connected to the connector 11 in the same way as the flexible heater 10.
It is sufficient that the flexible heater 10 is configured so that it can be drawn out to the terminal block 22 through the connector 16.
The thermocouple can be inserted and removed at the same time as the thermocouple.

As explained above, according to the present invention, the flexible heater is stored inside the containment vessel, and its insertion and removal can be performed from outside the containment vessel, allowing the operator to work safely even when the flexible heater is contaminated with radiation. It is easy to operate, and the terminals can be easily connected.

[Brief explanation of drawings]

1, 2 and 3 are cross-sectional views of one embodiment of the present invention. FIG. 4 is a detailed view of the guide and fixture portion in one embodiment of the present invention. FIG. 5 is an explanatory diagram of the connector section. 1: Containment vessel, 2: Hollow shaft, 3: Drum, 5:
Torque motor, 10: Flexible heater, 11
and 16: connector, 12: feed roller, 1
5: Guide tube, 17: Handle, 18:
Axis, 22: Terminal block.

Claims (1)

[Scope of utility model registration request] a containment vessel that shields radiation; a drum rotatably provided within the containment vessel with a hollow shaft having one end protruding from the containment vessel and having a first connector fixed to the other end as a rotation axis; and the first connector. a handle that has a shaft fixed to one end thereof and has a shaft fixed to one end of a second connector that faces the first connector and is connected to the first connector; and a handle that is slidably and rotatably protruded outside the containment vessel; and a handle that is wound around the drum. The beginning of the winding is connected to the first connector through the inside of the hollow shaft, and the end of the winding is inserted into or connected to a guide tube fixed to the storage container by a feed roller rotating in synchronization with the same direction as the drum. a flexible heater that is pulled out from the guide tube; a terminal block that is fixed through the storage container and electrically connected to the second connector; and a terminal block that is connected to one end of the hollow shaft and rotates in forward and reverse directions. and a drive device capable of rewinding the flexible heater by rotating the drive device in one direction when inserting the flexible heater into the guide tube;
After insertion, the first
and a second collector, and when the flexible heater is pulled out from the guide tube, the handle is slid to release the connection between the first connector and the second connector, and then the drive device is moved in the other direction. A device for inserting and extracting a flexible heater, characterized in that the device rotates to involve the flexible heater.