JPH05203793A - Bearing support part of rotary machine - Google Patents

Abstract

PURPOSE:To obtain a bearing support part of rotary machine which enables inspection and maintenance of rotating shaft and bearings thereof which require inspection especially, out of those in rotating machines, in a low radiation dose area putting shielding bodies in between, and therewith substantial decrement of workers' radiation exposure. CONSTITUTION:A bearing support part of rotary machine is provided with a shielding body 15 which is placed between a high radiation dose region 30 and a low radiation dose region 31, a penetrating sleeve 18 which penetrates the shielding body 15, a rotating shaft 14 which is inserted into the penetrating sleeve 18, and a bearing 16 which is fixed to the rotating shaft 14 freely rotatively. Furthermore, the bearing support part is constituted by provision of a bearing support part 17 which is inserted into the penetrating sleeve 18 and supports the bearing 16 as well, an outer step 11 which is formed on an innerside surface of the penetrating sleeve 18 and on an outerside surface of the bearing support part 17, an inner step 12 which is formed on an innerside surface of the bearing support part 17 and an outerside surface of the rotating shaft 14, and finally a blocking part 13 which is formed at a lower part of the bearing support part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary machine bearing support portion in which a device to be rotated provided in a high radiation dose range is installed through a shield for maintenance and inspection in a low radiation dose range.

[0002]

2. Description of the Related Art For example, a conventional rotating machine installed in a high radiation dose range of a nuclear reactor facility to perform maintenance and inspection of the rotated machinery in a low radiation dose range through a shield. The bearing support is shown in FIG.

The rotating device 1, which is the target device of the rotating machine, is
A shaft seal portion is formed by the water seal rotary plate 3 and the shaft seal water seal 2 which are integrated with the rotary shaft 4. The rotating shaft 4 penetrates the shield 5 from the high radiation dose region 30 and is connected to a rotating machine (not shown) existing in the low radiation dose region 31. The shield 5 is made of concrete, steel or the like and can shield radiation.

The rotary machine bearing support portion has a penetrating sleeve 8 penetrating the shield 5, the rotating shaft 4 inserted into the penetrating sleeve 8, and a bearing 6 rotatably fixed to the rotating shaft 4. And a bearing support portion 7 that supports the bearing 6.

In this conventional structure, the state where the rotary machine bearing support holding bolt 9 is removed and the rotary machine bearing support portion 7 is integrated with the rotary shaft 4 into the low radiation dose region 31 for maintenance and inspection. As shown in FIG. In this state, the radiation from the high radiation dose region 30 side directly enters the low radiation dose region 31 side through the penetrating sleeve 8. In the low radiation dose area 31, this radiation becomes a source of radiation exposure for the worker and increases the air dose. Therefore, it is necessary to install the temporary shield 10 between the upper portion of the penetrating sleeve 8 and the rotary shaft 4. A worker may be temporarily exposed to radiation when the temporary shield 10 is installed.

[0006]

The movable part of the rotary electric machine for nuclear facilities uses a material having excellent corrosion resistance, but there are some members that require maintenance and inspection due to wear due to rotation. In particular, the rotating shaft and bearings require regular inspection.

For this reason, with respect to the equipment handled in the high radiation dose region of the nuclear facility, the equipment and the layout are designed in consideration of efficient maintenance and inspection and minimizing the radiation dose during work.

However, at the time of maintenance and inspection of the parts related to the movable part, there is a possibility that radiation from the radiation source may directly enter the inspection place through the opening at the same time when the parts are taken out. Therefore, a temporary shield should be installed. It may not happen.

As described above, when the rotating shaft and the bearing are inspected and replaced, there is a problem that an employee may be temporarily exposed to radiation when these parts are removed and a temporary shield is set.

The present invention has been made in consideration of the above points, and at the time of maintenance and inspection of rotating equipment, the rotating machine bearing support portion can reduce the radiation exposure of employees without directly receiving radiation from a high radiation dose range. Is intended to provide.

[0011]

In order to achieve the above object, in the present invention, a shield interposed between a high radiation dose region and a low radiation dose region, and a through hole penetrating this shield are provided. A through-sleeve formed inside, a rotating shaft connected to the shaft of a rotating machine inserted into the through-sleeve, a bearing rotatably fixed to the rotating shaft, and the bearing inserted into the through-sleeve. In a bearing support part for a rotary machine, which comprises a bearing support part for supporting, an outer step is formed on the inner surface of the through sleeve and an outer surface of the bearing support part, and an inner step is formed on the inner surface of the bearing support part and the outer surface of the rotating shaft. However, the present invention also provides a bearing support part for a rotating machine, characterized in that a closing part that can close the gap between the bearing support part and the through sleeve when the bearing support part is pulled up is formed in the lower part of the bearing support part. ..

[0012]

With this structure, the radiation from the high radiation dose region is shielded by the shield installed between the high radiation dose region and the low radiation dose region. An outer step is formed on the inner surface of the penetrating sleeve formed by penetrating the shield and the outer surface of the bearing support portion inserted in the penetrating sleeve.
Radiation from high dose areas is blocked. Further, direct radiation from the high radiation dose region is shielded by the inner side surface of the bearing support portion and the inner step formed on the outer side surface of the rotary shaft inserted into the bearing support portion. Further, the closing portion formed in the lower portion of the bearing support portion can close the gap between the bearing support portion and the through sleeve when the bearing support portion is pulled up.

By forming as described above, it is possible to shield the radiation from the high radiation dose range when performing maintenance and inspection of the rotary shaft and the bearing of the rotating machine, thus reducing the radiation exposure of the worker. be able to.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a rotary machine bearing support portion according to the present invention. Note that in FIG. 1, the same parts as those in FIG.

The rotary machine bearing support is composed of a shield 15 interposed between a high radiation dose region 30 and a low radiation dose region 31. A penetrating sleeve 18 is embedded through the shield 15. The rotary shaft 14 connected to the shaft of a rotary machine (not shown) installed in the low radiation dose region 31 is inserted into the through hole of the through sleeve 18. The intermediate portion of the rotary shaft 14 is a bearing 16
It is rotatably fixed by. The bearing 16 is supported in the bearing support portion 17. The bearing support 17 is inserted into the penetrating sleeve 18, is pressed from above by the bearing support pressing plate 21, and is fixed by the bearing support pressing bolt 19. The lower end of the rotary shaft 14 has a rotating device 1
Is attached via a shaft seal water seal 2.

An external step 11 is formed on the inner surface of the through sleeve 18 and the outer surface of the bearing support 17. An internal step 12 is formed on the inner surface of the bearing support 17 and the outer surface of the rotary shaft 14. Further, when the bearing support portion 17 is pulled up, the lower end of the bearing support portion 17 is extended so as to be below the lower end of the penetrating sleeve 18. Further, a closing portion 13 is formed at the lower end of the bearing supporting portion 17 so that the gap between the bearing supporting portion 17 and the penetrating sleeve 18 can be closed from below. The outer diameter of this closing part 13 is
It is larger than the inner diameter of the penetrating sleeve 18. Next, the operation of this embodiment having such a configuration will be described. A normal operating state will be described with reference to FIG.

The shield 15 provided between the high radiation dose region 30 and the low radiation dose region 31 shields the radiation from the high radiation dose region 30. The penetration sleeve 18 and the bearing are formed by the inner surface of the penetration sleeve 18 formed through the shield 15 and the outer step 11 formed on the outer surface of the bearing support 17 inserted into the penetration sleeve 18. Radiation from the high radiation dose region 30 passing through the gap with the support portion 17 is blocked. Further, an internal step 12 formed on the inner surface of the bearing support 17 and the outer surface of the rotary shaft 14 inserted in the bearing support 17
Thus, the radiation from the high radiation dose region 30 is shielded.

For maintenance and inspection of the rotating machine, see FIGS.
Will be described. FIG. 2 shows a state where the rotating machine bearing support portion is pulled up to the low radiation dose region 31. FIG. 3 shows the inspection state of the pulled up rotor bearing support.

As shown in FIG. 2, a bearing support holding bolt
Remove 19 and pull up the rotating machine bearing support together with the rotating shaft 14. Even in this pulled-up state, the lower part of the bearing support 17 is
The closing portion 13 extending toward the high radiation dose region 30 and located at the lower end of the bearing support 17 is larger than the inner diameter of the through sleeve 18. Therefore, the direct radiation from the high radiation dose region 30 is shielded through the gap between the through sleeve 18 and the bearing support portion 17, and the radiation exposure of the worker in the low radiation dose region 31 can be significantly reduced. An inspection method of the rotating machine bearing support portion will be described with reference to FIG.

The bearing support 17 which is pulled up together with the rotary shaft 14 is fixed by the bearing support fixed base 20. The bearing support pressing plate 21 is removed from the bearing support 17, and the rotary shaft 14 is further pulled up and fixed by the rotary shaft fixed base 22. The large diameter portion 14a of the rotary shaft 14 on the high radiation dose region 30 side is formed to be larger than the inner diameter of the bearing support portion 17. Therefore, when the rotary shaft 14 is pulled up, the large diameter portion 14a closes the through hole at the lower end of the bearing support portion 17, and the direct radiation in the high radiation dose region 30 is in the low radiation dose region.
Entry into 31 is greatly reduced. The rotary shaft connecting portion (driven side) 23 and the rotary shaft connecting portion (driving side) 24 are removed, and the bearing support pressing plate 21 and the bearing 16 are replaced and inspected. The restoration procedure is the reverse of the disassembly procedure.

As described above, according to this embodiment, the maintenance and inspection of the rotating shaft and the bearing of the equipment to be rotated provided in the high radiation dose region can be performed.
It can be performed in a low radiation dose region through the shield, and radiation exposure can be significantly reduced. In addition, it is possible to avoid the work associated with the temporary radiation exposure due to the attachment of the temporary shield, so that it is possible to shorten the work time for maintenance and inspection and significantly reduce the exposure of the employee.

[0022]

As described above, according to the rotary machine bearing support portion of the present invention, the rotary shafts and the bearings, which particularly need to be inspected, of the rotary equipment provided in the high radiation dose range are shielded. Through this, maintenance inspections can be performed in a low radiation dose region, so that the radiation exposure of employees can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotary machine bearing support portion according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a pulled-up state of the rotary machine bearing support portion shown in FIG.

FIG. 3 is a vertical cross-sectional view showing an inspection state of the rotary machine bearing support portion shown in FIG.

FIG. 4 is a vertical cross-sectional view of a conventional rotary machine bearing support portion.

5 is a vertical cross-sectional view showing a pulled-up state of the rotary machine bearing support portion shown in FIG. 4;

[Explanation of symbols]

 11 ... External step 12 ... Internal step 13 ... Closing part 14 ... Rotating shaft 15 ... Shield 16 ... Bearing 17 ... Bearing support 18 ... Through sleeve 30 ... High radiation dose range 31 ... Low radiation dose range

Claims (1)

[Claims] 1. A shield interposed between a high radiation dose region and a low radiation dose region, a through sleeve penetrating the shield and forming a through hole therein, and a rotation inserted into the through sleeve. A rotary shaft bearing connected to a shaft of a machine, a bearing rotatably fixed to the rotary shaft, and a bearing support part inserted into the through sleeve to support the bearing, An outer step is formed between the inner surface of the sleeve and the outer surface of the bearing support portion, and an inner step is formed between the inner surface of the bearing support portion and the outer surface of the rotating shaft. The bearing support portion and the through sleeve are pulled up when the bearing support portion is pulled up. A bearing supporting portion for a rotating machine, wherein a closing portion capable of closing a gap between the bearing supporting portion and the bearing supporting portion is formed below the bearing supporting portion.