JPH0572380A - Cleansing of internal pump - Google Patents

Abstract

(57) [Summary] [Object] The present invention is intended to automate the cleaning of a pump motor, to improve the efficiency of the cleaning work, and to reduce the labor of the inspection work of the internal pump. There is. [Structure] A support body 31 having wheels 42 and free to move, and a water tank 32 fixed on the support body 31 and capable of accommodating a pump motor 5 are provided, and the pump motor 5 is mounted in the water tank 32. Means 61A, 61B, pump motor rotating means 33 for rotating the mounted pump motor 5, and water tank 3
First cleaning means 34 for moving the brush part 71 back and forth into the shaft hole 5A of the pump motor 5 mounted inside
Cleaning nozzle 80 detachably attached in the water tank 32
And a cleaning liquid supply / discharge device 81 capable of supplying the cleaning liquid to the cleaning nozzle 80 and discharging the cleaning liquid in the water tank 32 to maintain it at a predetermined water level. The cleaning liquid is jetted to the pump motor 5 for cleaning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning device for an internal pump of an improved boiling water reactor, and more particularly to a cleaning device for a pump motor mounted inside the internal pump.

[0002]

2. Description of the Related Art Generally, a plurality of internal pumps, which are recirculation pumps in a nuclear reactor provided in an improved boiling water reactor, are installed below a reactor pressure vessel at circumferential intervals. The internal pump is a pump motor as a water immersion motor housed in the pump casing,
A pump impeller driven by the pump motor via a pump shaft and a diffuser accommodating the pump impeller.

The pump casing is fixed to a stub tube integrally formed in the lower part of the reactor pressure vessel and is supported in a suspended state. The diffuser is located between the reactor pressure vessel and the shroud, and the boss is attached to the stub tube opening. Then, the stretch tube is inserted into the inside of the pump casing from the boss portion of the diffuser.

A pump impeller is attached to the upper end of the pump shaft, the lower end is inserted from a stretch tube into the shaft hole of the pump motor, and the pump impeller is housed in the diffuser.

In the internal pump configured as described above, when the pump motor is driven, the pump impeller is rotationally driven via the pump shaft, and the coolant (reactor water) in the reactor pressure vessel is diffused from the downcomer section. Through the shroud to forcibly circulate the coolant (reactor water) in the reactor pressure vessel.

By the way, the pump motor comprises a stator and a rotor, each of which is covered with a can to protect the inside. The pump motor is operated by being shielded from the coolant (reactor water) of the reactor pressure vessel and immersed in fresh water filled in the pump casing.

However, when the pump motor is operated for a long period of time, scales and aged products adhere to it even in clear water, so that the inspection work can only be performed after cleaning. For this reason, it is necessary to disassemble the internal pump at the time of periodic inspection, etc. to perform cleaning, inspection, and repair. In particular, when cleaning the pump motor, the pump motor is taken out of the pump casing, transported to a repair room, and manually cleaned to remove water stains.

[0008]

In the prior art, when cleaning the pump motor, the scale was manually wiped off, so that the cleaning operation was very troublesome. Further, since the pump motor has its own weight of several tons, careful handling is required, and there is a problem that work efficiency is reduced.

The present invention has been made in consideration of the above-mentioned circumstances. The cleaning of the pump motor can be automated, the efficiency of the cleaning work can be improved, and the labor of the inspection work of the internal pump can be saved. An object of the present invention is to provide a cleaning device for an internal pump that can be used.

[0010]

In order to solve the above-mentioned problems, a cleaning device for an internal pump according to the present invention has a support body having wheels and free movement, and a pump fixed to the support body. A water tank capable of accommodating a motor, means for mounting the pump motor in the water tank, pump motor rotating means for rotating the mounted pump motor, and a shaft of the pump motor mounted in the water tank. First cleaning means for moving the brush part back and forth into the hole for cleaning, second cleaning means having a cleaning nozzle detachably mounted in the water tank, and supplying cleaning liquid to the cleaning nozzle. A cleaning liquid supply / discharge device capable of discharging the cleaning liquid in the water tank and holding it at a predetermined water level is provided, and the cleaning liquid is ejected from the cleaning nozzle to the pump motor for cleaning.

[0011]

In the cleaning apparatus for an internal pump according to the present invention, a pump motor is housed in a water tank fixed on a movable support having wheels and mounted on a mounting means, and pump motor rotating means. The pump motor is rotated by means of the first cleaning means, the brush portion is inserted into the shaft hole of the pump motor so as to move forward and backward, and the inner peripheral surface of the pump motor shaft hole is brushed for cleaning. By the cleaning means jetting the cleaning liquid from the cleaning nozzle to the pump motor for cleaning, the cleaning of the pump motor is automatically performed, while the cleaning liquid in the water tank can be discharged and maintained at a predetermined water level.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an internal pump cleaning apparatus according to the present invention will be described below with reference to FIGS.

FIG. 1 is a vertical sectional view showing an example of an internal pump in which a pump motor is housed, FIG. 2 is a vertical sectional view of a cleaning apparatus for an internal pump according to the present invention, and FIG. 3 is FIG.
FIG. 4 is a plan view of the main part of FIG. 2 along the line III-III of FIG.

In the improved boiling water reactor, as shown in FIG. 1, a plurality of internal pumps 2 as internal reactor recirculation pumps are arranged below the reactor pressure vessel 1 at circumferential intervals. Coolant (reactor water) installed in the reactor pressure vessel 1
Is guided from the downcomer section to below the shroud 3 to forcibly circulate the coolant (reactor water) in the reactor pressure vessel 1.

As shown in FIG. 1, the internal pump 2 includes a pump motor 5 housed in an enlarged diameter portion 4A of a pump casing 4, and a pump impeller driven by the pump motor 5 via a pump shaft 6. 7 and a diffuser 8 for accommodating the pump impeller 7.

The reduced diameter portion 4B of the pump casing 4 is fixed to a stub tube 9 formed in the lower portion of the reactor pressure vessel 1 by welding or the like, and is supported in a suspended state. The diffuser 8 is arranged between the reactor pressure vessel 1 and the shroud 3, and the boss portion 10 is attached to the opening portion of the stub tube 9. Then, the stretch tube 11 is inserted into the pump casing 4 from the boss portion 10 of the diffuser 8.

A pump motor 5 is housed inside the pump casing 4 through a pump side opening 4C, and is closed by a motor cover 12. A pump impeller 7 is attached to the upper end of the pump shaft 6, the lower end is inserted from the stretch tube 11 into the shaft hole 5A of the pump motor 5, and the pump impeller 7 is housed in the diffuser 8.

The internal pump 2 is liquid-tightly sealed by the pump shaft 6 and the stretch tube 11, and the coolant (reactor water) in the reactor pressure vessel 1 expands the diameter of the pump casing 4 which houses the pump motor 5. It is designed so as not to enter the portion 4A.

A cooling water introducing pipe 13 is provided at a shoulder portion 4D between the expanded diameter portion 4A and the reduced diameter portion 4B of the pump casing 4, and cooling water (fresh water) is introduced into the expanded diameter portion 4A from the outside. To do. The pump motor 5 is driven by being immersed in cooling water (clean water) in the expanded diameter portion 4A. Reference numeral 14 is a cooling water discharge pipe.

The internal pump 2 has a pump motor 5
To drive the pump impeller 7 via the pump shaft 6.
By rotating the reactor, the coolant (reactor water) in the reactor pressure vessel 1 is guided from the downcomer portion to below the shroud 3 through the diffuser 8, and the coolant (reactor water) is supplied in the reactor pressure vessel 1. Force circulation.

The pump motor 5 as a water immersion motor is
The stator and the rotor are composed of a stator side can 20A and a rotor side can 2 respectively.
The inside is protected by being covered with 1A (see FIG. 2).

During inspection work, the pump motor 5 closes the opening of the pump casing 4 on the pump impeller 7 side, discharges cooling water (clean water) from the inside of the pump casing 4, and then removes the motor cover 12. It is taken out.

By the way, as shown in FIG. 2, the cleaning device 30 for the internal pump comprises a support 31, a water tank 32, a pump motor rotating means 33, a first cleaning means 34 and a second cleaning means 35. ..

The support 31 includes a frame 40 and a support 4
1A and 41B, and the wheels 4 are provided at the bottom of the frame 40.
2 is attached.

As shown in FIGS. 5 and 6, the wheel 42 is provided with a bearing 44 on a seat plate 43, and a pin 45 as an axle is axially supported by the bearing 44 through the wheel 42. In addition, a spacer 46 is interposed between the wheel 42 and the bearing 44 as a spacing piece to maintain the spacing so that the wheel 42 and the bearing 44 do not come into contact with each other.

A water tank 32 is fixed to the upper portion of the frame 40, as shown in FIG. The water tank 32 is composed of a bottom plate 50 and side plates 51, 52, 53, 54 standing on four sides of the bottom plate 50.
It is formed by and. A lid 5 is provided at the upper opening of the water tank 32.
5 is removably attached to seal the aquarium 32. As shown in FIGS. 3 and 4, hanging ears 52A, 52B, 54A, 54B are provided on the outer upper portions of the side plates 52, 54.
Is provided. Hanging ears 52A, 52B, 54A, 54B
Not only can the water tank 32 be lifted, but the entire apparatus can be lifted when the water tank 32 is fixed to the frame 40.

As shown in FIG. 2, a suspension plate 56 is fixed to the upper portion of the lid 55, and a locking hole 56A is formed therein. Further, the lid 55 is provided with a vent tube 57, and the lid 5
When 5 is attached to the water tank 32, the inside of the water tank 32 communicates with the outside atmosphere side. A positioner 58 is attached to the inside of the side plate 51 of the water tank 32, and positions the pump motor 5 when the pump motor 5 is housed in the water tank 32. A water level gauge 59 is provided on the side plate 51 of the water tank 32 so that the water level of the wash water introduced into the water tank 32 can be visually confirmed from the outside.

The pump motor rotating means 33 provided in the lower portion of the water tank 32 comprises roller groups 61 and 62 and a roller drive motor 65 for rotating one roller group 61 from the outside of the water tank 32. Each roller group 61, 62 includes two rollers 61A, 61B and two rollers 62A, 6B, respectively.
It consists of 2B.

As shown in FIGS. 2 and 4, brackets 65A and 65B having an L-shaped cross section are fixed to the bottom plate 50 in parallel with each other at a predetermined interval. Each bracket 65A, 6
Bearings 66A and 66B are provided on the side plate 51 side of 5B so as to penetrate the side plate 51, respectively. One bracket 65
A roller drive shaft 64 is rotatably mounted on A and the bearing 66A, and a roller shaft 63 is rotatably mounted on the other bracket 65B and the bearing 66B.

The roller drive shaft 64 has one roller group 6
1 is rotatably attached to the shaft.

One end of the roller drive shaft 64 is the bracket 6
5A is pivotally supported and the other end penetrates the bearing 66A and is coupled to the roller drive motor 65 via the coupling 67. Therefore, one roller group 61 rotates integrally with the roller drive shaft 64 when the roller drive motor 65 is driven.

On the roller shaft 63, the other roller group 62 is integrally rotatably mounted. The roller shaft 63 is rotatably supported by a bracket 65B and a bearing 66B.

Roller 6 constituting each roller group 61, 62
1A, 61B, 62A and 62B are arranged so that the stator side can 20A of the pump motor 5 can be mounted.

Therefore, the pump motor rotating means 33 is
The pump motor 5 has rollers 61A, 61B, 62A, 62
When it is placed on B and the roller drive motor 65 is driven, one roller group 61 is rotationally driven via the roller drive shaft 64 to give a rotational force to the pump motor 5, and as the pump motor 5 rotates. , The other roller group 62 is driven.

The first cleaning means 34 comprises a cylinder 70 and a brush portion 71.

As shown in FIG. 2, one end of the cylinder 70 penetrates the side plate 53, and the flange 70A is attached to the outside of the side plate 53 by a bolt. The cylinder 70 is supported by the frame 40 by supports 41A and 41B.

A cylinder chamber 73 is formed in the cylinder 70, and a piston 72 is slidably fitted therein. The cylinder chamber 73 is configured by the piston 72 so that both pressure chambers 73A, 73A
B is defined. Supply and discharge passages 74A and 74B are connected to the pressure chambers 73A and 73B, respectively. Each pressure chamber 73
A and 73B are connected to the pressure fluid control device 79 via supply and discharge passages 74A and 74B. Pressure fluid control device 79
Controls the supply and discharge of the pressure fluid to and from the pressure chambers 73A and 73B,
Either one of the pressure chambers 73A and 73B is changed to a high pressure and the other is changed to a negative pressure to reciprocate the piston 72.

A brush portion 71 is connected to the piston 72. The brush portion 71 has a brush shaft 75 and a brush 76 formed on the tip diameter increasing portion of the brush shaft 75. As the brush 76, a brush made of nylon or the like is implanted.

In the brush portion 71, the piston 72 has the water tank 32.
When it moves to the side (left side in FIG. 2) and the brush 76 at the tip projects into the water tank 32, it is arranged so that it can be inserted into the shaft hole 5A of the pump motor 5 mounted on the roller groups 61 and 62. ..
The brush portion 71 is inserted into the shaft hole 5A of the pump motor 5 with the reciprocating movement of the piston 72, and moves back and forth.
6 slides on the inner peripheral surface of the rotor side can 21A of the shaft hole 5A and is brushed. Brush part 71
When the piston 72 retracts (to the right in FIG. 2) and the brush shaft 75 retracts, the rear end of the brush shaft 75 moves to the cylinder 70.
Exposed from.

A brush portion accommodating hole 77 is formed in the cylinder 70 on the water tank 32 side, and the brush 76 and the brush shaft 75 are provided.
Is housed inside. The brush portion accommodation hole 77 is provided in the breathing tube 78.
It is connected to the upper part of the water tank 32 via. The breathing tube 78
During operation of the brush portion 71, the air remaining in the brush portion accommodation hole 77 communicates with the upper portion of the water tank 32 and is discharged.

The second cleaning means 35 comprises a cleaning nozzle 80 and a cleaning liquid supply / discharge device 81.

A large number of cleaning nozzles 80 are connected to the common tube 82. Nozzle port 8 of the cleaning nozzle 80
0A is directed in multiple directions toward the entire upper outer periphery of the pump motor 5. The common tube 82 is located in the upper part of the water tank 32 and substantially in the center of the roller groups 61 and 62, and is detachably attached.

One end of the common tube 82 is closed and the other end is connected to the water supply connection fitting 83. The water supply connection fitting 83 is provided so as to penetrate the side plate 53. Also, the side plate 5
A drainage fitting 84 is provided at the bottom of 3.

The cleaning liquid supply / drainage device 81 includes hoses 83A, 8
Connection fitting 83 for water supply and connection fitting 84 for drainage via 4A
And communicate with each. The cleaning liquid supply / drainage device 81 sends the cleaning liquid to the cleaning nozzle 80 via the hose 83A, the water supply connecting fitting 83 and the common tube 82, and discharges the cleaning liquid in the water tank 32 via the drain connecting fitting 84 and the hose 84A. And circulate.

Then, the cleaning liquid supply / discharge device 81 keeps the water level of the cleaning liquid introduced into the water tank 32 during cleaning of the pump motor 5 constant. At the time of cleaning, the water level in the water tank 32 is set while checking the water level gauge 59 so that about 80% of the pump motor is immersed in the cleaning liquid so that the upper part of the pump motor 5 is exposed.

Therefore, when the cleaning liquid is supplied from the cleaning liquid supplying / discharging device 81 when the pump motor 5 is mounted on the roller groups 61 and 62 and cleaning is carried out, the cleaning nozzle 80 can move to the stator side of the pump motor 5. The cleaning liquid is spouted toward 20A.

Next, a cleaning device 30 for the internal pump
The action of will be described.

First, the lid 55 and the common tube 82 are removed from the water tank 32, the pump motor 5 taken out from the internal pump 2 is suspended in the water tank 32, and the positioner 58 guides the pump motor 5 to guide the rollers 61A, Place on 61B, 62A and 62B.

Next, the common tube 82 is attached to the water tank 32 with a bolt or the like, and it is confirmed whether the pump motor 5 is placed at a predetermined position.

The hoses 83A and 84A are connected to the cleaning liquid supply / discharge device 8
1, the pressure fluid control device 79 and the supply / discharge passage 74A,
74B is connected. Then, the pressure fluid control device 79 introduces a high pressure fluid into the pressure chamber 73A to operate the piston 72 and insert the brush portion 71 into the shaft hole 5A of the pump motor 5.

Next, a predetermined amount of cleaning liquid adjusted in advance is supplied from the cleaning liquid supply / discharge device 81 into the water tank 32, and the water level meter 59
After visually confirming the water level with, the lid 55 is attached to the water tank 32, and the upper portion of the water tank 32 is closed to complete the preparation for cleaning (see FIG. 2). At this time, regardless of the cleaning liquid supply device 81, after introducing the cleaning liquid from the upper part of the water tank 32, the lid 55
May be attached.

Then, the cleaning liquid supply / discharge device 81 delivers the cleaning liquid to the cleaning nozzle 80, and jets the cleaning liquid to the stator-side can 20A on the liquid surface. Stator side can 20A
When it is confirmed that the cleaning liquid hits the roller drive motor 65, the roller drive motor 65 is driven to rotationally drive the roller group 61 via the roller drive shaft 64, and the pump motor 5 drives the roller 61.
Rotate on A, 61B, 62A, 62B. Therefore, the stator side can 20 </ b> A of the pump motor 5 is cleaned by spraying the cleaning liquid over the entire portion of the water tank 32 exposed from the cleaning liquid from the cleaning nozzle 80.

Further, the pressure fluid control device 79 controls the supply and discharge of the pressure fluid to and from the pressure chambers 73A and 73B, and changes one of the pressure chambers 73A and 73B to a high pressure and the other to a negative pressure so that the pistons 72 to reciprocate, and brush portion 71
Is moved back and forth within the shaft hole 5A of the pump motor 5. Therefore, the brush 76 of the brush portion 71 slides on the inner peripheral surface of the rotor side can 21A of the shaft hole 5A and brushes it to clean the rotor side can 21A. At this time, the air remaining in the brush accommodating hole 77 is discharged to the upper part of the water tank 32 through the breathing pipe 78.

As described above, the cleaning device 30 for the internal pump has the rollers 61A, 61B, 62 in the water tank 32.
The pump motor 5 is placed on A and 62B and rotated, and the inner surface of the pump motor 5 is brushed and cleaned by the first cleaning means 34, and the pump motor 5 is cleaned by the second cleaning means 35. The rotor side can 21A and the stator side can 20A of No. 5 can be cleaned, and the entire pump motor 5 can be cleaned automatically at the same time.

[0055]

As described above, the cleaning apparatus for an internal pump according to the present invention is provided with a support body having wheels and a movable body, and a water tank fixed on the support body and capable of accommodating a pump motor. And a means for mounting the pump motor in the water tank, a pump motor rotating means for rotating the mounted pump motor, and a brush part that moves back and forth in the shaft hole of the pump motor mounted in the water tank. A first cleaning means for moving and cleaning, a second cleaning means having a cleaning nozzle detachably mounted in the water tank, a cleaning solution is supplied to the cleaning nozzle, and the cleaning solution in the water tank is discharged to a predetermined level. It has a cleaning liquid supply / drainage device that can hold at the water level of, and the cleaning of the pump motor can be performed automatically by ejecting the cleaning liquid from the cleaning nozzle to the pump motor, thus improving the efficiency of cleaning work. To Rukoto can, can thus improve the labor-saving of the inspection work of the internal pump.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an example of an internal pump that accommodates a pump motor.

FIG. 2 is a vertical cross-sectional view of a cleaning device for an internal pump according to the present invention.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a plan view of a main part of FIG.

5 is a partially cutaway side view showing the wheel of FIG.

6 is a front view of FIG.

FIG. 7 is a plan view of the seat plate of FIG.

FIG. 8 is a view taken along the line VIII-VIII in FIG.

[Explanation of symbols]

 5 Pump Motor 5A Shaft Hole 21A Rotor Side Can (Shaft Hole Inner Surface) 31 Support 32 Water Tank 33 Pump Motor Rotating Means 34 First Washing Means 35 Second Washing Means 42 Wheels 53 Side Plates (Side) 61A, 61B Roller 71 Brush portion 80 Cleaning nozzle 81 Cleaning liquid supply / discharge device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Watanabe 4-7-7 Shiba, Minato-ku, Tokyo Aitel Technical Service Co., Ltd.

Claims (1)

[Claims] 1. A means for mounting a pump motor in the water tank, comprising: a support body having wheels and freely moving; and a water tank fixed on the support body and capable of accommodating the pump motor. Pump motor rotating means for rotating the pump motor, first cleaning means for moving the brush part into and out of the shaft hole of the pump motor mounted in the water tank for cleaning, and detachable in the water tank A second cleaning means having a cleaning nozzle attached to the cleaning nozzle; and a cleaning liquid supply / discharge device capable of supplying the cleaning liquid to the cleaning nozzle and discharging the cleaning liquid in the water tank to maintain it at a predetermined water level. A cleaning device for an internal pump, characterized in that cleaning liquid is jetted from the cleaning nozzle to the pump motor for cleaning.