JP2997591B2 - Motor assembly tool for internal pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal pump motor assembling tool for assembling a motor of an internal pump used in an improved boiling water reactor (hereinafter referred to as ABWR) with a shaft.

[0002]

2. Description of the Related Art An ABWR has a structure as shown in FIG. That is, the main steam nozzle 2 is connected to the upper side wall of the reactor pressure vessel 1, and the main steam nozzle 2 is connected to a turbine (not shown). A water supply pipe 3 is connected to a side wall of the reactor pressure vessel 1 below the main steam nozzle 2, and a sparger 4 is connected to the water supply pipe 3. The sparger 4 is cooled in the reactor pressure vessel 1. Spray water.

[0003] A reactor core 20 having a group of fuels is arranged in the reactor pressure vessel 1, and a shroud 7 is provided around the reactor core 20. A separator 5 and a dryer 6 are sequentially provided above the head of the shroud 7 to separate steam and moisture of the cooling water heated in the reactor core 20, and the steam is dried and sent to the turbine through the main steam nozzle 2. Ten to twelve internal pumps 8 are equally mounted on the lower mirror 10 of the reactor pressure vessel 1.

[0004] The internal pump 8 is a reactor pressure vessel 1
Is located below the downcomer between the side wall of the vehicle and the shroud 7. The CRD housing 9 is attached to the lower mirror 10. The internal pump 8 is configured as shown in FIG. 7, and includes a stub tube 10a of the lower mirror 10 of the reactor pressure vessel 1.
It is attached to.

That is, the small diameter portion of the casing 15 of the internal pump 8 is welded to the stub tube 10a. The diffuser 12 is located above the stub tube 10a.
Are arranged, and a propeller 13 is inserted into the diffuser 12. The propeller 13 is attached to a tip of a shaft 14, and the shaft 14 is connected to an inner cylinder 19 of the motor 16. In FIG. 7, reference numeral 12a denotes a stretch tube, 17
Denotes a motor cover, 58 denotes a tightening nut, 32 denotes a key, 63 denotes a secondary seal, 48 denotes a casing flange, and 59 denotes a small flange.

The motor 16 is configured as shown in FIG. That is, the rotor 16a is attached to the outside of the inner cylinder 19, and the stator 16b is attached to the inside of the outer cylinder 30 so as to face the rotor 16a. An inner cylinder flange 60 is connected to a lower end of the inner cylinder 19. The lower end opening of the casing 15 is closed with a motor cover 17 by being fastened by a stud 29.

As described above, the ABWR uses the internal pump 8 for the purpose of reducing the risk of water leakage outside the reactor pressure vessel 1, and accommodates the motor 16 in a casing 15 projecting outside the lower mirror 10. The propeller 13 is rotated by the motor 16 to forcibly supply water to flow cooling water into the core 20.

However, it is strictly prohibited that the cooling water in the reactor pressure vessel 1 penetrates into the casing 15 through the stub tube 10a. Therefore, the inspection, disassembly, assembly sequence, and the like must be performed carefully so as not to make a mistake. Is needed.

[0009]

When assembling the motor 16, a work sequence must be established and properly performed to prevent the cooling water in the reactor pressure vessel 1 from entering the casing 15. . For example, at the time of assembling, the casing 15 is filled with fresh water, the diffuser 12 and the stretch tube 12a are mounted on the stub tube 10a, and sealing is performed at the contact surface between the upper surface of the stub tube 10a and the bottom surface of the diffuser 12.

[0010] Here, the tightening nut is used to stretch the tube.
When the 12a is not tightened, a blanking block is placed on the upper surface of the stretch tube 12a and temporarily sealed as an alternative function. That is, since the pressure of the cooling water is applied to the lower surface of the blanking block and the lower surface of the diffuser 12, temporary sealing can be performed.

Then, the fresh water in the casing is drained, and the stretch tube 12a is tightened with the tightening nut. Subsequently, the secondary seal 63 is attached. Next, when inserting the propeller 13 and the shaft 14, fresh water is injected again, the blanking block is removed, and the propeller 13 is inserted into the diffuser 12, and the shaft 14 is inserted into the stub tube 10 a with both being integrated.

An extension of the shaft 14 extends near the open end of the casing 15. This shaft when assembling the motor
If the key 14 and the keyway at the tip of the inner cylinder 19 of the motor do not match, the shaft 14 is pushed up. If the shaft 14 is temporarily pushed up, the contact portion of the secondary seal 63, which is a shaft seal, with the shaft moves, and cooling water enters.

For this reason, when the motor 16 is inserted, there is a problem that a setup must be made so that the key grooves match from the beginning.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In assembling a motor of an internal pump with a shaft, there is no permeation of cooling water in a reactor pressure vessel, and a safe, reliable and efficient work is performed. It is an object of the present invention to provide a motor assembly tool for an internal pump.

[0015]

SUMMARY OF THE INVENTION The present invention relates to a keyway formed in a lower end surface of a shaft extending into a casing of an internal pump and a keyway formed in a tip of an inner cylinder of a motor of the casing. And a jack portion for manually rotating the motor by pushing up an inner cylinder flange provided at a lower end portion of the inner cylinder after the key groove alignment by the position indicator portion. With
The position indicating unit includes a column, a key that fits into a key groove formed in a lower end surface of the shaft provided at an upper end of the column, and a cap that has an alignment mark attached to an outer peripheral surface of the column. A body covered with the cap and having an alignment mark by rotation, a boss having a handle detachably connected to a lower end of the body via a pipe, and an inner part attached to a lower portion of the boss. It consists of a key that fits into a keyway formed at the tip of the cylinder,
The jack portion is a collar abutting on a lower portion of the inner cylinder flange, a pedestal provided on the collar via a small-diameter thrust bearing, and a flange for mounting the pedestal.
And a jack bolt for pushing up the pedestal from the flange.

[0016]

In order to determine the relative position between the motor and the casing, a motor cover for the motor is provided on the two screw rods. The screw rod is fixed on the flange of the casing, and the rotation of the rod raises or lowers the motor cover. On the other hand, the rotor and the stator surrounded by the inner cylinder and the outer cylinder are compactly combined on the motor cover.

Further, a position indicating portion which is securely engaged with a key groove at an end portion of the inner cylinder fitted on the shaft is mounted thereon, and the inner cylinder of the motor is so rotated as to be freely rotatable by a handle of a boss of the position indicating portion. The flange is supported by a small-diameter thrust bearing. Along with this, the flange of the inner cylinder is lifted from the constantly used thrust bearing.

In this state, the screw rod is operated, and the tip of the inner cylinder approaches the inlet of the casing. Insert the key attached to the end of the column into the keyway at the end of the shaft, and turn the motor using the handle of the boss until the fit matches the scale. The motor rotates easily because it is supported by a small-diameter thrust bearing with a small frictional moment.

The stop position is determined by the scale of the position indicator. After that, the screw rod is lowered to remove the position indicating part, and then raised again to fit the inner cylinder and the shaft to perform the key lock. After that, the small-diameter thrust bearing is removed, and the small flange that is always used is attached to the motor cover again.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a motor assembly tool for an internal pump according to the present invention will be described with reference to FIGS. 1 to 3 show a position indicating portion I in the assembling tool of the present invention, FIG. 4 shows a jack portion J, and FIG. 5 shows a motor 16 in a casing 15 using the assembling tool of the present invention. 1 schematically shows a device incorporating the.

FIG. 1 (a) shows the main body of the position indicating unit I, and FIG. 1 (b) schematically shows a state in which a column of the main body is in contact with the shaft. FIG. 1 (a)
3 is a side view in the direction of arrows BB in FIG. 1A.

In FIG. 1A, reference numeral 57 denotes a cylindrical column, and a key mounting seat 62 is provided at the upper end of the column 57.
The key 61 is mounted on the upper surface of the key mounting seat 62.
Are fixed by screws. This key 61 is shown in FIG.
As shown in FIG. 6, the shaft is fitted into the key groove 31 of the shaft. The cap 38 is welded to the upper side surface of the column 57. The cap 38 is covered with a body 40 via a needle bearing 39.

A pipe 41 is connected to a lower end of the body 40, and a flange 42 is connected to a lower end of the pipe 41. A boss 43 is connected to the flange 42, and the boss 43
A key 33 is attached to a lower side surface of the key. The key 33 is fitted into a key groove 32a formed on the upper part of the inner cylinder 19. As shown in FIG. 2, three equally divided handles 44 are attached to the upper side surface of the boss 43.

FIG. 2 shows the side of the support 57 above the cap 38.
As shown in FIG. 3, three equally divided cylinders 34 are connected. Each cylinder 34 has a plug 35 and a spring 36
And a spindle 37. As shown in FIG. 3, positioning marks M are provided on the cap 38 and the body 40, respectively.

On the other hand, as shown in FIG. 4, a jack J is inserted into a recess at the center of the lower surface of the inner cylinder flange 60 and abuts against the cylindrical collar 21, and a small-diameter thrust bearing 22 is attached to the lower inner surface of the collar 21. And a flange 24 on which the pedestal 23 is placed and which is fixed to the motor cover 17 with bolts 25. The flange 24 is provided with a jack bolt 26 for pushing up the pedestal 23. Thrust bearings on both upper and lower surfaces of inner cylinder flange 60
27 and 28 are provided.

Next, the relationship between the internal pump and its motor will be described. In FIG. 7, a stub tube 10a is inserted as a pump seat between the outer wall of the shroud 7 and the inner wall of the reactor pressure vessel 1, a plurality of peripheral parts are equally arranged, and a hole for passing the diffuser 12 is provided. Engaged and integrated diffuser 12
And the stretch tube 12a are inserted.

The inner wall of the reactor pressure vessel 1 and the contact surface between the shroud 7 and the outside of the diffuser 12 are sealed with a metal ring or the like. The propeller 13 is integrated with the shaft 14 and extends from inside the stretch tube 12a to inside the casing 15.

A packing is inserted between the lower surface of the diffuser 12 and the upper surface of the stub tube 10a, and the lower end of the stretch tube 12a engaging with the diffuser 12 is tightened between the casing 15 and the casing 15 with a tightening nut 58. Seal by increasing the tightening pressure on the surface. Support 11
Supports the shroud 7, but has a passage at the pump position, sucks in from the upper surface of the propeller 8,
The driving water discharged from the lower surface of the reactor 20 is fed between the fuel groups of the reactor core 20.

The key 32 is attached to the shaft 14 and fits in the key groove 32a of the inner cylinder 19 of the motor 16. The rod 18 is implanted at the shaft end and fastened to the flange 19a of the inner cylinder 19. The motor cover 17 is fastened to the casing flange 48 with studs 29. The small flange 59 is provided in the motor cover 17 and supports the needle bearing below the inner cylinder flange 60 by using the cylindrical portion of the small flange.

Instead of the small flange 59 shown in FIG. 8, the flange 24 is bolted to the bolt 25, and the pedestal 23 is jacked up with the jack bolt 26 to thereby provide a small-diameter thrust bearing on the pedestal 23.
As shown in FIG. 4, small gaps of .alpha. And .beta. Dimensions are provided by the thrust bearings 27 and 28 for supporting the inner cylinder 22 and pushing up the inner cylinder flange 60 via the collar 21. In this way, the motor weight via the inner cylinder flange 60 is supported by the small-diameter thrust bearing 22.

Since the small-diameter thrust bearing 22 has a smaller diameter than the existing thrust bearings 27 and 28, the effect of reducing the friction radius is produced. At the time of positioning, the motor is rotated by the handle 44 of the tool at the position support portion I shown in FIGS. The key 61 is provided at the upper end of the column 57, and the cap 38 is integrated with the column 57 by welding or the like.

A needle bearing 39 is provided on the body 40 within the cap 38. The body 40 is integrated with the flange 42 via a pipe 41 by welding or the like. Boss 43 is flange 42
And the lower end of the boss 43 is inserted into the inner cylinder 19 in the form of an inner cylinder and engages with the inner cylinder 19 via the key 33. handle
At 44, the power is transmitted from the boss 43 to the inner cylinder 19, and the motor is manually rotated.

As a result, when the scales of the body 40 and the cap 38 match, the position of the key groove 32a matches the position of the key 32 shown in FIG. 7 as shown in FIG. Keyway 31 at shaft 14 end
When the key 32 is fitted with the key 61, the position of the key 32 of the shaft 14 is determined in relation to the key groove 31, so that when the scale of the body 40 matches the scale of the cap 38, the key 32 of the shaft 14 and the inner cylinder 19 The positioning of the key groove 32a is completed (see FIG. 3). Since the rod 18 is implanted at the end of the shaft 14, this is used to hold the column 57 during rotation of the motor.

The spindle 37 is pressed by a spring 36 so that the spindle 37 is free to enter and exit using the inside of the cylinder 34 and the plug 35 as a guide. The spindle 37 is pushed on the rod 18 from three directions. Three handles 44 are arranged on the boss 43, and one upward key 61 is fixed to a key mounting seat 62 attached to the upper end of a column 57.

It is to be noted that the spindle 37 projects from the three sides into the support column 57. FIG. 5 shows the whole screw rod 49. That is, a casing flange 48 is provided at the open end of the casing 15, and two clamps 47 are formed in a diametrical direction of the outer periphery thereof.

A block 46 is provided in the clamp 47. The block 46 is fixed to the clamp 47, and two screw rods 49 are locked by the cap 45 via the block 46. The screw rod 49 rotates freely, for example, forms clamps 51 on both sides of the motor cover 17, attaches a block 52, and freely provides a female screw corresponding to the movement screw on the screw rod 49 in the block 52. When the rotation of the screw rod 49 is allowed, the motor cover 17 moves up.

That is, as shown in FIG. 8, when the motor 16 is combined with the motor cover 17, the motor 16 is inserted directly into the casing 15 by the screw rod 49.
In the table 55, there is a connecting mechanism of the first reduction gear 53 and the second reduction gear 56, and the connection operation is performed. The first reduction gear 53 side is the prime mover side, and the handle 54 is for manual operation.

Next, a method of assembling the motor into the internal pump will be described. After the internal pump is repaired, fresh water is sealed in the casing 15, the diffuser 12 and the stretch tube 12a are mounted, and a blanking block is loaded on the stretch tube in order to reassemble. Stretch tube 12 with fresh water and tightening nut
a is fixed, and the secondary seal 63 is mounted.

Then, fresh water is sealed again, the blanking block is removed, and the propeller 13 and the shaft 14 are inserted. The extended end of the shaft 14 extends to near the casing flange 48. Then, drain the fresh water and open the casing 15, and as shown in FIG.
Is engaged with the screw rod 49.

Thus, the boss 43 with the handle 44 and the column 57 with the key 61 are attached to the upper end of the inner cylinder 19 as shown in FIG. A flange 24 and a pedestal 23 are attached to the motor cover 17, and the inner cylinder flange 60 is mounted on the collar 21.
And apply a rod of its own weight to the small-diameter thrust bearing 22. In this case, the jacks are jacked up with the jack bolts 26 to float only a small gap from the thrust bearings 27 and 28 used during normal operation.

The motor on the motor cover 17 is driven by the reduction gears 53 and 56 shown in FIG.
Make the top straight up. Stop once near the casing flange 48, insert the key 61 into the key groove at the end of the shaft, turn the boss 43 with the handle 44 until it matches the scale of the cap, and turn the motor 16 from the inner cylinder 19 with the key 33 to the body 40. Until the mark M on the cap 38 matches.

After confirming the coincidence, the motor 16 together with the motor cover 17 is once lowered by the reverse rotation of the reduction gear 53 of the screw rod 49. The descent is stopped at an appropriate place, the boss 43 and the support column 57 are removed, the descent is continued, the motor is inserted into the casing, and the shaft 14 is fitted inside the inner cylinder 19, and the descent is continued directly above.

Eventually, the key groove 32a of the inner cylinder 19 is fitted into the key 32 of the shaft 14, and the upper surface of the motor cover 17 and the lower surface of the casing flange 48 come into contact with each other and stop. In this mounting, there is no danger of the shaft 14 being pushed up because the key 32 and the key groove 32a are smoothly matched.

Accordingly, the contact portion between the secondary seal and the shaft 14 does not move, and there is no worry about leak of reactor water. After the correct fitting of the inner cylinder 19 and the shaft 14, the flange 24 is removed from the motor cover 17 again and the small flange is removed.
Install 59. Then, finishing as shown in FIG.
Thereafter, a test run is performed to confirm that there is no abnormality, and reassembly is completed.

[0045]

According to the present invention, the key of the shaft is inevitably fitted into the key groove of the inner cylinder of the motor, so that the shaft which is suspended is not unduly pushed up. In addition, since the screw rod is directly above or below the position before and after the alignment, the accuracy of the adjusted position is high. Further, the internal pump can be easily repaired, and there is an effect that greatly helps to eliminate risks such as leakage of cooling water.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view showing a position support portion in one embodiment of a motor assembly tool for an internal pump according to the present invention, and FIG. 1B is a view in which a key of a support in FIG. The schematic diagram which shows the state which was inserted.

FIG. 2 is a top view as seen from the direction of arrows AA in FIG.

FIG. 3 is a side view as seen from the direction of arrows BB in FIG.

FIG. 4 is a longitudinal sectional view showing a jack portion of the assembling tool in FIG. 1 (a).

FIG. 5 is a schematic elevation view for explaining a state at the time of the assembly operation in FIG.

FIG. 6 is an elevational view schematically showing the inside of an ABWR type reactor pressure vessel in a partial cross section.

FIG. 7 is a longitudinal sectional view showing the internal pump in FIG. 6;

FIG. 8 is a longitudinal sectional view showing a motor unit in FIG. 7;

[Explanation of symbols]

1 ... reactor pressure vessel, 2 ... main steam nozzle, 3 ... water supply pipe,
4 sparger, 5 separator, 6 dryer, 7 shroud, 8 internal pump, 9 C
RD housing, 10 ... lower mirror, 10a ... stub tube, 11
... support, 12 ... diffuser, 12a ... stretch tube, 13 ... propeller, 14 ... shaft, 15 ... casing, 16 ... motor, 17 ... motor cover, 18 ... rod,
19 ... inner cylinder, 20 ... core, 21 ... collar, 22 ... small diameter thrust bearing, 23 ... pedestal, 24 ... flange, 25 ... bolt, 26 ...
Jack bolt, 28 thrust bearing, 29 stud, 30 outer cylinder, 31 keyway, 32 key (of shaft),
33… Key (of boss), 34… Cylinder, 35… Plug, 36
... Spring, 37 ... Spindle, 38 ... Cap, 39 ... Needle bearing, 40 ... Body, 41 ... Pipe, 42 ... Flange,
43 boss, 44 handle, 45 cap, 46 block, 47 clamp, 48 casing flange, 49 screw rod, 51 clamp, 52 block, 53 reducer, 54 handle, 55 table , 56 ... reducer, 57 ... column, 58 ... tightening nut, 59 ... small flange, 60 ... inner cylinder flange, 61 ... key, 62 ... key mounting seat, 63 ... secondary seal.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shigeru Watanabe 4-7-7 Shiba, Minato-ku, Tokyo Inside Aitel Technical Service Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) G21C 19/02 G21C 15/243

Claims (1)

(57) [Claims] 1. A key groove formed at a lower end surface of a shaft extending into a casing of an internal pump and a key groove formed at a tip of an inner cylinder of a motor of the casing. A position indicator, and a jack for manually rotating the motor by pushing up an inner cylinder flange provided at a lower end portion of the inner cylinder after the key grooves are aligned by the position indicator. The part is a column, a key that fits into a key groove formed on the lower end surface of the shaft provided at the upper end of the column, and a cap that has an alignment mark attached to the outer peripheral surface of the column,
A body covered with the cap and having an alignment mark by rotation, a boss having a handle detachably connected to a lower end of the body via a pipe, and the inner cylinder attached to a lower portion of the boss A key that fits into a key groove formed at the tip end, the jack part is a collar that abuts on a lower portion of the inner cylinder flange, and a pedestal is provided on the collar via a small-diameter thrust bearing.
A motor assembly tool for an internal pump, comprising: a flange on which the pedestal is mounted; and a jack bolt for pushing up the pedestal from the flange.