KR100285671B1 - Shaft aligning apparatus of reactor coolant pump - Google Patents

Abstract

PURPOSE: A shaft aligning apparatus of a reactor coolant pump is provided to accurately and readily measure shaft alignment of the reactor coolant pump. CONSTITUTION: A shaft aligning apparatus of a reactor coolant pump comprises a pair of bodies(30,30'), X direction drivers(60), Y-1 direction drivers(70), and Y-2 direction drivers(80). The bodies(30,30') have a hollow(31) are separated coupled at their regular positions by a positioning unit(40) and a coupling unit(50) at both sides of the hollow(31). The X direction drivers(60) are spaced from each other by 120° around the inner boundary of the hollow(31) and guide the X direction rotation of the bodies(30,30'). The Y-1 direction drivers(70) are spaced from each other by 120° between the X direction drivers(60) and prevent the upper part of the bodies from vibrating during X direction rotation. The Y-2 direction drivers(80) are allocated at the outer side of the bottom of the bodies(30,30') opposite to the Y-1 direction drivers(70) and prevent the bodies from moving up and down during rotation of the bodies(30,30').

Description

Axis Alignment Unit of Reactor Coolant Pump

The present invention relates to a reactor coolant pump, which is one of the main components of a nuclear power plant, and more particularly, to a reactor that allows the user to conveniently and accurately measure the shaft alignment of a motor shaft and a pump shaft of a reactor coolant pump. A shaft alignment device for a coolant pump.

In general, the reactor coolant pump is about 45 tons or more, and the weight is an outgoing body, and as shown in FIG. The shafts 11, 21 are connected to the couplings 12, 22 so as to co-rotate.

In such a coolant pump, a phenomenon in which the two shafts (motor and pump shafts 11 and 21) are misaligned due to the surrounding environment (temperature, etc.) and vibration during operation occurs.

If the alignment of the two axes is misaligned, it will hinder the safe operation of the main pump (the rise of the shaft vibration and the change of the related operating variables). Therefore, the alignment of the two axes should be checked regularly and corrected if necessary.

In general, the horizontal and vertical prescribed values that define the degree of misalignment (horizontal and vertical) of two axes are, in principle, within 0.001 inch for horizontal alignment and 0.002 inch for vertical alignment.

Conventionally, a forced rotation method of a motor is used to check the alignment of two shafts.

This method ends the centering of the motor and pump shafts 11 and 21, and then attaches the gauge to the motor coupling 12 and the pump coupling 22 in the vertical and horizontal directions (actually the spool piece (SP). ), And measure the deviation of the two axes by reading the scale of the dial gauge while slowly rotating the motor.

However, this measurement method cannot measure the alignment of two axes accurately with only one operation, so the same operation must be repeated several times, and the two axes must be aligned within the specified value based on the measured values. There was a drawback to having to rely on the manual work of the operator.

That is, each time the two axes are aligned, the operator calls the switchboard each time to start the oil lifting pump 110, and then forcibly forms an oil film on each bearing (upper and lower radial bearing and thrust bearing) of the motor 10. Then, two to three workers climb to the top of the motor, open the wheel cover 121 of the flywheel 120, fasten the dedicated wrench on the upper end of the motor shaft 11, and then displace the two axes through a dialogue with the measuring instrument. After confirming the amount, after the checking operation is completed, the dials are dialed again to align the two axes while stopping the starting of the motor oil lifting pump 110.

However, such a shaft alignment work requires a large number of people, and work for a long time is not only cumbersome and inconvenient, but also has the disadvantage of increasing the radiation exposure to the operator, and also the measured value due to the shaking of the oil lifting pump during alignment work There was a problem such as a drop in accuracy.

The present invention is to solve this problem, the technical problem is to provide a device that can accurately and conveniently measure the axial alignment of the coolant pump.

1 is a partially cutaway perspective view of a typical reactor coolant pump.

2 is an assembled plan view of the present invention.

3 is a front sectional view of the positioning means.

4 is an enlarged plan view of the fastening means.

5 is a cross-sectional view of the X-direction drive unit.

6 is a cross-sectional view of the Y-1 direction driving unit.

7 is an enlarged front view of the Y-2 direction driving unit.

8 is a schematic use state diagram of the present invention.

* Explanation of symbols for main parts of the drawings

10 motor 11 motor shaft

20: pump 21: pump shaft

30, 30 ': body 31: hollow part

40: positioning means 41: circular key

50: fastening means 51, 52: fixing bracket

53: Bolt 55: Nut

60: X direction drive part 61: roll

70: Y-1 direction drive part 71: roll

80: Y-2 direction drive 81: fixed pin

82: spring 83: stopper

85: pin bolt 86: roll

87: spacing 88: stopper pin

120: flywheel 121: wheel cover

130: spool piece

The apparatus of the present invention for achieving the above object has a hollow portion in which the motor shaft and the pump shaft are fitted in the center and a pair of bodies that are separated and coupled in position by positioning means and fastening means on the divided cutting surface; A plurality of X-direction driving parts provided at equal intervals in the hollow part of the body to guide the X-direction rotation of the body while being in elastic contact with the motor shaft and the pump shaft, and installed in the hollow part and the outer bottom part of the body, It consists of a Y-1 direction drive part and a Y-2 direction drive part to contact the top and bottom of the spool piece located in the Y to prevent the swing in the Y direction to guide the correct rotation in the X direction.

According to the present invention configured as described above, after the die gauge is attached to the body and the body is rotated at each measurement position, the alignment state of the motor shaft and the pump shaft is indicated by a scale so that accurate measurement is possible.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Prior to describing the present invention, terms used in the text are defined as follows.

X direction: It means a horizontal direction, ie, the direction orthogonal to the motor shaft 11 and the pump shaft 21.

Y direction: It refers to the vertical direction, ie the axial direction parallel to the motor shaft 11 and the pump shaft 21.

Y-1 direction: When the body 30, 30 'of the present invention rotates horizontally in the X direction from the upper end of the spool piece, it indicates the up and down swing direction, and is referred to as the Y-1 direction for the sake of convenience. Is in the same direction.

Y-2 direction: refers to the direction in which the body 30, 30 'of the present invention swings up and down at the lower end of the spool piece when it rotates horizontally in the X direction from the upper end of the spool piece, and is referred to as the Y-2 direction for convenience. It is substantially the same direction as the Y direction.

Horizontal alignment and vertical alignment: indicates the alignment state of the motor shaft 11 and the pump shaft 21 in the X and Y directions.

2 shows an assembly plan view of the present invention.

As shown, the shaft alignment device of the present invention has a hollow portion 31 into which the motor shaft 11 and the pump shaft 21 are fitted in the center of the divided surface, and the positioning means 40 provided on both sides of the hollow portion. And a pair of divided bodies 30 and 30 'which are separated and coupled in place by the fastening means 50;

The X direction of the body (30, 30 ') is installed on the inner periphery of the hollow portion 31 by a roll 61 and elastically rolling contact with the motor shaft 11 and the pump shaft 21 (120) A plurality of X-direction driving units 60 for guiding rotation;

The body 30, 30 ′ is installed in the X direction by being provided at 120 ° intervals between the X-direction driving units 60 of the hollow part 31 and rolling in contact with the upper end of the spool piece 130. A plurality of Y-1 direction driving units 70 for preventing the upper side of the body from shaking in the Y direction (vertical direction) when rotating;

The Y-1 direction drive part 70 is provided on the outer side of the bottom surface of the body located in line with the Y-1 direction drive part, and has a roll 86 that elastically contacts the bottom flange of the spool piece 130. A plurality of Y-2 direction driving units 80 to match the force in the Y direction during rotation of the bodies 30 and 30 'to prevent up and down flow; It consists of.

The pair of bodies 30, 30 is a clamp in which a circular body having a circumferential polygon is bisected, and a hollow portion 31 into which the motor shaft 11 and the pump shaft 21 are fitted is formed at the center, The recess 32 is formed integrally with the flange of the spool piece 130 as shown in the dotted line of FIG.

As shown in FIG. 3, the positioning means 40 is press-fitted into the upper and lower parts of the split surfaces of both bodies 30 and 30 'so that the circular key for positioning the body of the other side can be fastened to the correct position. 41 and a screw 42 for fastening the circular key to the body in order to prevent separation of the circular key.

The fastening means 50 includes two fixing brackets 51 and 52 fixed by welding to corresponding positions of the outer surfaces of the body 30 and 30 'with the divided surfaces therebetween as shown in FIG. The one side of the fixing bracket 51 is rotatably connected to the head through the hinge pin (54) and the other side of the bolt portion 53 passing through the fixing bracket 52 of the opposite side, and the fixing bracket 52 It consists of a nut 55 that is screwed to the bolt passing through the two bodies are firmly fastened in the correct position by fastening the nut.

The plurality of X-direction driving units 60 includes a roll 61 in rolling contact with the motor shaft 11 or the pump shaft 21 as shown in FIG. 5, and the body when the roll is in rolling contact with the motor shaft and the pump side. (30, 30 ') is prevented from flowing in the X direction, and each of the X direction driving units is provided on the inner surface of the body three at intervals of 120 degrees.

One of the rolls 61 is installed so as to be supported by the slider 62 under tension of the spring 63 so that the roll is always in close contact with the motor shaft and the pump side. It should be within / 100mm.

The plurality of Y-1 direction driving units 70 includes a roll 71 in contact with the upper end of the spool piece 130 as shown in FIG. 6, wherein the rolls are formed with the rolls 61 of the X direction driving unit 60. It is installed at intervals of 120 ° at intervals of °, and when the roll 71 rotates in contact with the top of the spool piece 130, the error in the Y direction to be within 1 / 100mm.

Body (30, 30 ') located on the outside of the roll 71 is formed with a plurality of inspection holes 33 for visually confirming whether the roll rotates in close contact with the top of the spool piece, these inspection holes It is formed at an angle of about 15 ° with the roll 71.

As shown in FIG. 7, the plurality of Y-2 direction driving units 80 are disposed at 120 ° intervals at a distance of 60 ° as in the Y-1 direction driving unit, and are aligned with the rolls of the Y-1 direction driving unit. Located in

The Y-2 direction driving part is vertically penetrating the body (30, 30 ') and protrudes to the bottom surface and is fastened with a fixing pin 81 which is coalesced together with the spring 82, and is fastened to the upper end of the fixing pin by a bolt 84 A spool piece inserted together with a stopper 83 supporting the upper end of the spring 82, a pin bolt 85 fastened to the lower end of the fixing pin in the X direction, and a spacer spacer 87 for adjusting the spacing on the pin bolt. Roll 86 is in contact with the lower flange of the cloud and the stopper pin 88 is inserted into the middle portion of the fixing pin and elastically in contact with the bottom of the body.

Referring to the operation and operation of the present invention configured as described above are as follows.

First of all, the apparatus of the present invention needs to be subjected to adequacy test to confirm whether the apparatus is properly manufactured and the accuracy of data before performing the demonstration test.

To this end, the inventors tested using a pre-made mockup.

The test method is to insert and fix the gauge of the dial gauge in the self-examination holes 34 and 35 of the body 30, 30 ', and then to rotate the body several times to determine the deviation (accuracy) of the data indicated at each designated position. Measured.

① Verification of verticality (Y direction deviation)

The test method is to install the newly manufactured device in the mock-up, install a dial gauge in the vertical inspection hole 35, rotate the body five or more times at each designated position, record the measured value, and compare the recorded deviation. It was.

The measuring position is set along the circumference and is set so that it does not overlap with each other at equal intervals, and the more the measuring position, the narrower the interval.

The measuring instrument was two dial indicators (1 / 1000mm) and the test results are shown in Table 1.

② Verification of horizontality (deviation in X direction)

In the test method, as in the verification of the verticality, after the newly manufactured device is installed in the mock-up, a dial gauge is installed in the horizontal inspection hole 34, the body is rotated five or more times at each designated position, and the measured value is recorded. The comparison was confirmed.

The measuring instrument was two dial indicators (1 / 1000mm) and the test results are shown in Table 2.

As the above test result data shows, the device of the present invention was very satisfactory.

Although the error of the device with respect to the reference plane was measured using the most accurate 1 / 1000mm grade dial indicator, the margin of error is the minimum "0" to the maximum "1/1000" mm for verticality (0.D). In the case of the horizontality, it is proved to be very precise because the deviation of the minimum "0" to the maximum "2/1000" is shown.

In addition, the result of the comparative test in which the gap between the couplings was measured by micrometer in the field of the reactor coolant pump installed in the ring No. 3, and the measurement of the apparatus of the present invention was again carried out. It was found that the measured value after the measurement and the measured value after the device of the present invention were attached were almost unchanged, so that the sophistication of the device was very excellent.

After verifying the vertical and horizontal degree of the device as described above, the field test was performed.

In the same way that the field test was performed, the equipment was directly tested with the field staff in October 1995 at the Kori-3 inspection site, the performance was checked, and the reaction of the practitioners was carefully observed.

The test method is a fastening means 50 for fastening the two shafts 30 and 30 'divided outside the motor shaft 11 or the pump shaft 21 exposed to the upper end of the spool piece 130 of the reactor coolant pump as shown in FIG. ) And the horizontal and vertical inspection holes 34 and 35 of the body are inserted and fixed horizontally and vertically, and then the scale of the dial gauge is read while slowly rotating the body. .

The gauge of the dial gauge inserted into the horizontal inspection hole 34 checks the flow state in the X direction while contacting the side surface of the upper flange integrated with the spool piece 130.

If the body flows in the X direction, there is a change in the scale of the dial gauge, which means that the two axes are displaced in the X direction.

Further, the gauge of the dial gauge inserted into the vertical inspection hole 35 checks the flow state in the Y direction while contacting the upper surface of the upper flange integrated with the spool piece 130.

If the body flows in the Y direction, there is a change in the scale of the dial gauge, which means that the two axes are displaced in the Y direction.

When the measurement test is completed, the die gauge is removed from the body, the fastening means are released to remove the body from the motor shaft and the pump shaft, and the removed device of the present invention is stored and reused.

Table 3 shows the results of such a test, and one vertical dial indicator (1/100 mm) and one horizontal dial indicator (1/100 mm) were used as the dial gauge.

The above test is the result of using a 1 / 100mm dial indicator, the value read through its own inspection hole when the device of the present invention rotates on the real of the spool piece is almost round since the machined surface of the spool is almost round. It is confirmed that the measurement value of is almost "zero", and the field practitioners also recognized that the device is very convenient and accurate.

Following this test, the alignment of three reactor coolant pumps in Gori 3 was conducted in 1995.

Comparing the present invention as described above with the conventional working method has the following effects.

First, in terms of working time, 12 hours of working time were conventionally required for one coolant reactor pump. However, using the apparatus of the present invention, only 6 hours are required, and the time required for work can be cut in half.

In addition, the input manpower required for the measurement work is also required in each case of the measurement and adjustment in the conventional case, but in the case of the present invention it can be seen that two people at the time of the adjustment is required in the adjustment of five people in the work surface.

In terms of accuracy, in the conventional case, the accuracy was maintained even while the data was slightly unstable by the oil lifting pump. However, in the case of the invention, the value is very accurate if only the precision of the device is maintained.

In addition, in terms of convenience, in the conventional case, there was an inconvenience in that the worker had to work by rotating the motor by hand after starting the oil lifting pump by calling the switchboard every time data measurement was performed, but in the case of the present invention, the spool device was used. It is very simple because the work is carried out simply by attaching it to the machine and rotating it, and it is convenient to check the adjusted state at any time during the adjustment.

Claims (4)

In the center of the divided surface has a hollow portion 31 into which the motor shaft 11 and the pump shaft 21 of the reactor coolant pump are fitted, and a recess 32 into which the upper flange of the spool piece 130 is inserted into the bottom thereof. The body on either side is formed with horizontal and vertical inspection holes 34 and 35 into which the gauge of the dial gauge is inserted, and is separated in position by the positioning means 40 and the fastening means 50 provided on both sides of the hollow part. A pair of divided bodies 30, 30 'coupled; Three are provided on the inner surface of the body at intervals of 120 ° and provided with rolls 61 which are in rolling contact with the motor shaft 11 or the pump shaft 21, and one of the rolls 61 has a spring. A plurality of X-direction driving units (60) installed so as to be supported by the slider (62) subjected to the tension force of (63) to always keep the roll in close contact with the motor shaft and the pump shaft; Rolls 71 are provided in rolling contact with the upper end of the spool piece 130, and the rolls are installed at intervals of 120 ° with a gap of 60 ° with the roll 61 of the X-direction drive part 60, A plurality of Y-1 direction driving units 70 for guiding rotation of the body in the Y direction; The Y-1 direction drive part 70 is provided on the outer side of the bottom surface of the body located in line with the Y-1 direction drive part, and has a roll 86 that elastically contacts the bottom flange of the spool piece 130. And a plurality of Y-2 direction driving units 80 for guiding rotation in the Y direction by matching the force in the Y direction when the bodies 30 and 30 'are rotated; Axial alignment device of the reactor coolant pump, characterized in that consisting of. The method of claim 1, wherein the positioning means 40 is press-fitted into each of the upper and lower parts of the split surface of both the body (30, 30 ') to determine the position so that the body of the other side can be fastened to the correct position when the body Circular key (41) and the shaft alignment device of the reactor coolant pump, characterized in that consisting of a screw (42) for fastening the circular key to the body in order to prevent the departure of the circular key. According to claim 1, The fastening means 50 is two fixing brackets (51, 52) fixed by welding at mutually corresponding positions on the outer surface of the body 30, 30 'between the divided surface between And, the head is connected to the fixing bracket 51 of the one side through the hinge pin (54) rotatably and the other side of the bolt 53 through the fixing bracket 52 of the opposite side, and the fixing bracket 52 A shaft alignment device of the reactor coolant pump, characterized in that consisting of a nut (55) screwed to the bolt through. According to claim 1, wherein the plurality of Y-2 direction drive unit 80 is installed in a line with the roll of the Y-1 direction drive unit vertically penetrates the body (30, 30 ') and is coalesced together with the spring 82 A fixing pin 81, a stopper 83 fastened to the upper end of the fixing piece by a bolt 84 to support the upper end of the spring 82, and a pin bolt 85 fastened to the lower end of the fixing piece in the X direction. And a roll 86 inserted into the pin bolt so as to be rotatable with the spacing 87 for adjusting the spacing, and a stopper pin 88 inserted into the middle portion of the fixing pin to elastically contact the bottom of the body. Axial alignment device for a reactor coolant pump.

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