Rotor centering measurement method, rotor alignment adjustment support method, and rotor centering measurement device

Abstract

To perform rotor alignment adjustment with high accuracy in a short time.SOLUTION: A rotor centering measurement method according to an embodiment is the method for measuring core difference and face gap amount between couplings of two rotors in a rotor system that includes two rotors that are connected to each other via respective couplings. The rotor centering measurement method includes: installing a laser measurement device which measures the relative position from one coupling to the other coupling on the couplings of the two rotors; and acquiring data on core difference and face gap amount between the couplings by the laser measurement device while continuously rotating the two rotors simultaneously.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] An embodiment of the present invention relates to a rotor centering measurement method, a rotor alignment adjustment support method, and a rotor centering measurement device. [Background technology]

[0002] A rotor system is a device including two rotors connected via respective couplings. FIG. 1 is a schematic diagram showing a schematic configuration of a rotor system. As shown in FIG. 1, in the rotor system 1, a coupling 3 is provided at the end of each rotor 2, and two adjacent rotors 2 are connected via the coupling 3. Each rotor 2 is supported by a bearing 4. The positional relationship of each rotor 2 is also called rotor alignment.

[0003] As shown in FIG. 1, the alignment between two adjacent rotors 2 can be uniquely expressed by the center offset X between the couplings 3 of the two rotors 2 in the vertical and horizontal directions and the surface opening amount Y in the vertical and horizontal directions.

[0004] In general rotor alignment adjustment, the center difference X and the amount of surface opening Y in the vertical and horizontal directions between the couplings 3 are measured, and the rotor position is adjusted to the planned value by adjusting these center difference X and amount of surface opening Y to within the design tolerances. For this reason, when installing equipment or disassembling and assembling for equipment maintenance, centering measurements are performed to measure these center difference X and amount of surface opening Y. The rotor position is adjusted by moving the bearing 4 that supports the rotor 2 in the vertical and horizontal directions.

[0005] Here, a general centering measurement will be described. Figures 2 and 3 are enlarged views showing two couplings of a rotor system during general centering measurement. As shown in Figure 2, during centering measurement, a dial gauge 8 for measuring the radial runout (displacement) of the other coupling 3b is attached to one coupling 3a via a magnet stand. Also, as shown in Figure 3, a cylinder gauge 9 is used to measure the runout in the out-of-plane direction (axial direction) of the other coupling 3b.

[0006] In general centering measurements, the rotor angles engraved on each rotor 2a, 2b are used as a reference, and measurements are taken using a dial gauge 8 and a cylinder gauge 9 while manually rotating each rotor 2a, 2b in turn to rotor angles of 0°, 90°, 180°, and 270°.

[0007] More specifically, first, both rotors 2a, 2b are positioned so that the rotor angle of 0° is directly above, and measurement values ​​are obtained using the dial gauge 8 and cylinder gauge 9. Next, one of the rotors, 2a, is rotated 90° so that the rotor angle of 90° is directly above, and then the other rotor, 2b, is also rotated 90° so that the rotor angle of 90° is directly above, and measurement values ​​are obtained using the dial gauge 8 and cylinder gauge 9.

[0008] Next, one rotor 2a is rotated another 90° so that the rotor angle of 180° is directly above, and then the other rotor 2b is also rotated another 90° so that the rotor angle of 180° is directly above, and measurement values ​​are obtained using the dial gauge 8 and the cylinder gauge 9. Then, one rotor 2a is rotated another 90° so that the rotor angle of 270° is directly above, and then the other rotor 2b is also rotated 90° so that the rotor angle of 270° is directly above, and measurement values ​​are obtained using the dial gauge 8 and the cylinder gauge 9.

[0009] Finally, one of the rotors 2a is rotated a further 90° so that the rotor angle of 0° is directly above again, and then the other rotor 2b is also rotated 90° so that the rotor angle of 0° is directly above again, and measurement values ​​are obtained using the dial gauge 8 and cylinder gauge 9. The reproducibility of the data is confirmed by confirming that the measurement values ​​when the final rotors 2a, 2b have a rotor angle of 0° have returned to the measurement values ​​when the initial rotors 2a, 2b have a rotor angle of 0°.

[0010] The center difference X in the up-down direction between the couplings 3 can be calculated from half the difference in the measurement value of the dial gauge 8 in the up-down direction (for example, when a rotor angle of 0° is directly above and when a rotor angle of 180° is directly above). The center difference X in the left-right direction between the couplings 3 can be calculated from half the difference in the measurement value of the dial gauge 8 in the left-right direction (for example, when a rotor angle of 90° is directly above and when a rotor angle of 270° is directly above).

[0011] The surface opening amount Y between the couplings 3 in the up-down direction can be calculated by measuring at four circumferential points with the cylinder gauge 9 in each of the up-down directions (for example, when a rotor angle of 0° is directly above and when a rotor angle of 180° is directly above) and calculating the difference between the average value calculated from the measured values ​​at the four circumferential points. The surface opening amount Y between the couplings 3 in the left-right direction can be calculated by measuring at four circumferential points with the cylinder gauge 9 in each of the left-right directions (for example, when a rotor angle of 90° is directly above and when a rotor angle of 270° is directly above) and calculating the difference between the average value calculated from the measured values ​​at the four circumferential points.

[0012] In this way, in general centering measurement, the separated rotors 2a, 2b are rotated and their angles are adjusted while measurements are taken at four points in the circumferential direction, to obtain the center difference X and the face opening amount Y in the vertical and horizontal directions.

[0013] Design values ​​are set for the center difference X and the face opening amount Y, which are determined based on the assumption that the bearing position will change during operation at the time of design. In rotor alignment adjustment, the bearing position is adjusted so that the center difference X and the face opening amount Y are within the design tolerance, which is the design value plus a tolerance. [Prior art documents] [Patent documents]

[0014] [Patent Document 1] JP 2008-261677 A Summary of the Invention [Problem to be solved by the invention]

[0015] However, in general centering measurement, the measurement value may include the following three disturbance factors, which may cause the measurement value to deviate from the true value, reducing the adjustment accuracy in rotor alignment adjustment, and increasing the number of adjustments and the adjustment time.

[0016] Here, the three disturbance elements will be described.

[0017] The first disturbance factor is the oil remaining in the bearing 4. In some devices, jacking oil 11 is supplied to the bearing 4 to jack up the rotor 2 in order to rotate the rotor 2. In such devices, as shown in Fig. 4, jacking oil 11 is supplied to the bearing 4 via an oil supply line 12 when the rotor 2 rotates, causing the rotor 2 to float from the bearing metal 13 of the bearing 4. When performing centering measurement, the supply of jacking oil 11 to the bearing 4 is stopped and measurement is performed.

[0018] However, as shown in Fig. 4, because a check valve 14 is installed in the oil supply line 12, it may take a long time for the jacking oil 11 to drain from the bearing 4 even after the supply of the jacking oil 11 is stopped. For this reason, jacking oil 11 remains in the bearing 4 during centering measurement, and as shown in Fig. 5, this remaining oil may cause the rotor 2 to float. Furthermore, in the measurements at each of the four circumferential points, variation in the axial center position of the rotor 2 may occur due to variation in the hydraulic pressure of the remaining oil. This variation may become a disturbance that reduces the measurement accuracy of the centering measurement value.

[0019] The second disturbance factor is bending of the rotor 2. As shown in Fig. 6, bending of the rotor 2 occurs due to the temperature difference between the upper and lower halves of the rotor 2 between the bearings 4, which may cause eccentricity in the coupling 3 located at the tip of the overhanging part. In addition, as shown in Fig. 7, when jacking oil 11 is supplied to the bearing 4, the temperature of the jacking oil 11 is higher than the temperature inside the bearing 4. For this reason, the temperature difference between the top and bottom of the bearing journal of the rotor 2 may cause bending of the overhanging part of the rotor 2 with the bearing journal as the inflection point.

[0020] Such eccentricity of the coupling 3 due to bending of the rotor 2 can be a disturbance to the measured value of the centering measurement. Even if eccentricity of the coupling 3 occurs, it is not a major problem if the eccentricity does not change during the measurement at four circumferential points. However, such bending of the rotor 2 is temporary, and the bending of the rotor 2 may change while the rotor 2 is rotating between the measurements at the four circumferential points. For this reason, the eccentricity of the coupling 3 changes during the measurement at the four circumferential points, which can be a disturbance that reduces the measurement accuracy of the measured value of the centering measurement.

[0021] The third disturbance factor is the lateral runout of the rotor 2. As shown in FIG. 8, when the bearing 4 is a load-on-pad type bearing, the axial center 2c of the rotor 2 may move left and right in the bearing journal when the rotor 2 is rotated between measurements at four circumferential points. For this reason, as shown in FIG. 9, before the centering measurement, a wedge 15 is inserted into the back surface of the pad 4p of the bearing 4 to adjust the axial center 2c of the rotor 2 in the bearing journal to the bearing center, and then the wedge 15 is driven in to suppress the left and right movement (lateral runout) of the rotor 2. Note that in the example shown in FIG. 9, the upper half of the bearing 4 is removed.

[0022] However, even so, when the rotor 2 is rotated between measurements at four circumferential points, the axial center 2c of the rotor 2 may move, causing misalignment. In this case, the amount of misalignment may become a disturbance to the measurement value of the centering measurement. In addition, since the rotor alignment adjustment requires an adjustment accuracy on the order of several tens of μm, the axial center 2c of the rotor 2 also requires a positional accuracy on the order of several tens of μm. However, such minute adjustments may be difficult when the bearing load of the rotor is very large. Thus, when the bearing 4 is a load-on-pad type bearing, the lateral runout of the rotor 2 may become a disturbance that reduces the measurement accuracy of the measurement value of the centering measurement.

[0023] In particular, when jacking oil 11 is used to rotate the rotor 2, the above three disturbance factors may be included as disturbances in the measured value during centering measurement. In this case, in particular, a decrease in the measurement accuracy of the centering measurement may decrease the estimation accuracy of the adjustment amount in rotor alignment adjustment, and an increase in the number of adjustments may increase the adjustment time.

[0024] In addition, the general centering measurement described above is a method that depends on the individual, in which the centering difference X between the couplings 3 is measured with a dial gauge 8 and the surface opening amount Y between the couplings 3 is measured with a cylinder gauge 9, and this method results in variations in the measurements.

[0025] In order to avoid such variations due to personal measurement, a measurement method has been considered in which a laser measurement device is installed on the coupling 3 and the centering difference X and the face opening amount Y between the couplings 3 are measured by the laser measurement device. However, this measurement method also only replaces the measurement using the dial gauge 8 and the cylinder gauge 9 in general centering measurement with the measurement using the laser measurement device, and is similar to the conventional personal measurement in that the measurement is performed while manually rotating each of the rotors 2a and 2b to rotor angles of 0°, 90°, 180°, and 270° in order. For this reason, the above three disturbance factors can be included in the measurement value, and the above problem has not been solved.

[0026] Therefore, there was a need to develop technology that would enable rotor alignment adjustment with high precision and in a short time by eliminating the effects of the three disturbance factors mentioned above, improving the measurement accuracy of centering measurement, and shortening the measurement time.

[0027] In view of the above, an object of the present invention is to provide a rotor centering measurement method, a rotor alignment adjustment support method, and a rotor centering measurement device that are capable of performing rotor alignment adjustment with high accuracy and in a short time. [Means for solving the problem]

[0028] A rotor centering measurement method according to an embodiment is a method for measuring the centering difference and the face opening between the couplings of two rotors in a rotor system including two rotors connected via their respective couplings. In the rotor centering measurement method, a laser measurement device is installed on the couplings of the two rotors, which measures the relative position of one coupling from the other coupling. Then, while the two rotors are continuously rotating together, data related to the centering difference and the face opening between the couplings is obtained by the laser measurement device.

[0029] Furthermore, the rotor alignment adjustment support method according to the embodiment displays on a display device the calculated center misalignment and face opening amount between the couplings and the amount of deviation from their respective design values.

[0030] In addition, the rotor alignment adjustment support method according to the embodiment displays, on a display device, an estimated adjustment amount for the position of one of the two rotors, based on the other rotor, based on the calculated center misalignment and face opening amount between the couplings.

[0031] Moreover, a rotor centering measurement device according to an embodiment is a device for measuring the center misalignment and the face opening amount between the couplings of two rotors in a rotor system including two rotors connected via their respective couplings. The rotor centering measurement device is provided with a laser measurement device that is installed on the couplings of the two rotors and measures the relative position of one coupling from the other coupling. The rotor centering measurement device also includes a connecting pin that connects the couplings of the two rotors by being inserted into a bolt hole of the coupling. The laser measurement device acquires data related to the center misalignment and the face opening amount between the couplings while the two rotors connected via the connecting pin are continuously rotating together. Effect of the Invention

[0032] According to the present invention, rotor alignment can be adjusted with high accuracy in a short time. [Brief description of the drawings]

[0033] [Figure 1] FIG. 1 is a schematic diagram showing a schematic configuration of a rotor system. [Diagram 2] FIG. 2 is an enlarged view of two couplings of a rotor system during a typical centering measurement. [Diagram 3] FIG. 3 is an enlarged view of two couplings of a rotor system during a typical centering measurement. [Figure 4] FIG. 4 is a diagram for explaining the first disturbance factor, and is a schematic diagram of a bearing to which jacking oil is supplied. [Diagram 5]FIG. 5 is a diagram for explaining the first disturbance factor, showing a state in which the rotor is floated by remaining oil. [Figure 6] FIG. 6 is a diagram for explaining the second disturbance factor, showing how the rotor is bent due to a temperature difference between the upper and lower halves of the rotor. [Figure 7] FIG. 7 is a diagram for explaining the second disturbance factor, showing how bending of the rotor occurs due to a temperature difference between the top and bottom of the bearing journal of the rotor. [Figure 8] FIG. 8 is a diagram for explaining the third disturbance factor, and is a schematic diagram showing a state in which lateral runout occurs in the rotor when the bearing is a load-on-pad type bearing. [Figure 9] FIG. 9 is a diagram for explaining the third disturbance factor, and is a schematic diagram showing how lateral runout of the rotor is suppressed by wedges in a load-on-pad type bearing. [Figure 10] FIG. 10 is a diagram showing the rotor centering measurement device according to the first embodiment. [Figure 11] FIG. 11 is a view of the rotor centering measuring device of FIG. 10 as viewed from the axial direction. [Figure 12] FIG. 12 is a schematic diagram showing an irradiator and a detection surface of the laser measurement device included in FIG. [Figure 13] FIG. 13 is a diagram showing the connecting pin included in FIG. [Figure 14] FIG. 14 shows a modification of FIG. [Figure 15] FIG. 15 is a view of the rotor centering measuring device of FIG. 14 as viewed from the axial direction. [Figure 16] FIG. 16 is a diagram showing the rotor system used in the mock-up test. [Figure 17] FIG. 17 is a schematic diagram showing the bearing included in FIG. [Figure 18] FIG. 18 is a graph showing the measurement results of the comparative example and the example. [Figure 19]FIG. 19 is a diagram showing a connecting pin of the rotor centering measurement device according to the second embodiment. [Figure 20] FIG. 20 is a diagram showing a rotor centering measurement device according to the third embodiment. [Figure 21] FIG. 21 is a diagram showing a rotor centering measurement device according to the fourth embodiment. [Figure 22] FIG. 22 is a schematic diagram showing a left-right movement restricting device of a rotor centering measurement device according to the fifth embodiment. [Figure 23] FIG. 23 is a schematic diagram showing a vibrometer installed on a bearing of a rotor in the rotor centering measurement method according to the sixth embodiment. [Figure 24] FIG. 24 is a schematic diagram showing a displacement sensor installed in the vicinity of a bearing of a rotor in a rotor centering measurement method according to the sixth embodiment. [Diagram 25] FIG. 25 is a schematic diagram for illustrating the influence of the amount of change in the axial center position of the rotor in each bearing on the center error and the amount of face opening between the couplings in the rotor centering measurement method according to the sixth embodiment. [Figure 26] FIG. 26 is a diagram showing an example of a screen displayed on a display device in the rotor alignment adjusting method according to the seventh embodiment. [Figure 27] FIG. 27 is a diagram showing an example of a screen displayed on a display device in the rotor alignment adjusting method according to the eighth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotor centering measurement method, a rotor alignment adjustment assistance method, and a rotor centering measurement device according to embodiments of the present invention will be described below with reference to the drawings.

[0035] (First embodiment) A rotor centering measurement device and a rotor centering measurement method according to a first embodiment will be described with reference to FIGS.

[0036] First, a rotor system to which the rotor centering measurement device and rotor centering measurement method according to this embodiment are applied will be described.

[0037] As shown in Fig. 1, the rotor system 1 includes two rotors 2. The rotors 2 may be turbine rotors such as steam turbines or gas turbines used in thermal power plants or the like. A coupling 3 is provided at an end of each rotor 2, and two adjacent rotors 2 are connected via the coupling 3. Each rotor 2 is rotatably supported by two bearings 4.

[0038] As described above, the alignment between two adjacent rotors 2 can be uniquely expressed by the center difference X in the up-down and left-right directions between the couplings 3 of the two rotors 2 and the surface opening amount Y in the up-down and left-right directions. Here, the center difference X is the amount of deviation between the centers (center points on the outermost surfaces) of the two couplings 3. The surface opening amount Y is the maximum opening amount between the outer surfaces of the two couplings 3. The left-right direction means the left-right direction when viewed along the axial direction. The up-down direction means the vertical direction (direction of gravity).

[0039] In rotor alignment adjustment, the center difference X and the amount of surface space Y between the couplings 3 in the vertical and horizontal directions are measured, and the rotor position is adjusted to the planned value by adjusting the center difference X and the amount of surface space Y to within the design tolerances. The rotor position is adjusted by moving the bearings 4 that support the rotors 2 in the vertical and horizontal directions. Measuring the center difference X and the amount of surface space Y between the couplings 3 of the two rotors 2 in the vertical and horizontal directions is called rotor centering measurement.

[0040] Next, the rotor centering measurement device according to the present embodiment will be described with reference to FIGS.

[0041] The rotor centering measurement device 20 according to this embodiment is a device for measuring the center error X and the face opening amount Y between the couplings 3 of two rotors 2 in a rotor system 1. As shown in Fig. 10 and Fig. 11, the rotor centering measurement device 20 includes a laser measurement device 30 and a connecting pin 40.

[0042] First, the laser measurement device 30 will be described. The laser measurement device 30 is installed on the couplings 3 of the two rotors 2. As shown in Fig. 10 and Fig. 11, the couplings 3 are provided with a plurality of bolt holes 3c aligned along the circumferential direction in order to connect adjacent couplings 3 with coupling bolts. In the example shown in Fig. 11, eight bolt holes 3c are provided in the coupling 3. The laser measurement device 30 is disposed at a position corresponding to any one of the bolt holes 3c.

[0043] As shown in FIG. 10, the laser measurement device 30 includes a laser irradiation unit 31 that irradiates a laser 35 and a laser detection unit 32 that detects the laser 35. The laser irradiation unit 31 is installed in one coupling 3a of the two couplings 3, and the laser detection unit 32 is installed in the other coupling 3b of the two couplings 3. The laser irradiation unit 31 is installed on the surface of the coupling 3a opposite to the surface facing the coupling 3b. The laser irradiation unit 31 may be fixed to the coupling 3a by a fixing jig. The laser detection unit 32 is installed on the surface of the coupling 3b opposite to the surface facing the coupling 3a. The laser detection unit 32 may be fixed to the coupling 3b by a fixing jig.

[0044] The laser 35 irradiated from the laser irradiation unit 31 passes through the bolt hole 3c of the coupling 3a and heads toward the coupling 3b. The laser 35 that has passed through the bolt hole 3c of the coupling 3a passes through the bolt hole 3c of the coupling 3b, reaches the laser detection unit 32, and is detected by the laser detection unit 32.

[0045] As shown in Figs. 10 and 12, the laser irradiation unit 31 includes an irradiator 31a that irradiates a laser 35. The laser detection unit 32 includes a first detection surface 32a and a second detection surface 32b that detect the laser 35. The first detection surface 32a and the second detection surface 32b are arranged side by side in the axial direction. The second detection surface 32b is arranged at a position farther away from the irradiator 31a than the first detection surface 32a. The laser 35 irradiated from the irradiator 31a is detected by the first detection surface 32a, and is detected by the second detection surface 32b after passing through the first detection surface 32a.

[0046] Such a laser measurement device 30 can measure the relative position of one coupling 3a to the other coupling 3b. More specifically, the relative position coordinates of the other coupling 3b with respect to the one coupling 3a can be detected from the detection result by the first detection surface 32a. Therefore, it is possible to calculate the amount of deviation of the other coupling 3b with respect to the one coupling 3a in the up-down and left-right directions, and the core difference X between the couplings 3 in the up-down and left-right directions can be calculated.

[0047] Also, the inclination of one coupling 3b relative to the other coupling 3a can be measured from the detection results by the first detection surface 32a and the second detection surface 32b. For example, the distance between the first detection surface 32a and the second detection surface 32b is d, the position coordinate in the vertical direction of the first detection surface 32a is y1, and the position coordinate in the vertical direction of the second detection surface 32b is y2. In this case, the inclination α of the coupling 3b in the vertical direction can be calculated by α=(y2-y1) / d (see FIG. 12). From this inclination of the coupling 3b, the surface opening amount Y between the couplings 3 in the vertical and horizontal directions can be calculated.

[0048] In this manner, the laser measurement device 30 can obtain data relating to the center difference X and the face opening amount Y between the couplings 3 of the two rotors 2.

[0049] Next, the connecting pin 40 will be described. The connecting pin 40 is used to connect the couplings 3 of the two rotors 2. As shown in Figs. 10 and 11, the connecting pin 40 is inserted into the bolt holes 3c of the couplings 3. More specifically, the connecting pin 40 is inserted into the bolt holes 3c of one coupling 3a, and is also inserted into the bolt holes 3c of the other coupling 3b. In this way, the connecting pin 40 is inserted into the bolt holes 3c of the couplings 3a, 3b, thereby connecting the two couplings 3a, 3b.

[0050] As shown in FIG. 10 and FIG. 13, the connecting pin 40 has a rod shape extending in the axial direction. The connecting pin 40 may have a cylindrical shape. The connecting pin 40 may be made of a metal material. Washers 41 may be provided at both ends of the connecting pin 40. The washers 41 may be fixed to both ends of the connecting pin 40 by bolts 42. More specifically, as shown in FIG. 13, bolt holes 40c may be formed at both ends of the connecting pin 40, and a through hole 41c may be formed in the center of the washer 41. Then, the bolts 42 may pass through the through holes 41c of the washer 41 and screw into the bolt holes 40c of the connecting pin 40, thereby fixing the washer 41 to the connecting pin 40.

[0051] 10 and 11, the connecting pin 40 may be provided in any one of the multiple bolt holes 3c of the coupling 3. As shown in Fig. 11, the connecting pin 40 may be provided in the bolt hole 3c on the opposite side in the radial direction to the bolt hole 3c in which the laser measurement device 30 is installed. In other words, the connecting pin 40 may be provided at an interval of 180° with respect to the laser measurement device 30 in the circumferential direction.

[0052] In the example shown in Figures 10 and 11, only one connecting pin 40 is provided, but as shown in Figures 14 and 15, multiple connecting pins 40 may be provided. That is, the couplings 3 of the two rotors 2 may be connected by multiple connecting pins 40. In the example shown in Figures 14 and 15, two connecting pins 40 are provided.

[0053] Also, as shown in FIG. 15, the multiple connecting pins 40 may be arranged at equal intervals in the circumferential direction. That is, the multiple connecting pins 40 may be inserted into the bolt holes 3c of the coupling 3 at equal intervals in the circumferential direction. In the example shown in FIG. 15, the two connecting pins 40 are arranged in the bolt holes 3c located on opposite sides in the radial direction. That is, the two connecting pins 40 are arranged at an interval of 180° from each other in the circumferential direction. Also, in the example shown in FIG. 15, the laser measurement device 30 is arranged between the two connecting pins 40 in the circumferential direction. That is, the laser measurement device 30 is arranged at an interval of 90° from the two connecting pins 40.

[0054] The rotational torque of one rotor 2a can be transmitted to the other rotor 2b by such a connecting pin 40. In other words, by connecting two couplings 3 with the connecting pin 40, the two rotors 2 connected via the connecting pin 40 can be rotated together.

[0055] In this embodiment, the two rotors 2 are rotated continuously together during rotor centering measurement. The laser measurement device 30 acquires data on the center error X and the face opening amount Y between the couplings 3 while the two rotors 2 are rotating continuously together. During rotor centering measurement, the two rotors 2 are rotated continuously together at a low rotation speed of 10 rpm or less. Note that continuous rotation means that the rotation is not stopped during measurement and is continued at a predetermined rotation speed.

[0056] The rotor 2 is rotated by transmitting power from a rotating device (not shown). The rotating device may include, for example, a turning device installed in the facility (in the power plant). That is, the rotor 2 may be rotated by the turning device. The turning device can rotate the rotor 2 at a rotation speed of, for example, about 4 rpm to 10 rpm. The rotating device may also include, for example, an air motor. That is, for example, an air motor may be installed on the turning motor of the turning device, or the turning motor of the turning device may be removed and an air motor installed instead, and the air motor may be driven by air in the facility (in the power plant), thereby rotating the rotor 2. The rotation speed can be adjusted when the air motor is driven, and the rotor 2 can be rotated at a slow rotation speed of, for example, about 1 rpm. The rotor 2 may be rotated at a constant rotation speed.

[0057] As described above, when supplying jacking oil 11 to the bearing 4 to jack up the rotor 2, after starting the supply of jacking oil 11 to the bearing 4 and confirming that the rotor 2 has floated up on the bearing 4, the rotating device is started and the rotor 2 begins to rotate.

[0058] Next, the rotor centering measurement method according to this embodiment will be described.

[0059] The rotor centering measurement method according to this embodiment is a method for measuring the center difference X and face opening amount Y between the couplings 3 of two rotors 2 in a rotor system 1. The center difference X and face opening amount Y are measured in the up-down direction and the left-right direction, respectively. The rotor centering measurement method may include a laser measurement device installation step, a coupling connection step, a rotor rotation step, and a data acquisition step.

[0060] First, a laser measurement device installation step is performed. In the laser measurement device installation step, a laser measurement device 30 that measures the relative position from one coupling 3a to the other coupling 3b is installed on the couplings 3 of the two rotors 2.

[0061] More specifically, as shown in Fig. 10, a laser irradiation unit 31 of the laser measurement device 30 is installed on one coupling 3a, and a laser detection unit 32 of the laser measurement device 30 is installed on the other coupling 3b. The laser irradiation unit 31 is installed on the surface of the coupling 3a opposite to the surface facing the coupling 3b. The laser irradiation unit 31 is fixed to the coupling 3a by a fixing jig. The laser detection unit 32 is installed on the surface of the coupling 3b opposite to the surface facing the coupling 3a. The laser detection unit 32 is fixed to the coupling 3b by a fixing jig.

[0062] Next, a coupling connecting step is performed. The coupling connecting step is performed after the laser measurement device installation step. The coupling connecting step may be performed before the laser measurement device installation step. In the coupling connecting step, the couplings 3 of the two rotors 2 are connected by inserting the connecting pins 40 into the bolt holes 3c of the couplings 3.

[0063] More specifically, as shown in Fig. 10, the connecting pin 40 is inserted into the bolt hole 3c of one coupling 3a and the bolt hole 3c of the other coupling 3b. As shown in Fig. 11, the connecting pin 40 may be provided in the bolt hole 3c on the opposite side in the radial direction to the bolt hole 3c in which the laser measurement device 30 is installed. After the connecting pin 40 is inserted into the bolt holes 3c of the couplings 3a and 3b, washers 41 are placed on both ends of the connecting pin 40. Then, the washers 41 are fixed to both ends of the connecting pin 40 by bolts 42. In this manner, the two couplings 3 are connected by the connecting pin 40.

[0064] Here, as shown in Figures 14 and 15, the couplings 3 of the two rotors 2 may be connected by a plurality of connecting pins 40. In this case, as shown in Figure 15, the plurality of connecting pins 40 may be inserted into the bolt holes 3c of the couplings 3 at equal intervals in the circumferential direction. For example, as shown in Figures 14 and 15, the two couplings 3 may be connected by two connecting pins 40. Also, as shown in Figure 15, the two connecting pins 40 may be arranged at an interval of 180° from each other in the circumferential direction.

[0065] Next, a rotor rotating step is performed. The rotor rotating step is performed after the laser measurement device installation step and the coupling connecting step. In the rotor rotating step, the two rotors 2 connected via the connecting pins 40 are rotated together continuously.

[0066] More specifically, the two rotors 2 are rotated continuously together at a low rotation speed of 10 rpm or less. For example, the rotors 2 are rotated continuously at a rotation speed of 4 rpm to 10 rpm by a turning device. Furthermore, for example, the rotors 2 are rotated continuously at a very slow rotation speed of about 1 rpm by an air motor. Here, when supplying jacking oil 11 to the bearings 4, after starting the supply of jacking oil 11 to the bearings 4 and confirming that the rotors 2 have risen above the bearings 4, the rotating device is started and the rotors 2 begin to rotate.

[0067] Then, a data acquisition process is performed. The data acquisition process is performed while the rotor rotation process is being performed. That is, the data acquisition process is performed while the two rotors 2 are continuously rotating together. In the data acquisition process, while the two rotors 2 are continuously rotating together, data related to the center difference X and the face opening amount Y between the couplings 3 is acquired by the laser measurement device 30.

[0068] More specifically, the laser 35 is emitted from the irradiator 31a of the laser irradiation unit 31, and the laser 35 is detected by the first detection surface 32a and the second detection surface 32b of the laser detection unit 32, thereby measuring the relative position of the one coupling 3a to the other coupling 3b. From the detection result by the first detection surface 32a, the relative position coordinate of the other coupling 3b with respect to the one coupling 3a can be detected. Therefore, the amount of deviation of the other coupling 3b with respect to the one coupling 3a in the vertical and horizontal directions can be calculated, and the core difference X between the couplings 3 in the vertical and horizontal directions can be calculated. In addition, from the detection result by the first detection surface 32a and the second detection surface 32b, the inclination of the other coupling 3b with respect to the one coupling 3a can be measured. From this inclination of the coupling 3b, the surface opening amount Y between the couplings 3 in the vertical and horizontal directions can be calculated.

[0069] In this manner, data relating to the center difference X and the surface opening amount Y between the couplings 3 can be obtained by the laser measurement device 30.

[0070] Thus, according to this embodiment, while the two rotors 2 are rotated continuously together, the laser measuring device 30 acquires data on the center difference X and the face opening amount Y between the couplings 3. As described above, the first of the three disturbance factors in general centering measurement is the remaining oil in the bearing 4. In general centering measurement, the measurement is performed while rotating each of the rotors 2a and 2b manually, so the supply of the jacking oil 11 is stopped and the measurement is performed after waiting until the jacking oil 11 is discharged from the bearing 4. However, during centering measurement, the jacking oil 11 remains in the bearing 4, and the rotor 2 may float due to this remaining oil. In addition, in each measurement at four circumferential points, the axial center position of the rotor 2 may vary due to the variation in the hydraulic pressure of the remaining oil. This variation may become a disturbance that reduces the measurement accuracy of the measurement value of the centering measurement. In contrast, according to this embodiment, since the measurement is performed while rotating the two rotors 2 continuously together, it is not necessary to drain the jacking oil 11 from the bearing 4. That is, the jacking oil 11 is supplied to the bearing 4, and the measurement can be performed with the rotor 2 stably floated. This makes it possible to avoid the situation in which the axial center position of the rotor 2 varies due to the influence of remaining oil. This eliminates the influence of the first disturbance factor, and improves the measurement accuracy. In addition, it is possible to eliminate the waiting time until the jacking oil 11 is discharged from the bearing 4 during measurement, thereby shortening the measurement time.

[0071] Also, as described above, the second disturbance element of the three disturbance elements in general centering measurement is the bending of the rotor 2. As described above, the rotor 2 may be bent due to the temperature difference between the upper and lower halves of the rotor 2 between the bearings 4. Also, the rotor 2 may be bent due to the temperature difference between the upper and lower bearing journals of the rotor 2 due to the jacking oil 11. Such bending of the rotor 2 causes eccentricity of the coupling 3. If the bending of the rotor 2 changes during centering measurement and the eccentricity of the coupling 3 changes, this bending of the rotor 2 can become a disturbance that reduces the measurement accuracy of the measured value of the centering measurement. In contrast, according to this embodiment, after starting the supply of the jacking oil 11 to the bearings 4 and confirming that the rotor 2 has risen, the rotor 2 is quickly started to rotate before the bending of the rotor 2 occurs, so that measurement can be performed without being affected by the bending of the rotor 2. This makes it possible to avoid a situation in which the eccentricity of the coupling 3 changes during centering measurement. Therefore, the influence of the second disturbance element can be eliminated, and the measurement accuracy can be improved. Furthermore, since the measurement can be performed quickly, the measurement time can be shortened.

[0072] As described above, according to the present embodiment, it is possible to eliminate the influence of disturbance factors, improve the measurement accuracy of the centering measurement, and shorten the measurement time. As a result, rotor alignment adjustment can be performed with high accuracy and in a short time.

[0073] Furthermore, in typical centering measurement, as described above, the rotor 2 is rotated manually while the measurement is performed, but more specifically, the rotor 2 is rotated by winding a wire around it and hoisting it up with an overhead crane. For this reason, the overhead crane is occupied during centering measurement, and maintenance work that requires another crane cannot be performed. In contrast, according to this embodiment, the rotor 2 can be continuously rotated by a rotation device, making it unnecessary to use the overhead crane. Therefore, it is possible to avoid occupying the overhead crane during centering measurement.

[0074] Also, according to this embodiment, the couplings 3 of the two rotors 2 are connected by inserting the connecting pin 40 into the bolt holes 3c of the coupling 3. Then, the two rotors 2 connected via the connecting pin 40 are continuously rotated together, while data is acquired by the laser measurement device 30. By using the connecting pin 40, the couplings 3 of the two rotors 2 can be reliably connected. Therefore, the two rotors 2 can be stably rotated together continuously. As a result, the measurement accuracy of the centering measurement can be improved.

[0075] In this embodiment, the couplings 3 of the two rotors 2 may be connected by a plurality of connecting pins 40. The plurality of connecting pins 40 may be inserted into the bolt holes 3c of the couplings 3 at equal intervals in the circumferential direction. By using a plurality of connecting pins 40, the couplings 3 of the two rotors 2 can be connected more reliably. Furthermore, by arranging the plurality of connecting pins 40 at equal intervals in the circumferential direction, the load acting on the couplings 3 in the circumferential direction is made uniform, and bending of the rotors 2 can be suppressed. This makes it possible to further improve the measurement accuracy of the centering measurement.

[0076] Furthermore, according to the study by the present inventors, it was found that the present embodiment exhibits high reproducibility compared to other measurement methods that were examined. Examples of this study will be described below.

[0077] A mock-up test was carried out to evaluate the repeatability of measurements made by the measurement method. The rotor system 1 (mock-up test machine) used in the mock-up test is shown in FIG. 16. In the rotor system 1 shown in FIG. 16, an actual turbine rotor was used as the rotor 2. As shown in FIG. 17, a V-block with a V-groove was used as the bearing 4. A polymer resin sheet 36 coated with a lubricant was placed between the bearing 4 and the rotor 2. A rotating device 50 placed at the end of the rotor 2b opposite to the rotor 2a was used to rotate the rotor 2.

[0078] In Comparative Example 1, as in the general centering measurement described above, the two rotors 2a, 2b were rotated individually to rotor angles of 0°, 90°, 180°, and 270° in order, and the rotor angles of the two rotors 2a, 2b were adjusted so that they were aligned directly above each other, and measurement was performed with both rotors 2a, 2b stopped. Note that the measurement was performed using a laser measurement device 30 installed on the coupling 3, rather than using a dial gauge 8 and a cylinder gauge 9 as in the general centering measurement. This measurement method is also called multi-point measurement.

[0079] In Comparative Example 2, the laser detection unit 32 of the laser measurement device 30 was installed on the coupling 3a of one rotor 2a, and the laser irradiation unit 31 of the laser measurement device 30 was installed on the coupling 3b of the other rotor 2b. The rotor 2b on which the laser irradiation unit 31 was installed was continuously rotated by the rotation device 50, and the rotor 2a on which the laser detection unit 32 was installed was stopped so that the rotor angles of 0°, 90°, 180°, and 270° were directly above. In each of the four stopped states related to the rotor angle of the rotor 2a, the laser 35 was irradiated from the laser irradiation unit 31 while only the rotor 2b was continuously rotated, and measurement was performed at the timing when the laser 35 passed the laser detection unit 32. This measurement method is also called pass mode measurement.

[0080] In the example, the rotor centering measurement method according to the present embodiment described above was used. That is, the laser irradiation unit 31 of the laser measurement device 30 was installed on the coupling 3a of one rotor 2a, and the laser detection unit 32 of the laser measurement device 30 was installed on the coupling 3b of the other rotor 2b. In addition, the couplings 3a and 3b of the two rotors 2a and 2b were connected by a connecting pin 40. Then, the two rotors 2a and 2b connected via the connecting pin 40 were rotated together by a rotating device 50, and measurement was performed by the laser measurement device 30.

[0081] In the mock-up test, the measurement was performed after confirming that the oil film thickness of the remaining oil in the bearing 4 was 1 / 100 mm or less and that the rotor 2 was not bent using a displacement sensor installed at the bottom of the coupling 3. In addition, since the rotor 2 was supported by the V-block bearing 4, the rotor 2 did not wobble sideways. In other words, the effects of the above-mentioned three disturbance factors were eliminated in the mock-up test. In this way, the effects of the three disturbance factors were eliminated, and the difference in reproducibility due to the difference between the three measurement methods of the above-mentioned Comparative Example 1, Comparative Example 2, and Example was evaluated. In these measurements, a certain small misalignment was given between the rotors 2, and measurements were performed using the three measurement methods under the same conditions with the state kept constant, and the reproducibility of the measurement data was evaluated by looking at the variation in the measurement data.

[0082] These measurement results are shown in FIG. 18. FIG. 18(a) is a graph showing the center difference between the couplings of the two rotors, with the vertical axis showing the center difference in the up-down direction and the horizontal axis showing the center difference in the left-right direction. FIG. 18(b) is a graph showing the surface opening amount between the couplings of the two rotors, with the vertical axis showing the surface opening amount in the up-down direction and the horizontal axis showing the surface opening amount in the left-right direction. In the graphs of FIG. 18(a) and FIG. 18(b), the plots of reference numeral 60 show the measurement results of Comparative Example 1, the plots of reference numeral 61 show the measurement results of Comparative Example 2, and the plots of reference numeral 62 show the measurement results of the embodiment. Reference numeral 63 shows the range of the design allowable value. In the graphs of FIG. 18(a) and FIG. 18(b), one scale on the vertical axis and the horizontal axis is 0.01 mm.

[0083] As shown in Fig. 18(a) and Fig. 18(b), in the Example, the variation in the measurement data was smaller in both the core difference and the face opening amount than in Comparative Example 1 and Comparative Example 2. In the Example, almost no variation was observed in the measurement data. In Comparative Example 1 (multipoint measurement), a large variation was observed in the measurement data. In Comparative Example 2 (pass mode measurement), the variation in the measurement data was smaller than in Comparative Example 1, but variation was still observed in the measurement data. Therefore, it was confirmed that the Example had higher reproducibility of the measurement than Comparative Example 1 and Comparative Example 2.

[0084] According to this embodiment, at least one of the rotors 2a, 2b is rotated in sequence through rotor angles of 0°, 90°, 180°, and 270°, and measurements are not taken while at least one of the rotors 2a, 2b is stopped at each rotor angle, thereby reducing variation in the measurement data and achieving high measurement reproducibility.

[0085] (Second embodiment) Next, a rotor centering measurement device and a rotor centering measurement method according to a second embodiment will be described with reference to FIG.

[0086] The second embodiment shown in Fig. 19 differs mainly in that a protective tube for protecting the bolt hole is disposed on the outer peripheral surface of the connecting pin. The other configurations are substantially the same as those of the first embodiment shown in Figs. 10 to 18. In Fig. 19, the same parts as those of the first embodiment shown in Figs. 10 to 18 are given the same reference numerals and detailed description thereof will be omitted.

[0087] 19, in this embodiment, a protective tube 43 is arranged on the outer circumferential surface of the connecting pin 40. That is, the rotor centering measurement device 20 according to this embodiment includes the protective tube 43 arranged on the outer circumferential surface of the connecting pin 40. In addition, the rotor centering measurement method according to this embodiment includes a protective tube arrangement step of arranging the protective tube 43 on the outer circumferential surface of the connecting pin 40. The protective tube 43 is a member that protects the bolt hole 3c of the coupling 3.

[0088] As described above, the bolt holes 3c are provided in each coupling 3 in order to fasten adjacent couplings 3 with a coupling bolt. The bolt holes 3c are provided with reamed reamed portions. Here, when the rotor 2 is continuously rotated with the connecting pin 40 inserted in the bolt hole 3c, the connecting pin 40 may move in the bolt hole 3c and come into contact with the reamed portion of the bolt hole 3c when the rotor 2 starts to rotate or stops to possibly damage the reamed portion. For this reason, in this embodiment, the protective sleeve 43 is wrapped around the connecting pin 40 to protect the reamed portion of the bolt hole 3c.

[0089] The protective tube 43 may have a cylindrical shape. The protective tube 43 may cover the entire outer circumferential surface of the connecting pin 40, or may cover only a portion of the outer circumferential surface of the connecting pin 40. For example, the protective tube 43 may be provided only on a portion of the outer circumferential surface of the connecting pin 40 that is located at the bolt hole 3c.

[0090] The protective tube 43 may be made of, for example, a resin material. The protective tube 43 may be made of, for example, a fluororesin such as PTFE. A gap of 1 mm or more and 5 mm or less may be provided between the outer peripheral surface of the protective tube 43 and the inner peripheral surface of the bolt hole 3c, the gap being the alignment setting value (design offset amount) plus.

[0091] As described above, according to this embodiment, a protective tube 43 that protects the bolt hole 3c of the coupling 3 is disposed on the outer circumferential surface of the connecting pin 40. This makes it possible to prevent the connecting pin 40 from moving within the bolt hole 3c and coming into contact with the reamed portion of the bolt hole 3c when the rotors 2 start or stop rotating when the rotors 2 are continuously rotated together. This makes it possible to prevent damage to the reamed portion of the bolt hole 3c.

[0092] (Third embodiment) Next, a rotor centering measurement device and a rotor centering measurement method according to a third embodiment will be described with reference to FIG.

[0093] The third embodiment shown in Fig. 20 differs mainly in that a spacer is disposed between the couplings of the two rotors. The other configurations are substantially the same as those of the first embodiment shown in Figs. 10 to 18. In Fig. 20, the same parts as those of the first embodiment shown in Figs. 10 to 18 are denoted by the same reference numerals and detailed description thereof will be omitted.

[0094] In this embodiment, as shown in Fig. 20, a spacer 44 is disposed between the couplings 3 of the two rotors 2. That is, the rotor centering measurement device 20 according to this embodiment includes the spacer 44 disposed between the couplings 3 of the two rotors 2. In addition, the rotor centering measurement method according to this embodiment includes a spacer disposing step of disposing the spacer 44 between the couplings 3 of the two rotors 2. The spacer 44 fixes the axial position of the coupling 3. That is, the spacer 44 restricts the axial movement of the coupling 3.

[0095] One of the two rotors 2 may be provided with a thrust bearing (not shown) to restrict the axial movement of the rotor 2. However, even in this case, the other rotor 2 may not be provided with a thrust bearing, and the rotor 2 may move in the axial direction while the rotor 2 is continuously rotating. If the rotor 2 moves in the axial direction, this movement may become a new disturbance, which may reduce the measurement accuracy. For this reason, in this embodiment, a spacer 44 is disposed between the couplings 3 to fix the axial position of the coupling 3.

[0096] The spacer 44 may be disposed anywhere between the couplings 3 of the two rotors 2, but may be provided on the connecting pin 40, for example, as shown in Fig. 20. More specifically, the spacer 44 may be provided in the center of the connecting pin 40, in a portion sandwiched between two adjacent couplings 3.

[0097] The spacer 44 may have a cylindrical shape. A through hole 44c may be provided in the spacer 44, and the connecting pin 40 may be inserted into the through hole 44c. The spacer 44 may be located between two couplings 3 with the connecting pin 40 inserted into the through hole 44c. In addition, as shown in FIG. 20, when a plurality of connecting pins 40 are provided, a spacer 44 may be provided for each connecting pin 40.

[0098] As described above, the washers 41 are provided on both ends of the connecting pin 40. Therefore, the washers 41 can restrict the rotors 2 from moving away from each other in the axial direction.

[0099] As described above, according to this embodiment, the spacer 44 is disposed between the couplings 3 of the two rotors 2. This makes it possible to prevent the rotors 2 from moving in the axial direction when the two rotors 2 are rotated together continuously, and suppress deterioration of measurement accuracy.

[0100] (Fourth embodiment) Next, a rotor centering measurement device and a rotor centering measurement method according to a fourth embodiment will be described with reference to FIG.

[0101] The fourth embodiment shown in Fig. 21 differs mainly in that an axial movement restricting device that restricts the axial movement of the coupling is provided. The other configurations are substantially the same as those of the first embodiment shown in Figs. 10 to 18. In Fig. 21, the same parts as those of the first embodiment shown in Figs. 10 to 18 are given the same reference numerals and detailed description thereof will be omitted.

[0102] In this embodiment, as shown in Fig. 21, an axial movement restricting device 70 that restricts the axial movement of the coupling 3 is provided. That is, the rotor centering measurement device 20 according to this embodiment includes the axial movement restricting device 70 that restricts the axial movement of the coupling 3. The rotor centering measurement method according to this embodiment also includes an axial movement restricting device installation step of installing the axial movement restricting device 70 that restricts the axial movement of the coupling 3. Note that in the example shown in Fig. 21, the spacers 44 are provided on each connecting pin 40, similarly to the rotor centering measurement device 20 shown in Fig. 20 described in the third embodiment, but the present invention is not limited to this example.

[0103] The axial movement restricting device 70 restricts the axial movement of the coupling 3. The axial movement restricting device 70 may have two rods 71a and 71b. The rods 71a and 71b may be, for example, jack bolts. The axial movement restricting device 70 may restrict the movement of the couplings 3a and 3b in a direction away from each other in the axial direction by sandwiching the two couplings 3a and 3b with the two rods 71a and 71b in the axial direction. The rod 71a may press the coupling 3a from a surface of the coupling 3a opposite to the coupling 3b in a direction approaching the coupling 3b. The rod 71b may press the coupling 3b from a surface of the coupling 3b opposite to the coupling 3a in a direction approaching the coupling 3a.

[0104] The rods 71a and 71b may be located radially outward of the couplings 3a and 3b. The rods 71a and 71b may be located radially outward of the laser measurement device 30 and the connecting pin 40. The rods 71a and 71b may extend in the axial direction to ensure as much distance as possible in the axial direction. This can suppress transmission of vibration from the rods 71a and 71b to the laser measurement device 30 during rotation of the rotor 2, and suppress deterioration of measurement accuracy.

[0105] As described above, according to this embodiment, an axial movement restriction device 70 is provided that restricts the axial movement of the coupling 3. This makes it possible to more effectively restrict the axial movement of the coupling 3 when the two rotors 2 are rotated together continuously.

[0106] (Fifth embodiment) Next, a rotor centering measurement device and a rotor centering measurement method according to a fifth embodiment will be described with reference to FIG.

[0107] The fifth embodiment shown in Fig. 22 differs mainly in that a left-right movement restriction device is provided to restrict left-right movement of the rotor. The other configurations are substantially the same as those of the first embodiment shown in Figs. 10 to 18. In Fig. 22, the same parts as those of the first embodiment shown in Figs. 10 to 18 are given the same reference numerals and detailed description thereof will be omitted.

[0108] In this embodiment, as shown in Fig. 22, a left-right movement restriction device 75 is provided to restrict left-right movement of the rotor 2. That is, the rotor centering measurement device 20 according to this embodiment includes the left-right movement restriction device 75 that restricts left-right movement of the rotor 2. The rotor centering measurement method according to this embodiment also includes a left-right movement restriction device installation step of installing the left-right movement restriction device 75 that restricts left-right movement of the rotor 2.

[0109] The left-right movement restricting device 75 restricts the movement of the rotor 2 in the left-right direction. The left-right movement restricting device 75 may have two rods 76. The rod 76 may be, for example, a jack bolt. As shown in FIG. 22, a roller 77 may be provided at the tip of the rod 76. Alternatively, silver solder may be soldered to the tip of the rod 76. The roller 77 or silver solder is provided at a portion that contacts the rotor 2. The left-right movement restricting device 75 may restrict the left-right movement of the rotor 2 by attaching a pad with a material such as Teflon attached to the side that contacts the rotor 2 to the tip of the rod 76 and sandwiching the rotor 2 from the left and right directions with the pad in a state in which a lubricant is applied to the sliding surface between the pad and the rotor 2. The left-right movement restricting device 75 may restrict the left-right movement of the rotor 2 by sandwiching the rotor 2 from the left and right directions with the two rods 76. The rod 76 may press the rotor 2 via the roller 77 or silver solder. The left-right movement restriction device 75 may sandwich the rotor 2 between two rods 76 near the bearing 4. For example, the left-right movement restriction device 75 may sandwich the rotor 2 between two rods 76 at a position closer to the bearing 4 than the coupling 3.

[0110] Thus, according to this embodiment, a left-right movement restriction device 75 is provided to restrict the left-right movement of the rotor 2. As described above, the third disturbance element among the three disturbance elements in general centering measurement is the lateral runout of the rotor 2. As described above, when the bearing 4 is a load-on-pad type bearing, the shaft center 2c of the rotor 2 may move left-right in the bearing journal when the rotor 2 is rotated. This lateral runout of the rotor 2 may be a disturbance that reduces the measurement accuracy of the measurement value of the centering measurement. In contrast, according to this embodiment, the left-right movement restriction device 75 is provided, so that the left-right movement (lateral wobble) of the rotor 2 can be restricted. Therefore, the influence of the third disturbance element can be eliminated, and the measurement accuracy can be further improved.

[0111] (Sixth embodiment) Next, a rotor centering measurement method according to a sixth embodiment will be described with reference to FIGS.

[0112] In the sixth embodiment shown in Figs. 23 to 25, the amount of change in the axial position of the rotor is measured when the rotor is rotated continuously. Then, based on the measured amount of change in the axial position of the rotor, data acquired by a laser measurement device is corrected to calculate the center error and the face opening amount between the couplings when the rotor is stopped. The other configurations are substantially the same as those of the first embodiment shown in Figs. 10 to 18. In Figs. 23 to 25, the same parts as those of the first embodiment shown in Figs. 10 to 18 are denoted by the same reference numerals, and detailed explanations thereof will be omitted.

[0113] The rotor centering measuring device 20 according to this embodiment includes a shaft core position change measuring step and a data correcting step.

[0114] The shaft core position change amount measuring step is performed while the rotor rotation step is being performed. That is, the shaft core position change amount measuring step is performed while both rotors 2 are continuously rotating. The shaft core position change amount measuring step may be performed simultaneously with the data acquisition step, or may be performed separately. In the shaft core position change amount measuring step, the amount of change in the position of the shaft center 2c of the rotor 2 (shaft core position) when the rotor 2 is continuously rotated is measured.

[0115] More specifically, the shaft center position measuring device 80 measures the amount of change in the shaft center position of the rotor 2 when the rotor 2 is rotated continuously. First, when the rotor 2 is in a stopped state before the rotor 2 starts to rotate, the shaft center position of the rotor 2 is aligned with the center point of the bearing 4, and this position is set as the reference position (zero point). Note that, when the rotor 2 is in this stopped state, a sufficient amount of time has passed since the supply of jacking oil 11 to the bearing 4 was stopped, and the jacking oil 11 has leaked out from inside the bearing 4. Then, the shaft center position measuring device 80 measures the amount of displacement of the rotor 2 from the reference position when the rotor 2 is rotated continuously.

[0116] 23, a vibrometer 81 installed on a bearing 4 of a rotor 2 may be used as a shaft core position measuring device 80. That is, the amount of change in the shaft core position of the rotor 2 may be measured by the vibrometer 81 installed on the bearing 4. The vibrometer 81 may be, for example, an eddy-current type displacement sensor (gap sensor).

[0117] The vibrometer 81 may be installed in the upper half of the bearing 4. Furthermore, a plurality of vibrometers 81 may be installed on the bearing 4. In the example shown in Fig. 23, two vibrometers 81 are installed diagonally above the rotor 2 (diagonally upper left and diagonally upper right in Fig. 23).

[0118] In the shaft core position change measuring step, the change in shaft core position in the up-down direction and the left-right direction of the rotor 2 at each bearing 4 may be measured. In the example shown in Fig. 23, two vibrometers 81 are installed diagonally above the rotor 2, and therefore the change in shaft core position of the rotor 2 measured by the two vibrometers 81 is the change in each diagonal direction. Therefore, the change in shaft core position measured by the two vibrometers 81 is converted into the change in shaft core position in the up-down direction and the change in shaft core position in the left-right direction, respectively.

[0119] On the other hand, for example, there may be cases where the bearing 4 is a load-on-pad type bearing and the upper half of the bearing 4 is removed together with the vibrometer 81 in order to install a fixing wedge, or where the vibrometer 81 is not installed on the bearing 4. In such cases, as shown in Fig. 24, a displacement sensor 82 for detecting the amount of displacement of the rotor 2 may be installed near the bearing 4 of the rotor 2, and this displacement sensor 82 may be used as the shaft core position measuring device 80. In other words, the amount of change in the shaft core position of the rotor 2 may be measured by this displacement sensor 82.

[0120] A plurality of displacement sensors 82 may be provided so as to measure the amount of change in the shaft position of the rotor 2 in the vertical direction and the horizontal direction in the bearing 4, respectively. In the example shown in Fig. 24, the displacement sensors 82 are provided on one side in the horizontal direction (the left side in Fig. 24) and one side in the vertical direction (the upper side in Fig. 24). In the example shown in Fig. 24, the displacement sensor 82 is provided directly above the bearing 4. Moreover, the displacement sensor 82 is fixed onto the bearing 4 by a fixing jig 83. These two displacement sensors 82 measure the amount of change in the shaft position in the vertical direction and the amount of change in the shaft position in the horizontal direction, respectively.

[0121] The data correction process is performed after the data acquisition process. In the data correction process, the data acquired by the laser measurement device 30 is corrected based on the measured change in the axial position of the rotor 2, and the center difference X and the face opening amount Y between the couplings 3 when the rotor 2 is stopped are calculated. The data correction process may be performed by a calculation device (not shown).

[0122] A method of correcting data in the data correction step will be described. As shown in Fig. 25, it is assumed that the rotor 2a is supported by two bearings 4a and 4b, and the rotor 2b is supported by two bearings 4c and 4d. In this case, the influence of the change in the axial position of the rotor 2 in each of the bearings 4a, 4b, 4c, and 4d on the center difference X and the face opening amount Y between the couplings 3 can be calculated in advance.

[0123] FIG. 25 is a schematic diagram showing the relationship between the amounts of change V1, V2, V3, and V4 in the axial position of the rotor 2 in the left-right direction for each of the bearings 4a, 4b, 4c, and 4d and the center differences X1, X2, X3, and X4 and the surface opening amounts Y1, Y2, Y3, and Y4 between the couplings 3 in the left-right direction.

[0124] FIG. 25(a) shows that when the change amount of the axis position of the rotor 2 in the left-right direction at the bearing 4a is V1, the center difference in the left-right direction is X1, and the surface opening amount in the left-right direction is Y1. FIG. 25(b) shows that when the change amount of the axis position of the rotor 2 in the left-right direction at the bearing 4b is V2, the center difference in the left-right direction is X2, and the surface opening amount in the left-right direction is Y2. FIG. 25(c) shows that when the change amount of the axis position of the rotor 2 in the left-right direction at the bearing 4c is V3, the center difference in the left-right direction is X3, and the surface opening amount in the left-right direction is Y3. FIG. 25(d) shows that when the change amount of the axis position of the rotor 2 in the left-right direction at the bearing 4d is V4, the center difference in the left-right direction is X4, and the surface opening amount in the left-right direction is Y4. Although not shown, the same applies to the up-down direction.

[0125] As shown in FIG. 25, the relationship between the amount of change in the axial center position of the rotor 2 in each bearing 4 and the center difference X and face opening amount Y between the couplings 3 can be calculated from design values ​​such as the distance between the bearings 4, the distance between the bearings 4 and the couplings 3, and the outer diameter of the coupling.

[0126] Here, in the above-mentioned shaft core position change amount measuring process, the amount of change in shaft core position of the rotor 2 in the up-down direction and the left-right direction at each bearing 4 when the rotor 2 is continuously rotated is measured. Therefore, from the measured amount of change in shaft core position of the rotor 2, the amount of influence I on the core difference X and the face opening amount Y between the couplings 3 caused by the continuous rotation of the rotor 2 can be calculated. For example, it is assumed that the amount of change in shaft core position of the rotor 2 in the left-right direction measured at each bearing 4a, 4b, 4c, and 4d are V1, V2, V3, and V4, respectively. In this case, the amount of influence I on the core difference X in the left-right direction is X1+X2+X3+X4, and the amount of influence I on the face opening amount Y in the left-right direction is Y1+Y2+Y3+Y4.

[0127] In the data correction process, the data obtained by the laser measurement device 30 is corrected by subtracting this influence amount I from the data. That is, the influence amounts I in the up-down and left-right directions are subtracted from the center difference X and the face opening amount Y in the up-down and left-right directions obtained by the laser measurement device 30. This makes it possible to eliminate the influence of the continuous rotation of the rotor 2 from the measurement data and to calculate the center difference X and the face opening amount Y between the couplings 3 when the rotor 2 is stopped.

[0128] As described above, according to this embodiment, the data acquired by the laser measurement device 30 is corrected based on the measured change in the axial center position of the rotor 2, and the center difference X and the face opening amount Y between the couplings 3 when the rotor 2 is stopped are calculated. The center difference X and the face opening amount Y between the couplings 3 are used for rotor alignment adjustment, but the rotor alignment adjustment is generally performed when the rotor 2 is stopped. The data acquired by the laser measurement device 30 as described above is the center difference X and the face opening amount Y between the couplings 3 when the rotor 2 is continuously rotating, so that the data includes the influence of the continuous rotation of the rotor 2. That is, the data acquired by the laser measurement device 30 includes the influence amount I of the center difference X and the face opening amount Y caused by the change in the axial center position of the rotor 2 during the continuous rotation of the rotor 2. In contrast, according to this embodiment, the data acquired by the laser measurement device 30 is corrected based on the change in the axial center position of the rotor 2 when the rotor 2 is continuously rotated, so that the influence of the continuous rotation of the rotor 2 can be eliminated from the measurement data. This makes it possible to calculate the center difference X and the face opening amount Y between the couplings 3 when the rotor 2 is stopped. This makes it possible to further improve the measurement accuracy of the centering measurement, thereby enabling rotor alignment adjustment to be performed more accurately and in a shorter time.

[0129] (Seventh embodiment) Next, a rotor alignment adjustment assisting method according to a seventh embodiment will be described with reference to FIG.

[0130] The seventh embodiment shown in Fig. 26 differs mainly in that the calculated core misalignment and surface opening between the couplings and their design values ​​are displayed on a display device. The other configurations are substantially the same as those of the first embodiment shown in Figs. 10 to 18. In Fig. 26, the same parts as those of the first embodiment shown in Figs. 10 to 18 are given the same reference numerals and detailed description thereof will be omitted.

[0131] In this embodiment, the centering error X and the face opening amount Y between the couplings 3 calculated by the rotor centering measurement method according to the above-mentioned sixth embodiment, and their design values ​​are displayed on a display device 90. The display on the display device 90 may be performed by a control device (not shown).

[0132] An example of a screen displayed on the display device 90 is shown in Fig. 26. As shown in Fig. 26, the calculated center difference and surface opening amount between the couplings (calculation results) and their design values ​​may be displayed in the form of a graph. Fig. 26(a) is a graph showing the calculated center difference between the couplings, with the vertical axis showing the center difference in the up-down direction and the horizontal axis showing the center difference in the left-right direction. Fig. 26(b) is a graph showing the calculated surface opening amount between the couplings, with the vertical axis showing the surface opening amount in the up-down direction and the horizontal axis showing the surface opening amount in the left-right direction.

[0133] In the graphs of FIG. 26(a) and FIG. 26(b), reference numeral 91 indicates the calculation result, and reference numeral 92 indicates the design value. Reference numeral 93 indicates the range of the design tolerance. In this manner, the range of the design tolerance 93 may also be displayed on the display device 90. Reference numeral 94a indicates the calculated deviation amount of the core difference in the vertical direction from the design value, and reference numeral 94b indicates the calculated deviation amount of the core difference in the horizontal direction from the design value. Reference numeral 95a indicates the calculated deviation amount of the face opening amount in the vertical direction from the design value, and reference numeral 95b indicates the calculated deviation amount of the face opening amount in the horizontal direction from the design value. In this manner, the deviation amounts 94a, 94b, 95a, and 95b of the calculation results from the design value may also be displayed on the display device 90.

[0134] As described above, according to this embodiment, the calculated center difference X and face opening amount Y between the couplings 3 and their design values ​​92 are displayed on the display device 90. This allows the center difference X and face opening amount Y between the couplings 3 and their design values ​​92 to be visually confirmed, and an on-site worker can perform rotor alignment adjustment work while looking at the display. This improves the convenience of on-site work, and allows rotor alignment adjustment to be performed more accurately and in a shorter time.

[0135] (Eighth embodiment) Next, a rotor alignment adjustment assisting method according to an eighth embodiment will be described with reference to FIG.

[0136] The eighth embodiment shown in Fig. 27 differs mainly in that an estimated adjustment amount for the position of one of two rotors, with the other rotor as a reference, is displayed on a display device based on the calculated center misalignment and face opening amount between the couplings. The other configurations are substantially the same as those of the first embodiment shown in Figs. 10 to 18. In Figs. 26 and 27, the same parts as those of the first embodiment shown in Figs. 10 to 18 are given the same reference numerals and detailed description thereof will be omitted.

[0137] In this embodiment, based on the center difference X and the face opening amount Y between the couplings 3 calculated by the rotor centering measurement method according to the above-mentioned sixth embodiment, an estimated adjustment amount for the position of one rotor 2a of the two rotors 2, based on one rotor 2b, the other rotor 2b, is displayed on a display device 90. The display on the display device 90 may be performed by a control device (not shown).

[0138] An example of a screen displayed on the display device 90 is shown in Fig. 27. As shown in Fig. 27, the estimated amount of adjustment of the position of the rotor 2a may be displayed together with a schematic diagram of each of the rotors 2a, 2b. Fig. 27(a) shows a schematic diagram of each of the rotors 2a, 2b in the up-down direction and the estimated amount of adjustment of the rotor 2a. Fig. 27(b) shows each of the rotors 2a, 2b and the estimated amount of adjustment of the rotor 2a in the left-right direction.

[0139] In Fig. 27(a), reference numeral 96a denotes an estimated amount of adjustment of the rotor 2a in the vertical direction at the bearing 4a, and reference numeral 96b denotes an estimated amount of adjustment of the rotor 2a in the vertical direction at the bearing 4b. Also, in Fig. 27(b), reference numeral 97a denotes an estimated amount of adjustment of the rotor 2a in the left-right direction at the bearing 4a, and reference numeral 97b denotes an estimated amount of adjustment of the rotor 2a in the left-right direction at the bearing 4b.

[0140] The estimated adjustment amounts 96a, 96b, 97a, and 97b are adjustment amounts of the rotor 2 in the bearings 4a and 4b estimated for adjusting the position of the rotor 2 to the design value in rotor alignment adjustment. The estimated adjustment amounts 96a, 96b, 97a, and 97b can be calculated from the deviation between the current position of the rotor 2a calculated based on the calculated center difference X and face opening amount Y between the couplings 3 and the position of the rotor 2a according to the design value.

[0141] As described above, according to this embodiment, the estimated amount of adjustment for the position of one of the two rotors 2, rotor 2a, relative to rotor 2b, is displayed on the display device 90 based on the calculated center misalignment and surface opening amount between the couplings 3. This allows the estimated amount of adjustment for the position of rotor 2a to be visualized, and field workers can perform rotor alignment adjustment work while looking at the display. This improves the convenience of field work, and allows rotor alignment adjustment to be performed more accurately and in a shorter time.

[0142] The above-described embodiments may be combined as appropriate.

[0143] According to the embodiment described above, rotor alignment can be performed with high accuracy and in a short time.

[0144] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0145] 1: rotor system, 2, 2a, 2b: rotor, 3, 3a, 3b: coupling, 3c: bolt hole, 4, 4a, 4b, 4c, 4d: bearing, 20: rotor centering measuring device, 30: laser measuring device, 40: connecting pin, 43: protective tube, 44: spacer, 70: axial movement restricting device, 75: left-right movement restricting device, 81: vibration meter, 82: displacement sensor, 90: display device, X: center difference, Y: face opening amount

Claims

1. A rotor centering measurement method for measuring a centering error and a surface gap between the couplings of two rotors in a rotor system including two rotors connected via respective couplings, comprising: a laser measuring device is provided on the couplings of the two rotors to measure a relative position of one of the couplings from the other of the couplings; A rotor centering measurement method, comprising: acquiring data relating to the centering error and face opening amount between the couplings by the laser measurement device while continuously rotating both of the two rotors.

2. The couplings of the two rotors are connected by inserting a connecting pin into a bolt hole of the coupling, 2. The rotor centering measurement method according to claim 1, wherein the data is acquired by the laser measurement device while the two rotors connected via the connecting pin are rotated continuously together.

3. The couplings of the two rotors are connected by a plurality of the connecting pins, The rotor centering measurement method according to claim 2 , wherein the plurality of connecting pins are inserted into the bolt holes of the coupling at equal intervals in the circumferential direction.

4. The rotor centering measurement method according to claim 2 , further comprising a protective cylinder arranged on an outer circumferential surface of the connecting pin to protect the bolt hole.

5. The rotor centering measurement method according to claim 1 , further comprising the step of: disposing a spacer between the couplings of the two rotors.

6. 2. The rotor centering measurement method according to claim 1, further comprising an axial movement restriction device for restricting axial movement of the coupling.

7. 2. The rotor centering measurement method according to claim 1, further comprising a lateral movement restriction device for restricting lateral movement of the rotor.

8. measuring an amount of change in an axial position of the rotor when the rotor is continuously rotated; 2. The rotor centering measurement method according to claim 1, further comprising the steps of: correcting the data acquired by the laser measurement device based on an amount of change in the measured axial center position of the rotor; and calculating a center error and a face opening amount between the couplings when the rotor is stopped.

9. 9. The rotor centering measurement method according to claim 8, wherein the amount of change in the axial center position of the rotor is measured by a vibrometer installed in a bearing of the rotor.

10. a displacement sensor for detecting a displacement amount of the rotor is installed near a bearing of the rotor; 9. The rotor centering measurement method according to claim 8, wherein the amount of change in the axial center position of the rotor is measured by the displacement sensor.

11. A rotor alignment adjustment support method, comprising the steps of: displaying, on a display device, the centering error and the face opening amount between the couplings calculated by the rotor centering measurement method according to claim 8, and their design values.

12. 9. A rotor alignment adjustment support method, comprising: displaying, on a display device, an estimated amount of adjustment for the position of one of the two rotors, based on the centering error and face opening amount between the couplings calculated by the rotor centering measurement method according to claim 8.

13. A rotor centering measurement device for measuring a centering error and a surface gap amount between the couplings of two rotors in a rotor system including two rotors connected via respective couplings, comprising: a laser measurement device that is installed on the couplings of the two rotors and measures a relative position of one of the couplings from the other of the couplings; a connecting pin that connects the couplings of the two rotors by being inserted into a bolt hole of the coupling, The laser measurement device is a rotor centering measurement device that acquires data regarding the center error and face opening amount between the couplings while the two rotors connected via the connecting pin are continuously rotating together.

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