Method for adjusting the center of motor support and motor of nuclear power plant shaft seal nuclear main pump

Abstract

The present application relates to a kind of nuclear power station shaft seal nuclear main pump motor support and the center adjustment method of motor, the rotation of centering device is replaced by the rotation of motor rotor, the rotation of the outer ring of centering device can be regarded as motor rotor rotation, according to the reading of the measuring table on centering device, to determine the direction of pushing motor, realize the coaxiality of the outer ring of centering device and bearing chamber inner circle meets the requirements, by the way of reference transmission, i.e., motor rotor and bearing chamber inner circle are coaxial, i.e., the center of motor and nuclear main pump motor support are coaxial, to determine the position of nuclear main pump motor support and the center of motor. The process method of the present application has high accuracy and high efficiency, avoids the occurrence of bushing wear and other situations due to inaccurate adjustment position during operation, thereby also reducing the vibration value. With the centering device, the situation of bushing wear caused by dry grinding between thrust disc and bushing during the adjustment process will not occur, avoiding losses and hidden dangers.

Description

TECHNICAL FIELD

[0001] The application relates to a center adjustment method for a motor support and a motor of a shaft seal nuclear main pump. BACKGROUND

[0002] A center adjustment method for a motor support and a motor of a shaft seal nuclear main pump in a nuclear power station shaft seal main pump manufacturing plant is a key to normal operation of the shaft seal nuclear main pump, and if the center adjustment is not accurate enough, the main pump may vibrate excessively and the bushing may be damaged, so that the nuclear main pump cannot operate normally, and a serious accident may occur. The center adjustment of the motor support and the motor of the shaft seal nuclear main pump in the nuclear power station shaft seal main pump manufacturing plant is a key process and a core process in main pump assembly, and is particularly important for domestic production of the shaft seal nuclear main pump. The accuracy of the center adjustment of the motor support and the motor of the shaft seal nuclear main pump has been an international technical problem. Currently, at least four people are arranged on the upper part of the motor, a tool with a long rod is connected to the motor shaft, and the long rod is used to drive the motor rotor to rotate. This method has the following disadvantages. First, the motor rotor weighs about 20 tons, so it is very difficult to drive the rotor to rotate, and high-altitude operation on the motor also brings certain risks. Second, when the motor rotor rotates, the thrust disc on the motor rotor and the bushing generate sliding friction, at this time, the oil supply system cannot be started, the thrust disc and the bushing are easily dry ground, and the bushing is damaged, which causes losses and hidden dangers. Third, the motor rotor needs to rotate at the center of the stator, otherwise the reading of the measuring table is inaccurate. Because the rotor is too heavy, it is difficult to keep the rotor at the center of the electronic stator. During this process, the rotor position changes frequently, which causes inaccurate values and affects the overall operation of the main pump unit, resulting in excessive vibration. Therefore, the main pump unit needs to be disassembled and reassembled, which consumes a lot of time for adjustment and increases the difficulty of operation for workers. SUMMARY

[0003] The application aims to disclose a center adjustment method for a motor support and a motor of a shaft seal nuclear main pump of a nuclear power station, which has high precision and high adjustment efficiency. The technical scheme of the application is as follows.

[0004] 1) The motor support (1) is placed on the tool support (2), four adjusting plates (4) are fixed on the motor support (1) by two first bolts (3) respectively, and one adjusting plate (4) is installed every 90 degrees.

[0005] 2) The protective sleeve (5) is installed at the lower end of the motor rotor (6), the motor (7) is placed on the motor support (1) through the guide of the adjusting plate (4), and the protective sleeve (5) at the lower end of the motor rotor (6) is removed.

[0006] 3) Screw rod (8) is equipped at the lower end of motor rotor (6), alignment device (9) is installed at the lower end of motor rotor (6), nut (10) is equipped at screw rod (8) for fixing alignment device (9), first magnetic attraction measuring gauge (11) and second magnetic attraction measuring gauge (12) are fixed at two measuring gauge bases (13) of alignment device (9) respectively, first magnetic attraction measuring gauge (11) measures the inner circle of lower bearing chamber (16), second magnetic attraction measuring gauge (12) measures the lower end surface of lower bearing chamber (16);

[0007] 4) Motor rotor (6) is placed in the center of motor (7), the center of motor (7) refers to the theoretical center of motor stator;

[0008] 5) The outer ring (14) of rotating alignment device (9) is rotated, the value displayed by first magnetic attraction measuring gauge (11) is S1, the reading of second magnetic attraction measuring gauge (12) is S2;

[0009] Wherein, the measured value of S1: S1 < 0.02mm

[0010] The measured value of S2: S2 < 0.02mm

[0011] 6) If the value displayed by S1 is not in the required range, adjust the position of motor (7) by rotating four second bolts (15) of adjusting plate (4) until it meets the requirements, if the value displayed by S2 is not in the required range, adjust the level of motor (7) until it meets the requirements, that is, the center adjustment is completed;

[0012] Alignment device (9) comprises inner ring (17) and outer ring (14), one rolling bearing ring (18) is installed at the upper end of inner ring (17) and the upper end of outer ring (14), another rolling bearing ring (18) is installed at the lower end of inner ring (17) and the lower end of outer ring (14), the upper end of inner ring (17) and the upper end of outer ring (14) and the lower end of inner ring (17) and the lower end of outer ring (14) are respectively installed two blocking rings (20) on outer ring (14) by sixteen third bolts (19), fourth bolt (21) fixes measuring gauge base (13) on outer ring (14), eight fifth bolts (22) fix connecting flange (23) on inner ring (17).

[0013] The upper end of inner ring (17) and the upper end of outer ring (14) and the lower end of inner ring (17) and the lower end of outer ring (14) clamp rolling bearing ring (18), outer ring (14) can rotate freely, alignment device (9) rotates instead of workpiece during center adjustment after being installed on workpiece.

[0014] Two measuring gauge bases (13) are installed on outer ring (14).

[0015] The process method and the aligning device (9) are applied to the position adjustment of the upper motor support and the sealing chamber.

[0016] The technical principle of the present application is as follows:

[0017] The position adjustment of the upper motor support and the motor center in the present application is actually the theoretical coincidence of the bearing chamber center in the upper motor support and the motor rotor center. First, the motor rotor is adjusted to the theoretical center position of the motor stator, that is, the center position of the motor in the present application. Then, the motor rotor and the motor are regarded as a whole, the lower end of the motor rotor is installed with the aligning device, the rotation of the outer ring of the aligning device replaces the rotation of the motor rotor, the rotation of the outer ring of the aligning device can be regarded as the rotation of the motor rotor, the direction of pushing the motor is determined according to the reading of the measuring table on the aligning device, the coaxiality of the outer ring of the aligning device and the inner circle of the bearing chamber is realized, the coaxiality of the motor center and the upper motor support of the nuclear main pump is realized through the reference transmission, and thus the position of the upper motor support of the nuclear main pump and the center of the motor is determined.

[0018] The technical effect of the present application is as follows:

[0019] The aligning device is creatively used to replace the rotation of the motor rotor in the process of adjusting the center of the upper motor support and the motor of the nuclear main pump, and the center of the upper motor support and the motor of the nuclear main pump is finally determined through the reference transmission, so as to determine the correct position of the upper motor support and the motor of the nuclear main pump. The process method of the present application has the following advantages. First, the danger caused by the overmuch personnel high-altitude operation to push the rotor to rotate is avoided, and one person can easily operate the aligning device at the lower part of the motor. The second advantage of the present application is that the method does not need the rotation of the motor rotor, the sliding friction between the thrust disc on the motor rotor and the bearing bush is avoided, the dry grinding of the thrust disc and the bearing bush is avoided, the damage and hidden danger are avoided, the third advantage of the present application is that the position of the motor rotor and the bearing chamber is fixed in the adjustment process, the position change caused by the rotation of the aligning device is avoided, the adjustment accuracy is improved, the re-adjustment and re-assembly caused by the unqualified adjustment are avoided, the risk of the excessive vibration of the whole operation of the main pump unit is reduced, the fourth advantage of the present application is that the method greatly improves the work efficiency, the original adjustment process needs one week, and the method can be completed in less than one day, the fifth advantage of the present application is that the method can also be applied to the position adjustment of the upper motor support and the sealing chamber of the nuclear main pump, one device has multiple purposes, the accuracy of the rotation center adjustment of the main pump is greatly improved, the work efficiency is improved, and the manufacturing cost is reduced, and the sixth advantage of the present application is that two measuring table bases are installed on the outer ring of the aligning device, the magnetic force table can be stably adsorbed, the radial and axial values can be displayed at the same time in the process engineering, and the effectiveness of the two values is determined at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Measurement diagram of measuring table

[0021] Figure 2 Diagram of upper motor support and motor adjustment state

[0022] Figure 3 Diagram of centering device structure DETAILED DESCRIPTION

[0023] When the shaft seal nuclear main pump unit is first assembled in the factory, without determining the center position of the upper motor support and the motor, the centering device installed on the motor rotor is used to adjust the position according to the readings of the measuring table on the centering device, so as to meet the position required for operation.

[0024] A center adjustment method of the upper motor support and the motor of a nuclear power plant shaft seal nuclear main pump, comprising the following steps:

[0025] As shown in Figure 2 1) the upper motor support 1 is placed on the tool support 2, and four adjusting plates 4 are fixed on the upper motor support 1 by using two first bolts 3 respectively, and one adjusting plate 4 is installed every 90°;

[0026] 2) the protective sleeve 5 is installed on the lower end of the motor rotor 6, the motor 7 is placed on the upper motor support 1 through the guidance of the adjusting plate 4, and the protective sleeve 5 on the lower end of the motor rotor 6 is removed;

[0027] As shown in Figure 1 3) the screw rod 8 is matched with the lower end of the motor rotor 6, the centering device 9 is installed on the lower end of the motor rotor 6, the nut 10 is matched with the screw rod 8 for fixing the centering device 9, the first magnetic attraction measuring table 11 and the second magnetic attraction measuring table 12 are fixed on the two measuring table bases 13 of the centering device 9 respectively, the first magnetic attraction measuring table 11 measures the inner circle of the lower bearing chamber 16, and the second magnetic attraction measuring table 12 measures the lower end surface of the lower bearing chamber 16;

[0028] 4) the motor rotor 6 is placed in the center of the motor 7, and the center of the motor 7 refers to the theoretical center of the stator of the motor;

[0029] 5) the outer ring 14 of the centering device 9 is rotated, the value displayed by the first magnetic attraction measuring table 11 is S1, and the reading of the second magnetic attraction measuring table 12 is S2;

[0030] Requirements: the measured value of S1 is S1 < 0.02 mm

[0031] The measured value of S2 is S2 < 0.02 mm

[0032] 6) If the value range displayed by S1 does not meet the requirements, adjust the position of motor 7 by rotating the four second bolts 15 of the adjustment plate 4 until it meets the requirements. If the value range displayed by S2 does not meet the requirements, adjust the level of motor 7 until it meets the requirements, thus completing the center adjustment.

[0033] like Figure 3 As shown, the self-aligning device 9 includes an inner ring 17 and an outer ring 14. A rolling bearing ring 18 is installed on the upper end of the inner ring 17 and the upper end of the outer ring 14, and another rolling bearing ring 18 is installed on the lower end of the inner ring 17 and the lower end of the outer ring 14. The upper end of the inner ring 17 and the upper end of the outer ring 14, and the lower end of the inner ring 17 and the lower end of the outer ring 14, respectively, are equipped with two retaining rings 20 on the outer ring 14 by sixteen third bolts 19. The fourth bolt 21 fixes the measuring instrument base 13 on the outer ring 14, and eight fifth bolts 22 fix the connecting flange 23 on the inner ring 17.

[0034] The upper end of the inner ring 17 and the upper end of the outer ring 14 clamp the rolling bearing ring 18. The outer ring 14 can rotate freely. After the self-aligning device 9 is installed on the workpiece, it rotates in place of the workpiece during the center adjustment process.

[0035] Two measuring instrument bases 13 are mounted on the outer ring 14.

[0036] This process and self-aligning device 9 are used to adjust the position of the upper motor support and the sealing chamber.

Claims

1. A method for adjusting the center of the motor support and the motor on the main pump of a nuclear power plant shaft seal, characterized in that: Includes the following steps: 1) The upper motor support (1) is placed on the tool bracket (2), and four adjusting plates (4) are fixed on the upper motor support (1) by two first bolts (3), with one adjusting plate (4) installed every 90°; 2) The protective sleeve (5) is installed at the lower end of the motor rotor (6), and the motor (7) is guided by the adjusting plate (4) to fall on the upper motor support (1). Remove the protective sleeve (5) at the lower end of the motor rotor (6). 3) The screw (8) is fitted at the lower end of the motor rotor (6), and the self-aligning device (9) is installed at the lower end of the motor rotor (6). The nut (10) is fitted on the screw (8) to fix the self-aligning device (9). The first magnetic attraction measuring instrument (11) and the second magnetic attraction measuring instrument (12) are respectively fixed on the two measuring instrument bases (13) of the self-aligning device (9). The first magnetic attraction measuring instrument (11) measures the inner circle of the lower bearing chamber (16), and the second magnetic attraction measuring instrument (12) measures the lower end face of the lower bearing chamber (16). 4) The motor rotor (6) is located at the center of the motor (7), and the center of the motor (7) refers to the theoretical center of the motor stator; 5) The outer ring (14) of the rotating self-aligning device (9) has a value of S1 displayed by the first magnetic attraction meter (11) and a reading of S2 displayed by the second magnetic attraction meter (12); The requirement is that the measured value of S1 is S1 < 0.02 mm. Measured value of S2: S2 < 0.02 mm 6) If the value range displayed by S1 does not meet the requirements, adjust the position of the motor (7) by rotating the four second bolts (15) of the adjustment plate (4) until it meets the requirements. If the value range displayed by S2 does not meet the requirements, adjust the level of the motor (7) until it meets the requirements, thus completing the center adjustment. The self-aligning device (9) includes an inner ring (17) and an outer ring (14). A rolling bearing ring (18) is installed on the upper end of the inner ring (17) and the upper end of the outer ring (14). Another rolling bearing ring (18) is installed on the lower end of the inner ring (17) and the lower end of the outer ring (14). The upper end of the inner ring (17) and the upper end of the outer ring (14) are respectively connected to two retaining rings (20) on the outer ring (14) by sixteen third bolts (19). The fourth bolt (21) fixes the measuring instrument base (13) on the outer ring (14). Eight fifth bolts (22) fix the connecting flange (23) on the inner ring (17).

2. The method for adjusting the center of the motor support and the motor on the main pump of a nuclear power plant shaft seal according to claim 1, characterized in that: The upper end of the inner ring (17) and the upper end of the outer ring (14) clamp the rolling bearing ring (18) with the upper end of the inner ring (17) and the lower end of the outer ring (14). The outer ring (14) can rotate freely. After the self-aligning device (9) is installed on the workpiece, it rotates in place of the workpiece during the center adjustment process.

3. The method for adjusting the center of the motor support and the motor on the main pump of a nuclear power plant shaft seal according to claim 1, characterized in that: Two measuring instrument bases (13) are mounted on the outer ring (14).

4. The method for adjusting the center of the motor support and the motor on the main pump of a nuclear power plant shaft seal according to claim 1, characterized in that: This process and self-aligning device (9) are used to adjust the position of the upper motor support and the sealing chamber.

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