A method for processing the disc and center axis of a suspended hydroelectric generator set

Abstract

The application provides a suspension type water turbine generator set disc turning and center axis processing method, which comprises unit center adjustment, adopts a bottom-up mode to adjust and position the unit center, i.e. first fixes the runner by using a wedge plate, coarsely adjusts to the geometric center, then uses an upper guide to push the center, a lower guide to follow the center and force fine adjustment to complete the unit center adjustment; after the unit center adjustment is completed, the disc turning is carried out by using an elastic disc turning mode, the generator shaft is in a forced vertical state by adopting a mode of simultaneously holding the upper guide and the lower guide, at this time, the perpendicularity of the main shaft is reflected by the inclination value of the lower guide and the upper guide, the perpendicularity of the main shaft and the mirror plate is reflected by the axial swing of the mirror plate and the level, and the broken line of the water turbine main shaft is reflected by the inclination value of the water guide and the flange. The application effectively reduces the mutual influence in the process of unit axis processing, force, center and level adjustment, simplifies the operation steps, greatly simplifies the axis processing process, saves time and manpower, and is more universal.

Description

Technical Field

[0001] This invention belongs to the field of turning gear technology for hydro-turbine generator sets, specifically relating to a method for turning gear and center axis treatment of a suspended hydro-turbine generator set. Background Technology

[0002] The Longma Hydropower Station's generating units are long-shaft suspended units with elastic oil tank thrust bearings and upper guide bearings located below the thrust bearings. It is a transitional type of unit. The main shaft is a segmented mechanism, consisting of a generator shaft and a turbine shaft.

[0003] Inspection and testing revealed that the flexible oil tank was too soft, and the unit's shaft system was too long (8370mm). For this type of long-shaft suspended unit with a flexible oil tank, various factors such as the center of the rotating parts, level, force, and the performance of the flexible oil tank can cause dynamic tilting of the shaft during the turning process. Furthermore, center adjustment before turning is extremely difficult. The center adjustment of the suspended unit uses a leak-proof ring to determine the unit's center (in short: the idea is to determine the center from bottom to top, and the method is to adjust the center from top to bottom). Center adjustment is divided into coarse adjustment and fine adjustment. The purpose of coarse adjustment is to ensure conditions are met for turning, avoid scraping during turning, and push the shaft to its geometric center before turning. The purpose of fine-tuning is to align the rotation center of the unit with the center of the leak-stop ring. Conventional adjustment methods calculate the rotation center of the unit by oscillation, then calculate the clearance values ​​of the leak-stop ring in each direction, and adjust by pushing the upper guide as the main method and the lower guide as the auxiliary method, while monitoring the level of the mirror plate, and then checking and measuring the gap of the leak-stop ring to see if it meets the requirements. This top-down adjustment method has no problem in the adjustment of conventional units, but it is time-consuming and laborious to adjust the center of the Longma unit, and it is difficult to adjust it to the center position. Summary of the Invention

[0004] This invention provides a method for turning and center axis treatment of a suspended hydro-generator unit, which effectively reduces the mutual influence of the unit's axis treatment, stress, center and level adjustment processes, simplifies the operation steps, saves time, and is more universal.

[0005] The technical solution of this invention is: a method for turning the suspended hydro-generator unit and processing the center axis, including...

[0006] Step 1: Unit center adjustment. The unit center is adjusted and positioned from bottom to top. First, the wheel is fixed with wedge plates and roughly adjusted to the geometric center. Then, the center is pushed with the upper guide and the center and force are followed by the lower guide to complete the unit center adjustment.

[0007] Step 2: After the unit center adjustment is completed, the generator shaft is rotated using the flexible turning method. The upper and lower guides are simultaneously engaged to force the generator shaft into a vertical state. At this time, the verticality of the main shaft is reflected by the tilt value of the lower and upper guides. The verticality of the main shaft and the mirror plate is reflected by the axial swing and horizontality of the mirror plate. The broken line of the water generator shaft is reflected by the tilt value of the water guide and flange.

[0008] The bottom-up approach to adjusting the center of the positioning unit in step one above specifically includes:

[0009] 1. During the pre-assembly of the unit, measure the coaxiality of the geometric center of the unit's fixed leak-proof ring, upper frame, lower frame, and stator, and adjust them to meet the requirements. Record the position of the upper and lower guide shafts at this time, which will serve as an important basis for the later adjustment of the unit's center and the verticality of the generator shaft.

[0010] 2. Measure the gap of the turbine runner's sealing ring, calculate the unit's rotation center through the swing, and then calculate the gap value of the sealing ring in each position. Adjust the unit's center according to the gap value so that the runner's rotation center coincides with the geometric center of the sealing ring. Drive wedges into the turbine's sealing ring at four positions at 90° intervals to prevent the runner's center position from changing during the forced verticalization of the shaft.

[0011] 3. Set up a level on the mirror plate, and adjust the position of the generator main shaft to the center of the shaft by adjusting the upper guide bearing and the lower guide bearing according to the position of the upper guide bearing, so that the generator shaft is forced to be vertical.

[0012] 4. After the upper and lower guide plates are secured to the shaft, remove the wedge plate at the leak-proof ring of the impeller and observe that the dial gauge at the water guide should show no change.

[0013] 5. Record the values ​​at the guide flange by rotating the machine, analyze and calculate the broken line value at the flange, and adjust it by adding shims;

[0014] 6. Adjust the perpendicularity between the generator shaft and the mirror plate according to the horizontal and axial runout values ​​of the mirror plate;

[0015] 7. Calculate the amount and orientation of padding based on the axis, mirror plate runout value, and horizontal analysis, and perform centering by adding padding.

[0016] The specific process of center and force fine-tuning in step one above includes:

[0017] 1. Since the gap at the runner sealing ring has changed after the main shaft is treated, loosen the upper and lower guide bearings, adjust the unit center according to the runner sealing ring gap value and the runner swing value at this point, so that the runner is back in the center position, and drive wedges into the four 90° positions at the turbine sealing ring.

[0018] 2. Set up a level on the mirror plate, and adjust the center position of the generator main shaft by adjusting the upper guide bearing and following the lower guide bearing, so that the generator shaft is forced to be vertical;

[0019] 3. After the upper and lower guide plates are secured to the shaft, remove the wedge plate at the leak-proof ring of the impeller and observe that the dial gauge at the water guide should show no change.

[0020] 4. The spindle is adjusted in a forced vertical state. Under the monitoring of a dial indicator, the upper and lower guide bearings hold the spindle throughout the entire adjustment process.

[0021] 5. Lift the rotor and unscrew the protective sleeve of the elastic oil tank, leaving a 5mm gap at the bottom. Set up dial indicators on both sides of the outer ring of each elastic oil tank, lower the rotor, record the reading of each dial indicator, and calculate the compression value of each elastic oil tank. The deviation of each compression value should meet the design requirements as much as possible. If the deviation exceeds the design, adjust the force to the qualified level through the adjustment ring on the top of the elastic oil tank.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. The unit center is determined by a bottom-up method. First, the wheel is fixed with wedge plates and roughly adjusted to the geometric center. Then, the center is pushed with the upper guide and followed by the lower guide. This "forced vertical method" is used to determine the unit center, which saves time and effort. This method can be completed in just 2 days by 30 people.

[0024] 2. Using forced vertical elastic turning: First, push the rotor to the center and fix it with wedge plates. Then, set up a level on the mirror plate. According to the position of the upper guide shaft, adjust the position of the main shaft of the unit to the center of the shaft by adjusting the upper guide bearing and the lower guide bearing, so that the generator shaft is forced vertical. Remove the wedge plates and ensure that the reading of the dial gauge monitoring the displacement at the water guide remains basically unchanged. Perform elastic turning. This method only requires 1 day and 30 people to adjust the center to the required standard.

[0025] 3. The forced vertical flexible turning effectively reduces the mutual interference in the handling, stress, centering, and leveling of the generator shaft. After forced verticality, the generator shaft tilt problem can be eliminated, leaving only the bend at the water-generator coupling flange, reducing the possibility of the sealing ring rubbing. Once the impeller center is adjusted, it basically does not affect the turning, simplifying complex problems, streamlining operation steps, saving time, and making it more universal. The forced vertical flexible turning can accurately and quickly determine the generator shaft tilt value and the main shaft flange break line value through the mirror plate runout value and the water guide swing value. At the same time, the generator shaft tilt and flange break line are processed separately according to the corresponding data without affecting each other, greatly simplifying the shaft handling process and saving time.

[0026] 4. The axis and center processing can be completed in about 3 days by 30 people, saving about 3 days' worth of work for 30 people. Detailed Implementation

[0027] The present invention will now be described clearly and completely so that those skilled in the art can fully implement the invention without requiring inventive effort.

[0028] The specific embodiment of the present invention is: a method for turning and center axis treatment of a suspended hydro-generator unit, including...

[0029] Step 1: Unit center adjustment. The unit center is adjusted and positioned from bottom to top. First, the wheel is fixed with wedge plates and roughly adjusted to the geometric center. Then, the center is pushed with the upper guide and the center and force are followed by the lower guide to complete the unit center adjustment.

[0030] Step 2: After the unit center adjustment is completed, the generator shaft is rotated using the flexible turning method. The upper and lower guides are simultaneously engaged to force the generator shaft into a vertical state. At this time, the verticality of the main shaft is reflected by the tilt value of the lower and upper guides. The verticality of the main shaft and the mirror plate is reflected by the axial swing and horizontality of the mirror plate. The broken line of the water generator shaft is reflected by the tilt value of the water guide and flange.

[0031] The bottom-up approach to adjusting the center of the positioning unit in step one above specifically includes:

[0032] 1. During the pre-assembly of the unit, measure the coaxiality of the geometric center of the unit's fixed leak-proof ring, upper frame, lower frame, and stator, and adjust them to meet the requirements. Record the position of the upper and lower guide shafts at this time, which will serve as an important basis for the later adjustment of the unit's center and the verticality of the generator shaft.

[0033] 2. Measure the gap of the turbine runner's sealing ring, calculate the unit's rotation center through the swing, and then calculate the gap value of the sealing ring in each position. Adjust the unit's center according to the gap value so that the runner's rotation center coincides with the geometric center of the sealing ring. Drive wedges into the turbine's sealing ring at four positions at 90° intervals to prevent the runner's center position from changing during the forced verticalization of the shaft.

[0034] 3. Set up a level on the mirror plate, and adjust the position of the generator main shaft to the center of the shaft by adjusting the upper guide bearing and the lower guide bearing according to the position of the upper guide bearing, so that the generator shaft is forced to be vertical.

[0035] 4. After the upper and lower guide plates are secured to the shaft, remove the wedge plate at the leak-proof ring of the impeller and observe that the dial gauge at the water guide should show no change.

[0036] 5. Record the values ​​at the guide flange by rotating the machine, analyze and calculate the broken line value at the flange, and adjust it by adding shims;

[0037] 6. Adjust the perpendicularity between the generator shaft and the mirror plate according to the horizontal and axial runout values ​​of the mirror plate;

[0038] 7. Based on the axis and mirror plate runout values, and horizontal analysis, calculate the amount and azimuth of shims. Perform centering processing using shims. The processed turning data is as follows:

[0039]

[0040]

[0041] The specific process of center and force fine-tuning in step one above includes:

[0042] 1. Since the gap at the runner sealing ring has changed after the main shaft is treated, loosen the upper and lower guide bearings, adjust the unit center according to the runner sealing ring gap value and the runner swing value at this point, so that the runner is back in the center position, and drive wedges into the four 90° positions at the turbine sealing ring.

[0043] 2. Set up a level on the mirror plate, and adjust the center position of the generator main shaft by adjusting the upper guide bearing and following the lower guide bearing, so that the generator shaft is forced to be vertical;

[0044] 3. After the upper and lower guide plates are secured to the shaft, remove the wedge plate at the leak-proof ring of the impeller and observe that the dial gauge at the water guide should show no change.

[0045] 4. The spindle is adjusted in a forced vertical state. Under the monitoring of a dial indicator, the upper and lower guide bearings hold the spindle throughout the entire adjustment process.

[0046] 5. Lift the rotor and unscrew the protective sleeve of the elastic oil tank, leaving a 5mm gap at the bottom. Set up dial indicators on both sides of the outer ring of each elastic oil tank, lower the rotor, record the reading of each dial indicator, and calculate the compression value of each elastic oil tank. The deviation of each compression value should meet the design requirements as much as possible. If the deviation exceeds the design, adjust the force to the qualified level through the adjustment ring on the top of the elastic oil tank.

[0047] The "forced verticality method" of this invention effectively reduces the mutual influence of the generator shaft handling, stress, centering, and leveling processes. After forced verticality, the generator shaft tilt problem can be eliminated, leaving only the bend at the water-generator coupling flange, reducing the possibility of the leak-proof ring rubbing against the shaft. Once the impeller center is adjusted, it basically does not affect the turning gear, simplifying complex problems, streamlining operation steps, saving time, and making it more universal. The elastic turning gear with forced verticality can accurately and quickly determine the generator shaft tilt value and the main shaft flange break line value through the mirror plate runout value and the water guide swing value. At the same time, the generator shaft tilt and flange break line are processed separately according to the corresponding data, without affecting each other, greatly simplifying the shaft handling process and saving time.

[0048] The preferred embodiments of the present invention have been described above. It should be noted that the present invention is not limited to the specific embodiments described above. The devices and structures not described in detail should be understood to be implemented in the ordinary way in the art. Any simple modifications, equivalent changes and modifications made by any person skilled in the art to the above embodiments based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A method for turning the turbine and processing the center axis of a suspended hydro-generator unit, characterized in that, include Step 1: Unit Center Adjustment. The unit center is adjusted from bottom to top. First, the runner is fixed with wedges and roughly adjusted to the geometric center. Specifically, during unit pre-assembly, the coaxiality of the geometric centers of the unit's fixing leak-proof ring, upper frame, lower frame, and stator is measured and adjusted to meet the requirements. The positions of the upper and lower guide shafts at this time are recorded as important bases for later adjustments to the unit center and generator shaft perpendicularity. The gap of the turbine runner's leak-proof ring is measured, and the unit's rotation center is calculated through the runout. Then, the gap values ​​of the leak-proof ring in each position are calculated. The unit center is adjusted according to the gap values ​​to ensure that the runner's rotation center and the leak-proof ring are aligned. The geometric centers of the leak rings coincide. Wedges are driven into the turbine's leak-stop ring at four mutually perpendicular positions (90° each) to prevent the turbine's center position from changing during the forced verticalization of the generator shaft. A level is installed on the mirror plate. Based on the upper guide shaft position, the main shaft of the unit is adjusted to the shaft center using the upper guide bearing as the main adjustment and the lower guide bearing as the follow-up adjustment, forcing the generator shaft vertical. After the upper and lower guide bearings are engaged with the shaft, the wedges at the turbine's leak-stop ring are removed, and the dial indicator at the water guide should show no change. The values ​​at the lower guide-flange are recorded by rotating the turbine, and the broken line value at the flange is calculated and adjusted by adding shims. The perpendicularity of the generator shaft to the mirror plate is adjusted based on the mirror plate's horizontal and axial runout values. The amount and orientation of shims are calculated based on the axis and mirror plate runout values ​​and the horizontal analysis, and the center is adjusted by adding shims. Next, the unit center is adjusted using the upper guide shoe pushing the center and the lower guide shoe following the center, along with fine-tuning the force. Specifically, since the gap at the runner's leak-proof ring has changed after the main shaft treatment, the upper and lower guide shoes are loosened. The unit center is adjusted according to the runner's leak-proof ring gap value and the runner's swing value, so that the runner is back in the center position. Wedges are driven into the turbine's leak-proof ring at four mutually 90° positions. A level is set up on the mirror plate, and the unit's main shaft center is adjusted by adjusting the upper guide shoe as the main adjustment and the lower guide shoe following the adjustment. Position the generator shaft so that it is forced vertically; after the upper and lower guide bearings are engaged with the shaft, remove the wedge plate at the runner's leak-proof ring and observe that the dial indicator at the water guide should show no change; lift the rotor, unscrew the protective sleeve of the elastic oil tank, leaving a 5mm gap at the bottom, set up dial indicators on both sides of the outer ring of each elastic oil tank, lower the rotor, record the reading of each dial indicator, calculate the compression value of each elastic oil tank, and the deviation of each compression value should meet the design requirements. If the deviation exceeds the design, adjust the force to the qualified level through the adjustment ring at the top of the elastic oil tank; Step 2: After the unit center adjustment is completed, the generator shaft is rotated using the flexible turning method. The upper and lower guides are simultaneously engaged to force the generator shaft into a vertical state. At this time, the verticality of the main shaft is reflected by the tilt value of the lower and upper guides. The verticality of the main shaft and the mirror plate is reflected by the axial swing and horizontality of the mirror plate. The broken line of the water generator shaft is reflected by the tilt value of the water guide and flange.

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