A large rotor support reset concentricity adjusting structure and adjusting method thereof

Abstract

The application discloses a large rotor support resetting concentricity adjusting structure and an adjusting method thereof. The adjusting structure comprises a center body support pier, the inner side of the center body support pier is provided with a resetting guide key and a pile foundation plate, the outer side surface of the resetting guide key is a guide surface, and the pile foundation plate is provided with a horizontally moving jacking assembly. The adjusting method comprises the following steps: falling the rotor support, the rotor center body is guided by the resetting guide key and falls on the center body support pier; measuring the roundness of the magnetic yoke, calculating the center deviation; determining the adjusting direction, installing the jacking assembly in the pile foundation plate arranged in the center body support pier, and generating corresponding displacement of the inner side of the rotor center body by operating the jacking assembly. The application has the advantages of simple technical principle, high operability, high safety and reliability, and can effectively reduce the construction risk; moreover, the application has the advantages of low resource investment such as equipment, materials and manpower, low cost, high work efficiency, good economic benefit, and is especially suitable for the overall replacement and reconstruction of the disc type rotor support of a hydropower station.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of large disc type hydro-generator rotor support transformation, in particular to a large rotor support resetting concentricity adjusting structure and adjusting method. BACKGROUND

[0002] In a hydro-generator unit, the rotor support is an important component that connects the rotor yoke and the generator rotor shaft into one body, mainly bearing the comprehensive action of torque, gravity, self centrifugal force and thermal keying radial force in operation, and the stress is complex. The large hydro-generator rotor support generally adopts a disc type structure, which is composed of upper and lower discs, vertical rib plates and web plates by site assembly and welding, and is firmly connected into one body with the yoke through a composite key structure combined by multiple keys. Due to the large size of such large rotor support, local deformation is prone to occur after long-term high-speed operation, which brings great safety hazards to the stable operation of the generator. Considering that the overall replacement of the generator rotor has a long construction period and high economic cost, and the replacement of the rotor support while retaining the yoke is a more economical and efficient transformation mode.

[0003] In the conventional installation of large hydro-generator rotors, the site assembly and welding of the rotor support are completed first, and then the yoke is assembled on the rotor support. The rotor transformation mode of overall replacement of the rotor support retains the yoke, and the yoke becomes an "outer sleeve" that can be "put on and taken off" with the rotor support. After the original yoke is separated from the support, the new support cannot be reset immediately, and the yoke will be stationary for a long time, which is prone to deformation. When the new rotor support is reset and fitted, the concentricity positioning and adjustment will become more difficult. Therefore, to ensure that the new rotor support perfectly fits the original yoke after resetting and meets the design specified size deviation, the concentricity deviation between the new rotor support and the original yoke after resetting must be optimized.

[0004] In the prior art "Process method for replacing rotor support while retaining original yoke", application number 202011283931.9, the concentricity after the overall replacement of the rotor support is adjusted by removing the yoke keys and the rotor support, determining the center of the yoke using a center finder, setting a resetting stake on the yoke as a positioning point for the new rotor support, and using a rotor support resetting tool and a guide wedge plate to adjust the concentricity between the new rotor support and the original yoke during the resetting and fitting process. However, this method has a complex structure and is inconvenient to operate, which is not conducive to popularization and application. SUMMARY

[0005] The purpose of the present application is to provide a large rotor support resetting concentricity adjusting structure and adjusting method, which solves the problem of difficult positioning and adjustment of the concentricity between the transformed rotor support and the original yoke. The transformed rotor shape size meets the design deviation requirement and the technical requirement of yoke thermal pad after resetting.

[0006] The application achieves the purpose by the following technical scheme.

[0007] The large rotor support reset concentricity adjusting structure comprises a center body support pier, the inner side of the center body support pier is provided with a reset guide key and a pile foundation plate, the outer side surface of the reset guide key is a guide surface, the guide surface is matched with the inner side surface of the rotor center body, the pile foundation plate is provided with a horizontally moving jacking assembly, and the outer end of the jacking assembly is matched with the inner side surface of the rotor center body.

[0008] Further, the reset guide key is L-shaped.

[0009] Further, the outer side surface of the reset guide key comprises an upper chamfer section and a lower vertical section.

[0010] Further, the reset guide key is arranged at the front, rear, left and right four directions of the lower boring port of the center body support pier.

[0011] Further, the pile foundation plate is L-shaped.

[0012] Further, the pile foundation plate is arranged at the front, rear, left and right four directions of the lower boring port of the center body support pier.

[0013] Further, the jacking assembly is a pie-type jack.

[0014] An adjusting method of the adjusting structure is provided, which comprises the following steps.

[0015] In step a, the rotor support is hoisted to the upper side of the magnetic yoke by using a lifting appliance, and then the rotor support is dropped, the rotor center body is guided by the reset guide key and falls on the center body support pier, the reset guide key can also preliminarily position the rotor support and prevent the center of the rotor support from deviating, the center of the rotor support is positioned once, and the safety hidden danger caused by repeated adjustment is avoided.

[0016] In step b, the lifting appliance is removed, an adjusting rotor roundness frame is installed, the roundness of the magnetic yoke is measured, the center deviation of the rotor support and the magnetic yoke is calculated based on the roundness of the magnetic yoke, the adjusting direction is determined, the jacking assembly is installed in the pile foundation plate arranged in the center body support pier, the inner side of the rotor center body is pushed by operating the jacking assembly to generate corresponding displacement, and the deviation of the concentricity between the rotor center body and the original magnetic yoke is adjusted to be optimal.

[0017] Further, in step a, the rotor support is hoisted to the upper side of the magnetic yoke by using a lifting appliance, the position of the rotor support is checked to be correct, and the radial clearance between the rotor support and the magnetic yoke is uniform, then the rotor support is dropped, the rotor support is reset with the magnetic yoke, when the lower plane of the rotor center body reaches the height of 280mm to 320mm above the center body support pier, the dropping is stopped, the tangential position of the vertical key groove of the rotor support and the dove tail groove of the magnetic yoke should be symmetrical, and the radial clearance should be uniform, then the rotor support is continuously dropped to the center body support pier.

[0018] Further, the step b, in the top support assembly opposite side orientation installation dial real-time monitoring center body displacement.

[0019] Further, before the old rotor support is removed, a reset guide key is installed in the inner side of the center body support pier based on the old rotor center body lower boring port, a gap of 0.5mm to 1.0mm is kept between the reset guide key and the inner surface of the old rotor center body, and the upper outer side of the reset guide key is cut into a 30° chamfer; at the same time, a pile foundation plate is installed beside the reset guide key, and the gap between the pile foundation plate and the inner surface of the center body should be able to vertically place a top support assembly.

[0020] The beneficial effects of the application are: simple technical principle, strong operability, high safety and reliability, can effectively reduce the construction risk; and the resources such as equipment, materials and manpower are less, the cost is low, the work efficiency is high, the economic benefit is good, and it is especially suitable for the overall replacement and reconstruction of the disc type rotor support of the hydropower station.

[0021] The aforementioned main scheme of the application and each further selected scheme can be freely combined to form multiple schemes, all of which are the schemes that can be adopted and claimed by the application; and the application can also be freely combined between each non-conflicting selection and other selections. Those skilled in the art can understand that there are many combinations according to the existing technology and common knowledge after understanding the schemes of the application, all of which are the technical schemes claimed by the application, and are not listed here. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the layout schematic diagram of the application.

[0023] Figure 2 is the A-A sectional view of Figure 1 .

[0024] Figure 3 is the B-B sectional view of Figure 1 .

[0025] In the figure: 10-rotor center body, 20-center body support pier, 1-reset guide key, 2-pile foundation plate, 3-top support assembly. DETAILED DESCRIPTION

[0026] The following non-limiting examples are used to illustrate the application.

[0027] Example 1:

[0028] Referring to Figures 1-3 , a large rotor support reset concentricity adjusting structure includes a center body support pier 20, a reset guide key 1 and a pile foundation plate 2 are arranged on the inner side of the center body support pier 20, and the reset guide key 1 and the pile foundation plate 2 are arranged in the front, rear, left and right four directions of the lower boring port of the center body support pier 20.

[0029] The reset guide key 1 is L-shaped and made of thick steel plate, one end of which is fixed to the inner side of the center body support 20 by welding, and the other end is used for guiding and positioning. The outer side of the reset guide key 1 is a guide surface, which cooperates with the inner side of the rotor center body 10. The outer side of the reset guide key 1 includes a 30° chamfered section at the upper part and a vertical section at the lower part, the chamfered section for transition guiding, and the vertical section for guiding and positioning.

[0030] The pile base plate 2 is L-shaped and made of thick steel plate, one end of which is fixed to the center body support 20 by welding, and the other end is used for supporting the jacking assembly 3.

[0031] The jacking assembly 3 is horizontally movable on the pile base plate 2, and the outer end of the jacking assembly 3 cooperates with the inner side of the rotor center body 10. The jacking assembly 3 is a pie-type hydraulic jack, which is used to displace the inner side of the rotor center body 10 by the extension and retraction of the jack.

[0032] Example 2:

[0033] Reference Figures 1-3 As shown in the drawings, an adjustment method of the adjustment structure includes a rotor support center quick positioning technology and a reset concentricity adjustment technology, and specifically includes the following steps:

[0034] According to the characteristics that the inner diameter size of the center body remains unchanged before and after the rotor support is modified, in order to accurately reset the new rotor support and the original magnetic yoke, before the old rotor support is removed, a reset guide key 1 made of thick steel plate is installed at 90° symmetrically in front of and behind and left and right of the inner side of the center body support, with the lower boring hole of the old rotor center body as the reference. The reset guide key 1 and the inner surface of the old rotor center body are kept at a gap of 0.5mm to 1.0mm, and the upper outer side of the reset guide key 1 is cut into a 30° chamfer. At the same time, a pile base plate 2 made of thick steel plate is installed beside the reset guide key 1, and the gap between the pile base plate 2 and the inner surface of the center body should be able to vertically place a jacking assembly 3.

[0035] Step a: When the new rotor support is coupled with the original magnetic yoke, the rotor support is lifted to the upper side of the magnetic yoke by using the bridge machine of the power plant workshop and the special lifting tool, the orientation of the rotor lead is confirmed to be correct, the position of the 1# main stand is confirmed to be correct, the tangential position symmetry and the uniform gap of the stand key groove and the corresponding magnetic yoke dove tail groove are checked, and the support is slowly lowered. When the lower disc of the rotor support is about 300mm away from the upper plane of the center body support (above the reset guide key 1), the lowering is stopped. The tangential position symmetry of the adjustment stand key groove and the magnetic yoke dove tail groove is checked again, it is confirmed that the inner side of the rotor center body does not interfere with the reset guide key 1, then the rotor support is continuously slowly lowered along the reset guide key 1 until the rotor support is completely placed on the center body support.

[0036] The rotor center body 10 is guided by the reset guide key 1 to fall on the center body support 20, and the reset guide key 1 can also preliminarily position the rotor support to prevent the center of the rotor support from deviating, thereby achieving one-time positioning of the center of the rotor support. The method can help quickly position the rotor center body, and the rotor center body is positioned at one time, thereby avoiding repeated adjustment by the workshop bridge machine, effectively preventing the center of the rotor support from deviating, and minimizing the construction safety risk. The reset guide key 1 in the method mainly plays a guiding and preliminary positioning role.

[0037] After the rotor support hanger is removed, the levelness of the rotor center body is adjusted to be qualified, a rotor circle measuring frame is installed, the roundness of the magnetic yoke is measured, the deviation of the center of the magnetic yoke is calculated based on the roundness of the magnetic yoke, and the concentricity of the rotor center body and the magnetic yoke is adjusted based on the deviation. First, the position of the deviation to be adjusted is determined, the jacking assembly 3 is installed in the pile base plate 2 at the position, and the concentricity is accurately adjusted by jacking through the operation of the jacking assembly 3, while the dial gauge is installed at the position opposite to the jacking assembly 3 to monitor the displacement of the center body in real time. During the adjustment process, it is necessary to check that the tangential positions of the dove tail groove of the magnetic yoke and the stud key groove should always be symmetrical.

[0038] The concentricity deviation of the rotor center body 10 and the original magnetic yoke is adjusted to be optimal by jacking the inside of the rotor center body 10 to produce a corresponding displacement through the operation of the jacking assembly 3. The method can help accurately adjust the concentricity of the rotor support and the magnetic yoke, and the process principle is simple and easy to operate.

[0039] The foregoing basic examples and each further selected example of the present application can be freely combined to form a plurality of embodiments, all of which are embodiments that can be used and claimed by the present application. In the present application, each selected example can be arbitrarily combined with any basic example and selected example.

[0040] The above only describes the preferred embodiments of the present application and does not limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A large rotor support reset concentricity adjusting structure, comprising a center body pier (20), characterized in that: The inner side of the center body support pier (20) is provided with a reset guide key (1) and a pile foundation plate (2), the outer side of the reset guide key (1) is a guide surface, the guide surface cooperates with the inner side of the rotor center body (10), the pile foundation plate (2) is provided with a horizontal movement top support assembly (3), the outer end of the top support assembly (3) cooperates with the inner side of the rotor center body (10). The reset guide key (1) is arranged at the front, rear, left and right four directions of the lower boring port of the center body support pier (20); the pile foundation plate (2) is arranged at the front, rear, left and right four directions of the lower boring port of the center body support pier (20); and the pile foundation plate (2) is L-shaped.

2. The large rotor support reset concentricity adjustment structure according to claim 1, characterized in that: The reset guide key (1) is L-shaped.

3. The large rotor support reset concentricity adjustment structure according to claim 1 or 2, characterized by: The outer side of the reset guide key (1) comprises an upper chamfered section and a lower vertical section.

4. An adjustment method of the adjustment structure according to any one of claims 1 to 3, characterized by, The method comprises the following steps: In step a, the rotor support is hoisted to the upper side of the magnetic yoke by using a lifting tool, and then the rotor support is lowered, the rotor center body (10) is guided by the reset guide key (1) and falls on the center body support pier (20), and the reset guide key (1) can also preliminarily position the rotor support to prevent the center of the rotor support from deviating, thereby realizing the first positioning of the center of the rotor support; In step b, the lifting tool is removed, a rotor roundness adjusting frame is installed, the roundness of the magnetic yoke is measured, the center deviation of the rotor support and the magnetic yoke is calculated based on the roundness of the magnetic yoke, the adjusting direction is determined, the top support assembly (3) is installed in the pile foundation plate (2) arranged in the center body support pier (20), the inner side of the rotor center body (10) is pushed by operating the top support assembly (3) to generate corresponding displacement, and the deviation of the concentricity of the rotor center body (10) and the original magnetic yoke is adjusted to be optimal.

5. The adjustment method of claim 4, wherein: In step a, the rotor support is hoisted to the upper side of the magnetic yoke by using a lifting tool, and then the rotor support is lowered, the rotor center body (10) is guided by the reset guide key (1) and falls on the center body support pier (20), and the reset guide key (1) can also preliminarily position the rotor support to prevent the center of the rotor support from deviating, thereby realizing the first positioning of the center of the rotor support; 6. The adjustment method according to claim 4 or 5, characterized in that: In step b, a dial indicator is installed at the opposite side of the top support assembly (3) to monitor the displacement of the center body in real time.

7. The adjustment method according to claim 4 or 5, characterized in that: Before the old rotor support is removed, the reset guide key (1) is installed on the inner side of the center body support pier based on the lower boring port of the old rotor center body, the gap between the reset guide key (1) and the inner surface of the old rotor center body is kept at 0.5mm to 1.0mm, and the upper outer side of the reset guide key (1) is cut into a 30° chamfer; meanwhile, the pile foundation plate (2) is installed beside the reset guide key (1), and the gap between the pile foundation plate (2) and the inner surface of the center body should be able to vertically place a top support assembly (3).

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