CN111105884B - Measurement process for online maintenance of large shielded main pump - Google Patents
Measurement process for online maintenance of large shielded main pump Download PDFInfo
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- CN111105884B CN111105884B CN202010062075.8A CN202010062075A CN111105884B CN 111105884 B CN111105884 B CN 111105884B CN 202010062075 A CN202010062075 A CN 202010062075A CN 111105884 B CN111105884 B CN 111105884B
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- main pump
- shielding main
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A measurement process for online maintenance of a large-scale shielding main pump belongs to the technical field of maintenance of large-scale shielding main pumps of nuclear power stations. The specific measurement contents of the invention are as follows: the end surface of the lower flange, the end surface of the pump shaft, the surface of the lower thrust disc, the rotor play amount and the like. Due to the structural characteristics of the shielding main pump, the limitation of factors such as field maintenance conditions and the like, the main used equipment is a laser measurement modeling device and the like. And a laser measuring device is used for positioning the center hole of the lower stator end cover, so that the positioning of the center hole is ensured. When pump shaft strutting arrangement and rotor subassembly locking device's dismouting in turn many times, installation laser measurement arm, measurement lower flange terminal surface, axle terminal surface, lower thrust disc surface etc. compare the analysis, guarantee the accuracy of axial and radial direction's numerical value in shielding main pump lower part locking cup change maintenance period to guarantee maintenance quality.
Description
Technical Field
The invention relates to the technical field of maintenance of large shielded main pumps of nuclear power stations, in particular to a measurement process for online maintenance of large shielded main pumps.
Background
After a nuclear power station runs for a long time, the possibility of problems of components such as a locking cup of a shielding type reactor coolant pump (hereinafter referred to as a shielding main pump) is increased gradually, and it is necessary to plan and develop a large shielding main pump online maintenance process in a radioactive environment in advance. The special device and the operation process involved in the shielding main pump online maintenance process have high use requirements, such as: drilling holes on the lower stator end cover, supporting and locking devices and the like, and strict control is needed among all the working procedures. Considering the quality precision of the on-line maintenance of the shielding main pump, the comprehensive analysis is carried out on the structure of the shielding main pump and the field conditions of the compartment, and the factors restricting the quality precision of the on-line maintenance process of the shielding main pump are as follows:
1. positioning a central hole of a stator end cover at the lower part of the shielding main pump: as a reference point for the on-line maintenance of the whole shielding main pump, the positioning precision of the shielding main pump directly influences the maintenance quality.
2. The influence of the mounting precision of the main pump rotor supporting device is shielded: because the upper thrust bearing assembly of the shielding main pump is in clearance fit with the motor shell, the upper thrust bearing assembly has the risk of falling integrally after the lower end cover is removed. Because lower thrust bearing assembly and motor casing fit clearance are less, in case the whereabouts condition appears in the lower thrust bearing assembly, because upper portion thrust bearing assembly sets up can be internal at the motor, can't ensure it and resume original position when repacking. Thus, it is ensured that the upper thrust bearing is not displaced during the disassembly of the lower stator end cover.
3. And (3) controlling the mounting precision of a rotor locking device of the shielding main pump: because the pump shaft support apparatus affects the removal of the lower stator end cap and the lower lock nut, a rotor locking apparatus is used to support the rotor assembly, and the pump shaft support apparatus is then removed. And when the lower thrust bearing assembly is removed, the rotor locking device is installed, the device acts on the surface of the lower thrust disc, and the rotor supporting device is removed after the installation is finished. In order to ensure the locking quality precision, the positions of the rotor supporting device before and after disassembly need to be measured and compared, and whether the rotor assembly is maintained at the original position or not is confirmed.
4. The process of replacing the lower locking cup of the shielding main pump on line is complex, and the supporting and locking device of the rotor assembly needs to be disassembled and assembled for many times in the process. To confirm that the components that shield the main pump rotor assembly and upper thrust bearing assembly remain in place, the position of the rotor must be accurately measured before each support replacement is performed. In order to confirm the position of a rotor component in the process of replacing the lower locking cup of the shielding main pump, the data of the end surface of a lower flange, the end surface of a pump shaft, the surface of a lower thrust plate, the channeling quantity of a rotor and the like need to be repeatedly measured, and the original position of the rotor is ensured according to a size chain. Due to the structural characteristics of the shielding main pump, the on-site maintenance operating environment and other factors.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a measuring process for online maintenance of a large shielding main pump, which can effectively ensure the accuracy and efficiency of online maintenance of the shielding main pump.
The purpose of the invention is realized by the following technical scheme:
a measurement process for online maintenance of a large shielded main pump comprises the following steps:
step 1, completing the work of drilling a central hole in a lower stator end cover;
step 5, supporting a lower stator end cover by adopting a plurality of groups of jacks, then removing a rotor supporting device of the shielding main pump, and retesting the end face position of the pump shaft;
and 7, carrying out on-line maintenance on the shielded main pump.
During the on-line maintenance period of the shielded main pump, the specific measurement contents are as follows: the end surface of the lower flange, the end surface of the pump shaft, the surface of the lower thrust disc, the rotor play amount and the like. Due to the structural characteristics of the shielding main pump, the limitation of factors such as field maintenance conditions and the like, the main used equipment is a laser measurement modeling device and the like. And a laser measuring device is used for positioning the center hole of the lower stator end cover, so that the positioning of the center hole is ensured. When pump shaft strutting arrangement and rotor subassembly locking device's dismouting in turn many times, installation laser measurement arm, measurement lower flange terminal surface, axle terminal surface, lower thrust disc surface etc. compare the analysis, guarantee the accuracy of axial and radial direction's numerical value in shielding main pump lower part locking cup change maintenance period to guarantee maintenance quality.
Preferably, step 1 comprises: and modeling the lower stator end cover of the shielding main pump and the lower flange of the shielding main pump by using laser modeling equipment, and positioning a central hole of the lower stator end cover.
Preferably, step 4 comprises: and finishing the cutting and repairing work of the lower C-shaped ring, and retesting the end face position of the pump shaft.
Preferably, step 4 further comprises: and the auxiliary device is adopted to support and slowly fall down to the lower stator end cover for a certain distance so as to reserve an installation space for shielding the rotor locking device of the main pump.
Preferably, in the whole maintenance process, the accuracy of each process is controlled by taking the end face of the lower flange of the shielding main pump as a reference.
Preferably, step 7 comprises the following steps:
step 9, removing the locking device of the rotor of the shielding main pump, and retesting the end surface position of the pump shaft and the surface position of the lower thrust plate;
step 10, jacking a lower stator end cover by using an auxiliary device;
step 11, welding a lower C-shaped ring and installing a lower stator end cover bolt;
and 12, removing the rotor supporting device of the shielding main pump, and retesting the end face position of the pump shaft.
The invention has the advantages that: the quality and the precision of the on-line maintenance process of the shielding main pump can be effectively improved, and the normal operation of the shielding main pump after maintenance is guaranteed.
Drawings
FIG. 1 is a schematic diagram of the present invention for locating and measuring initial data of a center hole of a stator end cover at the lower part of a shielded main pump;
FIG. 2 is a schematic view of the present invention after the assembly of the shield main pump rotor support;
fig. 3 is a schematic diagram of the measurement of the invention after the rotor locking device of the shield main pump is installed.
1-laser modeling equipment; 2-lower stator end cap; 3-shielding the main pump; 4-a laser measuring arm; 5-a rotor support means; 6-rotor locking device; 7-lower lock nut; 8-center hole.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
And modeling the lower flange of the lower stator end cover 2 of the shielding main pump and the lower flange of the shielding main pump 3 by using the laser modeling equipment 1, and positioning a central hole 8 of the lower stator end cover 2.
Step 1, finishing the work of drilling a central hole in a lower stator end cover 2;
and finishing the cutting and repairing work of the lower C-shaped ring, retesting the end face position of the pump shaft, and supporting and slowly dropping the lower stator end cover 2 for a certain distance by adopting an auxiliary device so as to reserve an installation space for shielding the main pump rotor locking device 6.
step 5, supporting the lower stator end cover 2 by adopting a plurality of groups of jacks, then removing the rotor supporting device 5 of the shielding main pump, and retesting the end face position of the pump shaft;
and 7, carrying out on-line maintenance on the shielded main pump.
step 9, removing the locking device 6 for shielding the rotor of the main pump, and retesting the end surface position of the pump shaft and the surface position of the lower thrust plate;
step 10, jacking a lower stator end cover 2 by using an auxiliary device;
step 11, welding a lower C-shaped ring and installing a lower stator end cover bolt;
and 12, removing the rotor supporting device 5 of the shielding main pump, and retesting the end face position of the pump shaft.
During the on-line maintenance period of the shielded main pump, the specific measurement contents are as follows: the end surface of the lower flange, the end surface of the pump shaft, the surface of the lower thrust disc, the rotor play amount and the like. Due to the structural characteristics of the shielding main pump, the limitation of factors such as field maintenance conditions and the like, the main used equipment is a laser measurement modeling device and the like. And a laser measuring device is used for positioning the center hole of the lower stator end cover, so that the positioning of the center hole is ensured. When pump shaft strutting arrangement and rotor subassembly locking device's dismouting in turn many times, installation laser measurement arm, measurement lower flange terminal surface, axle terminal surface, lower thrust disc surface etc. compare the analysis, guarantee the accuracy of axial and radial direction's numerical value in shielding main pump lower part locking cup change maintenance period to guarantee maintenance quality.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A measurement process for online maintenance of a large shielded main pump is characterized by comprising the following steps:
step 1, completing the work of drilling a central hole in a lower stator end cover;
step 2, measuring the position of the flange end face of the lower shielding main pump and the position of the pump shaft end face by using a laser measuring arm;
step 3, mounting a rotor supporting device of the shielding main pump, measuring the end face position of the mounted pump shaft by using a laser measuring arm, and comparing and analyzing the end face position with the position before mounting to ensure that the rotor supporting device of the shielding main pump is mounted in place;
step 4, mounting a shielding main pump rotor locking device, measuring the end surface position of the mounted pump shaft and the surface position of the lower thrust disc by using a laser measuring arm, and comparing and analyzing the measured positions with the positions before mounting to ensure that the shielding main pump rotor locking device is mounted in place;
step 5, supporting a lower stator end cover by adopting a plurality of groups of jacks, then removing a rotor supporting device of the shielding main pump, and retesting the end face position of the pump shaft;
step 6, removing the lower stator end cover, the lower thrust bearing bush and the shaft sleeve, and retesting the end surface position of the pump shaft and the surface position of the lower thrust disc;
and 7, carrying out on-line maintenance on the shielded main pump.
2. The measurement process for the online maintenance of the large shielded main pump according to claim 1, wherein the step 1 is preceded by: and modeling the lower stator end cover of the shielding main pump and the lower flange of the shielding main pump by using laser modeling equipment, and positioning a central hole of the lower stator end cover.
3. The measurement process for the online maintenance of the large shielded main pump according to claim 1, wherein the step 4 is preceded by: and finishing the cutting and repairing work of the lower C-shaped ring, and retesting the end face position of the pump shaft.
4. The measurement process for the online maintenance of the large shielded main pump according to claim 1, wherein the step 4 is preceded by the following steps: and the auxiliary device is adopted to support and slowly fall down to the lower stator end cover for a certain distance so as to reserve an installation space for shielding the rotor locking device of the main pump.
5. The measurement process for the on-line maintenance of the large shielded main pump according to claim 1, wherein the accuracy of each process is controlled by taking the end face of the lower flange of the shielded main pump as a reference in the whole maintenance process.
6. The measurement process for the online maintenance of the large shielded main pump according to claim 1, characterized by comprising, after the step 7:
step 8, mounting the rotor supporting device of the shielding main pump again, and retesting the end face position of the pump shaft;
step 9, removing the locking device of the rotor of the shielding main pump, and retesting the end surface position of the pump shaft and the surface position of the lower thrust plate;
step 10, jacking a lower stator end cover by using an auxiliary device;
step 11, welding a lower C-shaped ring and installing a lower stator end cover bolt;
and 12, removing the rotor supporting device of the shielding main pump, and retesting the end face position of the pump shaft.
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| CN202010062075.8A CN111105884B (en) | 2020-01-20 | 2020-01-20 | Measurement process for online maintenance of large shielded main pump |
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| CN202010062075.8A CN111105884B (en) | 2020-01-20 | 2020-01-20 | Measurement process for online maintenance of large shielded main pump |
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| CN111105884A CN111105884A (en) | 2020-05-05 |
| CN111105884B true CN111105884B (en) | 2021-07-16 |
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| CN106816194A (en) * | 2015-11-27 | 2017-06-09 | 中国核工业第五建设有限公司 | Advanced passive pressurized water reactor cooling medium pump mounting process |
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| JP2017209689A (en) * | 2016-05-24 | 2017-11-30 | 株式会社東芝 | Laser peening device and laser peening method |
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| EP3150323B1 (en) * | 2015-09-30 | 2020-11-18 | Kabushiki Kaisha Toshiba | Laser processing apparatus, laser processing method and distance measurement method |
| US11112052B2 (en) * | 2017-03-30 | 2021-09-07 | Ge-Hitachi Nuclear Energy Americas Llc | Weld repair systems and methods for use in a nuclear reactor jet pump |
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2020
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| CN106816194A (en) * | 2015-11-27 | 2017-06-09 | 中国核工业第五建设有限公司 | Advanced passive pressurized water reactor cooling medium pump mounting process |
| JP2017209689A (en) * | 2016-05-24 | 2017-11-30 | 株式会社東芝 | Laser peening device and laser peening method |
| CN106340328A (en) * | 2016-09-09 | 2017-01-18 | 中国核工业二三建设有限公司 | Method for aligning and leveling pressure vessel cylinder and steam generator in nuclear power plant |
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