A replacement device and replacement process for the lower locking cup of a large-scale shielded main pump
A large-scale, locking technology, which is applied in nuclear engineering, manufacturing tools, metal processing, etc., can solve the problems of overall drop, difficult gap control, and complex locking cup technology, so as to achieve simple structure, shorten critical path time, and reduce Effect of Total Radiation Dose
Active Publication Date: 2021-01-22
SANMEN NUCLEAR POWER CO LTD
View PDF9 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] 2. The support and locking requirements of the upper thrust bearing assembly of the shielded main pump: the upper thrust bearing assembly of the shielded main pump has the risk of falling as a whole after the lower stator end cover is removed
[0006] 3. It is difficult to control the gap in the online maintenance process of the shielded main pump: the online replacement of the lower locking cup of the shielded main pump is complicated, and the rotor assembly and the support and locking device of the pump shaft need to be disassembled many times during the process
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0065] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0066] A lower locking cup replacement device for a large shielded main pump, including a measuring assembly, a drilling assembly, a rotor supporting assembly, a rotor locking assembly, a lower C-ring cutting and repairing assembly, and a lower stator end cover auxiliary supporting assembly;
[0067] The measurement assembly includes a laser modeling device a1 and a laser measurement arm a2;
[0068] The drilling assembly includes a drilling bracket and a magnetic drill b2, and the drilling bracket includes a supporting frame b11, a fixing seat b12 arranged on the upper end of the supporting frame b11, and a fixing claw b13 arranged on the fixing seat b12 , the fixing seat b12 and the bottom of the supporting frame b11 are provided with jacking screws b14, and the magnetic drill b2 is fixed in the drilling bracket through a plurality ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a device and process for replacing a lower locking cup of a large shielding main pump, and belongs to the technical field of maintenance of large shielding main pumps of nuclear power stations. A center hole is drilled in the center of a lower stator end cover, and two rotor supporting devices acting on the end face of a pump shaft are arranged, researched and developed according to whether the aperture is larger than a pump shaft center hole. After a rotor is supported, lower C-shaped sealing cutting and root cleaning are completed, the lower stator end cover, a lowerthrust bearing assembly and other components are removed, and lower locking cup online replacement work is executed. After overhaul is finished, the lower stator end cover is installed back, and the drilled portion of the end cover is subjected to tapping and plugging sealing. The structure is simple, operation is convenient and fast, the functions of local disassembly overhaul of the shielding main pump and replacement of the lower locking cup can be achieved on the premise that the shielding main pump is integrally disassembled and decomposed, the main pump overhaul critical path time is greatly shortened, and the radiation total dose of maintenances staff is reduced.
Description
technical field [0001] The invention relates to the technical field of maintenance of a large-scale shielded main pump of a nuclear power plant, in particular to a replacement device and a replacement process for a locking cup at the lower part of a large-scale shielded main pump. Background technique [0002] After the nuclear power plant has been in operation for a long time, the possibility of problems such as the lower locking cup of the shielded reactor coolant pump (hereinafter referred to as: shielded main pump) gradually increases. Plan ahead and develop online maintenance of large shielded main pumps in radioactive environments Craftsmanship is necessary. The casing of the shielded main pump is welded to the bottom head of the steam generator, and the shielded main pump is installed upside down on the pump casing through 24 main bolts. Due to the design of the nuclear power plant, the overhaul of the shielded main pump can only be carried out after the shielded mai...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B23P6/00B23P19/00G21C17/00
CPCB23P6/00B23P15/00B23P19/00G21C17/00Y02E30/30
Inventor 李涛董宝泽李松王斌元廖长城王信东耿加森曹阳郦元辉王扬王超林鑫辉
Owner SANMEN NUCLEAR POWER CO LTD