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CN-224201239-U - Nuclear power plant reactor coolant pump shaft seal flow isolation valve flow limiting device and isolation valve

CN224201239UCN 224201239 UCN224201239 UCN 224201239UCN-224201239-U

Abstract

The application relates to a flow limiting device and an isolating valve of a shaft seal flow isolating valve of a reactor coolant pump of a nuclear power plant, wherein the flow limiting device of the shaft seal flow isolating valve of the reactor coolant pump of the nuclear power plant comprises a rotating piece, an end cover and a positioning piece, and the rotating piece is used for connecting a hand wheel; the rotary part is provided with avoidance holes and limiting holes which are arranged at intervals, the avoidance holes are used for allowing the valve rod to pass through, the limiting holes are arranged around the avoidance holes and arc-shaped, the end cover is provided with connecting holes which are used for being in threaded connection with the valve rod, the positioning part is arranged between the rotary part and the end cover and provided with through holes for allowing the valve rod to pass through, the positioning part is detachably connected with the end cover, and the positioning part is provided with limiting parts which movably pass through the limiting holes. The application has simple structure and convenient operation, and can realize the accuracy and the rapidity of the opening degree limiting adjustment of the isolating valve.

Inventors

  • LIANG XIAOBO
  • LIU YANG
  • ZHANG TAO
  • CHEN XUEBAO
  • XIE MEIHONG
  • FANG JING

Assignees

  • 阳江核电有限公司

Dates

Publication Date
20260505
Application Date
20250526

Claims (10)

  1. 1. The utility model provides a nuclear power plant reactor coolant pump shaft seal flow isolation valve current limiter, is applied to the isolation valve, the isolation valve includes hand wheel and valve rod, hand wheel and valve rod threaded connection, its characterized in that, nuclear power plant reactor coolant pump shaft seal flow isolation valve current limiter includes: The rotary part (1) is used for connecting the hand wheel, the rotary part (1) is provided with avoidance holes (1 a) and limit holes (1 b) which are arranged at intervals, and the avoidance holes (1 a) are used for the valve rod to pass through; The end cover (2) is provided with a connecting hole (2 a), and the connecting hole (2 a) is used for being in threaded connection with the valve rod; The positioning piece (3) is arranged between the rotating piece (1) and the end cover (2) and is provided with a through hole (3 a) for the valve rod to pass through, the positioning piece (3) is detachably connected with the end cover (2), the positioning piece (3) is provided with a limiting piece (31), and the limiting piece (31) movably penetrates through the limiting hole (1 b).
  2. 2. The nuclear power plant reactor coolant pump shaft seal flow isolation valve flow limiting device according to claim 1, wherein the number of the limiting holes (1 b) is a plurality, and the limiting holes (1 b) are arranged at intervals and symmetrically; The number of the limiting pieces (31) is multiple, and each limiting piece (31) is movably arranged in one limiting hole (1 b) in a penetrating mode.
  3. 3. The flow limiting device of the shaft seal flow isolation valve of the nuclear power plant reactor coolant pump according to claim 1, further comprising a locking piece (4), wherein the end cover (2) is provided with a fixing hole (2 b), the positioning piece (3) is provided with an adjusting hole (3 b), and the locking piece (4) is detachably penetrated in the fixing hole (2 b) and the adjusting hole (3 b).
  4. 4. A nuclear power plant reactor coolant pump shaft seal flow isolation valve flow restriction device as claimed in claim 3, characterized in that the positioning member (3) is further provided with a plurality of adjustment holes (3 b), and the adjustment holes (3 b) are distributed around the through hole (3 a) at axisymmetric intervals.
  5. 5. The nuclear power plant reactor coolant pump shaft seal flow isolation valve flow restriction device of claim 4, wherein the number of adjustment holes (3 b) is in the range of 5-20.
  6. 6. The flow limiting device of the shaft seal flow isolation valve of the nuclear power plant reactor coolant pump according to claim 4, wherein the fixing hole (2 b) is provided with internal threads, the locking piece (4) comprises an operation portion (41) and a locking portion (42) connected with the operation portion (41), the locking portion (42) is provided with external threads, the locking portion (42) is in threaded connection with the fixing hole (2 b), the locking portion (42) penetrates through the adjusting hole (3 b), and the operation portion (41) is located on one side, away from the locating piece (3), of the end cover (2).
  7. 7. The flow limiting device of the shaft seal flow isolation valve of the nuclear power plant reactor coolant pump according to claim 1, wherein one side of the rotating piece (1) away from the positioning piece (3) is provided with at least one clamping part (11), and the clamping part (11) is used for connecting with the hand wheel.
  8. 8. The flow limiting device of a shaft seal flow isolation valve of a nuclear power plant reactor coolant pump according to claim 7, wherein the clamping part (11) comprises two clamping pins (111), the two clamping pins (111) are arranged at intervals to form clamping grooves (11 a), and the clamping grooves (11 a) are used for accommodating spokes of the hand wheel.
  9. 9. The flow limiting device of the shaft seal flow isolation valve of the nuclear power plant reactor coolant pump according to claim 1, wherein a sleeve part (21) is arranged on one side of the end cover (2) facing the positioning piece (3), the sleeve part (21) is provided with the connecting hole (2 a), the connecting hole (2 a) is provided with internal threads, and the sleeve part (21) is arranged in the through hole (3 a) in a penetrating mode.
  10. 10. An isolation valve, comprising: A valve body; the valve rod is movably penetrated through the valve body; the hand wheel is rotationally arranged on the valve body and is in threaded connection with the valve rod; The flow limiting device for the shaft seal flow isolation valve of the nuclear power plant reactor coolant pump according to any one of claims 1 to 9, wherein a rotating member (1) of the flow limiting device for the shaft seal flow isolation valve of the nuclear power plant reactor coolant pump is connected with the hand wheel, and the valve rod is penetrated through a avoidance hole (1 a) of the rotating member (1) and a through hole (3 a) of a positioning member (3) and is in threaded connection with an end cover (2).

Description

Nuclear power plant reactor coolant pump shaft seal flow isolation valve flow limiting device and isolation valve Technical Field The application relates to the technical field of nuclear power, in particular to a flow limiting device of a shaft seal flow isolation valve of a reactor coolant pump of a nuclear power plant and the isolation valve. Background When the reactor coolant pump shaft seal water filter of the nuclear power plant normally operates, the filter is put into operation for a series of standby, and when the filter in the operation series needs to be replaced due to high pressure difference, the filter in the standby series needs to be put into operation. In the process of putting the standby array filter into operation, although the standby array is full of water, the inlet isolation valve of the standby array filter is opened instantly due to the fact that the shaft seal water pressure of the reactor coolant pump is high (about 170 bar), the shaft seal water flow rate can be rapidly fluctuated due to the water-robbing effect, and the main control room gives out low warning on the shaft seal water flow rate of the reactor coolant pump. The replacement of the spare row of filters is completed, and the same situation can occur in the water filling and air exhausting processes. Frequent occurrences of such alarms can interfere with the master control room operator monitoring, distracting the operator. This requires that the opening of the redundant array of filter inlet isolation valves be as small as possible to avoid fluctuations introduced to the system. In view of the background, an isolation valve flow limiting device needs to be designed and developed. Disclosure of utility model The application provides a flow limiting device of a shaft seal flow isolation valve of a reactor coolant pump of a nuclear power plant and the isolation valve, so as to realize the limitation opening degree of the isolation valve. In a first aspect, the application provides a flow limiting device of a shaft seal flow isolation valve of a nuclear power plant reactor coolant pump, which is applied to an isolation valve, wherein the isolation valve comprises a hand wheel and a valve rod, the hand wheel is in threaded connection with the valve rod, and the flow limiting device of the shaft seal flow isolation valve of the nuclear power plant reactor coolant pump comprises: The rotary part is used for connecting the hand wheel, and is provided with avoidance holes and limiting holes which are arranged at intervals, wherein the avoidance holes are used for the valve rod to pass through; the end cover is provided with a connecting hole which is used for being in threaded connection with the valve rod; The positioning piece is arranged between the rotating piece and the end cover, is provided with a through hole for the valve rod to pass through, is detachably connected with the end cover, is provided with a limiting piece, and is movably arranged in the limiting hole in a penetrating mode. Further, the number of the limiting holes is multiple, and the limiting holes are arranged at intervals and symmetrically; the number of the limiting pieces is multiple, and each limiting piece is movably arranged in one limiting hole in a penetrating mode. The end cover is provided with a fixing hole, the positioning piece is provided with an adjusting hole, and the locking piece is detachably arranged in the fixing hole and the adjusting hole in a penetrating mode. Further, the positioning piece is further provided with a plurality of adjusting holes, and the adjusting holes are symmetrically distributed at intervals around the direction axis of the through hole. Further, the number of the adjusting holes is in the range of 5-20. The locking part comprises an operation part and a locking part connected with the operation part, wherein the locking part is provided with external threads and is in threaded connection with the fixing hole, and the locking part penetrates through the adjusting hole; Further, one side of the rotating piece, which is away from the positioning piece, is provided with at least one clamping part, and the clamping part is used for connecting the hand wheel. Further, the clamping portion comprises two clamping pins, the two clamping pins are arranged at intervals to form clamping grooves, and the clamping grooves are used for accommodating spokes of the hand wheel. Further, a sleeve part is arranged on one side of the end cover, facing the positioning piece, the sleeve part is provided with the connecting hole, the connecting hole is provided with internal threads, and the sleeve part penetrates through the through hole. In a second aspect, the present application provides an isolation valve comprising: A valve body; the valve rod is movably penetrated through the valve body; the hand wheel is rotationally arranged on the valve body and is in threaded connection with the valve rod; According to the flow limit