CN-122014891-A - Passive nuclear power plant alternating current valve electric device and control method thereof

CN122014891ACN 122014891 ACN122014891 ACN 122014891ACN-122014891-A

Abstract

The invention provides an alternating current valve electric device of a passive nuclear power plant and a control method thereof, which belong to the technical field of valve devices and comprise a speed reduction transmission mechanism, an alternating current motor and a travel controller, wherein the speed reduction transmission mechanism comprises a primary turbine worm speed reduction device and a primary bevel gear speed reduction device which are sequentially connected, the travel controller comprises a plurality of layers of travel switches, a rotating shaft of the travel controller is linked with the speed reduction transmission mechanism, at least two layers of travel switches for outputting key control signals are specific travel switches, and the width of a metal contact piece on the rotating shaft of each specific travel switch is wider than that of metal contact pieces of other layers of travel switches so as to be firstly connected when the valve is opened or closed in place. According to the invention, through the accurate valve opening and closing state feedback of the valve electric device, the motor protection module in the alternating current power supply cabinet can effectively control the operation of the valve.

Inventors

ZHANG RUIQUAN
DONG HONGJIE
MA TAO
LI HU
LIU ZIFENG
GUAN TAO
Yan Huaiqing
Ji Chenyue

Assignees

上海核工程研究设计院股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260226

Claims (10)

1. An electric device of an alternating current valve of a passive nuclear power plant is characterized by comprising a speed reduction transmission mechanism, an alternating current motor and a stroke controller; the speed reduction transmission mechanism comprises a primary turbine worm speed reduction device and a primary bevel gear speed reduction device which are sequentially connected; The travel controller comprises a plurality of layers of travel switches, wherein a rotating shaft of the travel switches is linked with the speed reduction transmission mechanism, at least two layers of travel switches used for outputting key control signals are specific travel switches, and the width of metal contact pieces on the rotating shaft of each specific travel switch is wider than that of metal contact pieces of other layers of travel switches so as to be firstly switched on when a valve is opened or closed in place; the alternating current motor is connected with the speed reduction transmission mechanism, the motor protection device adjusts the phase sequence of the power supply side through the contactor according to the control command, and then adjusts the forward and reverse rotation of the alternating current motor, and finally the operation control of the valve is realized by controlling the speed reduction rotation mechanism.
2. The alternating current valve electric device of a passive nuclear power plant according to claim 1, wherein the key control signals comprise a valve opening state signal and a valve opening limit signal, the specific travel switch is used for outputting the valve opening state signal, and the metal contact piece of the specific travel switch enables the valve opening state signal to be communicated before the valve opening limit signal in the valve opening process.
3. The ac valve electric actuator of claim 1, wherein the key control signals comprise a valve closing state signal and a valve closing limit signal, the specific travel switch is used for outputting the valve closing state signal, and the metal contact of the specific travel switch enables the valve closing state signal to be switched on before the valve closing limit signal in the valve closing process.
4. The ac valve electromotive device of a passive nuclear power plant according to claim 1, further comprising a hand wheel connected to the bevel gear reduction unit through a manual/automatic switching mechanism to achieve switching between manual operation and electromotive operation.
5. The ac valve electric device of a passive nuclear power plant according to claim 1, wherein the transmission member of the device is made of alloy steel, the sealing member is made of fluororubber, the nonmetallic part is made of polyetherimide, and the device is made of aluminum-free material.
6. An ac valve electric device for a passive nuclear power plant as claimed in claim 1, wherein all wires inside the device are identified by irradiation.
7. The ac valve electromotive device of a passive nuclear power plant according to claim 6, wherein the wiring specification selection of the electric wire reserves a current margin exceeding 50%.
8. The ac valve electric device of claim 1, wherein said device is electrically connected to an external motor protection module, and said trip controller transmits said critical control signal to said motor protection module to cause said motor protection module to control and protect valve operation based on the sequencing of the signals.
9. The ac valve electric device for passive nuclear power plant as claimed in claim 1, wherein the primary bevel gear reduction unit is connected to the electric device and the valve.
10. A control method of an ac valve electric device of a passive nuclear power plant, comprising: The motor protection device receives a remote or local valve opening command, the motor protection device outputs a valve opening contactor coil loop to be conducted, a valve opening contactor contact is closed, the alternating current motor of the electric device is electrified, the valve is operated in the opening direction, when the valve is opened to be close to the limit position, a valve opening state indication is fed back to the motor protection device, then the valve opening limit indication is fed back to the motor protection device, the two indication signals are in correct sequence, the motor protection device outputs the valve opening contactor coil loop to be conducted and disconnected, the alternating current motor of the electric device is powered off, and the valve opening action of the valve is ended; the motor protection device receives a remote or local valve closing command, the motor protection device outputs to the valve closing contactor coil loop to be conducted, the valve closing contactor contacts are closed, the alternating current motor of the electric device is electrified, the valve is closed to run, when the valve is closed to be close to the limit position, the valve closing state indication is fed back to the motor protection device, then the valve closing limit indication is fed back to the motor protection device, the two indication signals are correct in sequence, the motor protection device outputs to the valve closing contactor coil loop to be conducted and disconnected, the alternating current motor of the electric device is powered off, and the valve closing action is finished.

Description

Passive nuclear power plant alternating current valve electric device and control method thereof Technical Field The invention belongs to the technical field of valve devices, and particularly relates to an alternating current valve electric device of a passive nuclear power plant and a control method thereof. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. In the operation system of the passive nuclear power plant, the on-off valve state feedback of the alternating current valve electric device and the motor protection module in the alternating current power supply cabinet are key components for guaranteeing the normal operation of the valve. However, the prior art has significant drawbacks. The state feedback of the opening and closing valve is caused by mechanical errors and the like, the feedback information is fuzzy, the sequence relation between the state indication and the travel switch cannot be distinguished, and the motor protection module cannot accurately acquire the actual running state of the valve and effectively control and protect the valve. For example, when the valve is close to the limit opening position, the valve state and the sequence of the valve opening limiting signals cannot be effectively distinguished, if the valve opening limiting is earlier than the valve opening state by more than 10ms, the motor protection can generate fault alarm to erroneously judge that the valve electric device is blocked, the motor protection is required to be reset in situ, the valve cannot be remotely controlled during the non-reset setting period, the safety of the system is affected, and the in-situ reset work increases the workload of operating personnel, on the other hand, when the valve is close to the limit closing position, the valve closing state and the sequence of the valve closing limiting signals cannot be effectively distinguished, the motor protection can cut off the power supply in advance, serious safety accidents are further caused, and the stable operation of the nuclear power plant is threatened. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides an alternating current valve electric device of a passive nuclear power plant and a control method thereof, improves the accurate sequence of a travel control switch and the working precision of the valve electric device, strengthens the cooperation with a motor protection module, and realizes accurate state feedback and reliable control. To achieve the above object, one or more embodiments of the present invention provide the following technical solutions: the invention discloses an electric device of an alternating-current valve of a passive nuclear power plant, which comprises a speed reduction transmission mechanism, an alternating-current motor and a stroke controller; the speed reduction transmission mechanism comprises a primary turbine worm speed reduction device and a primary bevel gear speed reduction device which are sequentially connected; The travel controller comprises a plurality of layers of travel switches, wherein a rotating shaft of the travel switches is linked with the speed reduction transmission mechanism, at least two layers of travel switches used for outputting key state signals are specific travel switches, and the width of metal contact pieces on the rotating shaft of each specific travel switch is wider than that of metal contact pieces of other layers of travel switches so as to be firstly switched on when a valve is opened or closed in place; the alternating current motor is connected with the speed reduction transmission mechanism, the motor protection device adjusts the phase sequence of the power supply side through the contactor according to the control command, and then adjusts the forward and reverse rotation of the alternating current motor, and finally the operation control of the valve is realized by controlling the speed reduction rotation mechanism. According to a further technical scheme, the key state signals comprise valve opening state signals and valve opening limiting signals, the specific travel switch is used for outputting the valve opening state signals, and the metal contact piece of the specific travel switch enables the valve opening state signals to be connected before the valve opening limiting signals in the valve opening process. According to a further technical scheme, the key state signals comprise a valve closing state signal and a valve closing limit signal, the specific travel switch is used for outputting the valve closing state signal, and the metal contact piece of the specific travel switch enables the valve closing state signal to be connected before the valve closing limit signal in the valve closing process. Further technical scheme still includes the hand wheel, the hand wheel through manual automatic switching me