CN110285045B - Nuclear power plant RCP main pump vibration phase monitoring system and method - Google Patents
Nuclear power plant RCP main pump vibration phase monitoring system and method Download PDFInfo
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- CN110285045B CN110285045B CN201910574643.XA CN201910574643A CN110285045B CN 110285045 B CN110285045 B CN 110285045B CN 201910574643 A CN201910574643 A CN 201910574643A CN 110285045 B CN110285045 B CN 110285045B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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Abstract
A system and a method for monitoring the vibration phase of a RCP main pump of a nuclear power plant are provided, wherein the system comprises: vibrating the probe: the device is used for acquiring vibration signals on a measured shaft; vibrating the frame: the vibration probe is used for processing vibration signals collected by the vibration probe; the standby rotating speed probe is used for acquiring pulse signals, and the pulse signals are generated when the measured shaft rotates for one circle; a signal transfer box: the key phase module is used for shunting pulse signals generated by the standby rotating speed probe and respectively transmitting the pulse signals to the rotating speed signal processing unit and the key phase signal processing cabinet; key phase signal processing rack, hand-held type dynamic balance tester. The invention does not need to be additionally provided with a temporary phase probe, can obviously reduce the starting and stopping times of the main pump and the time of a dynamic balance window, reduces the occupation of a key path of shutdown overhaul, and simultaneously reduces the radiation dose which is born by a worker due to the increase of the temporary phase probe.
Description
Technical Field
The invention belongs to the technical field of measurement, and particularly relates to a system and a method for monitoring the vibration phase of a RCP (Radar Cross-section) main pump of a nuclear power plant.
Background
The RCP main pump of the nuclear power plant operates under the conditions of high temperature, high pressure and high radiation, and has no standby and can not be stopped during the power operation, so that serious faults such as mechanical fatigue damage, shafting cracks, dynamic and static friction, sealing failure and the like can be generated when the main pump vibrates excessively, and vibration monitoring is an important means for judging the health condition of the main pump.
Monitoring the vibration state of a main pump in part of the early-built nuclear power plants at present is divided into online monitoring and offline monitoring. The monitoring mode is shown in figure 1:
online monitoring: the three main pumps are independently provided with 4 on-line sensors (2 bearing vibration sensors and 2 shaft vibration sensors), and sensor signals are processed by a simulation plate and then sent to a main control room recorder to display vibration numerical values.
Offline monitoring 1: during the power operation of the unit, the containment vessel is in a closed state, and a vibration engineer periodically collects original vibration analog signals from the electrical cabinet buffer output terminal by using a portable data collector. And replaying the measured data into a database, printing a measurement report by using special software, analyzing a frequency spectrum diagram and a trend diagram by using special software by a fault analysis engineer, evaluating the working state of the pump by combining the main pump thermal parameters displayed by the main control room, and predicting the vibration development trend of the pump.
And (3) offline monitoring 2: during the period of stopping and overhauling the dynamic balance test, the vibration frequency, the amplitude and the phase position are measured in situ by additionally arranging a temporary vibration and phase probe.
The following problems mainly exist in the current mode:
1. during the power running period, no phase monitoring exists, the vibration state of the main pump cannot be comprehensively monitored in real time, and the online analysis and diagnosis basis is lacked under the abnormal condition;
2. during overhaul dynamic balance test, a temporary phase probe needs to be additionally installed, the number of times of starting and stopping a main pump and the time of a dynamic balance window are increased, a shutdown overhaul critical path is occupied, and the temporary phase probe is increased to enable personnel to bear certain radiation dosage.
By combining the above discussion, it can be known that the RCP main pump vibration monitoring system of the current part of nuclear power plants is simple in structure, does not consider the main pump vibration phase monitoring function, and cannot monitor the phase on line particularly during the power operation.
Disclosure of Invention
The invention aims to provide a system and a method for monitoring the vibration phase of a RCP (remote control unit) main pump of a nuclear power plant, which aim to solve the technical problem that the phase cannot be monitored on line in the power running period in the prior art; and the problem that the prior art lacks on-line analysis and diagnosis basis under the condition of abnormal equipment operation is solved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a nuclear power plant RCP main pump vibration phase monitoring system, its characterized in that, the system includes:
vibrating the probe: the vibration machine frame is electrically connected with the vibration machine frame and is used for collecting vibration signals on the measured shaft;
vibrating the frame: the vibration probe is electrically connected with the hand-held dynamic balance tester and is used for processing vibration signals acquired by the vibration probe;
the standby rotating speed probe is electrically connected with the signal transfer box and is used for acquiring pulse signals, and the pulse signals are generated when the measured shaft rotates for one circle;
a signal transfer box: the key phase module is electrically connected with the standby rotating speed probe and the key phase signal processing cabinet, is used for shunting pulse signals collected by the standby rotating speed probe and respectively transmits the pulse signals to the rotating speed signal processing unit and the key phase signal processing cabinet;
a rotational speed signal processing unit: the signal transfer box is electrically connected with the signal transfer box and is used for processing the received pulse signals and forming a rotating speed measuring channel;
key phase signal processing rack: the key phase module is used for accommodating the key phase module and the vibrating frame;
hand-held dynamic balance tester: the key phase signal processing equipment is electrically connected with a key phase module and a vibration rack in a key phase signal processing cabinet, and is used for acquiring and displaying pulse type key phase signals and vibration signals, and determining phase signals according to comparison between the key phase signals and the vibration signals, wherein the phase signals are phase angles from a starting point of a pulse period in the pulse type key phase signals to a positive peak point in the vibration signals;
further preferably, the key phase module comprises one input BNC port and two output BNC ports.
Furthermore, the spare rotating speed probe is a magnetic resistance type sensor, and an output signal is about 1-2V.
Further, the key phase signal processing cabinet comprises a key phase module, wherein the key phase module is provided with a BNC input/output port and is communicated with the signal transfer box and the downstream hand-held dynamic balance tester through the BNC port.
Further, the key phase module receives a voltage signal from the standby rotating speed probe, and outputs a TTL level after filtering, shaping and amplifying.
Furthermore, the key phase module adopts a simple and friendly human-computer interaction interface, and displays plate information in the form of LED indicating lamps, wherein the LED indicating lamps comprise a power supply indicating lamp, an operation indicating lamp and an output indicating lamp.
Further, the system also comprises a key phase mark which is a newly-added convex key or an existing convex key on the measured shaft and is used for being matched with the standby rotating speed probe to generate the pulse signal.
In addition, the existing convex key is a target pin arranged on the measured shaft.
More preferably, the device further comprises a rotating speed signal processing unit electrically connected with the signal transfer box, wherein the standby rotating speed probe, the signal transfer box and the rotating speed signal processing unit form a rotating speed measuring channel; the standby rotating speed probe, the signal transfer box, the key phase module in the key phase signal processing cabinet and the handheld dynamic balance tester form a phase measurement channel.
A method for monitoring the vibration phase of an RCP (Radar Cross-section) main pump of a nuclear power plant is characterized by comprising the following steps:
acquiring a vibration signal of a measured shaft;
acquiring a pulse signal of the measured shaft, wherein the pulse signal is generated when the measured shaft rotates for one circle, and is further processed and converted into a pulse type key phase signal;
and calculating to obtain a phase signal of the measured shaft according to the obtained vibration signal and the pulse type key phase signal, wherein the phase signal is a rotation angle from a pulse period starting point in the pulse type key phase signal to a positive peak point in the vibration signal.
The implementation of the invention can achieve the following beneficial effects:
the system can still monitor the phase during the power running, can comprehensively monitor the vibration state in real time, and can provide an on-line analysis and diagnosis basis for maintenance under the condition of abnormal working of the main pump;
the invention does not need to be additionally provided with a temporary phase probe, can obviously reduce the starting and stopping times of the main pump and the time of a dynamic balance window, reduces the occupation of a key path of shutdown overhaul, and simultaneously reduces the radiation dose which is born by a worker due to the increase of the temporary phase probe.
Drawings
FIG. 1 is a prior art monitoring of the vibration state of a main pump according to the present invention;
FIG. 2 is a schematic diagram of the fundamental frequency vibration phase measurement principle involved in the present invention;
FIG. 3 is a block diagram of a first embodiment of a system for monitoring the vibration phase of a RCP main pump of a nuclear power plant according to the present invention;
fig. 4 is a structural block diagram of a second embodiment of a system for monitoring a vibration phase of an RCP main pump of a nuclear power plant according to the present invention.
Fig. 5 is a flowchart of a method for monitoring the vibration phase of the RCP main pump of the nuclear power plant according to the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
A system for monitoring the vibration phase of the RCP main pump of a nuclear power plant, as shown in fig. 3, the system includes:
vibrating the probe 1: the vibration machine frame is electrically connected with the vibration machine frame and is used for collecting vibration signals on the measured shaft;
the vibration frame 2: the vibration probe is electrically connected with the hand-held dynamic balance tester and is used for processing vibration signals acquired by the vibration probe;
the standby rotating speed probe 3 is electrically connected with the signal transfer box and is used for acquiring pulse signals, wherein the pulse signals are generated when the measured shaft rotates for one circle;
signal transfer box 4: the key phase module is electrically connected with the standby rotating speed probe and the key phase module in the key phase signal processing cabinet, is used for shunting pulse signals collected by the standby rotating speed probe and respectively transmits the pulse signals to the rotating speed signal processing unit and the key phase module in the key phase signal processing cabinet;
the key phase module 5: the signal transfer box is electrically connected with the data acquisition terminal and is used for processing the received pulse signal and transmitting the processed pulse signal to the handheld dynamic balance tester;
key phase signal processing cabinet 6: the key phase module is used for accommodating the key phase module and the vibrating frame;
hand-held dynamic balance tester 7: the vibration signal acquisition module is electrically connected with the key phase module and the vibration frame and used for acquiring and displaying pulse type key phase signals and vibration signals and determining phase signals according to comparison of the pulse type key phase signals and the vibration signals, wherein the phase signals are phase angles from a starting point of a pulse period in the pulse signals to a positive peak point in the vibration signals;
the key phase module comprises an input BNC port and two output BNC ports, the standby rotating speed probe is a reluctance type sensor, output signals are about 1-2V, and nonstandard square waves can be output as pulse type key phase signals after being processed. The rear end of the probe processes the non-standard square wave signal through the key phase module.
Example two
A system for monitoring the vibration phase of a RCP main pump of a nuclear power plant is disclosed, as shown in FIG. 1, and comprises:
vibrating the probe 1: the vibration machine frame is electrically connected with the vibration machine frame and is used for collecting vibration signals on the measured shaft;
the vibration frame 2: the vibration probe is electrically connected with the hand-held dynamic balance tester and is used for processing vibration signals acquired by the vibration probe;
the standby rotating speed probe 3 is electrically connected with the signal transfer box and is used for acquiring pulse signals, wherein the pulse signals are generated when the measured shaft rotates for one circle;
signal transfer box 4: the key phase module is electrically connected with the standby rotating speed probe, the key phase signal processing cabinet and the rotating speed signal processing unit, is used for shunting pulse signals collected by the standby rotating speed probe and respectively transmits the pulse signals to the rotating speed signal processing unit and the key phase signal processing cabinet;
the key phase module 5: the signal transfer box is electrically connected with the handheld dynamic balance tester and is used for processing the received pulse signal and transmitting the processed pulse signal to the handheld dynamic balance tester;
key phase signal processing cabinet 6: the key phase module is used for accommodating the key phase module and the vibrating frame;
hand-held dynamic balance tester 7: acquiring and displaying the processed pulse type key phase signal and the processed vibration signal, and comparing the pulse type key phase signal and the processed vibration signal to determine a phase signal, wherein the phase signal is a phase angle from a pulse period starting point in the pulse type key phase signal to a positive peak point in the vibration signal;
the key phase signal processing cabinet comprises a key phase module, wherein the key phase module is provided with a BNC input/output port and is communicated with the signal transfer box and the downstream hand-held dynamic balance tester through the BNC port; the key phase module receives a voltage signal from the standby rotating speed probe, and outputs a TTL level after filtering, shaping and amplifying; the key phase module adopts a simple and friendly man-machine interaction interface, and displays plate information in the form of LED indicating lamps, wherein the LED indicating lamps comprise a power supply indicating lamp, an operation indicating lamp and an output indicating lamp; the system also comprises a key phase mark which is a newly-added convex key or an existing convex key on the measured shaft and is used for being matched with the standby rotating speed probe to generate the pulse signal; the existing convex key is a target pin arranged on a measured shaft.
EXAMPLE III
A system for monitoring the vibration phase of the RCP main pump of a nuclear power plant, as shown in fig. 3, the system includes:
vibrating the probe 1: the vibration machine frame is electrically connected with the vibration machine frame and is used for collecting vibration signals on the measured shaft;
the vibration frame 2: the vibration probe is electrically connected with the hand-held dynamic balance tester and is used for processing vibration signals acquired by the vibration probe;
the standby rotating speed probe 3 is electrically connected with the signal transfer box and is used for acquiring pulse signals, wherein the pulse signals are generated when the measured shaft rotates for one circle;
signal transfer box 4: the key phase module is electrically connected with the standby rotating speed probe, the rotating speed signal processing unit and the key phase module in the key phase signal processing cabinet, is used for shunting pulse signals collected by the standby rotating speed probe and respectively transmits the pulse signals to the rotating speed signal processing unit and the key phase module in the key phase signal processing cabinet;
the key phase module 5: the signal transfer box is electrically connected with the data acquisition terminal and is used for processing the received pulse signals and transmitting the processed pulse signals to the data acquisition terminal;
key phase signal processing cabinet 6: the key phase module is used for accommodating the key phase module and the vibrating frame;
hand-held dynamic balance tester 7: comparing the processed pulse type key phase signal with the vibration signal to determine a phase signal, wherein the phase signal is a phase angle from a starting point of a pulse period in the pulse type key phase signal to a positive peak point in the vibration signal;
the device also comprises a rotating speed signal processing unit 8 electrically connected with the signal transfer box, wherein the rotating speed signal processing unit, the signal transfer box and the standby rotating speed probe form a rotating speed measuring channel; the standby rotating speed probe, the signal transfer box, the key phase module and the handheld dynamic balance tester form a phase measurement channel.
The input port of the signal transfer box is connected with the standby rotating speed probe through a coaxial cable; one path of the output port is connected with the rotating speed signal processing unit, and the other path of the output port is connected with the key phase module. Normally, the adapter box is kept in a state that the standby rotating speed probe is connected with the rotating speed signal processing unit, and when the phase needs to be monitored, the standby rotating speed probe is connected to the phase measurement channel through the signal adapter box. And after the phase measurement work is finished, the probe is restored to the rotating speed measurement channel. In the channel switching process, the rotating speed measurement in operation cannot be interfered.
The basic working principle of the invention is as follows:
a groove or a convex key is arranged on the measured shaft and used as a key phase mark, and when the groove or the convex key rotates to the position of the probe, the sensor generates a pulse signal. Each revolution of the shaft will produce a pulse signal of one period, the time of pulse production indicating the position of the shaft in each period, which will be used as the starting position for the key phase calculation. By counting the pulses, the rotational speed of the shaft can be measured; and the pulse signals are processed and converted into standard pulse signals and compared with vibration signals of the shaft, so that the phase angle of vibration can be determined and the standard pulse signals can be used for dynamic balance analysis of the shaft and fault analysis and diagnosis of equipment. And calculating the angle of the leading edge of the pulse signal before the high point of the vibration signal, wherein the high point refers to a certain point on the shaft, and when the point is rotated to the position of the measuring point, the vibration is just at the positive peak point. The fundamental frequency vibration phase measurement is schematically illustrated in fig. 2, and when the key phase device, i.e. the spare tachometer probe according to the present invention, is aligned with the groove or the convex key, the system will detect a pulse signal. Assuming that the 'high point' is at the position of the H point at the moment, and the corresponding vibration positive peak value is when the H point rotates to the lower side of the vibration probe at the next moment, the angle from the leading edge of the pulse to the positive peak value of the vibration waveform is calculated as the phase angle phi. According to the position and the phase angle of the vibrating probe, the position of a high point at any moment can be positioned.
A method for monitoring the vibration phase of an RCP (remote control unit) main pump of a nuclear power plant comprises the following steps:
s1, obtaining a vibration signal of the measured shaft;
s2, acquiring a pulse signal of the measured shaft, wherein the pulse signal is generated when the measured shaft rotates for one circle;
s3, calculating to obtain a phase signal of the measured shaft according to the obtained vibration signal and the pulse signal, wherein the phase signal is a phase angle from a pulse period starting point in the pulse signal to a positive peak point in the vibration signal.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. A nuclear power plant RCP main pump vibration phase monitoring system, its characterized in that, the system includes:
vibrating the probe: the vibration machine frame is electrically connected with the vibration machine frame and is used for collecting vibration signals on the measured shaft;
vibrating the frame: the vibration probe is electrically connected with the data acquisition terminal and is used for processing vibration signals acquired by the vibration probe;
standby rotating speed probe: the pulse signal acquisition device is electrically connected with the signal transfer box and is used for acquiring pulse signals, wherein the pulse signals are generated when the shaft to be detected rotates for one circle;
a signal transfer box: the key phase module is electrically connected with the standby rotating speed probe and the key phase signal processing cabinet, is used for shunting pulse signals collected by the standby rotating speed probe and respectively transmits the pulse signals to the rotating speed signal processing unit and the key phase signal processing cabinet;
a key phase module: the pulse type key phase signal shaping device is electrically connected with the signal transfer box and the data acquisition terminal, and is used for shaping the received pulse signal into a standard TTL level, namely a pulse type key phase signal, and then transmitting the standard TTL level to the handheld dynamic balance tester;
key phase signal processing rack: the key phase module is used for accommodating the key phase module and the vibrating frame;
hand-held dynamic balance tester: the system comprises a key phase signal processing cabinet, a vibration rack, a pulse type key phase signal and a phase signal, wherein the key phase signal processing cabinet is electrically connected with the key phase module and the vibration rack in the key phase signal processing cabinet and is used for testing and displaying the pulse type key phase signal and the vibration signal and determining the phase signal according to the comparison of the key phase signal and the vibration signal, and the phase signal is a phase angle from the starting point of a pulse period in the pulse type key phase signal to a positive peak point in the vibration signal;
the system also comprises a rotating speed signal processing unit electrically connected with the signal transfer box, and the standby rotating speed probe, the signal transfer box and the rotating speed signal processing unit form a rotating speed measuring channel; the standby rotating speed probe, the signal transfer box, the key phase signal processing cabinet and the handheld dynamic balance tester form a phase measurement channel;
the signal transfer box comprises an input BNC port and two output BNC ports;
the spare rotating speed probe is a magnetic resistance type sensor, and an output signal is 1-2V;
the key phase signal processing cabinet comprises a key phase module, wherein the key phase module is provided with a BNC input/output port and is communicated with the signal transfer box and the downstream hand-held dynamic balance tester through the BNC port;
the key phase module adopts a simple and friendly man-machine interaction interface, and displays plate information in the form of LED indicating lamps, wherein the LED indicating lamps comprise a power supply indicating lamp, an operation indicating lamp and an output indicating lamp;
the system also comprises a key phase mark which is an existing convex key on the measured shaft and is used for being matched with the standby rotating speed probe to generate a voltage pulse signal;
the existing convex key is a target pin arranged on the measured shaft.
2. The system for monitoring the vibration phase of the RCP main pump of the nuclear power plant as claimed in claim 1, wherein the key phase module receives the voltage signal from the standby speed probe, and outputs a standard TTL level, i.e. a pulse type key phase signal, after filtering, shaping and amplifying.
3. A method for performing nuclear plant RCP main pump vibration phase monitoring using a nuclear plant RCP main pump vibration phase monitoring system according to any one of claims 1-2, the method comprising:
acquiring a vibration signal of a measured shaft;
acquiring a pulse signal of the measured shaft, wherein the pulse type key phase signal is a standard voltage pulse signal generated when the measured shaft rotates for one circle, and is further processed and converted into a pulse type key phase signal;
and calculating to obtain a phase signal of the measured shaft according to the obtained vibration signal and the pulse type key phase signal, wherein the phase signal is a phase angle from a pulse period starting point in the pulse type key phase signal to a positive peak point in the vibration signal.
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| AU2022359229A1 (en) * | 2021-10-09 | 2024-05-02 | S.P.M. Instrument Ab | System and method for pump control based on pump vibrations |
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| CN102116670B (en) * | 2010-01-05 | 2012-08-08 | 华北电力科学研究院有限责任公司 | Vibration acquisition and analysis method |
| CN102456419B (en) * | 2010-10-22 | 2014-03-26 | 中国核动力研究设计院 | Method for monitoring nuclear reactor canned motor pump operation fault and monitoring system |
| CN105513651A (en) * | 2015-11-25 | 2016-04-20 | 中广核工程有限公司 | Nuclear reactor cooling pump vibration phase signal acquisition method and system thereof |
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