CN112983845B - Device and method for detecting positive and negative rotation of circulating water pump - Google Patents
Device and method for detecting positive and negative rotation of circulating water pump Download PDFInfo
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- CN112983845B CN112983845B CN202110231057.2A CN202110231057A CN112983845B CN 112983845 B CN112983845 B CN 112983845B CN 202110231057 A CN202110231057 A CN 202110231057A CN 112983845 B CN112983845 B CN 112983845B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
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- Structures Of Non-Positive Displacement Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention belongs to the technical field of automation, and particularly relates to a device and a method for detecting positive and negative rotation of a circulating water pump. In the prior art, the problems of difficulty in later maintenance and fault finding, low applicability and the like exist by taking encoder measurement and water pump power comparison as the basis for judging reversal. The device comprises: the reverse probe is connected with the pre-positioning device, the other end of the pre-positioning device is connected with the reverse detection control box, and the other end of the reverse detection control box is connected with the process logic control system. The method comprises the following steps: determining a lobe position; step two: installing a probe; step three: recording the time; step four: and judging positive and negative rotation. The invention provides the water pump positive and negative rotation detection algorithm which is clear in logic, convenient to implement, simple and efficient, detection precision can be improved to millisecond level, the algorithm is provided for fault detection of the reverse rotation probe, and the method is suitable for reverse rotation detection devices in different arrangements.
Description
Technical Field
The invention belongs to the technical field of automation, and particularly relates to a device and a method for detecting positive and negative rotation of a circulating water pump.
Background
Each nuclear power unit is provided with two circulating water pumps, and the circulating water pumps provide enough seawater for the conventional island of the nuclear power plant as a cooling source, so that the conventional island can always operate in a safe and stable environment. The motor is damaged or even completely burnt out due to the long-time reversal of the circulating water pump, so that the conventional island loses the final hot trap and the safe and stable operation of the nuclear power unit is directly influenced. The circulating water pump is controlled by a reverse rotation detecting device arranged on a body thereof: the device comprises a reverse rotation detection probe, a preposition device and a signal processing unit, and is used for outputting a forward and reverse rotation signal of the circulating water pump to a logic control system, locking and starting the pump and alarming.
In the prior art, the measurement of an encoder and the comparison of the power of a water pump are used as the basis for judging the reverse rotation, and the normal and reverse rotation of the pump are judged by detecting the phase difference of square wave waveforms formed by shaping two eddy current reverse rotation probes, but the realization of the mode is mostly realized by a complex digital/analog circuit, the mode is not easy to realize by a program algorithm, the later maintenance and the fault finding are difficult, the field adaptability modification cannot be carried out, and the forward and reverse rotation monitoring devices of the pumps of different types have low applicability.
Disclosure of Invention
1. The purpose is as follows:
in order to solve the defects of the prior art, the invention provides the water pump forward and reverse rotation detection algorithm which is clear in logic, convenient to implement, simple and efficient, the detection precision can be improved to millisecond level, the algorithm is provided for fault detection of the reverse rotation probe, and the algorithm is suitable for reverse rotation detection devices in different arrangements.
2. The technical scheme is as follows:
a circulating water pump is detection device just reversing, includes: the inversion probe is connected with the pre-processor, and the pre-processor processes the signal of the inversion probe into a direct current voltage signal; the other end of the prepositive device is connected with a reverse rotation detection control box, the other end of the reverse rotation detection control box is connected with a process logic control system, the reverse rotation monitoring control box outputs a forward rotation or reverse rotation signal of the circulating water pump, and a fault signal of a reverse rotation probe is transmitted to the process logic control system.
A positive and negative rotation detection method of a circulating water pump comprises the following steps: determining a lobe position; step two: installing a probe; step three: recording the time; step four: and judging positive and negative rotation.
The first step is as follows: determining a lobe position, specifically comprising: and determining a lobe position on a rotating shaft of the motor to be detected.
The second step is that: installing the probe specifically includes: and a fixed eddy current reversal detection probe is arranged on a fixed housing at the periphery of the motor rotating shaft according to the valve position, and the reversal probe is arranged along the clockwise direction.
The third step is that: recording time specifically comprises: when the reverse probe simultaneously faces to the motor rotating shaft slot position, timing is started, and the time when the reverse probe faces to the motor rotating shaft lobe position is respectively recorded; or the reverse probe starts timing when facing the motor rotating shaft lobe position at the same time, and respectively records the time of the reverse probe facing the motor rotating shaft slot position; and recording the duration of the voltage value of the inverted probe signal after being processed by the pre-processor.
The fourth step is that: the method for judging positive and negative rotation specifically comprises the following steps: the positive and negative rotation of the water pump is judged by the sequence of switching time points of the slot position and the lobe position of the motor rotating shaft opposite to the reverse rotation probe.
The fourth step is that: judging the positive and negative rotation, further comprising: and judging whether the reverse probe is normal or not through the duration of the voltage value of the reverse probe signal processed by the pre-processor.
The second step is that: and installing probes, wherein the included angle between the reverse probes is smaller than the angle occupied by a single valve on the motor rotating shaft.
3. The effect is as follows:
compared with the prior art, the invention has the beneficial effects that:
(1) The detection method comprises the steps of carrying out logic and mathematical operation on output direct-current voltage signals of two reverse rotation detection probes of the circulating water pump after being processed by a pre-processor, and finally outputting fault signals of the reverse rotation probes, the forward rotation probes and the reverse rotation probes of the circulating water pump;
(2) In a rotation period of the pump, the detection algorithm can perform reverse rotation detection for 4 times, the precision of reverse rotation monitoring of the circulating water pump is improved to millisecond level, and the reverse rotation state of the pump is found in time;
(3) The detection method also provides a solution for fault detection of the reverse probe of the circulating pump, finds the fault of the single reverse probe in time and provides convenience for maintenance of a reverse detection system;
(4) The detection method provides an effective monitoring means for debugging the pump reversal detection system, and facilitates the gap adjustment of field installation of the reversal probe;
the reversal detection algorithm is not only suitable for 2 valve positions of the Qinshan nuclear power circulating water pump, but also suitable for 1 valve position or a plurality of valve positions, and has wide applicability.
Drawings
FIG. 1 schematic diagram of a reverse rotation measuring device of a circulating water pump
FIG. 2 is a flow chart of the detection of positive and negative rotation of the circulating water pump
FIG. 3 is a schematic diagram of square wave signals of an inversion probe when a circulating water pump is inverted
FIG. 4 is a schematic diagram of square waves of signals of a reverse rotation probe in the forward rotation of the circulating water pump
Detailed Description
As shown in fig. 1, the installation schematic diagram of the inversion probe detection device in the field is provided for the detection method proposed by the present invention:
a novel method for detecting positive and negative rotation of a circulating water pump comprises the following steps:
(1) Determining 2 valve positions on a motor rotating shaft of a water pump to be detected;
(2) 2 fixed eddy current reversal detection probes are arranged on a fixed housing on the periphery of a motor rotating shaft, the 2 probes are arranged clockwise and are divided into a probe 1 and a probe 2, and an included angle between the two reversal probes is 50 degrees and is smaller than an angle occupied by a single valve position on the motor rotating shaft;
(3) When the 2 reverse probes simultaneously face the motor rotating shaft slot positions, timing is started, and along with the rotation of the motor, the time of the two reverse probes facing the motor rotating shaft lobe positions is respectively recorded; or when the 2 reverse probes simultaneously face the motor rotating shaft lobe positions, timing is started, and along with the rotation of the motor, the time when the two reverse probes face the motor rotating shaft slot positions is respectively recorded; recording the duration of the voltage values of the 2 reversal probe signals after being processed by the pre-processor;
the height of the lobe position on the motor rotating shaft is smaller than the linear interval of the voltage change of the eddy current probe, so that the signal voltage can not be changed violently when the eddy current probe faces the slot position or the lobe position;
(4) The signal of the inversion probe is processed by the pre-processor and then sends a direct current voltage signal to the inversion monitoring control box; the reverse rotation monitoring control box outputs a forward rotation or reverse rotation signal of the circulating water pump, and a fault signal of the reverse rotation probe is transmitted to the process logic control system.
Judging the positive and negative rotation of the water pump according to the sequence of switching time points of slot positions and lobe positions of the motor rotating shaft opposite to the 2 reverse rotation probes;
and judging whether the reverse probe is normal or not according to the duration of the voltage value of the 2 reverse probe signals after being processed by the pre-processor.
As shown in fig. 3 and 4, when the circulating water pump rotates forwards or backwards, the signals of the 2 reverse rotation probes can be shaped into square wave signals with 1 and 0 switching, and when the circulating water pump rotates backwards, the state switching of the square wave signals of the reverse rotation probe 1 is earlier than that of the square wave signals of the reverse rotation probe 2; when the circulating water pump rotates forwards, the state switching of the square wave signal of the reverse rotation probe 1 is later than the state switching of the square wave signal of the reverse rotation probe 2.
As shown in fig. 2, after the circulating water pump is started, the forward and reverse rotation detection and the probe fault detection are started, and after the direct-current voltage signal of the reverse rotation probe is received, the signal is shaped into a square wave signal and is logically processed by the following mathematical operations:
(1) When the reverse rotation probes 1 and 2 are both right opposite to the motor rotating shaft slot position, namely the square wave signals are all 1, the time is T0; when the reversal probe 1 is opposite to the lobe position, the square wave signal of the reversal probe is changed into 0, and the timing is T1; when the inverting probe 2 is facing the lobe, the square wave signal thereof becomes 0, and the time is T2:
(T1-T0) < (T2-T0), which is an inversion; (T1-T0) > (T2-T0) in the forward rotation;
(2) When the reverse rotation probes 1 and 2 are both directly opposite to the motor rotating shaft lobe positions, namely the square wave signals are both 0, the time is T3; when the reverse probe 1 is right opposite to the slot position, the square wave signal of the reverse probe is changed into 1, and the time is T4; when the inverting probe 2 is facing the slot, its square wave signal becomes 1, timing is T5:
(T4-T3) < (T5-T3), which is an inversion; (T4-T3) > (T5-T3) in the forward rotation;
(3) When the duration of the square wave signal 1 corresponding to the reverse probe 1 is recorded as T11, the duration of the square wave signal 1 is recorded as T12, and if T11 or T12 is greater than the rotation period of the circulating water pump, the reverse probe 1 is considered to be in fault;
when the duration of the square wave signal 1 corresponding to the reverse probe 2 is recorded as T21, the duration of the square wave signal 1 is recorded as T22, and if T21 or T22 is greater than the rotation period of the circulating water pump, the reverse probe 2 is considered to be in fault;
the fault detection of the reverse probe can confirm whether the reverse probe needs to be put into the water circulation pump or not by switching the operation modes so as to avoid the fault reporting of the reverse probe when the water circulation pump stops;
whether the circulating water pump is started or stopped, when the direct-current voltage signal output by the reverse probe is between voltage values corresponding to the valve position and the slot position of the reverse probe and the duration is more than 1s, the reverse probe is considered to be in fault.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (6)
1. A positive and negative rotation detection method of a circulating water pump is characterized by comprising the following steps: the method comprises the following steps: determining a lobe position; step two: installing a probe; step three: recording the time; step four: judging positive and negative rotation;
step four: judging the positive and negative rotation, specifically comprising: judging the forward and reverse rotation of the water pump according to the sequence of switching time points of a slot position and a flap position of a motor rotating shaft, which are opposite to a reverse rotation probe;
after receiving the direct current voltage signal of the reverse probe, the signal is shaped into a square wave signal and is subjected to logic and mathematical processing:
(1) When the reverse rotation probes 1 and 2 are both right opposite to the motor rotating shaft slot position, namely the square wave signals are all 1, the time is T0; when the reversal probe 1 is opposite to the lobe position, the square wave signal of the reversal probe is changed into 0, and the time is recorded as T1; when the inverting probe 2 is facing the lobe, the square wave signal becomes 0, and the time is T2:
(T1-T0) < (T2-T0), which is an inversion; (T1-T0) > (T2-T0) in the forward rotation;
(2) When the reverse rotation probes 1 and 2 are both directly opposite to the motor rotating shaft lobe positions, namely the square wave signals are both 0, the time is T3; when the reverse probe 1 is right opposite to the slot position, the square wave signal of the reverse probe is changed into 1, and the time is T4; when the inverting probe 2 is facing the slot, its square wave signal becomes 1, timing is T5:
(T4-T3) < (T5-T3), which is an inversion; (T4-T3) > (T5-T3) in the forward rotation;
step four: judging the positive and negative rotation, further comprising: judging whether the reverse probe is normal or not through the duration of the voltage value of the reverse probe signal processed by the pre-processor, recording the duration of a square wave signal 1 corresponding to the reverse probe 1 as T11, recording the duration of the square wave signal 1 as T12, and considering that the reverse probe 1 is in fault if T11 or T12 is greater than the rotation period of the circulating water pump;
when the duration of the square wave signal 1 corresponding to the reverse probe 2 is recorded as T21, the duration of the square wave signal 1 is recorded as T22, and if T21 or T22 is greater than the rotation period of the circulating water pump, the reverse probe 2 is considered to be in fault;
the fault detection of the reverse rotation probe can confirm whether the operation mode is switched to input or not so as to avoid the fault reporting of the reverse rotation probe when the circulating water pump stops;
and whether the circulating water pump is started or stopped, when the direct-current voltage signal output by the reverse probe is between the voltage values corresponding to the opposite lobe position and the slot position of the reverse probe and the duration is more than 1s, the reverse probe is considered to be in fault.
2. The method for detecting the forward and reverse rotation of the circulating water pump according to claim 1, characterized by comprising the following steps: the first step is as follows: determining a lobe position, specifically comprising: and determining a lobe position on a rotating shaft of the motor to be tested.
3. The method for detecting the positive and negative rotation of the circulating water pump according to claim 1, characterized in that: the second step is that: installing the probe specifically includes: and a fixed eddy current reversal detection probe is arranged on a fixed housing at the periphery of the motor rotating shaft according to the valve position, and the reversal probe is arranged along the clockwise direction.
4. The method for detecting the positive and negative rotation of the circulating water pump according to claim 1, characterized in that: the third step is that: recording time specifically comprises: when the reverse probe simultaneously faces to the motor rotating shaft slot position, timing is started, and the time when the reverse probe faces to the motor rotating shaft lobe position is respectively recorded; or the reverse probe starts timing when facing the motor rotating shaft lobe position at the same time, and respectively records the time of the reverse probe facing the motor rotating shaft slot position; and recording the duration of the voltage value of the inverted probe signal after being processed by the pre-processor.
5. The method for detecting the forward and reverse rotation of the circulating water pump according to claim 3, characterized by comprising the following steps: the second step is that: and installing probes, wherein the included angle between the reverse probes is smaller than the angle occupied by a single valve on the motor rotating shaft.
6. The device for detecting the forward and reverse rotation of the circulating water pump in the method for detecting the forward and reverse rotation of the circulating water pump according to claim 1, characterized in that: the method comprises the following steps that an inversion probe is connected with a pre-processor, and the pre-processor processes signals of the inversion probe into direct-current voltage signals; the other end of the prepositive device is connected with a reverse rotation detection control box, the other end of the reverse rotation detection control box is connected with a process logic control system, the reverse rotation monitoring control box outputs a forward rotation or reverse rotation signal of the circulating water pump, and a fault signal of a reverse rotation probe is transmitted to the process logic control system.
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| CN202110231057.2A CN112983845B (en) | 2021-03-02 | 2021-03-02 | Device and method for detecting positive and negative rotation of circulating water pump |
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| IT1301915B1 (en) * | 1998-08-07 | 2000-07-07 | Sicce Spa | PROCEDURE FOR STARTING AND POWER SUPPLY OF A MOTOR, SYNCHRONOUS TO PERMANENT MAGNETS, PARTICULARLY FOR THE OPERATION OF A |
| EP1512949B1 (en) * | 2003-09-04 | 2007-01-03 | Askoll Holding S.r.l. | Method and device for determining the hydraulic flow rate in a pump |
| CN202673707U (en) * | 2012-07-31 | 2013-01-16 | 湖南崇德工业科技有限公司 | Negative-rotation detecting device of electric water pumping unit |
| CN208885546U (en) * | 2018-10-18 | 2019-05-21 | 云南大红山管道有限公司 | A kind of big-diameter pipeline conveying pump group monitoring system |
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