CN114184249A - Accumulated flow measuring device and accumulated flow control method for nuclear power plant - Google Patents
Accumulated flow measuring device and accumulated flow control method for nuclear power plant Download PDFInfo
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- CN114184249A CN114184249A CN202111405788.0A CN202111405788A CN114184249A CN 114184249 A CN114184249 A CN 114184249A CN 202111405788 A CN202111405788 A CN 202111405788A CN 114184249 A CN114184249 A CN 114184249A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
- G01F15/075—Integration to give total flow, e.g. using mechanically-operated integrating mechanism using electrically-operated integrating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
- G01F15/075—Integration to give total flow, e.g. using mechanically-operated integrating mechanism using electrically-operated integrating means
- G01F15/0755—Integration to give total flow, e.g. using mechanically-operated integrating mechanism using electrically-operated integrating means involving digital counting
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
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- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Testing And Monitoring For Control Systems (AREA)
Abstract
The invention relates to an accumulated flow measuring device and an accumulated flow controlling method for a nuclear power plant, which comprise the following steps: the power input end is used for connecting the power input; the signal input unit is used for connecting a flow sensor corresponding to a working valve of the nuclear power plant to acquire a flow signal of the flow sensor; the counting unit is used for receiving the flow signals to carry out accumulated counting according to the flow signals; the triggering unit is used for acquiring the flow signal type of the flow sensor to output a corresponding triggering signal; the counting mode switching unit is used for receiving the trigger signal so as to switch the counting unit into a counting mode corresponding to the type of the flow signal of the flow sensor; the counting threshold unit is used for setting a preset threshold; the first judging unit is used for judging whether the accumulated count reaches a preset threshold value or not; and the control signal generating unit is used for generating a control signal when the accumulated count reaches a preset threshold value. The invention can be applied to various measurement scenes, and has wide application range and high measurement precision.
Description
Technical Field
The invention relates to the technical field of accumulative flow measurement, in particular to an accumulative flow measurement device and an accumulative flow control method for a nuclear power plant.
Background
At present, a multi-link combined measurement and calculation mode used for realizing the accumulative flow measurement and the control function thereof in a nuclear power plant is characterized in that a core device is an old electromagnetic mechanical counter, a pulse signal is received for counting, and when the accumulative value reaches a set value, a logic turnover is realized through an internal relay to control a downstream execution mechanism (such as valve action and the like), so that the volume of the accumulative flow is controlled. In a nuclear power plant production process, such counters have the following drawbacks: the reset coil of the electromagnetic mechanical counter has requirements on pulse duty ratio and pulse level, if the pulse is too fast, the counter cannot be reset, and the pulse level cannot be counted and reset normally when fluctuating. This will result in: the volume of the accumulated flow cannot be controlled by the output signal, and the control function of the relevant process system is influenced. When the counter is in operation, a fault occurs, and the problem is difficult to find during off-line inspection, so that the maintenance cost of the system is increased.
Meanwhile, due to the inherent characteristics of the mechanical counter, abrasion, jamming and the like can occur after the mechanical counter is operated for a period of time, and the situation can be solved through manual intervention. Since the counter needs to receive the pulse signal for counting, a device for converting the analog signal into the pulse signal is arranged at the upstream of the counter. The performance of the device also determines the stable running number of the counter. When the flow is low, the condition that the output of the upstream signal conversion equipment of the counter is unstable and the pulse peak value does not reach the stable working voltage of the counter can occur, which directly results in that the counter cannot count. Under the condition of considering the reset condition of the counter, the flow needs to be increased as much as possible to ensure the reliable work of the counter.
In summary, the multi-link combined technology using an electromagnetic mechanical counter as a core in the accumulated flow measurement and control loop thereof in the nuclear power plant at present does not meet the requirement of the nuclear power plant on long-term safe and stable operation, but no equipment which meets the requirements of the site installation space and function of the nuclear power plant and can be integrally replaced exists in the market at present.
Disclosure of Invention
The invention aims to provide a nuclear power plant accumulated flow measuring device and an accumulated flow controlling method.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a nuclear power plant cumulative flow measurement device comprising:
the power input end is used for connecting the power input;
the signal input unit is used for connecting a flow sensor corresponding to a working valve of the nuclear power plant to acquire a flow signal of the flow sensor;
the counting unit is used for receiving the flow signal to carry out accumulated counting according to the flow signal;
the trigger unit is used for acquiring the flow signal type of the flow sensor to output a corresponding trigger signal;
the counting mode switching unit is used for receiving the trigger signal so as to switch the counting unit into a counting mode corresponding to the type of the flow signal of the flow sensor;
the counting threshold unit is used for setting a preset threshold;
the first judging unit is used for judging whether the accumulated count reaches the preset threshold value or not;
and the control signal generating unit is used for generating a control signal when the accumulated count reaches the preset threshold value.
Preferably, in the nuclear power plant cumulative flow rate measurement device of the present invention, the count mode includes:
a voltage counting mode for counting the voltage signals; and/or
A current counting mode for counting the current signal; and/or
A pulse counting mode for counting the pulse signals.
Preferably, in the nuclear power plant cumulative flow rate measurement device of the present invention, the voltage count mode includes:
a plurality of voltage counting modes for counting voltage signals of a plurality of different voltage ranges; and/or
The pulse counting mode includes:
a plurality of pulse counting modes for counting pulse signals of a plurality of different peak ranges and/or a plurality of different frequency ranges.
Preferably, in the nuclear power plant cumulative flow rate measurement device of the present invention, the counting unit includes:
a plurality of proportional units respectively corresponding to the voltage counting mode and the current counting mode;
and the pulse counting unit corresponds to the pulse counting mode.
Preferably, the nuclear power plant cumulative flow measuring device further comprises a small flow cutting unit and/or an isolation unit;
the small flow cutting unit is used for setting a small flow cutting value;
the counting unit is used for starting accumulation counting when the flow signal exceeds the small flow cut-off value;
the isolation unit is used for isolating the signal input unit from the power supply input end.
Preferably, the nuclear power plant cumulative flow measuring device further comprises a range setting unit, a display unit and/or;
the measuring range setting unit is used for acquiring the counting range of the counting unit according to the flow signal type of the flow sensor;
the display unit is used for displaying the current measurement information;
the authority setting unit is used for setting the operation authority of the device.
Preferably, in the nuclear power plant cumulative flow rate measurement device of the present invention, the counting unit is further configured to accumulate a count according to an upper limit value of the counting range when the flow rate signal exceeds the counting range.
Preferably, the nuclear power plant accumulated flow measuring device further comprises a signal limit value setting unit, a second judging unit and an alarming unit;
the signal limit value setting unit is used for setting the maximum value of the flow signal corresponding to the signal input unit according to the type of the flow signal of the flow sensor;
the second judging unit is used for judging whether the flow signal of the signal input end exceeds the maximum value;
the alarm unit is used for generating an alarm when the flow signal of the signal input end exceeds the maximum value.
Preferably, in the nuclear power plant cumulative flow rate measuring device of the present invention, a timing unit and a reset unit are further included;
the timing unit is used for timing the duration time of the control signal when the control signal generating unit acts;
the reset unit is used for clearing the accumulated count and resetting the control signal generating unit when the timing meets a preset value or a trigger signal is received.
The invention also provides a nuclear power plant accumulated flow control method, which is based on any one of the nuclear power plant accumulated flow measurement devices and comprises the following processes:
s1, acquiring a flow signal type of a flow sensor corresponding to a working valve of the nuclear power plant, and switching to a counting mode corresponding to the flow signal type of the flow sensor according to the flow signal type;
s2, acquiring a flow signal of the flow sensor to perform accumulated counting according to the flow signal;
and S3, outputting a control signal to control a working valve of the nuclear power plant when the accumulated count reaches a preset threshold value.
The device and the method for controlling the accumulated flow of the nuclear power plant have the following beneficial effects: the method is suitable for various measurement scenes, and has the advantages of wide application range and high measurement precision.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of an embodiment of an accumulated flow measurement device of a nuclear power plant according to the present invention;
FIG. 2 is a schematic diagram of another embodiment of an accumulated flow measurement device of a nuclear power plant according to the present invention;
FIG. 3 is a schematic diagram of another embodiment of an accumulated flow measurement device of a nuclear power plant according to the present invention;
FIG. 4 is a schematic diagram of another embodiment of an accumulated flow measurement device of a nuclear power plant according to the present invention;
FIG. 5 is a schematic diagram of another embodiment of an accumulated flow measurement device of a nuclear power plant according to the present invention;
fig. 6 is a flowchart illustrating an embodiment of a method for controlling cumulative flow in a 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.
As shown in fig. 1, in a first embodiment of an accumulated flow measuring device of a nuclear power plant according to the present invention, the device includes: the power input end is used for connecting the power input; the signal input unit 110 is used for connecting a flow sensor corresponding to a working valve of a nuclear power plant to acquire a flow signal of the flow sensor; a counting unit 120 for receiving the flow signal to perform cumulative counting according to the flow signal; a trigger unit 130, configured to acquire a flow signal type of the flow sensor to output a corresponding trigger signal; a counting mode switching unit 140 for receiving a trigger signal to switch the counting unit 120 to a counting mode corresponding to a type of a flow signal of the flow sensor; a count threshold unit 150, configured to set a preset threshold; a first judging unit 160, configured to judge whether the accumulated count reaches a preset threshold; and a control signal generating unit 170 for generating a control signal when the accumulated count reaches a preset threshold. Specifically, the measuring device is connected to an external power source through a power input terminal to supply power, and is connected to a flow sensor of a nuclear power plant through a signal input unit 110 to receive a flow signal from the flow sensor, and performs an accumulated count on the flow signal through a counting unit 120. The accumulated count is used to reflect the accumulated flow of the working valve. The triggering unit 130 is configured to output a corresponding triggering signal according to a type of a flow signal of the flow sensor, so as to trigger the counting mode switching unit 140 to switch the counting mode of the counting unit 120 through the triggering signal, so that the counting manner of the flow signal by the counting unit 120 corresponds to the type of the flow signal. The type of the flow signal of the flow sensor can be obtained according to the device type of the flow sensor. For example, the flow rate signal output by some flow rate sensors is a voltage signal, the flow rate signal output by some flow rate sensors is a current signal, and the flow rate signal output by some flow rate sensors is a pulse signal. It will be appreciated that once the model of the flow sensor is known, it can essentially know its corresponding flow signal type. The corresponding relation can be obtained by table look-up or manual confirmation. Once the counting mode of the counting unit 120 is determined, the counting unit 120 may perform a specific counting according to the flow signal to obtain an accumulated count. Meanwhile, a threshold of the accumulated count, that is, a preset threshold, may be set by the preset setting unit, the accumulated count of the counting unit 120 is determined by the first determining unit 160, and when the accumulated count reaches the preset threshold, the control signal generating unit 170 generates a control signal, which may be used to control the working valve correspondingly, for example, the working valve may be turned off by the control signal.
In one embodiment, the triggering unit 130 includes a triggering button. Specifically, the triggering unit 130 may be a triggering button, and is configured to generate different triggering signals through different triggering buttons so as to correspond to different types of flow signals.
Optionally, the counting mode includes: a voltage counting mode for counting voltage signals and/or a current counting mode for counting current signals; and/or a pulse counting mode for counting pulse signals. Specifically, the type of the flow signal output by the current general flow sensor may be a voltage signal, a current signal or a pulse signal, and the counting mode corresponding to the type of the flow signal may be a voltage counting mode, a current counting mode or a pulse counting mode. It can set up many kinds of counting mode combination, and in actual work, through counting mode switch unit 140 to switch the counting mode, select the corresponding counting mode. Wherein the counting is effective only when the flow signal type is a corresponding voltage signal and the counting is effective only when the flow signal type is a corresponding current signal and the counting is effective only when the flow signal type is a corresponding pulse counting mode,
in one embodiment, the voltage counting mode may include: a plurality of voltage counting modes for counting voltage signals of a plurality of different voltage ranges. In particular, for different flow sensors, even though the flow signals they output are all voltage signals, they may have different voltage ranges. For example, in some flow sensors, the flow signal output may range from 0.5V to 2.5 VDC. In other flow sensors, the flow signal output may be a voltage of 1 to 5 VDC. The mode in which its counting unit 120 operates also differs.
In one embodiment, the pulse counting mode comprises: a plurality of pulse counting modes for counting pulse signals of a plurality of different peak ranges and/or a plurality of different frequency ranges. That is, different peak counting modes can be set for different peaks of the pulse signal to obtain accurate pulse counting. In addition, the pulse counting mode can also allow a plurality of frequency ranges to count, such as the frequency of 0 to 500 Hz.
In one embodiment, the counting unit 120 includes: the voltage counting mode and the current counting mode respectively correspond to a plurality of proportional units; a pulse counting unit 120 corresponding to the pulse counting mode. Specifically, in the counting unit 120, the voltage counting mode and the current counting mode thereof may be set by different proportional units. For example, if the type of the currently input flow signal is 1-5VDC and the full-scale count of the counting unit 120 is set to 3600PCS/hour, then: when the input flow signal value is 3V, the counting unit 120 cumulatively calculates with 1800PCS/hour (0.5 PCS/s); when the input signal is 5V, the counting unit 120 counts up by 3600PCS/hour (lPCS/s). Wherein the counting unit 120 counts the pulse signals through the general pulse counting unit 120. For example, by an ADC conversion circuit.
Optionally, as shown in fig. 2, the accumulated flow measuring device of the nuclear power plant of the present invention further includes a small flow cutting unit 181; the small flow rate cutting unit 181 is used to set a small flow rate cutting value; the counting unit 120 is configured to start the cumulative count only when the flow signal exceeds the small flow cut-off value. In particular, it may be possible to perform a small flow cut-off depending on the input signal when it is the corresponding minimum input signal. I.e. a small flow cut-off value is set, which value can also be understood as the deviation value of the data, which corresponds to the lowest bit of the measurement signal in the lowest bit of the data. For example: the small flow cut-off value is 1.0018V, when the input signal is lower than 1.0018V, the counting unit 120 does not count, the input signal is higher than 1.0018V, and the counting unit 120 counts normally. So as to reduce the influence of the zero drift of the local signal transmitter on the accumulated counting.
Optionally, the nuclear power plant accumulated flow measuring device of the invention further comprises an isolation unit; the isolation unit is used for isolating the signal input unit from the power supply input end. The isolation device is additionally arranged between the signal input unit and the negative electrode of the power supply system aiming at different characteristics of each power supply system in the nuclear power plant, and the isolation of the equipment working power supply, the signal input unit, the counting unit and the related processing unit is realized, so that when the acquisition and counting loop relates to multi-path power supply, the interference and the connection among different power supply loops are completely cut off, and the stability of the power supply loop and the independent no-string-electricity condition of the signal input unit and the counting unit are ensured. Particularly, when the signal input power supply and the power supply are multi-path suspended power supplies in a nuclear power plant, the isolation unit can ensure that the related multi-path suspended power supplies work normally and do not generate low insulation.
Optionally, as shown in fig. 3, the accumulated flow measuring device of the nuclear power plant of the present invention further includes a span setting unit 182; the span setting unit 182 is used for acquiring the counting range of the counting unit 120 according to the flow signal type of the flow sensor. Specifically, the counting range of the counting unit 120 is set according to the type of the flow signal of the flow sensor. For example, when the flow rate signal type of the flow sensor is l-5V, the counting range of the counting unit 120 may be set to 6V, when the flow rate signal type of the flow sensor is 0.5V-2.5V, the counting range of the counting unit 120 may be set to 3V, and when the flow rate signal type of the flow sensor is 4-20mA, the counting range of the counting unit 120 may be set to 23 mA.
Further, the counting unit 120 is further configured to count up according to an upper limit value of the range setting range when the flow rate signal exceeds the range setting range. Specifically, when the flow signal value of the flow sensor exceeds the upper limit range corresponding to the signal type, the counting unit 120 still counts according to the actually measured flow signal until the flow signal reaches the upper limit of the range setting range, so as to avoid that the accumulated flow is not monitored because the signal fluctuation causes the over-range counting. For example, when the flow signal type is l-5V, the range of the counting unit 120 capable of counting is up to 6V, and when 6V is exceeded, the counting is performed at a counting speed of 6V; when the flow signal type is 0.5V-2.5V, the counting range of the counting unit 120 is up to 3V, and when the flow signal type exceeds 3V, counting is performed according to the counting speed of 3V; when the flow signal type is 4-20mA, the counting unit 120 can count up to 23mA, and when 23mA is exceeded, the counting is performed at a counting speed of 23 mA.
Optionally, the nuclear power plant accumulated flow measuring device of the invention further comprises a display unit; the display unit is used for displaying the current measurement information. Specifically, the display unit can adopt three lines of LCD screen to display the measurement state and data information in the measurement process, and the display unit can specifically include input signal type and relay excitation state, can clearly express the information such as the current output condition, the current measured value, the set cumulative count value, the current cumulative count value, and utilize the advantage that the LCD screen life is long-lived simultaneously, avoid the screen ageing inhomogeneous to lead to the picture to show incompletely.
Optionally, the nuclear power plant accumulated flow measuring device further comprises an authority setting unit; the permission setting unit is used for limiting the operation permission of the device, specifically, the advanced permission of function setting can be added, so that parameter errors such as input signal types, proportion setting and the like of the testing device caused by human errors can be avoided, a function setting interface needs to input a password to enter, and modifiable personnel are limited.
Optionally, as shown in fig. 4, the nuclear power plant cumulative flow measurement device of the present invention further includes a signal limit setting unit 183, a second judgment unit 184, and an alarm unit 185; the signal limit setting unit 183 is configured to set a maximum value of the flow signal corresponding to the signal input unit 110 according to the type of the flow signal of the flow sensor; the second judging unit 184 is configured to judge whether the flow signal at the signal input end exceeds the maximum value; the alarm unit 185 is adapted to generate an alarm when the flow signal at the signal input exceeds a maximum value. Specifically, the measuring device is provided with an alarm for exceeding an input signal, for example, when the flow signal is set to exceed a corresponding maximum value, the alarm is given through buzzing, so that the measurement of the accumulated flow and whether a control loop normally works can be monitored at any time, the friendliness of human-computer interaction of the measuring device is improved, and the risk of human error is reduced.
Optionally, as shown in fig. 5, the nuclear power plant cumulative flow measurement device of the present invention further includes a timing unit 186 and a reset unit 187; the timing unit 186 is configured to time the duration of the control signal when the control signal generating unit 170 is activated; the reset unit 187 is configured to clear the accumulated count and reset the control signal generating unit 170 when the timing satisfies a predetermined value or receives a trigger signal. Specifically, it may be realized by the reset unit 187 to clear the accumulated count of the count unit 120. Specifically, the operation time of the control signal generation unit 170 may be measured, and when the measured time satisfies a requirement, the reset unit 187 may reset the operation time and clear the real-time flow rate value to restart the cumulative measurement. Wherein the control signal generation unit 170 may trigger the generated threshold control signal for the relay action. At this time, the reset time of the reset unit 187 may be set, for example, n seconds, and if the accumulated flow reaches the set threshold, the reset unit 187 triggers the reset of the control signal generation unit 170 after the control signal generation unit 170 is operated and held for n seconds. In addition, the reset unit 187 may also receive a manual trigger signal for resetting. The multiple trigger modes of the reset unit 187 meet the requirements of different working conditions of the nuclear power plant, such as quantitative accumulated flow measurement under a normal working condition and the need of resetting the current count value at any time under an emergency working condition.
As shown in fig. 6, a nuclear power plant cumulative flow control method according to the present invention is implemented by the above nuclear power plant cumulative flow measurement device, and includes: s1, acquiring a flow signal type of a flow sensor corresponding to a working valve of the nuclear power plant, and switching to a counting mode corresponding to the flow signal type of the flow sensor according to the flow signal type; specifically, when the measuring device is connected to a flow sensor corresponding to a working valve of a nuclear power plant, the type of the flow signal of the flow sensor is determined, and the type of the flow signal of the flow sensor can be determined specifically according to the type of the flow sensor, so as to obtain the type of the flow signal of the flow sensor, for example, to confirm that the flow signal is a current signal, a voltage signal or a pulse signal. It will also be appreciated that where it is a voltage signal, its particular voltage signal is determined, identifying the particular signal type, for example, in some flow sensors, it may output a flow signal in the range of 0.5V to 2.5 VDC. In other flow sensors, the flow signal output may be a voltage of 1 to 5 VDC. A specific judgment is required. After confirming the flow signal type of the flow sensor, it can set the counting mode of the measuring device according to the flow signal type.
S2, acquiring a flow signal of the flow sensor to perform accumulated counting according to the flow signal; specifically, after the counting mode of the measuring device is set, the flow rate can be counted up based on the flow rate signal of the flow rate sensor.
And S3, outputting a control signal to control a working valve of the nuclear power plant when the accumulated count reaches a preset threshold value. Specifically, during the cumulative count process, the cumulative count is monitored. When the accumulated count value of the measuring device reaches a preset threshold value, a control signal can be output to control a working valve of the nuclear power plant to be turned off.
In the measuring device and the corresponding measuring control method, in the process system adopting the sequence control mode, the stable counting and logic turnover ensure the continuous operation of the sequence control.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A nuclear power plant cumulative flow measurement device, comprising:
the power input end is used for connecting the power input;
the signal input unit is used for connecting a flow sensor corresponding to a working valve of the nuclear power plant to acquire a flow signal of the flow sensor;
the counting unit is used for receiving the flow signal to carry out accumulated counting according to the flow signal;
the trigger unit is used for acquiring the flow signal type of the flow sensor to output a corresponding trigger signal;
the counting mode switching unit is used for receiving the trigger signal so as to switch the counting unit into a counting mode corresponding to the type of the flow signal of the flow sensor;
the counting threshold unit is used for setting a preset threshold;
the first judging unit is used for judging whether the accumulated count reaches the preset threshold value or not;
and the control signal generating unit is used for generating a control signal when the accumulated count reaches the preset threshold value.
2. The nuclear power plant cumulative flow measurement device of claim 1, wherein said count mode comprises:
a voltage counting mode for counting the voltage signals; and/or
A current counting mode for counting the current signal; and/or
A pulse counting mode for counting the pulse signals.
3. The nuclear power plant cumulative flow measurement device of claim 2, wherein said voltage count mode comprises:
a plurality of voltage counting modes for counting voltage signals of a plurality of different voltage ranges; and/or
The pulse counting mode includes:
a plurality of pulse counting modes for counting pulse signals of a plurality of different peak ranges and/or a plurality of different frequency ranges.
4. The nuclear power plant cumulative flow measurement device of claim 2, wherein said counting unit comprises:
a plurality of proportional units respectively corresponding to the voltage counting mode and the current counting mode;
and the pulse counting unit corresponds to the pulse counting mode.
5. The nuclear power plant cumulative flow measurement device of claim 1, further comprising a small flow cut-off unit and/or an isolation unit;
the small flow cutting unit is used for setting a small flow cutting value;
the counting unit is used for starting accumulation counting when the flow signal exceeds the small flow cut-off value;
the isolation unit is used for isolating the signal input unit from the power supply input end.
6. The nuclear power plant cumulative flow measurement device of claim 1, further comprising a range setting unit, a display unit and/or a permission setting unit;
the measuring range setting unit is used for acquiring the counting range of the counting unit according to the flow signal type of the flow sensor;
the display unit is used for displaying the current measurement information;
the authority setting unit is used for limiting the operation authority of the device.
7. The nuclear power plant cumulative flow measurement device of claim 6, wherein said counting unit is further configured to accumulate a count according to an upper limit of said count range when said flow signal exceeds said count range.
8. The nuclear power plant cumulative flow measurement device of claim 1, further comprising a signal limit setting unit, a second determination unit, and an alarm unit;
the signal limit value setting unit is used for setting the maximum value of the flow signal corresponding to the signal input unit according to the type of the flow signal of the flow sensor;
the second judging unit is used for judging whether the flow signal of the signal input end exceeds the maximum value;
the alarm unit is used for generating an alarm when the flow signal of the signal input end exceeds the maximum value.
9. The nuclear power plant cumulative flow measurement device of claim 1, further comprising a reset unit and a timing unit;
the timing unit is used for timing the duration time of the control signal when the control signal generating unit acts;
the reset unit is used for clearing the accumulated count and resetting the control signal generating unit when the timing meets a preset value or a trigger signal is received.
10. A method for controlling cumulative flow rate of a nuclear power plant, which is based on the device for measuring cumulative flow rate of a nuclear power plant of any one of claims 1 to 9, and comprises the following steps:
s1, acquiring a flow signal type of a flow sensor corresponding to a working valve of the nuclear power plant, and switching to a counting mode corresponding to the flow signal type of the flow sensor according to the flow signal type;
s2, acquiring a flow signal of the flow sensor to perform accumulated counting according to the flow signal;
and S3, outputting a control signal to control a working valve of the nuclear power plant when the accumulated count reaches a preset threshold value.
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