CN111599502B - Automatic water filling and calibrating device for liquid level switch - Google Patents
Automatic water filling and calibrating device for liquid level switch Download PDFInfo
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- CN111599502B CN111599502B CN202010289583.XA CN202010289583A CN111599502B CN 111599502 B CN111599502 B CN 111599502B CN 202010289583 A CN202010289583 A CN 202010289583A CN 111599502 B CN111599502 B CN 111599502B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D1/00—Details of nuclear power plant
- G21D1/04—Pumping arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The invention belongs to the technical field of liquid level switch marking, and particularly relates to an automatic water filling and calibrating device for a liquid level switch (18), which is used for calibrating the liquid level switch (18) and comprises a water filling device for filling water into the liquid level switch (18), an MN pressure difference type liquid level measuring instrument (5) for recording the water level of the liquid level switch (18), and a PLC control system (4) connected with the water filling device, the MN pressure difference type liquid level measuring instrument (5) and the liquid level switch (18). The device can reduce the labor and time cost and improve the debugging working efficiency; the liquid level switch calibration device has the characteristics of high calibration precision, convenience in movement, easiness in operation and the like, can finish the calibration work of the liquid level switch (18) by only 1-2 persons, and can shorten the debugging period.
Description
Technical Field
The invention belongs to the technical field of liquid level switch marking, and particularly relates to an automatic water filling and calibrating device for a liquid level switch.
Background
The liquid level switch (SN for short), also called water level switch, liquid level sensor, as the name suggests, is the switch used for controlling the liquid level. The form is largely classified into a contact type and a non-contact type. The common non-contact type liquid level switch has a capacitance type liquid level switch, and the contact type liquid level switch is most widely applied. The nuclear power plant uses a large number of liquid level switches to control the liquid level and alarm of a process system, and after the liquid level switches are installed in place on site, the liquid level switches need to be calibrated by simulating the operation condition so as to verify the manufacturing quality and the installation quality and verify whether the liquid level switches can act at the liquid level value specified by design.
The liquid level switches are calibrated by manual irrigation in the debugging and testing process of the nuclear power plant, and the method has the defects of long construction period, large error, large required manpower and the like. The calibration of watering mainly is to water in to the compensating tank through interim transparent hose, because of the opaque unable liquid level of observing of compensating tank, can only confirm the liquid level to the compensating tank along the line through observing the liquid level in the hose, slowly improve the liquid level and reach the alarm value, the liquid level value of record this moment, there is measuring error big, inefficiency, consume the manpower scheduling problem at this in-process.
According to preliminary statistics, M310 one unit liquid level switch relates to 672 units in total of 37 systems. The number of liquid level switches of one unit of Hualong is estimated to reach 1000. Each liquid level switch needs to be watered and calibrated in the debugging process, so that a large amount of manpower and material resources are consumed. In addition, many difficulties can be encountered in the manual water filling process of the liquid level switch, such as the liquid level switch is in the high altitude, the operation space is narrow, and the like.
The liquid level switch adopts a floating ball type working principle, and the nuclear power liquid level switch is specified by a design specification, and the liquid level switch starts to act within 0.5cm of an alarm set point and resets within 2cm of a starting point. In any case, the reset value should meet the requirements of process control, which has high requirements on the precision of field debugging and setting. The manual irrigation error is too large, and the problem can be solved by adopting the tool for irrigation.
The nuclear power plant is internally provided with an external float type liquid level switch, and the debugging of the liquid level switch adopts a manual irrigation method to carry out secondary verification on the liquid level switch. Debugging personnel usually adopt simple temporary device to carry out the calibration of watering, and temporary device comprises a transparent hose, a hose nipple, a transparent jar body that catchments. The current debugging method comprises the following steps: before the liquid level switch is set, marking the zero point of the irrigation body at the position of the liquid level switch cylinder, connecting one end of a hose of the irrigation device with a liquid level switch drain valve (an upper root valve is opened, a lower root valve is closed) after marking the zero point, and connecting the other end of the hose with a water collection tank body. After the water level switch is ready, the water collection tank body is translated to the position of the liquid level switch cylinder body and is contrasted with a zero point line, water is slowly filled into the water collection tank body, the triggering condition of the liquid level switch is concerned at any time, when the liquid level switch is triggered, the liquid level of the water collection tank body when the alarm is triggered is translated to the liquid level switch cylinder body and is marked, and the distance between the marked position and the zero point is the alarm value of the liquid level switch; after the alarm is triggered, the water collecting tank body is vertically and slowly lifted or lowered, the situation that the alarm disappears is concerned, when the alarm disappears, the liquid level of the water collecting tank body when the alarm disappears is translated to the liquid level switch cylinder body and marked, and the distance between the marked position and the zero point is the reset value of the liquid level switch alarm. Because the probability of the operator misoperation is higher, 3 times of repeated measurement is needed for the same liquid level switch alarm value, and multiple operations of irrigation, attention liquid level alarm, marking measurement and the like are needed to be carried out simultaneously in a multi-person cooperation mode, and the irrigation setting method is low in efficiency comprehensively.
The method has the defects of long construction period, large error, labor consumption and the like when used for testing, and is also reflected in the following aspects. The liquid level switches in the nuclear power plant are mostly set at steam drain bags, the steam drain bags are generally arranged higher in a plant area, the space of part of the liquid level switches is narrow, water is required to be manually taken and irrigated during irrigation operation, and the setting by using the device is very inconvenient. From the aspect of measurement accuracy, the liquid level is looked at level by naked eyes when marking the operation, and the water-collecting tank body and the SN cylinder body are not marked with scales, so that measurement deviation is easily caused. From the aspect of test efficiency, the bundled hose and the joint of the SN sewage discharge pipeline are required to be separated after the SN liquid level is set, the next SN is bundled again, water leakage can occur at the joint when the SN is not tightly bundled and is irrigated sometimes, and therefore the situation of repeatedly detaching and bundling can occur.
Disclosure of Invention
Aiming at the defects of manual water filling calibration of a liquid level switch in the process of debugging and testing of a nuclear power plant at present, the invention aims to provide a simple device capable of automatically taking water, filling water and automatically calibrating in the process of water filling calibration of the liquid level switch.
In order to achieve the above purpose, the invention adopts the technical scheme that the automatic water filling and calibrating device for the liquid level switch is used for calibrating the liquid level switch, and comprises a water filling device for filling water into the liquid level switch, an MN pressure difference type liquid level measuring instrument for recording the water level of the liquid level switch, and a PLC control system connected with the water filling device, the MN pressure difference type liquid level measuring instrument and the liquid level switch.
Further, the PLC control system controls the water filling device to sequentially perform water filling operation and water draining operation on the liquid level switch, and controls the MN differential pressure type liquid level measuring instrument to record a first liquid level value and a second liquid level value of the liquid level switch; the first liquid level value refers to a liquid level value at which the liquid level switch is triggered to generate an alarm during the irrigation operation, and the second liquid level value refers to a liquid level value at which the liquid level switch releases the alarm during the drainage operation.
Furthermore, the water filling device comprises a water tank, a three-way electromagnetic valve, a third pipeline, a first pipeline and a second pipeline, wherein the three-way electromagnetic valve is provided with an A port, a B port and a C port, the third pipeline is connected with the liquid level switch and the A port, the first pipeline is connected with the water tank and the B port and is provided with a first electric pump, the second pipeline is connected with the water tank and the C port, the PLC control system controls the opening and closing of the A port, the B port and the C port of the three-way electromagnetic valve, and the PLC control system controls the stop of the first electric pump.
Furthermore, a fifth valve and a sixth valve are arranged on the third pipeline in series, and the fifth valve is close to the liquid level switch.
Further, the differential liquid level measurement appearance of MN passes through the fourth line connection and is in on the third pipeline, the fourth line connection be in the fifth valve with between the sixth valve on the third pipeline, be equipped with the fourth valve on the fourth pipeline.
Further, the first electric pump is started manually.
Further, the bottom of the water tank is also provided with a second valve for sewage discharge, and the top of the water tank is also provided with a third valve for exhaust.
Further, the volume of the water tank is more than or equal to 10L.
Further, still including being used for the water intaking device of water tank moisturizing, the water intaking device is including connecting the fifth pipeline of water tank and outside water source, be equipped with second electric pump and first valve on the fifth pipeline, first valve is located the second electric pump with between the water tank.
Further, the second electric pump is provided with a storage battery, and the second electric pump is started manually and is provided with a running time fixed value.
The invention has the beneficial effects that:
1. the automatic water filling and calibrating device of the liquid level switch can reduce the labor and time cost and improve the debugging working efficiency; the calibration work of the SN can be completed by only 1-2 persons, and the debugging period can be shortened.
2. The method has the characteristics of high calibration precision, convenience in movement, easiness in operation and the like.
Drawings
FIG. 1 is a schematic diagram of an automatic water level filling and calibrating device with a liquid level switch according to an embodiment of the present invention;
FIG. 2 is a schematic logic control diagram of an automatic priming and calibration device for a liquid level switch according to an embodiment of the present invention;
in the figure: the automatic liquid level measuring device comprises a water tank 1, a first electric pump 2, a second electric pump 3, a PLC 4, a differential pressure type liquid level measuring instrument 5-MN, a three-way electromagnetic valve 6, a first valve 7, a second valve 8, a third valve 9, a fourth valve 10, a fifth valve 11, a sixth valve 12, a first pipeline 13, a second pipeline 14, a third pipeline 15, a fourth pipeline 16, a fifth pipeline 17 and a liquid level switch 18.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1, the automatic water filling and calibrating device for a liquid level switch provided by the invention is used for calibrating a liquid level switch 18 (SN for short), and comprises a water filling device for filling water into the liquid level switch 18, an MN differential pressure type liquid level measuring instrument 5 (MN for short) for recording the water level of the liquid level switch 18, and a PLC control system 4 connected with the water filling device, the MN differential pressure type liquid level measuring instrument 5 and the liquid level switch 18.
The PLC control system 4 controls the water filling device to sequentially perform water filling operation and water draining operation on the liquid level switch 18, and controls the MN pressure difference type liquid level measuring instrument 5 to record a first liquid level value and a second liquid level value of the liquid level switch 18; the first level value refers to a level value at which the level switch 18 is triggered to generate an alarm during a water filling operation, and the second level value refers to a level value at which the level switch 18 is released from the alarm during a water draining operation.
The irrigation device comprises a water tank 1, a three-way electromagnetic valve 6 provided with an A port, a B port and a C port, a third pipeline 15 connected with a liquid level switch 18 and the A port, a first pipeline 13 connected with the water tank 1 and the B port and provided with a first electric pump 2, a second pipeline 14 connected with the water tank 1 and the C port, a PLC control system 4 controlling the opening and closing of the A port, the B port and the C port of the three-way electromagnetic valve 6, and the PLC control system 4 controlling the stop of the first electric pump 2.
A fifth valve 11 and a sixth valve 12 are arranged in series on the third line 15, the fifth valve 11 being close to the level switch 18.
MN differential pressure type liquid level measuring instrument 5 is connected to a third pipeline 15 through a fourth pipeline 16, the fourth pipeline 16 is connected to the third pipeline 15 between a fifth valve 11 and a sixth valve 12, and a fourth valve 10 is arranged on the fourth pipeline 16.
The first electric pump 2 is started manually.
The bottom of the water tank 1 is also provided with a second valve 8 for sewage disposal, and the top of the water tank 1 is also provided with a third valve 9 for exhaust. The volume of the water tank 1 is more than or equal to 10L.
The water supply device comprises a fifth pipeline 17 (the length of the fifth pipeline 17 is determined according to the actual situation on site) for connecting the water tank 1 and an external water source, a second electric pump 3 and a first valve 7 are arranged on the fifth pipeline 17, and the first valve 7 is positioned between the second electric pump 3 and the water tank 1. The second electric pump 3 is equipped with a storage battery, and the second electric pump 3 is started manually and is provided with a fixed running time value.
The automatic water filling and calibrating device for the liquid level switch provided by the invention has the following functions (the logic control schematic diagram of the automatic water filling and calibrating device for the liquid level switch is shown in figure 2):
automatic water intaking function:
the water pumped by the second electric pump 3 is discharged into the water tank 1, and when the water level of the water tank 1 reaches a certain water level, the pump is automatically stopped, so that the function of automatically taking water is achieved. The pump has a preset running time fixed value when being delivered from a factory, for example, the pump can be automatically stopped after running for one minute, and meanwhile, the pump also has a manual pump stopping function, and if the water quantity of the water tank 1 is insufficient, a starting button of the second electric pump 3 is clicked.
The automatic water filling function:
before the operation of watering, be connected liquid level switch 18's signal outgoing line and PLC control system 4 earlier, at the B port of the exit linkage three solenoid valve 6 of first electric pump 2, simultaneously through the action of PLC control system 4 control three solenoid valve 6, make the A port and the B port of three solenoid valve 6 communicate, liquid level switch 18 triggers the warning when the operation of watering reaches the calibration position (calibration position is liquid level that liquid level switch 18 is triggered and is produced the warning, also be the liquid level of first liquid level value), through the automatic shutdown first electric pump 2 of PLC control system 4, simultaneously through the action of PLC control system 4 control three solenoid valve 6, make the A port and the C port of three solenoid valve 6 communicate, begin the drainage operation. Therefore, water in the liquid level switch 18 is discharged into the water tank 1 through the port A and the port C of the three-way electromagnetic valve 6, the water level in the liquid level switch 18 is lowered, and when the water level in the liquid level switch 18 reaches the trigger disappearing position (the trigger disappearing position is the liquid level at which the liquid level switch 18 releases the alarm, namely the liquid level of the second liquid level value), the port A and the port C of the three-way electromagnetic valve 6 are closed, so that the purpose of automatic water filling is achieved.
Automatic calibration (reading) function:
before calibration, the MN differential pressure level gauge 5 needs to be moved so that normal readings can be taken on the ground. In addition, a signal outgoing line of the liquid level switch 18 is connected with the PLC control system 4, when the liquid level switch 18 triggers alarm or relieves alarm (namely triggering disappears), the first liquid level value and the second liquid level value are respectively measured and recorded by the MN differential pressure type liquid level measuring instrument 5 through the PLC control system 4, and therefore the function of automatically calibrating reading is achieved.
The device according to the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can derive other embodiments according to the technical solutions of the present invention, and also belong to the technical innovation scope of the present invention.
Claims (6)
1. The utility model provides an automatic watering of liquid level switch and calibration device for demarcate liquid level switch (18), characterized by: the device comprises a water filling device for filling water to the liquid level switch (18), an MN pressure difference type liquid level measuring instrument (5) for recording the water level of the liquid level switch (18), and a PLC control system (4) connected with the water filling device, the MN pressure difference type liquid level measuring instrument (5) and the liquid level switch (18);
the PLC control system (4) controls the water filling device to sequentially perform water filling operation and water draining operation on the liquid level switch (18), and controls the MN differential pressure type liquid level measuring instrument (5) to record a first liquid level value and a second liquid level value of the liquid level switch (18); the first liquid level value refers to a liquid level value that the liquid level switch (18) is triggered to generate an alarm during the water filling operation, and the second liquid level value refers to a liquid level value that the liquid level switch (18) releases the alarm during the water draining operation;
the irrigation device comprises a water tank (1), a three-way electromagnetic valve (6) provided with an A port, a B port and a C port, a third pipeline (15) connected with the liquid level switch (18) and the A port, a first pipeline (13) connected with the water tank (1) and the B port and provided with a first electric pump (2), and a second pipeline (14) connected with the water tank (1) and the C port, wherein the PLC control system (4) controls the opening and closing of the A port, the B port and the C port of the three-way electromagnetic valve (6), and the PLC control system (4) controls the stop of the first electric pump (2);
a fifth valve (11) and a sixth valve (12) are arranged on the third pipeline (15) in series, and the fifth valve (11) is close to the liquid level switch (18);
MN differential pressure type liquid level measuring instrument (5) is connected through fourth pipeline (16) on third pipeline (15), fourth pipeline (16) is connected fifth valve (11) with between sixth valve (12) on third pipeline (15), be equipped with fourth valve (10) on fourth pipeline (16).
2. The automatic water filling and calibrating device for the liquid level switch as claimed in claim 1, wherein: the first electric pump (2) is started manually.
3. The automatic water filling and calibrating device for the liquid level switch as claimed in claim 1, wherein: the bottom of the water tank (1) is also provided with a second valve (8) for sewage discharge, and the top of the water tank (1) is also provided with a third valve (9) for exhaust.
4. The automatic water filling and calibrating device for the liquid level switch as claimed in claim 1, wherein: the volume of the water tank (1) is more than or equal to 10L.
5. The automatic water filling and calibrating device for the liquid level switch as claimed in claim 1, wherein: still including being used for giving the water intake device of water tank (1) moisturizing, water intake device is including connecting water tank (1) and outside water source's fifth pipeline (17), be equipped with second electric pump (3) and first valve (7) on fifth pipeline (17), first valve (7) are located second electric pump (3) with between water tank (1).
6. The automatic water filling and calibrating device for the liquid level switch as claimed in claim 5, wherein: the second electric pump (3) is provided with a storage battery, and the second electric pump (3) is started manually and is provided with a running time fixed value.
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| CN202010289583.XA CN111599502B (en) | 2020-04-14 | 2020-04-14 | Automatic water filling and calibrating device for liquid level switch |
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| CN202010289583.XA CN111599502B (en) | 2020-04-14 | 2020-04-14 | Automatic water filling and calibrating device for liquid level switch |
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| CN111599502B true CN111599502B (en) | 2023-01-17 |
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| CN113686408A (en) * | 2021-07-16 | 2021-11-23 | 中广核核电运营有限公司 | Nuclear power unit auxiliary water supply tank switch constant value verification device without climbing operation |
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2020
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