CN211504342U - Float type liquid level switch automatic calibration device - Google Patents

Abstract

The utility model relates to a buoy type liquid level switch overhauls the field, concretely relates to buoy type liquid level switch automatic check-up device. In the utility model, the device water tank and the container to be tested are connected with the hydraulic pipeline module; the hydraulic pipeline module is connected with the measurement control module; the measurement control module is connected with the central processing module, and the central processing module is connected with the upper computer. The measurement control module comprises a pressure test module, a switching value test module, a pressurization module, a quick drainage module, a proportional control valve control module and an emergency stop protection module. The calibration device can calibrate the switch after the system is isolated, and simultaneously, the device can fill water and exhaust the field instrument, so that the instrument indication fluctuation caused by instrument pipeline gas accumulation after the system is on line is avoided. The instrument pipeline can be washed, and the problem that the instrument is abnormal due to sand blockage of the pipeline is avoided.

Description

Float type liquid level switch automatic calibration device

Technical Field

The invention relates to the field of maintenance of float type liquid level switches, in particular to an automatic calibration device for a float type liquid level switch.

Background

During the normal operation of the unit, the auxiliary water supply system is used as a backup water source of the steam generator; when the normal main water supply system fails, the auxiliary water supply system supplies water to the secondary side of the steam generator, the waste heat of the reactor core is removed, and the reactor is cooled until the waste heat removal system is put into operation. A plurality of large-volume containers are arranged in the auxiliary water supply system, and float type liquid level switches are arranged in the containers and used for monitoring the water levels of the containers and generating alarm signals of different water level states according to the current liquid levels.

The float type liquid level switch of the auxiliary water supply system of the nuclear power station has a fixed value inspection item in a maintenance outline, the liquid level switch is fixed on the float and cannot move when being installed, and operating personnel are required to fill and drain water in the water tank to verify the fixed value of the liquid level switch. The inspection of conventional switch definite value adopts artifical manual drainage of filling, and artifical record pressure transmitter data through the conversion, reachs the liquid level height and then judges whether qualified liquid level switch, and the time limit for a project is comparatively nervous during the overhaul of nuclear power plant, and this type of inspection of switch definite value requires than higher to the window, and the overhaul period if the inspection of switch definite value is unqualified for the first time, need fill the drainage again after the adjustment and verify, can lead to this work to become the key path. Through verification for many times, the water tank of about 450L needs 12 hours for water filling and draining once, the conventional verification mode increases the verification period, more manual operation steps reduce the working efficiency, and more human errors are easily caused.

Aiming at the problems, the invention provides a set of automatic checking device suitable for the domestic nuclear power plant for checking the float type liquid level switch in the auxiliary water supply system of the nuclear power plant by combining the domestic nuclear power market demands. The device can also be used for checking the liquid level switch in a water tank with larger volume in other systems or other industries.

Disclosure of Invention

1. The purpose is as follows:

the invention aims to provide an automatic checking device of a float type liquid level switch, which can detect actual action values when a plurality of float type liquid level switches in a target container are triggered, compare the actual action values with set values of the liquid level switches, further judge whether deviation between the actual action values and the set values is within an error allowable range, automatically record related data and generate reports to match with function checking work of the liquid level switches. The calibration device can calibrate the switch after the system is isolated, and simultaneously, the device can fill water and exhaust the field instrument, so that the instrument indication fluctuation caused by instrument pipeline gas accumulation after the system is on line is avoided. The instrument pipeline can be washed, and the problem that the instrument is abnormal due to sand blockage of the pipeline is avoided.

2. The technical scheme is as follows:

in a float-type liquid level switch automatic calibration device: the device water tank and the container to be tested are connected with the hydraulic pipeline module; the hydraulic pipeline module is connected with the measurement control module; the measurement control module is connected with the central processing module, and the central processing module is connected with the upper computer.

The measurement control module comprises a pressure test module, a switching value test module, a pressurization module, a quick drainage module, a proportional control valve control module and an emergency stop protection module; the hydraulic pipeline module inputs signals into the pressure testing module and the switching value testing module; and signal interaction exists among the four modules, namely the pressurization module, the quick drainage module, the proportional control valve control module and the emergency stop protection module, and the hydraulic pipeline module.

The central processing module comprises a signal acquisition module, a driving control module and a data processing module; the pressure testing module and the switching value testing module input signals to the signal acquisition module; the driving control module inputs signals into the pressurization module, the quick drainage module and the proportional control valve control module; the emergency stop protection module inputs signals to the drive control module.

The signal acquisition module inputs signals to the data processing module, and the data processing module and the drive control module are in signal interaction.

And the data processing module is in signal interaction with the upper computer.

And the container to be tested and the hydraulic pipeline module are in signal interaction.

And the container to be tested, the hydraulic pipeline module and the pit are connected.

The pressure testing module is located at the joint of the container to be tested and the hydraulic pipeline module, and the switching value testing module is connected with a liquid level switch in the container to be tested.

3. The effect is as follows:

by adopting the patent technology of the invention to check the liquid level switch of the auxiliary water supply system, the following results can be achieved:

1) the switch can be automatically checked after the system is isolated;

2) the calibration device can fill water and exhaust gas for the field instrument, so that the instrument indication fluctuation caused by instrument pipeline gas accumulation after the system is on line is avoided;

3) the liquid level height is collected in real time and a curve is generated, so that analysis and comparison are facilitated;

4) the checking device can automatically check a plurality of float type liquid level switches, and by comparing set values,

judging whether the error is out of tolerance or not and automatically displaying whether the error is qualified or not;

5) after the verification is finished, the test curve and the result can be stored, a word version test report is automatically formed, and a conclusion is given;

the software and hardware of the checking device are provided with overpressure protection and data abnormity prompt, so that human errors can be reduced.

Drawings

FIG. 1 is a schematic diagram of the overall connection of an automatic verification device

FIG. 2 is a schematic diagram of an automatic verification device system

In the figure: 1. the device comprises a calibration device water tank 2, a hydraulic pipeline module 3, a measurement control module (301, a pressure test module, a 302 switching value test module, a 303 pressurization module, a 304 rapid drainage module, a 305 proportion regulating valve control module and a 306 emergency stop protection module) 4, a signal acquisition module 5, a drive control module 6, a data processing module 7, an upper computer 8 and a container to be tested.

Detailed Description

The invention provides an automatic checking device of a float-type liquid level switch, which mainly comprises a checking platform, a hydraulic pipeline system and an electric control and acquisition system.

The calibration stand and the hydraulic pipeline system are the basis of the device, the hydraulic pipeline system mainly comprises a water tank, a stainless steel instrument pipeline, an instrument isolation valve, a stainless steel connector and other equipment, the functions of storing, outputting, refluxing, isolating and the like of demineralized water are completed, a hardware environment is provided for controlling the height of the liquid level in the container, and the device has good sealing performance.

The electric control and acquisition system mainly comprises a pressure sensor, a digital display meter, a booster pump, an electric proportional valve, an electromagnetic valve and a data acquisition and processing unit. The pressure value of the bottom of the container to be measured is collected in real time through a pressure sensor positioned at the bottom of the container, and the pressure value is converted into the liquid level height of the current container to be displayed in a software interface of an upper computer; and stopping draining water when the liquid level switch acts, transmitting the actual action value to the upper computer, and comparing the action value with the set value by the upper computer through operation to obtain a conclusion and generate a report.

The water tank 1 of the checking device is connected with the hydraulic pipeline module 2, the system is pressurized by the pressurization module 303, then the system passes through the hydraulic pipeline module 2 and the measurement control module 3, and then the system is conveyed to the container 8 to be tested, so that the water filling process is completed; the container 8 to be measured is connected with the hydraulic pipeline module 2, water is discharged to a pit through the measurement control module 3, in the water discharging process, the signal acquisition module acquires pressure and switching value signals, and the driving control module 5 controls the quick water discharging module 304 and the proportional control valve control module 305 to realize quick water discharging and small-flow water discharging;

the pressure testing module 301 is positioned at the joint of the container to be tested 8 and the hydraulic pipeline module 2, provides pressure in the container to be tested 8 for the system, and the signal acquisition module 4 transmits data of the pressure testing module 301 to the data processing module 6;

the switching value testing module 302 is connected with a liquid level switch in the container 8 to be tested and collects the switching value when the liquid level switch acts;

the emergency stop protection module 306 performs emergency stop protection on the whole verification device;

the signal acquisition module 4 is connected with the pressure test module 301 and the switching value test module 302, the drive control module 5 is connected with the pressurization module 303, the quick drainage module 304, the proportional control valve control module 305 and the emergency stop protection module 306, the data processing module 6 receives an instruction of the upper computer 7, outputs corresponding signals to the pressurization module 303, the quick drainage module 304, the proportional control valve control module 305 and the emergency stop protection module 306 to control the actions of the signals, and sends the converted signals to the upper computer 7 through the Ethernet through the data processing module 6;

the upper computer 7 is connected with the data processing module 6 through the Ethernet, and the upper computer 7 receives the signals of the data processing module 6 and analyzes, processes, displays, stores, reports and the like the signals.

The present invention is described in detail below with reference to fig. 1 and 2.

When the automatic checking device is used, the device water tank 1 is filled with demineralized water after the device water tank 1 is correctly connected with the hydraulic pipeline module 2, the hydraulic pipeline module 2 is correctly connected with the container 8 to be tested, the container 8 to be tested is correctly connected with the pressure testing module 301 and the switching value testing module 302;

sending a pressurization instruction through the upper computer 7, carrying out water filling, air exhausting and flushing treatment on the calibration device and the system pipeline, and stopping operation when no bubble emerges in a transparent hose at the joint of the hydraulic pipeline module 2 and the pit;

send the automatic check-up instruction through host computer 7, defeated to the container 8 that awaits measuring with demineralized water behind pressurization module 303 through hydraulic pressure pipeline module 2, the pressure boost in-process, the liquid level switch in the container that awaits measuring carries out the switching action according to the change of liquid level, and the pressure test module 301 gathers the pressure variation of filling the water in-process in real time at this in-process, converts into the liquid level height through signal acquisition module 4 and data processing module 6 and shows in host computer 7. When a liquid level switch in the container to be tested 8 acts, the switching value testing module 302 detects a switching action signal of the liquid level switch, feeds the signal back to the signal acquisition module 4, feeds the signal back to the upper computer after passing through the data processing module 6, and obtains an action value and a corresponding curve when the liquid level switch acts. When the liquid level of the container 8 to be tested reaches the set maximum value, the calibration device automatically stops pressurizing, a water entering and draining instruction is sent out through the upper computer 7, the driving control module 5 feeds back signals to the quick draining module 304, quick draining begins to be carried out, in order to obtain a more accurate liquid level switch action value, the data processing module 6 sets that when the liquid level reaches a position near the set value of the liquid level switch, the pressure testing module 301 feeds back the signals to the upper computer 7, the driving control module 5 closes the quick draining module 304, the proportional control valve control module 305 is opened to enter small-flow draining, when the liquid level switch acts, the signal collecting module 4 collects data of the pressure testing module 301 and the switching value testing module 302 and feeds back the data to the data processing and then displays the data on the upper computer, and if the liquid level switch action value is out. And after all the liquid level switches in the container 8 to be tested are checked, the upper computer 7 analyzes whether each liquid level switch is qualified or not, and synthesizes a curve of liquid level change in the water filling and draining process in the checking process and the trend and action value corresponding to the action of the liquid level switches.

After the verification is finished, the upper computer 7 can automatically generate a word version verification report which comprises a liquid level height change curve, a liquid level switch action value and a liquid level switch verification result.

Claims (8)

1. The utility model provides a buoy type liquid level switch automatic check device which characterized in that: the calibration device water tank (1) and the container to be tested (8) are connected with the hydraulic pipeline module (2); the hydraulic pipeline module (2) is connected with the measurement control module (3); the measurement control module (3) is connected with the central processing module, and the central processing module is connected with the upper computer (7).

2. The float-type level switch automatic calibration device of claim 1, wherein: the measurement control module (3) comprises a pressure test module (301), a switching value test module (302), a pressurization module (303), a quick drainage module (304), a proportional control valve control module (305) and an emergency stop protection module (306); the hydraulic pipeline module (2) inputs signals into the pressure testing module (301) and the switching value testing module (302); the four modules of the pressurization module (303), the quick drainage module (304), the proportional control valve control module (305) and the emergency stop protection module (306) have signal interaction with the hydraulic pipeline module (2).

3. The float-type level switch automatic calibration device of claim 2, wherein: the central processing module comprises a signal acquisition module (4), a driving control module (5) and a data processing module (6); the pressure testing module (301) and the switching value testing module (302) input signals to the signal acquisition module (4); the driving control module (5) inputs signals into the pressurization module (303), the quick drainage module (304) and the proportional control valve control module (305); the emergency stop protection module (306) inputs a signal to the drive control module (5).

4. The float-type level switch automatic calibration device of claim 3, wherein: the signal acquisition module (4) inputs signals to the data processing module (6), and the data processing module (6) and the drive control module (5) are in signal interaction.

5. The float-type level switch automatic calibration device of claim 4, wherein: and the data processing module (6) and the upper computer (7) are in signal interaction.

6. The float-type level switch automatic calibration device of claim 1, wherein: and the container (8) to be tested and the hydraulic pipeline module (2) are in signal interaction.

7. The float-type level switch automatic calibration device of claim 1, wherein: the container (8) to be tested, the hydraulic pipeline module (2) and the pit are connected.

8. The float-type level switch automatic calibration device of claim 2, wherein: the pressure testing module (301) is located at the joint of the container to be tested (8) and the hydraulic pipeline module (2), and the switching value testing module (302) is connected with a liquid level switch in the container to be tested (8).

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