Liquid level gauge calibration device

Abstract

The application relates to the technical field of instrument calibration, and provides a liquid level meter calibration device. The liquid level meter calibration device at least comprises a calibration container, a test container, a float, a detection device, an adjusting device and a control device. The test container is communicated with the calibration container, so that the liquid level height in the calibration container is the same as the liquid level height in the test container, and then the liquid level height in the calibration container can be obtained by measuring the liquid level height in the test container. The float and the detection device are arranged, so that the measurement accuracy is improved. The adjusting device and the control device are arranged, the control device can control the adjusting device to act according to the liquid level height in the test container determined by the detection device, and the liquid level height in the calibration container is adjusted. Therefore, the mutual cooperation among the components improves the calibration accuracy of the liquid level meter.

Description

Technical Field

[0001] This application relates to the field of instrument calibration technology, and in particular to a level gauge calibration device. Background Technology

[0002] The accuracy of level gauge measurements is crucial for the reliable and stable operation of process systems. Taking nuclear power plants as an example, the level gauges used include, but are not limited to, guided wave radar level gauges, MLT100 level gauges, capacitive level gauges, and switch level gauges. However, these various types of level gauges may experience reading drift or other anomalies during long-term use, leading to deviations. Therefore, regular calibration of the level gauges is necessary. During this process, controlling the accuracy of level gauge calibration is challenging.

[0003] The liquid level calibration tank used in the related technology is a self-made liquid level tank, but the problem of low liquid level calibration accuracy still exists. Summary of the Invention

[0004] Therefore, it is necessary to provide a liquid level gauge calibration device to improve the accuracy of liquid level gauge calibration.

[0005] This application provides a liquid level gauge calibration device, including:

[0006] A calibration vessel having a first cavity for containing liquid and mounting a level gauge to be calibrated;

[0007] A test container having a second cavity connected to a first cavity, such that when the first cavity contains liquid, the second cavity has the same liquid level as the first cavity;

[0008] A float is disposed in the second cavity and can float in accordance with the changes in the liquid level in the second cavity;

[0009] A detection device is disposed on the test container; the detection device is used to emit a laser toward the float and receive the laser reflected by the float to determine the liquid level height in the second cavity;

[0010] Adjustment device for injecting and discharging liquid into the first cavity; and

[0011] A control device is provided, which is connected to the detection device and the adjustment device respectively; the control device is used to control the operation of the adjustment device according to the liquid level height in the second cavity determined by the detection device.

[0012] In one embodiment, the float has a reflective surface for reflecting laser light;

[0013] The calibration container has a bottom wall and side walls surrounding the bottom wall, the bottom wall and the side walls forming the first cavity;

[0014] The plane containing the reflective surface is parallel to the plane containing the bottom wall.

[0015] In one embodiment, the adjusting device includes:

[0016] Injection tube, one end of which is connected to the first cavity; and

[0017] An adjustment assembly is provided on the injection tube; the adjustment assembly includes a first sub-adjustment assembly and a second sub-adjustment assembly arranged in parallel.

[0018] The first sub-regulating component is used to respond to the control signal of the control device to open or close the channel through which liquid flows into the first cavity via the injection tube.

[0019] The second sub-regulating component is used to respond to the control signal of the control device to open or close the channel through which liquid flows from the first cavity to the injection tube and out.

[0020] In one embodiment, the first sub-regulating component includes a first solenoid valve.

[0021] In one embodiment, the first sub-regulating component includes a first solenoid valve and a water pump connected in series with the first solenoid valve.

[0022] In one embodiment, the water pump has a first operating speed and a second operating speed;

[0023] When the difference between the measured liquid level and the theoretical liquid level in the second chamber is within a preset range, the water pump responds to the control signal of the control device and runs at the first operating speed.

[0024] When the difference between the measured liquid level and the theoretical liquid level in the second chamber is outside the preset range, the water pump responds to the control signal of the control device and runs at the second operating speed.

[0025] Wherein, the first operating speed is less than the second operating speed.

[0026] In one embodiment, the second sub-regulating component includes a second solenoid valve.

[0027] In one embodiment, the second sub-regulating assembly further includes a third solenoid valve connected in parallel with the second solenoid valve;

[0028] The second solenoid valve is a switching valve, and the third solenoid valve is a flow valve.

[0029] In one embodiment, the second sub-regulation component has a first operating mode and a second operating mode;

[0030] When the difference between the measured liquid level and the theoretical liquid level in the second chamber is within a preset range, the second sub-adjustment component responds to the control signal of the control device and operates in the first operating mode, the second solenoid valve closes, and the third solenoid valve opens.

[0031] When the difference between the measured liquid level and the theoretical liquid level in the second chamber is outside the preset range, the second sub-regulating component responds to the control signal of the control device and operates in the second operating mode, the second solenoid valve opens, and the third solenoid valve closes.

[0032] In one embodiment, the control device includes a control board and a controller;

[0033] The control board is connected to the detection device and the adjustment device respectively, and the controller is connected to the control board;

[0034] The control board is used to feed back the detection signal from the detection device to the controller;

[0035] The controller is used to determine an adjustment signal based on the detection signal, and the control board is also used to control the operation of the adjustment device based on the adjustment signal.

[0036] In one embodiment, the control device further includes an operating device;

[0037] The operating device includes an operating body and a display screen disposed on the operating body;

[0038] The control board and the controller are integrated within the operating body; the display screen is connected to the control board and is used to display the theoretical liquid level and the measured liquid level.

[0039] The measured liquid level height is the liquid level height in the second cavity determined by the detection device.

[0040] In one embodiment, the operating body is provided with a first signal interface and a second signal interface respectively connected to the control board;

[0041] The first signal interface is used to receive current signals, and the second signal interface is used to receive dry contact signals.

[0042] In one embodiment, the level gauge calibration device further includes a base;

[0043] The base is provided with the calibration container and the test container;

[0044] The calibration container is configured to extend and retract in a direction perpendicular to the base, and the test container is detachably connected to the base.

[0045] In one embodiment, the base is provided with a third cavity, and a first opening, a second opening, and a third opening respectively connected to the third cavity;

[0046] The first cavity is connected to the third cavity via the first opening, the second cavity is connected to the third cavity via the second opening, and the regulating device injects and discharges liquid into the first cavity via the third opening.

[0047] In one embodiment, both the first opening and the second opening are located above the third opening.

[0048] In one embodiment, the first opening and the second opening are located at the top of the base, and the third opening is located on one side of the bottom of the base.

[0049] In one embodiment, the plane containing the first opening is a first plane, and the plane containing the second opening is a second plane;

[0050] The first plane and the second plane coincide with each other.

[0051] The aforementioned level gauge calibration device includes at least a calibration container, a test container, a float, a detection device, an adjustment device, and a control device. By setting up a test container connected to the calibration container, the liquid level in the calibration container is made the same as the liquid level in the test container, thus allowing the liquid level in the calibration container to be obtained simply by measuring the liquid level in the test container. The float and detection device improve measurement accuracy. The adjustment and control devices allow the control device to adjust the liquid level in the calibration container based on the liquid level determined by the detection device. Therefore, the coordination between these components improves the accuracy of level gauge calibration.

[0052] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the structure of a level gauge calibration device in one embodiment of this application;

[0054] Figure 2 This is a schematic diagram of the structure of the float in one embodiment of this application;

[0055] Figure 3 This is a schematic diagram of the structure of the operating device in one embodiment of this application;

[0056] Figure 4 This is a schematic diagram of the automatic control process of the level gauge calibration device in one embodiment of this application;

[0057] Figure 5 This is a schematic diagram illustrating the calibration of a digital level gauge in one embodiment of this application.

[0058] Figure 6 This is a schematic diagram illustrating the calibration of an analog liquid level gauge in one embodiment of this application.

[0059] Brief explanation of component symbols:

[0060] The calibration container 100, the first cavity 101, the bottom wall 110, the side wall 120, the first telescopic barrel A1, the second telescopic barrel A2, and the third telescopic barrel A3;

[0061] Test container 200, second cavity 201;

[0062] Float 300, Reflective surface 301;

[0063] Detection device 400;

[0064] Adjustment device 500, injection pipe 510, first sub-adjustment component 521, first solenoid valve 5211, water pump 5212, second sub-adjustment component 522, second solenoid valve 5221, third solenoid valve 5222;

[0065] Control device 600, operating device 610, operating body 611, first signal interface 6111, second signal interface 6112, power supply interface 6113, power button 6114, display screen 612, controller 620;

[0066] Base 700;

[0067] Water storage container 800. Detailed Implementation

[0068] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific implementation methods of the embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the embodiments of this application. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application. The embodiments of this application can be implemented in many ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention. Therefore, the embodiments of this application are not limited to the specific embodiments disclosed below.

[0069] It is understood that the terms "first," "second," etc., used in this application may be used to describe various technical terms, but should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. However, unless otherwise stated, these technical terms are not limited to these terms. These terms are only used to distinguish one technical term from another. For example, without departing from the scope of this application, the first solenoid valve, the second solenoid valve, and the third solenoid valve are different solenoid valves. In the description of embodiments in this application, "a plurality of" or "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0070] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0071] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the horizontal height of the first feature is higher than the horizontal height of the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0072] It should be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0073] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application and in its specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0074] Taking nuclear power plant sites as an example, the level gauges used on nuclear power plant sites include, but are not limited to, guided wave radar level gauges, MLT100 level gauges, capacitive level gauges, and switch level gauges. On the one hand, spare parts replaced on nuclear power plant sites need to be calibrated according to the measurement range to ensure accurate level measurement. On the other hand, equipment used long-term on nuclear power plant sites may experience drift or other anomalies, leading to reduced measurement accuracy, requiring verification of the equipment according to a certain operating cycle. Therefore, the accuracy of level gauge measurement is crucial for the reliable and stable operation of the process system.

[0075] Based on this, the inventors of this application, through in-depth research, have improved the measurement and calibration methods, thereby further improving the calibration accuracy while enhancing the measurement accuracy, and thus improving the calibration accuracy of the level gauge. The following description, in conjunction with some embodiments, provides a detailed explanation of the level gauge calibration device provided in this application.

[0076] Figure 1 A schematic diagram of a liquid level gauge calibration device is shown in one embodiment of this application; for ease of explanation, only the parts related to the embodiment of this application are shown.

[0077] In some embodiments, please refer to Figure 1This application provides a liquid level gauge calibration device, which includes a calibration container 100, a testing container 200, a float 300, a detection device 400, an adjustment device 500, and a control device 600. The calibration container 100 has a first cavity 101 for containing liquid and mounting the liquid level gauge to be calibrated. The testing container 200 has a second cavity 201 connected to the first cavity 101, so that when the first cavity 101 contains liquid, the second cavity 201 has the same liquid level as the first cavity 101. The float 300 is disposed within the second cavity 201 and can float in response to changes in the liquid level within the second cavity 201. A detection device 400 is mounted on the test container 200. The detection device 400 emits a laser beam toward the float 300 and receives the laser beam reflected by the float 300. It can determine the liquid level in the second chamber 201 based on the received laser beam reflected by the float 300. An adjustment device 500 is used to inject and discharge liquid into the first chamber 101. A control device 600 is connected to both the detection device 400 and the adjustment device 500. The control device 600 controls the operation of the adjustment device 500 based on the liquid level in the second chamber 201 determined by the detection device 400.

[0078] It should be noted that calibration container 100 and test container 200 refer to components having cavities capable of containing liquid. Calibration container 100 and test container 200 can be cylindrical or other shapes; this application embodiment does not impose specific limitations on this. Depending on the structural form of calibration container 100 and test container 200, the first cavity 101 and the second cavity 201 can be directly connected or connected via a connector (e.g., a pipe). For example, using... Figure 1 For example, the test container 200 is illustrated as a connecting tube structure, with openings at the bottom and top. The test container 200 can be directly inserted into the first cavity 101 of the calibration container 100, and the second cavity 201 is directly connected to the first cavity 101 via the opening at the bottom of the test container 200. In this case, the detection device 400 can be positioned at the top opening of the test container 200, emitting a laser downwards onto the float 300. Of course, the choice can be made according to actual usage, and this embodiment does not impose specific limitations.

[0079] Therefore, by setting up a test container 200 connected to the calibration container 100, the liquid level in the calibration container 100 is made the same as the liquid level in the test container 200. This allows the liquid level in the calibration container 100 to be obtained simply by measuring the liquid level in the test container 200. The accuracy of the measurement is improved by setting up a float 300 and a detection device 400. By setting up an adjustment device 500 and a control device 600, the control device 600 can control the adjustment device 500 to adjust the liquid level in the calibration container 100 based on the liquid level in the test container 200 determined by the detection device 400. Thus, through the cooperation of these components, the accuracy of the level gauge calibration is improved.

[0080] Figure 2 A schematic diagram of the structure of the float 300 in one embodiment of this application is shown; for ease of explanation, only the parts related to the embodiment of this application are shown.

[0081] To obtain more accurate measurement results, please refer to... Figure 2 and in conjunction with reference Figure 1 In some embodiments, the float 300 has a reflective surface 301 for reflecting laser light. The calibration vessel 100 has a bottom wall 110 and side walls 120 surrounding the bottom wall 110, which together form a first cavity 101. The plane containing the reflective surface 301 is parallel to the plane containing the bottom wall 110. This facilitates measurement by the detection device 400.

[0082] In some specific embodiments, the float 300 can be a lightweight foam block structure, with tin foil on its upper surface to form a reflective surface 301. During the measurement process, when the second cavity 201 is empty, the distance measured by the detection device 400 is the zero distance N. After water is added to the second cavity 201, the float 300 floats, and the actual distance measured by the detection device 400 is M. At this time, the actual liquid level is N minus M. In other specific embodiments, the measuring vessel can be equipped with a liquid level scale, allowing for visual comparison to determine the liquid level.

[0083] For easier adjustment, please continue to refer to [the relevant documentation]. Figure 1In some embodiments, the regulating device 500 includes an injection pipe 510 and a regulating assembly. One end of the injection pipe 510 is connected to the first cavity 101, and the other end of the injection pipe 510 can be connected to the water storage container 800. The regulating assembly is disposed on the injection pipe 510. The regulating assembly includes a first sub-regulating assembly 521 and a second sub-regulating assembly 522 arranged in parallel. The first sub-regulating assembly 521 is used to open or close the channel through which liquid flows into the first cavity 101 via the injection pipe 510 in response to a control signal from the control device 600. The second sub-regulating assembly 522 is used to open or close the channel through which liquid flows out of the first cavity 101 to the injection pipe 510 and out in response to a control signal from the control device 600. Specifically, in some embodiments, to facilitate the injection and discharge of liquid in the first cavity 101 of the calibration container 100, the injection tube 510 can be located at the bottom of the calibration container 100, and the bottom of the calibration container 100 is higher than the height of the water storage container 800. Thus, the process of injecting liquid into the first cavity 101 of the calibration container 100 can be achieved through the first sub-adjustment component 521, and the process of discharging liquid from the first cavity 101 of the calibration container 100 can be achieved through the second sub-adjustment component 522.

[0084] For specific embodiments, please refer to... Figure 1 The first sub-regulating component 521 includes a first solenoid valve 5211; or, the first sub-regulating component 521 includes a first solenoid valve 5211 and a water pump 5212 connected in series with the first solenoid valve 5211. The first solenoid valve 5211 is used to cut off the water supply circuit when the water pump 5212 stops, preventing leakage due to backflow from the water pump 5212. Thus, the process of injecting liquid into the first cavity 101 of the calibration vessel 100 is realized through the first solenoid valve 5211 or the combination of the first solenoid valve 5211 and the water pump 5212. Optionally, the water pump 5212 can be a speed-regulating water pump 5212. Thus, the water pump 5212 can respond to the control signal of the control device 600, and achieve rapid water filling and precise fine-tuning of the liquid level rise by adjusting the speed.

[0085] More specifically, the water pump 5212 has a first operating speed and a second operating speed. When the difference between the measured liquid level and the theoretical liquid level in the second chamber 201 is within a preset range, the water pump 5212 operates at the first operating speed in response to the control signal from the control device 600. When the difference between the measured liquid level and the theoretical liquid level in the second chamber 201 is outside the preset range, the water pump 5212 operates at the second operating speed in response to the control signal from the control device 600. The first operating speed is less than the second operating speed. That is, the selection of the speed-regulating water pump 5212 needs to comprehensively consider the time consumption of the entire calibration process (e.g., controlled between five and ten minutes) and more accurate control of the liquid level during dynamic changes (e.g., liquid level change less than or equal to 1 mm / s). It is understood that the control requirement for the rate of liquid level change is not high when the liquid level changes rapidly. Therefore, the water pump 5212 is configured to have at least two operating speeds (i.e., a first operating speed and a second operating speed). When the difference between the measured liquid level and the theoretical liquid level in the second chamber 201 is within a preset range, the water pump 5212 operates at a slower second operating speed, which can improve the accuracy of liquid level control. When the difference between the measured liquid level and the theoretical liquid level in the second chamber 201 is outside the preset range, the water pump 5212 operates at a faster first operating speed, achieving rapid liquid level control.

[0086] It should be noted that the preset range can be set according to actual usage. In addition, the water pump 5212 can also have more than two operating speeds, which can also be selected and set according to actual conditions. This application embodiment does not impose specific limitations on this.

[0087] For specific embodiments, please refer to... Figure 1 The second sub-regulating assembly 522 includes a second solenoid valve 5221; or, the second sub-regulating assembly 522 includes a second solenoid valve 5221 and a third solenoid valve 5222 connected in parallel with the second solenoid valve 5221. Thus, the liquid discharge process within the first cavity 101 of the calibration vessel 100 can be achieved in an orderly manner through the solenoid valve group. Optionally, the second solenoid valve 5221 is a switching valve, and the third solenoid valve 5222 is a flow valve. Thus, the second solenoid valve 5221 and the third solenoid valve 5222 can respond to the control signal of the control device 600, allowing the second solenoid valve 5221 to be used for rapid water discharge, and the third solenoid valve 5222 to be used for precise control of the liquid level drop.

[0088] More specifically, the second sub-regulating component 522 has a first operating mode and a second operating mode. When the difference between the measured liquid level and the theoretical liquid level in the second chamber 201 is within a preset range, the second sub-regulating component 522 operates in the first operating mode in response to the control signal from the control device 600, with the second solenoid valve 5221 closed and the third solenoid valve 5222 opened. When the difference between the measured liquid level and the theoretical liquid level in the second chamber 201 is outside the preset range, the second sub-regulating component 522 operates in the second operating mode in response to the control signal from the control device 600, with the second solenoid valve 5221 opened and the third solenoid valve 5222 closed. In other words, the selection of the second sub-regulating component 522 needs to comprehensively consider the time consumption of the entire calibration process (e.g., controlled between five and ten minutes) and more accurate control of the liquid level during dynamic changes (e.g., liquid level change less than or equal to 1 mm / s). It is understandable that the control requirement for the rate of liquid level change is not high when the liquid level changes rapidly. Therefore, by configuring the second sub-regulating component 522 to have at least two operating modes (i.e., a first operating mode and a second operating mode), when the difference between the measured liquid level and the theoretical liquid level in the second chamber 201 is within a preset range, the third solenoid valve 5222 can be used to more precisely control the liquid level drop. When the difference between the measured liquid level and the theoretical liquid level in the second chamber 201 is outside the preset range, the second solenoid valve 5221 can be used to quickly release water, achieving rapid liquid level regulation.

[0089] It should be noted that the preset range can be set according to actual usage. Furthermore, the second sub-adjustment component 522 can also have two or more operating modes, which can be selected and set according to actual conditions; this embodiment does not impose specific limitations on this.

[0090] To enable the detection device 400 and the adjustment device 500 to work together, in some embodiments, the control device 600 includes a control board and a controller 620. The control board is connected to both the detection device 400 and the adjustment device 500, and the controller 620 is connected to the control board. The control board is used to feed back the detection signal from the detection device 400 to the controller 620. The controller 620 is used to determine an adjustment signal based on the detection signal, and the control board is also used to control the operation of the adjustment device 500 based on the adjustment signal.

[0091] In some specific embodiments, to facilitate the control board's control of the adjustment device 500, the control element on the control board may include a transistor. In other specific embodiments, to avoid interference with analog and digital circuits, the control signals may employ opto-isolation to prevent interference between signals.

[0092] Figure 3A schematic diagram of the structure of the operating device 610 in one embodiment of this application is shown; for ease of explanation, only the parts related to the embodiment of this application are shown.

[0093] For ease of control, please refer to the following embodiments in some cases. Figure 3 and combined Figure 1 The control device 600 also includes an operating device 610. The operating device 610 includes an operating body 611 and a display screen 612 disposed on the operating body 611. The operating body 611 integrates a control board (not shown) and a controller (not shown). The display screen 612 is connected to the control board and is used to display the theoretical liquid level and the measured liquid level. The measured liquid level is the liquid level in the second cavity 201 determined by the detection device 400.

[0094] To calibrate different level gauges, in some embodiments, the operating body 611 is provided with a first signal interface 6111 and a second signal interface 6112, respectively connected to the control board. The first signal interface 6111 is used to receive current signals, and the second signal interface 6112 is used to receive dry contact signals. That is, the first signal interface 6111 is an analog signal interface, which displays the measured value of the level gauge to be calibrated on the display screen 612. The second signal interface 6112 is a digital signal interface, which mainly receives dry contact signals and displays the digital operation status on the display screen 612. In other embodiments, the operating body 611 is also provided with a power supply interface 6113 and a power button 6114, respectively connected to the control board. This facilitates power supply and power-on / off operation of the operating body 611, making it convenient for the operator.

[0095] Figure 4 This document illustrates a flowchart of the automatic control process of a level gauge calibration device in one embodiment of this application; for ease of explanation, only the parts relevant to the embodiment of this application are shown.

[0096] In some embodiments, please refer to Figure 4 In conjunction with the foregoing embodiments, automatic control of the liquid level in the level gauge calibration device can be achieved. The main control logic is as follows: the operator can set the liquid level setpoint (i.e., the theoretical liquid level height) via the display screen 612. After receiving the measured value (i.e., the measured liquid level height), the control board transmits the detection signal to the controller 620. Upon receiving the setpoint and measured value, the controller 620 compares the setpoint and measured value and performs PID (Proportion Integral Differential) calculations. The regulating device 500 then operates according to the calculation result, thereby controlling the liquid level in the calibration tank. For example, Figure 4 This illustrates the process by which water pump 5212 adjusts according to a signal.

[0097] The following uses digital and analog level gauges as examples, combined with... Figure 5 and Figure 6 The calibration process of the liquid level gauge calibration device provided in the embodiments of this application will be described.

[0098] Figure 5 This diagram illustrates the calibration of a digital level gauge according to one embodiment of this application; for ease of explanation, only the parts relevant to the embodiment of this application are shown.

[0099] Please refer to Figure 5 Where h is the liquid level height, t is the time, h1 is the actual liquid level, s1 is the action value of the switch signal, and s2 is the reset value of the switch signal. The system controls the liquid level in the calibration container 100 to rise or fall, simultaneously acquiring the switch signal from the switch level gauge in real time within the preset rise or fall range displayed on the control screen 612. If the switch level gauge moves upward, the liquid level in the calibration container rises. When the rise action value of the switch level gauge is reached, the switch level gauge node changes, and the actual liquid level value at that time is recorded as the switch level gauge action value. Simultaneously, the liquid level in the calibration container falls, the switch level gauge node resets, and the actual liquid level value at this time is recorded as the switch level gauge reset value. The above calibration process is completed automatically, and the switch level gauge action value and reset value are finally displayed on the display screen 612. It should be noted that the preset rise or fall range is mainly set based on the theoretical action value and reset value of the switch level gauge.

[0100] Figure 6 This diagram illustrates the calibration of an analog liquid level gauge in one embodiment of this application; for ease of explanation, only the parts relevant to the embodiment of this application are shown.

[0101] Please refer to Figure 6 Where h is the liquid level height, t is the time, h1 is the actual liquid level, h2 is the analog liquid level gauge level, and a1, a2, a3, a4, and a5 are five sampling points. Optionally, these five points can be set to 0%, 25%, 50%, 75%, and 100% of the liquid level height, respectively. After setting the range of the analog liquid level gauge on the display screen 612, the liquid level in the calibration container 100 is automatically controlled according to the set range. The liquid level in the calibration tank first rises to a1, a2, a3, a4, and a5, and the liquid level measurement values ​​of the analog liquid level gauge at the above calibration points are collected simultaneously; the liquid level in the calibration tank falls to a5, a4, a3, a2, and a1, and the liquid level measurement values ​​of the analog liquid level gauge at the above calibration points are collected simultaneously. The above calibration process is performed automatically, and the calibration result is displayed on the display screen 612 after calibration.

[0102] The inventors of this application also noted that the liquid level gauge calibration device in the related art is bulky and heavy, and is not easy to operate and carry.

[0103] To address the aforementioned issues of inconvenience in operation and portability, please continue to refer to the following embodiments in some cases. Figure 1 The level gauge calibration device also includes a base 700. A calibration container 100 and a test container 200 are mounted on the base 700. The calibration container 100 is configured to extend and retract in a direction perpendicular to the base 700, and the test container 200 is detachably connected to the base 700. When carried or placed, the calibration container 100 is in a compressed state. When in the calibration state, it is in a stretched state. Thus, when the level gauge calibration device is not needed, the test container 200 and the base 700 can be detached, and the calibration container 100 can be compressed for easy carrying.

[0104] It should be noted that, with Figure 1 For example, the calibration container 100 can be configured as a three-section telescopic structure. When the calibration container 100 is in a compressed state, the three sections of the telescopic structure are compressed together. When the calibration container 100 is in a stretched state, the three sections of the telescopic structure are stretched, with each section stretched, forming a structure as shown in the figure. Figure 1 The calibration container 100 shown is structurally similar. Of course, the calibration container 100 can also be configured as a telescopic structure with two, four, or other numbers of sections, depending on the usage requirements. This application embodiment does not impose specific limitations on this.

[0105] It should also be noted that, with Figure 1 For example, when the calibration container 100 is configured as a telescopic structure, in one embodiment, the calibration container 100 includes a first telescopic barrel A1 disposed on the base 700, a second telescopic barrel A2 connected to the first telescopic barrel A1, and a third telescopic barrel A3 connected to the second telescopic barrel A2. The cross-sectional dimensions of the first telescopic barrel A1, the second telescopic barrel A2, and the third telescopic barrel A3 decrease sequentially. When the calibration container 100 is in a compressed state, the second telescopic barrel A2 is fitted inside the first telescopic barrel A1, and the third telescopic barrel A3 is fitted inside the second telescopic barrel A2. When the calibration container 100 is in a stretched state, the first telescopic barrel A1, the second telescopic barrel A2, and the third telescopic barrel A3 are interlocked. In another embodiment, the calibration container 100 can also be configured as a structure similar to a corrugated pipe to achieve the functions of compression and stretching. It can be configured according to usage requirements, and this application embodiment does not impose specific limitations on this.

[0106] In some embodiments, the base 700 can be made of metal, giving it a certain weight to ensure the stability of the calibration container 100. The upper surface of the calibration container 100 is flat, and it will not deform when subjected to a weight greater than 10 kg. In other specific embodiments, the height of the calibration container 100 after stretching can be set to be greater than 1.8 meters, which can meet the calibration requirements of most nuclear power plant on-site level gauges.

[0107] In other embodiments, a receiving cavity can be provided within the base 700. This cavity can accommodate the signal lines connecting the adjustment device 500 and the detection device 400 to the control device 600, respectively, and a signal interface can be provided on the base 700. Thus, the control device 600 can connect to the adjustment device 500 and the detection device 400 via only this single signal interface. Optionally, the signal lines can be multi-core optical fibers, facilitating integration into a single signal interface for ease of use and operation.

[0108] The inventors discovered through research that, in order to ensure low latency in the response of the calibration vessel 100 and the measuring vessel 200 to changes in liquid level (i.e., they need to change as synchronously as possible), and to eliminate disturbances to the liquid level during water inflow and outflow, the calibration vessel 100 and the measuring vessel 200 can be designed as a shared chamber. For example, in some embodiments, the base 700 has a third cavity, and a first opening, a second opening, and a third opening respectively connected to the third cavity. It is understood that the receiving cavity and the third cavity of the base 700 are independent of each other. The first cavity 101 is connected to the third cavity via the first opening, the second cavity 201 is connected to the third cavity via the second opening, and the adjusting device 500 injects and discharges liquid into the first cavity 101 via the third opening.

[0109] To further reduce the disturbance of the liquid level caused by water inlet and outlet, in some embodiments, both the first and second openings are located above the third opening. More specifically, the first and second openings are located at the top of the base 700, and the third opening is located on one side of the bottom of the base 700.

[0110] To further achieve synchronized changes in the calibration vessel 100 and the measuring vessel 200, in some embodiments, the plane containing the first opening is designated as a first plane, and the plane containing the second opening is designated as a second plane. The first and second planes coincide. Thus, because the first and second openings are coplanar, the impact of water inflow or outflow on liquid level fluctuations can be mitigated, while ensuring that the liquid levels in the calibration vessel 100 and the measuring vessel 200 change synchronously, thereby improving calibration accuracy.

[0111] In summary, the liquid level gauge calibration device provided in this application embodiment connects the measuring vessel and the calibration vessel 100, enabling liquid level measurement in the calibration vessel 100 via the measuring vessel. This facilitates the installation of the liquid level gauge to be calibrated on the calibration vessel 100 and also facilitates operation of the measuring vessel. In the measuring vessel, laser ranging is performed using the detection device 400 to achieve accurate measurement, providing a high-precision standard source so that subsequent calibration processes can be based on more accurate measurement values. By setting the control device 600 and the adjustment device 500, the liquid level in the calibration vessel 100 can be automatically adjusted. Automatic control of the required liquid level can be achieved according to the set value. Simultaneously, by setting the adjustment device 500 as a combination of multiple solenoid valves and a speed-regulating water pump 5212, the liquid level can be controlled to the required value through coarse and fine adjustments. By setting up digital and analog signal acquisition channels on the operating device 610, automatic calibration of different types of level gauges can be achieved, and the calibration results can be displayed intuitively on the display screen 612. In other words, the combination of the connected measuring vessel, calibration vessel 100, control device 600, detection device 400, and adjustment device 500 improves calibration accuracy during the calibration process. Furthermore, by making the calibration vessel 100 a retractable structure, the level gauge calibration device is easy to carry and operate.

[0112] Therefore, the liquid level gauge calibration device provided in this application eliminates tedious manual operations, reduces manpower input, and improves the efficiency of calibration and testing. At the same time, the liquid level gauge calibration device can be automatically controlled. Through the cooperation of the detection device 400, control device 600, and adjustment device 500, the risk of human error is reduced, which helps to improve calibration accuracy and the reliability of important equipment.

[0113] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0114] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A liquid level gauge calibration device, characterized in that, include: The calibration container and the test container are provided. The calibration container has a first cavity for containing liquid and installing a level gauge to be calibrated. The test container has a second cavity that is connected to the first cavity so that when the first cavity contains liquid, the second cavity has the same liquid level as the first cavity. A float is disposed in the second cavity and can float in accordance with the changes in the liquid level in the second cavity; A detection device is disposed on the test container; the detection device is used to emit a laser toward the float and receive the laser reflected by the float to determine the liquid level height in the second cavity; An adjusting device includes an injection tube and an adjusting assembly. One end of the injection tube is connected to the first cavity. The adjusting assembly is disposed on the injection tube and includes a first sub-adjusting assembly and a second sub-adjusting assembly arranged in parallel. The first sub-adjusting assembly is used to open or close the channel through which liquid flows into the first cavity via the injection tube in response to a control signal from a control device. The second sub-adjusting assembly is used to open or close the channel through which liquid flows out of the first cavity to the injection tube and out of the cavity in response to a control signal from the control device. as well as A control device is connected to the detection device and the adjustment device, respectively. The control device is used to control the operation of the adjustment device according to the liquid level height in the second cavity determined by the detection device; The first sub-regulating component includes a first solenoid valve and a water pump connected in series with the first solenoid valve. The first solenoid valve is used to cut off the water supply circuit when the water pump stops, to prevent liquid backflow. When the difference between the measured liquid level and the theoretical liquid level in the second chamber is within a preset range, the water pump operates at a first operating speed in response to the control signal of the control device. When the difference between the measured liquid level and the theoretical liquid level in the second chamber is outside the preset range, the water pump operates at a second operating speed in response to the control signal of the control device. The first operating speed is less than the second operating speed. The second sub-regulating component includes a second solenoid valve and a third solenoid valve connected in parallel with the second solenoid valve. The second solenoid valve is an on / off valve and can be used for rapid water release. The third solenoid valve is a flow valve and can be used for precise control of liquid level drop. The second sub-regulating component has a first operating mode and a second operating mode. When the difference between the measured liquid level and the theoretical liquid level in the second chamber is within a preset range, the second sub-regulating component operates in the first operating mode in response to the control signal of the control device, with the second solenoid valve closed and the third solenoid valve open. When the difference between the measured liquid level and the theoretical liquid level in the second chamber is outside the preset range, the second sub-regulating component operates in the second operating mode in response to the control signal of the control device, with the second solenoid valve open and the third solenoid valve closed.

2. The liquid level gauge calibration device according to claim 1, characterized in that, The floating block has a reflective surface for reflecting laser light; The calibration container has a bottom wall and side walls surrounding the bottom wall, the bottom wall and the side walls forming the first cavity; The plane containing the reflective surface is parallel to the plane containing the bottom wall.

3. The liquid level gauge calibration device according to claim 1 or 2, characterized in that, The control device includes a control board and a controller; The control board is connected to the detection device and the adjustment device respectively, and the controller is connected to the control board; The control board is used to feed back the detection signal from the detection device to the controller; The controller is used to determine an adjustment signal based on the detection signal, and the control board is also used to control the operation of the adjustment device based on the adjustment signal.

4. The liquid level gauge calibration device according to claim 3, characterized in that, The control device also includes an operating device; The operating device includes an operating body and a display screen disposed on the operating body; The control board and the controller are integrated within the operating body; the display screen is connected to the control board and is used to display the theoretical liquid level and the measured liquid level. The measured liquid level height is the liquid level height in the second cavity determined by the detection device.

5. The liquid level gauge calibration device according to claim 4, characterized in that, The operating body is provided with a first signal interface and a second signal interface that are respectively connected to the control board; The first signal interface is used to receive current signals, and the second signal interface is used to receive dry contact signals.

6. The liquid level gauge calibration device according to claim 1 or 2, characterized in that, The level gauge calibration device also includes a base; The base is provided with the calibration container and the test container; The calibration container is configured to extend and retract in a direction perpendicular to the base, and the test container is detachably connected to the base.

7. The liquid level gauge calibration device according to claim 6, characterized in that, The base has a third cavity, and a first opening, a second opening, and a third opening that are respectively connected to the third cavity; The first cavity is connected to the third cavity via the first opening, the second cavity is connected to the third cavity via the second opening, and the regulating device injects and discharges liquid into the first cavity via the third opening.

8. The liquid level gauge calibration device according to claim 7, characterized in that, Both the first opening and the second opening are located above the third opening.

9. The liquid level gauge calibration device according to claim 8, characterized in that, The first opening and the second opening are located at the top of the base, and the third opening is located on one side of the bottom of the base.

10. The liquid level gauge calibration device according to claim 9, characterized in that, The plane containing the first opening is the first plane, and the plane containing the second opening is the second plane; The first plane and the second plane coincide with each other.

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