WO2023231275A1

WO2023231275A1 - Level gauge calibration device

Info

Publication number: WO2023231275A1
Application number: PCT/CN2022/126299
Authority: WO
Inventors: 陈永伟; 刘润峰; 周新星
Original assignee: 中广核核电运营有限公司; 中国广核集团有限公司; 中国广核电力股份有限公司
Priority date: 2022-05-31
Filing date: 2022-10-20
Publication date: 2023-12-07
Also published as: CN114964434A

Abstract

The present application relates to the technical field of instrument verification. Provided in the embodiments of the present application is a level gauge calibration device. The level gauge calibration device comprises at least a calibration container (100), a test container (200), a floating block (300), a measurement device (400), an adjustment device (500) and a control device (600). By providing a test container (200) that is in communication with a calibration container (100), the height of the liquid level in the calibration container (100) is the same as the height of the liquid level in the test container (200), so that the height of the liquid level in the calibration container (100) can be obtained simply by measuring the height of the liquid level in the test container (200). By providing the floating block (300) and the measurement device (400), the measurement accuracy can be improved. By providing the adjustment device (500) and the control device (600), the control device (600) can control the adjustment device (500) to act according to the height of the liquid level in the test container (200) determined by the measurement device (400), so as to adjust the height of the liquid level in the calibration container (100). Therefore, through the mutual cooperation of the components, the calibration accuracy of a level gauge is improved.

Description

Liquid level gauge calibration device

cross reference

This application refers to Chinese Patent Application No. 202210604981.5 titled "Liquid Level Gauge Calibration Device" submitted on May 31, 2022, which is fully incorporated into this application by reference.

Technical field

The present application relates to the technical field of instrument calibration, and in particular to a liquid level meter calibration device.

Background technique

The accuracy of liquid level gauge measurement is important for the reliable and stable operation of process systems. Taking the nuclear power site as an example, the liquid level gauges used at the nuclear power site include but are not limited to guided wave radar level gauges, MLT100 liquid level gauges, capacitive liquid level gauges and switching level gauges. The above-mentioned various types of liquid level gauges may have drift and other abnormalities in their readings during long-term use, so the liquid level gauges need to be calibrated regularly. During this process, the accuracy of the liquid level gauge calibration is difficult to control.

The liquid level calibration barrel used in the related art is a self-made liquid level barrel, but there is still a problem of low liquid level calibration accuracy.

Contents of the invention

According to various embodiments of the present application, a liquid level gauge calibration device is provided.

The embodiment of the present application provides a liquid level meter calibration device, including: a calibration container, the calibration container has a first cavity, the first cavity is used to accommodate liquid and install the liquid level meter to be calibrated; a test container , the test container has a second cavity, and the second cavity is connected with the first cavity, so that when the first cavity contains liquid, the second cavity has the same liquid level as the first cavity; The floating block is arranged in the second cavity and can float following the change of the liquid level in the second cavity; the detection device is arranged on the test container; the detection device is used to emit laser towards the floating block and receive the reflection of the floating block a laser to determine the liquid level height in the second cavity; an adjustment device for injecting and discharging liquid into the first cavity; and a control device, the control device is connected to the detection device and the adjustment device respectively; the control device is used to control the detection device according to the detection device The determined liquid level height in the second cavity controls the action of the regulating device.

In the above liquid level gauge calibration device, the liquid level gauge calibration device at least includes a calibration container, a test container, a floating block, a detection device, an adjustment device and a control device. By setting up a test container connected to the calibration container, the liquid level height in the calibration container is the same as the liquid level height in the test container, so that only by measuring the liquid level height in the test container, Obtain the liquid level height in the calibration container. By setting up floating blocks and detection devices, the accuracy of measurement can be improved. By arranging the adjustment device and the control device, the control device can control the action of the adjustment device to adjust the liquid level height in the calibration container according to the liquid level height in the test container determined by the detection device. As a result, the accuracy of the calibration of the liquid level gauge is improved through the cooperation between the above components.

In one embodiment, 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, and the bottom wall and side walls form a first cavity; wherein, the reflective surface The plane on which it lies and the plane on which the bottom wall lies are parallel to each other. In this way, it is convenient for the detection device to perform measurements.

In one of the embodiments, the adjustment device includes: a liquid injection pipe, the nozzle at one end of the liquid injection pipe is connected with the first cavity; and an adjustment component, which is provided on the liquid injection pipe; the adjustment component includes a first pipe arranged in parallel. Sub-regulatory component and second sub-regulatory component; wherein, the first sub-regulatory component is used to respond to the control signal of the control device to open or block the passage of liquid into the first cavity through the liquid injection pipe; the second sub-regulatory component It is used to open or block the passage of liquid flowing out from the first cavity to the liquid injection pipe in response to the control signal of the control device. In this way, it is convenient for the detection device to adjust.

In one embodiment, the first sub-regulator assembly includes a first solenoid valve.

In this way, the process of injecting liquid into the first cavity of the calibration container is realized through the first solenoid valve.

In one embodiment, the first sub-regulation assembly further includes a first solenoid valve and a water pump connected in series with the first solenoid valve.

In this way, through the combination of the first solenoid valve and the water pump, the process of injecting liquid into the first cavity of the calibration container is realized.

In one embodiment, the water pump 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 is within a preset range, the water pump responds to the control of the control device The signal runs at the first operating speed; when the difference between the measured liquid level height and the theoretical liquid level height in the second cavity is outside the preset range, the water pump operates at the second operating speed in response to the control signal of the control device; wherein, the first The first operating speed is smaller than the second operating speed.

Therefore, since the water pump has two operating speeds (i.e., the first operating speed and the second operating speed), when the difference between the measured liquid level height and the theoretical liquid level height in the second cavity is within the preset range, the water pump moves at a relatively high speed. Running at a slow second operating speed can improve the accuracy of liquid level control. When the difference between the measured liquid level height and the theoretical liquid level height in the second cavity is outside the preset range, the water pump runs at a faster first operating speed to achieve rapid regulation of the liquid level.

In one embodiment, the second sub-regulator assembly includes a second solenoid valve.

In this way, the discharge process of the liquid in the first cavity of the calibration container can be realized through the solenoid valve.

In one embodiment, the second sub-regulating component further includes a third solenoid valve connected in parallel with the second solenoid valve; wherein the second solenoid valve is a switch valve and the third solenoid valve is a flow valve.

In this way, the discharge process of the liquid in the first cavity of the calibration container can be realized in an orderly manner through the solenoid valve group.

In one embodiment, the second sub-adjustment component has a first operating mode and a second operating mode; when the difference between the measured liquid level height and the theoretical liquid level height in the second chamber is within a preset range, the second sub-regulating assembly The adjustment component operates in the first operating mode in response to the control signal of the control device, the second solenoid valve is closed, and the third solenoid valve is opened; when the difference between the measured liquid level height and the theoretical liquid level height in the second cavity is outside the preset range When, the second sub-regulating component operates in the second operating mode in response to the control signal of the control device, the second solenoid valve is opened, and the third solenoid valve is closed.

Therefore, since the second sub-adjustment component is configured to have two operating modes (i.e., the first operating mode and the second operating mode), when the difference between the measured liquid level height and the theoretical liquid level height in the second chamber is within the preset range , a third solenoid valve can be used to more accurately control the liquid level drop. When the difference between the measured liquid level height and the theoretical liquid level height in the second cavity is outside the preset range, the second solenoid valve can be used to quickly release water to achieve rapid control of the liquid level.

In one embodiment, 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; wherein, the control board is used to feed back the detection signal of the detection device to the controller; control The controller is used to determine the adjustment signal based on the detection signal, and the control board is also used to control the action of the adjustment device based on the adjustment signal.

In this way, the working process of the detection device and the adjustment device cooperating with each other can be realized.

In one embodiment, the control device also includes an operating device; the operating device includes an operating body and a display screen provided on the operating body; a control panel and a controller are integrated into the operating body; the display screen is connected to the control panel and is used to display the theoretical liquid surface height and measured liquid level height; wherein, the measured liquid level height is the liquid level height in the second cavity determined by the detection device. This makes it easier to control.

In one embodiment, the operating body is provided with a first signal interface and a second signal interface 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.

In this way, calibration of different liquid level gauges can be achieved.

In one embodiment, the liquid level gauge calibration device further includes a base; a calibration container and a test container are provided on the base; the calibration container is configured to be telescopic in a direction perpendicular to the base, and the test container and the base are detachable connect.

When carried or placed, the calibration container is in a compressed state. When in the calibration state, it is in the stretched state. In this way, when the liquid level meter calibration device is not needed, the test container and the base can be disassembled, and the calibration container can be compressed for easy portability.

In one embodiment, a third cavity is provided in the base, and a first opening, a second opening, and a third opening are respectively connected with the third cavity; wherein the first cavity communicates with the third cavity by means of the first opening. The third cavity is connected to each other, the second cavity is connected to the third cavity through the second opening, and the adjusting device injects and discharges liquid into the first cavity through the third opening.

In this way, it is possible to ensure a low delay in the response of the calibration vessel 100 and the measurement vessel 200 when the liquid level changes, and to eliminate the disturbance to the liquid level during water inflow and drainage.

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

In this way, the disturbance of the liquid level caused by water inflow and drainage can be further reduced.

In one embodiment, the first opening and the second opening are provided on the top of the base, and the third opening is provided on one side of the bottom of the base.

In this way, through the arrangement of the first opening, the second opening and the third opening, the disturbance of the liquid level caused by water inflow and drainage is further reduced.

In one embodiment, the plane where the first opening is located is a first plane, and the plane where the second opening is located is a second plane; the first plane and the second plane coincide with each other.

In this way, since the first opening and the second opening are coplanar, the impact on liquid level fluctuations during water inflow or drainage can be alleviated, while ensuring that the liquid levels of the calibration container and the measurement container change synchronously, thus improving the accuracy of calibration. sex.

The above description is only an overview of the technical solutions of the present application. In order to have a clearer understanding of the technical means of the present application, they can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable. , the specific implementation methods of the present application are specifically listed below.

Description of the drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the embodiments. The drawings are only for the purpose of illustrating the embodiments and are not to be considered as limitations of the application. Also, the same parts are represented by the same reference numerals throughout the drawings. In the attached picture:

Figure 1 is a schematic structural diagram of a liquid level meter calibration device in an implementation of the embodiment of the present application;

Figure 2 is a schematic structural diagram of a floating block in an implementation of the embodiment of the present application;

Figure 3 is a schematic structural diagram of an operating device in an implementation of the embodiment of the present application;

Figure 4 is a schematic flow chart of the automatic control of the liquid level gauge calibration device in one implementation of the embodiment of the present application;

Figure 5 is a schematic diagram of the calibration of a switching liquid level meter in one implementation of the embodiment of the present application;

Figure 6 is a schematic diagram of the calibration of an analog liquid level meter in an implementation of the embodiment of the present application.

The reference numbers in the specific implementation are as follows:

Calibration container 100, first cavity 101, bottom wall 110, side wall 120, first telescopic barrel A1, second telescopic barrel A2, third telescopic barrel A3;

Test container 200, second cavity 201;

Floating block 300, reflective surface 301;

Detection device 400;

Adjustment device 500, liquid 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;

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;

Base 700;

Water storage container 800.

Detailed ways

In order to make the above objects, features and advantages of the present application more obvious and easy to understand, the specific implementation manners of the embodiments of the present application will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the embodiments of the present application. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application. The embodiments of the present application can be implemented in many other ways different from those described here. Those skilled in the art can make similar improvements without violating the connotation of the embodiments of the present application. Therefore, the embodiments of the present application are not subject to the specific disclosures below. Limitations of Examples.

It can be understood that the terms "first", "second", etc. used in this application may be used to describe various professional terms in this article, but cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. quantity. However, unless otherwise stated, these professional terms are not limited by these terms. These terms are used only to distinguish one technical term from another. For example, without departing from the scope of the present application, the first solenoid valve, the second solenoid valve and the third solenoid valve are different solenoid valves. In the description of the embodiments of this application, "plurality" and "several" mean at least two, such as two, three, etc., unless otherwise explicitly and specifically limited.

In the description of the embodiments of the present application, unless otherwise explicitly stipulated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a fixed connection. It can be detachably connected or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements. Unless otherwise expressly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

In the description of the embodiments of the present application, unless otherwise expressly provided and limited, a first feature "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in direct contact. Indirect contact through intermediaries. Furthermore, the terms "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the level of the first feature is higher than the level of the second feature. . "Below", "below" and "below" the first feature of the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a horizontal height that is less than the second feature.

It should be noted that when an element is referred to as being "mounted" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may also be intervening elements present.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by a person skilled in the technical field of this application. The terms used in the description of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

Taking the nuclear power site as an example, the liquid level gauges used at the nuclear power site include but are not limited to guided wave radar level gauges, MLT100 liquid level gauges, capacitive liquid level gauges and switching level gauges. On the one hand, spare parts replaced in nuclear power sites need to be calibrated according to the measurement range to ensure accurate measurement of liquid level. On the other hand, equipment used for a long time at nuclear power sites may have drift and other anomalies, resulting in reduced measurement accuracy, and the equipment needs to be verified based on a certain operating cycle. Therefore, the accuracy of liquid level meter measurement is very important for the reliable and stable operation of the process system.

Based on this, the inventor of the present application has conducted in-depth research and improved the measurement method and calibration method to further improve the calibration accuracy on the basis of improving the measurement accuracy, thereby improving the accuracy of the liquid level meter calibration. The liquid level gauge calibration device provided by the embodiments of the present application will be described below in conjunction with the relevant descriptions of some embodiments.

Figure 1 shows a schematic structural diagram of a liquid level gauge calibration device in an implementation of the embodiment of the present application; for convenience of explanation, only the parts related to the embodiment of the present application are shown.

In some embodiments, please refer to Figure 1. This embodiment of the present application provides a liquid level gauge calibration device. The liquid level gauge calibration device includes a calibration container 100, a test container 200, a floating block 300, a detection device 400, Adjustment device 500 and control device 600 . The calibration container 100 has a first cavity 101. The first cavity 101 is used to accommodate liquid and install a liquid level meter to be calibrated. The test container 200 has a second cavity 201, and the second cavity 201 is connected with the first cavity 101, so that when the first cavity 101 contains liquid, the second cavity 201 has a connection with the first cavity 101. Same liquid level. The floating block 300 is disposed in the second cavity 201 and can float following changes in the liquid level in the second cavity 201 . The detection device 400 is installed on the test container 200. The detection device 400 is used to emit laser toward the floating block 300 and receive the laser reflected by the floating block 300, and can determine the laser in the second cavity 201 based on the received laser reflected by the floating block 300. Liquid level height. The adjusting device 500 is used to inject and discharge liquid into the first cavity 101 . The control device 600 is connected to the detection device 400 and the adjustment device 500 respectively. The control device 600 is used to control the action of the adjustment device 500 according to the liquid level height in the second cavity 201 determined by the detection device 400 .

It should be noted that the calibration container 100 and the test container 200 refer to components having a cavity that can accommodate liquid. The calibration container 100 and the test container 200 may have a cylindrical structure or other shapes, which are not specifically limited in the embodiments of the present application. According to the structural forms of the calibration container 100 and the test container 200, the first cavity 101 and the second cavity 201 may be directly connected or connected through a connecting member (such as a pipe, etc.). For example, taking FIG. 1 as an example, it is shown that the test container 200 is a structure in the form of a connecting tube. The test container 200 has openings located at the bottom and the top respectively. The test container 200 can be directly plugged into the first cavity 101 of the calibration container 100 , and the second cavity 201 is directly connected to the first cavity 101 through the opening at the bottom of the test container 200 . At this time, the detection device 400 can be disposed at the opening at the top of the test container 200 and emit the laser downward to the floating block 300 . Of course, the selection can be made according to actual usage conditions, and the embodiments of the present application do not specifically limit this.

Therefore, by arranging the test container 200 connected with the calibration container 100, the liquid level height in the calibration container 100 is the same as the liquid level height in the test container 200, so that only the test container 200 needs to be measured. The liquid level height in the calibration container 100 can be obtained. By arranging the floating block 300 and the detection device 400, the accuracy of measurement can be improved. By providing the adjustment device 500 and the control device 600 , the control device 600 can control the action of the adjustment device 500 to adjust the liquid level in the calibration container 100 based on the liquid level height in the test container 200 determined by the detection device 400 . As a result, the accuracy of the calibration of the liquid level gauge is improved through the cooperation between the above components.

Figure 2 shows a schematic structural diagram of the floating block 300 in an implementation of the embodiment of the present application; for convenience of explanation, only the parts related to the embodiment of the present application are shown.

In order to obtain a more accurate measurement effect, please refer to Figure 2 in conjunction with Figure 1. In some embodiments, the floating block 300 has a reflective surface 301 for reflecting laser light. The calibration container 100 has a bottom wall 110 and side walls 120 surrounding the bottom wall 110 . The bottom wall 110 and the side walls 120 form a first cavity 101 . The plane where the reflective surface 301 is located and the plane where the bottom wall 110 is located are parallel to each other. In this way, it is convenient for the detection device 400 to perform measurements.

Specifically, in some embodiments, the floating block 300 may be a lightweight foam block structure, and a tin foil is provided on the upper surface of the floating block 300 to form a reflective surface 301 . During the measurement process, when there is no water in the second cavity 201, the distance measured by the detection device 400 is the zero distance N. After the water is filled in the second cavity 201, the floating block 300 floats up, and the actual distance is measured as M by the detection device 400. At this time, the actual liquid level is the value of N minus M. Specifically, in other embodiments, the measuring container may be provided with a liquid level scale, and the liquid level may be judged through visual comparison.

For easier adjustment, please continue to refer to FIG. 1 . In some embodiments, the adjustment device 500 includes a liquid injection tube 510 and an adjustment assembly. The nozzle at one end of the liquid injection pipe 510 is connected to the first cavity 101 , and the nozzle at the other end of the liquid injection pipe 510 can be connected to the water storage container 800 . The adjusting component is located on the liquid injection pipe 510 . The adjustment assembly includes a first sub-adjustment assembly 521 and a second sub-adjustment assembly 522 arranged in parallel. The first sub-adjustment component 521 is used to respond to the control signal of the control device 600 to open or block the passage of liquid into the first cavity 101 through the liquid injection pipe 510 . The second sub-adjustment component 522 is used to respond to the control signal of the control device 600 to open or block the passage of liquid flowing out from the first cavity 101 to the liquid injection pipe 510 and outflow. Specifically, in some embodiments, in order to facilitate the injection and discharge of the liquid in the first cavity 101 of the calibration container 100, the liquid injection pipe 510 can be provided at the bottom of the calibration container 100. The bottom height of the calibration container 100 is high. at the height of the water storage container 800. In this way, the process of injecting liquid into the first cavity 101 of the calibration container 100 can be realized through the first sub-adjustment component 521, and the process of injecting the liquid into the first cavity 101 of the calibration container 100 can be realized through the second sub-adjustment assembly 522. discharge process.

Specifically, in some embodiments, please continue to refer to FIG. 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 connected in series with the first solenoid valve 5211. 5212. The first solenoid valve 5211 is used to cut off the water supply circuit when the water pump 5212 stops, to prevent backflow leakage of the water pump 5212. In this way, through the first solenoid valve 5211 or the combination of the first solenoid valve 5211 and the water pump 5212, the process of injecting liquid into the first cavity 101 of the calibration container 100 is realized. Optionally, the water pump 5212 can be a speed-regulating water pump 5212. In this way, the water pump 5212 can respond to the control signal of the control device 600 by adjusting the speed to achieve rapid water supply and precise fine-tuning of the liquid level rise.

More specifically, water pump 5212 has a first operating speed and a second operating speed. When the difference between the measured liquid level height and the theoretical liquid level height in the second cavity 201 is within the preset range, the water pump 5212 operates at the first operating speed in response to the control signal of the control device 600 . When the difference between the measured liquid level height and the theoretical liquid level height in the second cavity 201 is outside the preset range, the water pump 5212 operates at the second operating speed in response to the control signal of the control device 600 . Wherein, the first operating speed is smaller than the second operating speed. That is to say, the selection of the speed-regulating water pump 5212 needs to comprehensively consider the time consumption of the entire calibration process (for example, control between about five minutes and about ten minutes) and the more accurate control of the liquid level during the dynamic change of the liquid level ( For example, the liquid level changes by less than or equal to about 1 millimeter (mm)/second (s)). It is understandable that when the liquid level changes rapidly, the control of the liquid level change rate is not very demanding. Thus, by configuring the water pump 5212 to have at least two operating speeds (ie, a first operating speed and a second operating speed). When the difference between the measured liquid level height and the theoretical liquid level height in the second cavity 201 is within the preset range, the water pump 5212 runs at a slower second operating speed, which can improve the accuracy of liquid level control. When the difference between the measured liquid level height and the theoretical liquid level height in the second cavity 201 is outside the preset range, the water pump 5212 runs at a faster first operating speed to achieve rapid regulation of the liquid level.

It should be noted that the preset range can be set according to actual usage conditions. In addition, the water pump 5212 can also have more than two operating speeds, and can also be selected and set according to actual conditions. This embodiment of the present application does not specifically limit this.

Specifically, in some embodiments, please continue to refer to FIG. 1 , the second sub-adjustment component 522 includes a second solenoid valve 5221; or, the second sub-adjustment component 522 includes a second solenoid valve 5221 and is connected in parallel with the second solenoid valve 5221. The third solenoid valve 5222. In this way, the discharge process of the liquid in the first cavity 101 of the calibration container 100 can be realized in an orderly manner through the solenoid valve group. Optionally, the second solenoid valve 5221 is a switch valve, and the third solenoid valve 5222 is a flow valve. In this way, the second solenoid valve 5221 and the third solenoid valve 5222 can respond to the control signal of the control device 600, so that the second solenoid valve 5221 can be used to quickly discharge water, and the third solenoid valve 5222 can be used to accurately control the liquid level drop.

More specifically, the second sub-regulation assembly 522 has a first operating mode and a second operating mode. When the difference between the measured liquid level height and the theoretical liquid level height in the second cavity 201 is within the preset range, the second sub-adjustment component 522 operates in the first operating mode in response to the control signal of the control device 600, and the second electromagnetic The valve 5221 is closed, and the third solenoid valve 5222 is opened. When the difference between the measured liquid level height and the theoretical liquid level height in the second cavity 201 is outside the preset range, the second sub-adjustment component 522 operates in the second operating mode in response to the control signal of the control device 600, and the second electromagnetic The valve 5221 is opened, and the third solenoid valve 5222 is closed. That is to say, the selection of the second sub-adjustment component 522 needs to comprehensively consider the time consumption of the entire calibration process (for example, control between five minutes and ten minutes) and the more accurate control of the liquid level during the dynamic change process of the liquid level ( For example, the liquid level changes by less than or equal to about 1 millimeter (mm)/second (s)). It is understandable that when the liquid level changes rapidly, the control of the liquid level change rate is not very demanding. Thereby, the second sub-regulation assembly 522 is configured to have at least two operating modes (ie, a first operating mode and a second operating mode). When the difference between the measured liquid level height and the theoretical liquid level height in the second chamber 201 is within the preset range, the third solenoid valve 5222 can be used to control the liquid level drop more accurately. When the difference between the measured liquid level height and the theoretical liquid level height in the second cavity 201 is outside the preset range, the second solenoid valve 5221 can be used to quickly discharge water to achieve rapid control of the liquid level.

It should be noted that the preset range can be set according to actual usage conditions. In addition, the second sub-adjustment component 522 can also have two or more operating modes, which can also be selected and set according to actual conditions. This embodiment of the present application does not specifically limit this.

In order to realize the cooperative working process of the detection device 400 and the adjustment device 500, in some embodiments, the control device 600 includes a control panel and a controller 620. The control board is connected to the detection device 400 and the adjustment device 500 respectively, and the controller 620 is connected to the control board. The control board is used to feed back the detection signal of the detection device 400 to the controller 620 . The controller 620 is used to determine the adjustment signal according to the detection signal, and the control board is also used to control the action of the adjustment device 500 according to the adjustment signal.

Specifically, in some embodiments, in order to facilitate the control board to control the action of the adjustment device 500, the control element on the control board may include a triode. Specifically in other embodiments, in order to avoid interference to analog and digital circuits, the control signal may be optically isolated to avoid interference between signals.

Figure 3 shows a schematic structural diagram of the operating device 610 in an implementation of the embodiment of the present application; for convenience of explanation, only the parts related to the embodiment of the present application are shown.

In order to facilitate control, in some embodiments, please refer to FIG. 3 in conjunction with FIG. 1 , the control device 600 further includes an operating device 610 . The operating device 610 includes an operating body 611 and a display screen 612 provided on the operating body 611 . The operating body 611 is integrated with a control panel (not shown) and a controller (not shown). The display screen 612 is connected to the control panel and is used to display the theoretical liquid level height and the measured liquid level height. The measured liquid level height is the liquid level height in the second cavity 201 determined by the detection device 400 .

In order to achieve calibration of different liquid level gauges, in some embodiments, the operating body 611 is provided with a first signal interface 6111 and a second signal interface 6112 that are 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 to say, the first signal interface 6111 is an analog signal interface, and displays the measurement value of the liquid level meter to be calibrated on the display screen 612 . The second signal interface 6112 is a switch signal interface, which mainly receives dry contact signals and displays the switch action 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-on key 6114 that are respectively connected to the control board. In this way, it is convenient to provide power to the operating body 611 and turn it on and off. Convenient for operators to use.

Figure 4 shows a schematic flowchart of the automatic control of the liquid level gauge calibration device in an implementation of the embodiment of the present application; for ease of explanation, only the parts related to the embodiment of the present application are shown.

In some embodiments, please refer to FIG. 4 in conjunction with some of the foregoing embodiments, the liquid level of the liquid level meter calibration device can be automatically controlled. The main control logic is: the operator can set the liquid level setting value (ie, the theoretical liquid level height) through the display screen 612, and the control panel receives the measured value (ie, the measured liquid level height). The detection signal is transmitted to the controller 620. After receiving the set value and the measured value, the controller 620 compares the set value with the measured value and then performs a PID (Proportion Integral Differential) calculation. The adjusting device 500 acts according to the calculation result to achieve calibration of the barrel liquid. bit control. For example, Figure 4 illustrates the process of the water pump 5212 adjusting according to the signal.

Taking the switching liquid level gauge and the analog liquid level gauge as examples, the calibration process of the liquid level gauge calibration device provided by the embodiment of the present application will be described below in conjunction with Figures 5 and 6 .

FIG. 5 shows a schematic diagram of the calibration of a switching liquid level meter in an implementation of the embodiment of the present application; for convenience of explanation, only the parts related to the embodiment of the present application are shown.

Please refer to Figure 5. h is the liquid level height, t is the time, h1 is the actual liquid level, s1 is the action value of the switching signal, and s2 is the reset value of the switching signal. The liquid level of the calibration container 100 is controlled to rise or fall, and the preset rising or falling interval on the display screen 612 is controlled while the switching signal of the switching liquid level meter is collected in real time. If the switching liquid level meter is in rising action, the liquid level in the calibration barrel is controlled to rise. When the rising action value of the switching liquid level meter is reached, the node of the switching liquid level meter changes, and the actual liquid level value recorded at that time is the switching liquid level. Bit counter action value. At the same time, the liquid level in the calibration barrel is controlled to drop, and the switch level gauge node is reset. The actual liquid level value recorded at this time is the reset value of the switch level gauge. The above calibration process is completed automatically, and the action value and reset value of the switching level gauge are finally displayed on the display screen 612. It should be noted that the preset rising or falling interval is mainly set based on the theoretical action value and reset value of the switching level meter.

FIG. 6 shows a schematic diagram of the calibration of an analog liquid level meter in an implementation of the embodiment of the present application; for convenience of explanation, only the parts related to the embodiment of the present application are shown.

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

The inventor of the present application also noticed that the liquid level gauge calibration device in the related art is bulky and heavy, and is not easy to operate and carry.

In order to solve the above problems of inconvenient operation and portability, in some embodiments, please continue to refer to FIG. 1 , the liquid level gauge calibration device also includes a base 700 . The base 700 is provided with a calibration container 100 and a test container 200. The calibration container 100 is configured to be telescopic 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 the stretched state. In this way, when the liquid level gauge calibration device is not needed, the test container 200 and the base 700 can be disassembled, and the calibration container 100 can be compressed for portability.

It should be noted that, taking Figure 1 as an example, the calibration container 100 can be configured as a three-section telescopic structure. When the calibration container 200 is in a compressed state, the three-section telescopic structure is compressed together. When the calibration container 300 is in a stretched state, the three-section telescopic structure is stretched, and each section of the telescopic structure is stretched, forming the structure of the calibration container 200 as shown in FIG. 1 . Of course, the calibration container 100 can also be configured as a telescopic structure with two sections, four sections, or other number of sections, and can be set according to usage requirements. The embodiments of the present application do not specifically limit this.

It should also be noted that, taking FIG. 1 as an example, when the calibration container 100 is configured as a telescopic structure, as an implementation manner, the calibration container 100 includes a first telescopic bucket A1 disposed on the base 700 and a first telescopic bucket A1 . The second telescopic barrel A2 connected to A1 and the 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 in sequence. When the calibration container 100 is in a compressed state, the second telescopic barrel A2 is set in the first telescopic barrel A1, and the third telescopic barrel A3 is set in 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 locked with each other. As another implementation manner, the calibration container 100 can also be configured as a bellows-shaped structure to achieve compression and stretching functions. It can be set according to usage requirements, and the embodiments of this application do not impose specific restrictions on this.

In some embodiments, the base 700 can be configured as a metal structure, so that the base 700 has a certain weight to ensure the stability of the calibration container 100 . The upper surface of the calibration container 100 is flat, and when it bears a weight of more than 10 kilograms, the calibration container 100 does not deform. Specifically, in other embodiments, the stretched height of the calibration container 100 can be set to greater than 1.8 meters, which can meet the calibration requirements of most nuclear power on-site liquid level gauges.

In other embodiments, a receiving cavity may be provided in the base 700 . The receiving cavity may be used to accommodate the signal lines connecting the adjusting device 500 and the detecting device 400 to the control device 600 respectively, and a signal may be provided on the base 700 . interface. In this way, the control device 600 can only use the signal connection with the adjustment device 500 and the detection device 400 through this signal interface. Optionally, the signal line can use a multi-core optical fiber structure, so that it can be easily integrated into a signal interface for convenient use and operation.

The inventor found through research that in order to ensure a low delay in the response of the calibration vessel 100 and the measurement vessel 200 when the liquid level changes (that is, the two need to change as synchronously as possible), and to eliminate the impact of the liquid level during water inlet and drainage. Due to the disturbance caused by the position, the calibration container 100 and the measurement container 200 can be designed as a common chamber. For example, in some embodiments, the base 700 is provided with a third cavity, and a first opening, a second opening, and a third opening respectively connected with the third cavity. It can be understood that the receiving cavity and the third cavity of the base 700 are independent of each other. Among them, the first cavity 101 is connected to the third cavity through the first opening, the second cavity 201 is connected to the third cavity through the second opening, and the adjusting device 500 is connected to the first cavity through the third opening. Liquid is injected and discharged into the body 101.

In order to further reduce the disturbance of the liquid level caused by water inflow and drainage, in some embodiments, both the first opening and the second opening are located above the third opening. More specifically, the first opening and the second opening are provided on the top of the base 700 , and the third opening is provided on one side of the bottom of the base 700 .

In order to further realize the synchronous change of the calibration container 100 and the measurement container 200, in some embodiments, the plane where the first opening is located is the first plane, and the plane where the second opening is located is the second plane. The first plane and the second plane coincide with each other. In this way, since the first opening and the second opening are coplanar, the impact on liquid level fluctuations during water inflow or drainage can be alleviated, while ensuring that the liquid levels of the calibration container 100 and the measurement container 200 change synchronously, thereby improving the calibration efficiency. accuracy.

To sum up, in the liquid level meter calibration device provided by the embodiment of the present application, the measurement container is connected with the calibration container 100, and the liquid level measurement of the calibration container 100 is realized with the help of the measurement container, which facilitates calibration. The liquid level gauge that needs to be calibrated is installed on the container 100, which also facilitates the operation of the measuring container. In the measurement container, the detection device 400 is used to perform laser ranging to achieve accurate measurement and provide a high-precision standard source so that the subsequent calibration process can be based on more accurate measurement values. By arranging the control device 600 and the adjustment device 500, the liquid level in the calibration container 100 can be automatically adjusted. According to the set value, automatic control of the required liquid level can be achieved. At the same time, the adjusting device 500 is configured as a combined structure of multiple solenoid valves and a speed-regulating water pump 5212, which can control the liquid level to the required value in terms of coarse adjustment and fine adjustment. By configuring the switching value collection channel and the analog value collection channel on the operating device 610, automatic calibration of different forms of liquid level gauges can be achieved, and the calibration results can be visually displayed on the display screen 612. That is to say, through the combination of the connected measurement container and calibration container 100, the control device 600, the detection device 400 and the adjustment device 500, the accuracy of the calibration is improved during the calibration process. In addition, by arranging the calibration container 100 into a telescopic structure, the liquid level meter calibration device is facilitated to be carried and operated.

Therefore, the liquid level gauge calibration device provided by the embodiment of the present application eliminates cumbersome manual operations, reduces personnel time investment, and improves the efficiency of calibration and testing. At the same time, the liquid level gauge calibration device can be automatically controlled. Through the mutual cooperation of the detection device 400, the control device 600 and the adjustment device 500, the risk of human error is reduced, which is beneficial to improving the calibration accuracy and improving the reliability of important equipment.

The technical features of the above embodiments can be combined in any way. To simplify the description, 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, all possible combinations should be used. It is considered to be within the scope of this manual.

The above-described embodiments only express several implementation modes of the present application. The descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all fall within the protection scope of the present application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

A liquid level gauge calibration device, which includes:

Calibration container, the calibration container has a first cavity, the first cavity is used to accommodate liquid and install a liquid level meter to be calibrated;

Test container, the test container has a second cavity, the second cavity is connected with the first cavity, so that when the first cavity contains liquid, the second cavity The body has the same liquid level height as the first cavity;

A floating block, which is arranged in the second cavity and can float following changes in the liquid level in the second cavity;

A detection device is provided on the test container; the detection device is used to emit laser toward the floating block and receive the laser reflected by the floating block to determine the liquid level height in the second cavity;

an adjustment device for injecting and discharging liquid into the first cavity; and

A control device, the control device is respectively connected to the detection device and the adjustment device; the control device is used to control the action of the adjustment device according to the liquid level height in the second cavity determined by the detection device.
The liquid level gauge calibration device according to claim 1, wherein 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, and the bottom wall and the side walls surround the first cavity;

Wherein, the plane where the reflective surface is located and the plane where the bottom wall is located are parallel to each other.
The liquid level gauge calibration device according to claim 1, wherein the adjustment device includes:

A liquid injection pipe, the mouth of one end of the liquid injection pipe is connected with the first cavity; and

An adjustment component is provided on the liquid injection pipe; the adjustment component includes a first sub-adjustment component and a second sub-adjustment component arranged in parallel;

Wherein, the first sub-adjustment component is used to respond to the control signal of the control device to conduct or block the passage of liquid into the first cavity through the liquid injection pipe;

The second sub-adjustment component is used to respond to the control signal of the control device to open or block the passage of liquid flowing out from the first cavity to the liquid injection pipe and outflow.
The liquid level gauge calibration device according to claim 3, wherein the first sub-adjustment component includes a first solenoid valve.
The liquid level gauge calibration device according to claim 4, wherein the first sub-adjustment component further includes a water pump connected in series with the first solenoid valve.
The liquid level gauge calibration device according to claim 5, wherein the water pump has a first operating speed and a second operating speed;

When the difference between the measured liquid level height and the theoretical liquid level height in the second cavity is within the preset range, the water pump operates at the first operating speed in response to the control signal of the control device;

When the difference between the measured liquid level height and the theoretical liquid level height in the second cavity is outside the preset range, the water pump operates at the second operating speed in response to the control signal of the control device;

Wherein, the first operating speed is smaller than the second operating speed.
The liquid level gauge calibration device according to any one of claims 3-6, wherein the second sub-adjustment component includes a second solenoid valve.
The liquid level gauge calibration device according to claim 7, wherein the second sub-adjustment component further includes a third solenoid valve connected in parallel with the second solenoid valve;

Wherein, the second solenoid valve is a switch valve, and the third solenoid valve is a flow valve.
The liquid level gauge calibration device according to claim 8, wherein the second sub-adjustment component has a first operating mode and a second operating mode;

When the difference between the measured liquid level height and the theoretical liquid level height in the second cavity is within the preset range, the second sub-adjustment component operates in the first operating mode in response to the control signal of the control device. , the second solenoid valve is closed, and the third solenoid valve is opened;

When the difference between the measured liquid level and the theoretical liquid level in the second cavity is outside the preset range, the second sub-adjustment component operates in the second operating mode in response to the control signal of the control device. , the second solenoid valve is opened, and the third solenoid valve is closed.
The liquid level gauge calibration device according to any one of claims 1-9, wherein the control device includes a control panel 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;

Wherein, the control board is used to feed back the detection signal of the detection device to the controller;

The controller is used to determine an adjustment signal according to the detection signal, and the control board is also used to control the action of the adjustment device according to the adjustment signal.
The liquid level gauge calibration device according to claim 10, wherein the control device further includes an operating device;

The operating device includes an operating body and a display screen provided on the operating body;

The control panel and the controller are integrated into the operating body; the display screen is connected to the control panel and is used to display the theoretical liquid level height and the measured liquid level height;

Wherein, the measured liquid level height is the liquid level height in the second cavity determined by the detection device.
The liquid level gauge calibration device according to claim 11, wherein the operating body is provided with a first signal interface and a second signal interface respectively connected to the control panel;

The first signal interface is used to receive current signals, and the second signal interface is used to receive dry contact signals.
The liquid level meter calibration device according to any one of claims 1 to 9, wherein the liquid level meter calibration device further includes a base;

The base is provided with the calibration container and the test container;

The calibration container is configured to be telescopic in a direction perpendicular to the base, and the test container is detachably connected to the base.
The liquid level gauge calibration device according to claim 13, wherein the base is provided with a third cavity, and a first opening, a second opening, and a third opening respectively connected with the third cavity;

Wherein, 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 The regulating device injects and discharges liquid into the first cavity via the third opening.
The liquid level gauge calibration device according to claim 14, wherein the first opening and the second opening are both located above the third opening.
The liquid level gauge calibration device according to claim 15, wherein the first opening and the second opening are provided on the top of the base, and the third opening is provided on one side of the bottom of the base.
The liquid level gauge calibration device according to claim 16, wherein the plane where the first opening is located is a first plane, and the plane where the second opening is located is a second plane;

The first plane and the second plane coincide with each other.