Water filling and draining calibration device and method for safety-level floating ball type liquid level transmitter

Abstract

The invention provides a water filling and draining calibration device of a safety level floating ball type liquid level transmitter. The water filling and draining calibration device of the safety level floating ball type liquid level transmitter comprises a measurement switching module, a controller, a peristaltic pump, a liquid storage tank and a pressure transmitter. And a first pipeline interface of the measurement switching module is connected with a pollution discharge interface at the bottom of a buoy of the measured safety-level floating ball type liquid level transmitter. And the second pipeline interface of the measurement switching module is connected with the pressure transmitter. And the controller is in communication connection with the peristaltic pump and the pressure transmitter. And the peristaltic pump is connected with the measurement switching module and the liquid storage tank. And the controller is used for collecting a current signal of the pressure transmitter and controlling the peristaltic pump to extract or discharge the desalted water into the liquid storage tank according to the current signal of the pressure transmitter. According to the safety level liquid level transmitter, the liquid level height is obtained through the current signal of the pressure transmitter, water filling and drainage calibration is automatically controlled through the controller, and automatic water filling and drainage calibration of the safety level liquid level transmitter is achieved.

Description

Technical Field

[0001] The present application belongs to the technical field of liquid level meter calibration, and specifically relates to a filling and drainage calibration device and method for a safety-grade float-type liquid level transmitter. Background Art

[0002] At present, due to the high radiation protection requirements of nuclear power plants and high measurement accuracy requirements of liquid level gauges, the liquid level gauge calibration period window is short, and safety-grade float-type liquid level transmitters generally use the manual water filling calibration method, resulting in low calibration efficiency, heavy workload, low calibration control accuracy, and equipment contamination by radioactivity. Summary of the invention

[0003] In view of this, the embodiments of the present application are committed to providing a filling and water discharge calibration device and method for a safety-grade float-type liquid level transmitter, which obtains the liquid level height by utilizing the current signal of the pressure transmitter and automatically controls the filling and water discharge calibration by utilizing a controller, so as to solve the problems of low calibration efficiency, large workload, low calibration control accuracy and radioactive contamination of the equipment caused by the manual water filling and calibration method of the existing safety-grade float-type liquid level transmitter.

[0004] The first aspect of the present application provides a filling and drainage calibration device for a safety-level float-type liquid level transmitter, which includes a measurement adapter module, a controller, a peristaltic pump, a liquid storage tank, and a pressure transmitter. The first pipe interface of the measurement adapter module is connected to the sewage discharge interface at the bottom of the float of the safety-level float-type liquid level transmitter under test. The second pipe interface of the measurement adapter module is connected to the pressure transmitter. The controller is communicatively connected to the peristaltic pump and the pressure transmitter. The peristaltic pump is connected to the measurement adapter module and the liquid storage tank. The controller is used to collect the current signal of the pressure transmitter, and control the peristaltic pump to extract or discharge desalted water into the liquid storage tank according to the current signal of the pressure transmitter to achieve the liquid level in the float of the safety-level float-type liquid level transmitter under test to rise or fall to the calibration level.

[0005] In a specific embodiment of the present application, the safety-grade float type liquid level transmitter filling and drainage calibration device also includes a host computer. The host computer is used to receive the calibration liquid level set by the user. The controller is communicatively connected with the host computer and is used to receive the calibration liquid level sent by the host computer.

[0006] In a specific implementation of the present application, the host computer is a tablet notebook.

[0007] In a specific embodiment of the present application, the safety-grade float type liquid level transmitter filling and draining calibration device further comprises a power supply which is electrically connected to the controller and the peristaltic pump and is used to supply power to the controller and the peristaltic pump.

[0008] In a specific embodiment of the present application, the main unit of the filling and drainage calibration device of the safety-grade float type liquid level transmitter is mainly composed of a controller, a power supply and a peristaltic pump integrated into one body.

[0009] The second aspect of the present application provides a method for calibrating the filling and drainage of a safety-level float-type liquid level transmitter, which comprises: using a controller to control a peristaltic pump to extract deionized water from a liquid storage tank and fill it to the zero point of the safety-level float-type liquid level transmitter to be tested, as a calibration reference point; when performing an upstroke calibration of the safety-level float-type liquid level transmitter to be tested, according to the logic program compiled in the controller, the controller first reads the current signal of the pressure transmitter and converts it into a liquid level height through software, and calculates the difference with the first calibration point, and then controls the peristaltic pump to extract the storage liquid. The desalted water in the tank is filled into the safety-grade float-type liquid level transmitter under test. While filling, the controller reads the pressure transmitter data and calculates the liquid level height in real time until the liquid level reaches the first calibration point. When calibrating the downstroke of the safety-grade float-type liquid level transmitter under test, the controller first reads the current data of the pressure transmitter and converts it into the liquid level height through software, and calculates the difference with the second calibration point. According to the logic program compiled in the controller, the controller controls the peristaltic pump to discharge the desalted water into the liquid storage tank. While draining, the controller reads the pressure transmitter data and calculates the liquid level height in real time until the liquid level reaches the second calibration point.

[0010] In a specific embodiment of the present application, the above-mentioned controller is used to control the peristaltic pump to extract desalted water from the liquid storage tank and fill it to the zero point of the safety-level float-type liquid level transmitter under test as a calibration reference point. The filling and drainage calibration method of the safety-level float-type liquid level transmitter also includes: setting the zero position of the safety-level float-type liquid level transmitter under test, at least one first calibration point and at least one second calibration point through the host computer.

[0011] In a specific embodiment of the present application, the at least one first calibration point includes 25%, 50%, 75% and 100%.

[0012] In a specific embodiment of the present application, the at least one second calibration point includes 75%, 50%, 25% and 0%.

[0013] The beneficial effects of the technical solution of the present application are: realizing automated filling and drainage calibration of safety-grade liquid level transmitters, which can significantly reduce manual workload, improve calibration accuracy and efficiency, reduce the occurrence of human errors, and avoid radioactive contamination of calibration tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Shown is a schematic structural diagram of a filling and drainage calibration device for a safety-grade float-type liquid level transmitter provided in one embodiment of the present application.

[0015] Figure 2 Shown is a physical schematic diagram of a filling and drainage calibration device for a safety-grade float-type liquid level transmitter provided in one embodiment of the present application. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0017] At least one embodiment of the present application provides a filling and drainage calibration device for a safety-grade float-type liquid level transmitter, referring to Figure 1 The filling and drainage calibration device of the safety-level float type liquid level transmitter includes a measurement adapter module 1, a controller 2, a peristaltic pump 5, a liquid storage tank 6 and a pressure transmitter 7. The first pipeline interface of the measurement adapter module 1 is connected to the sewage discharge interface at the bottom of the float of the safety-level float type liquid level transmitter under test. The second pipeline interface of the measurement adapter module 1 is connected to the pressure transmitter 7. The controller 2 is communicatively connected with the peristaltic pump 5 and the pressure transmitter 7. The peristaltic pump 5 is connected with the measurement adapter module 1 and the liquid storage tank 6. The controller 2 is used to collect the current signal of the pressure transmitter 7, and control the peristaltic pump 5 to extract or discharge desalted water into the liquid storage tank 6 according to the current signal of the pressure transmitter 7 so as to realize the liquid level in the float of the safety-level float type liquid level transmitter under test rising or falling to the calibration liquid level.

[0018] According to the technical solution provided in the embodiment of the present application, automated filling and drainage calibration of the safety-grade liquid level transmitter is achieved, which can significantly reduce manual workload, improve calibration accuracy and efficiency, reduce the occurrence of human errors, and avoid radioactive contamination of calibration tools.

[0019] The calibration liquid level may be a default setting on the filling and drainage calibration device of the safety-grade float type liquid level transmitter, may be set by the user on the controller, or may be set in other ways.

[0020] In at least one embodiment of the present application, the safety-grade float type liquid level transmitter filling and drainage calibration device further includes a host computer 3. The host computer 3 is used to receive the calibration liquid level set by the user. The controller 2 is connected to the host computer 3 for communication and is used to receive the calibration liquid level sent by the host computer 3. In this way, by adding the host computer 3 and using the host computer 3 to receive the calibration liquid level set by the user, it is convenient for the user to remotely control the controller 2 using the host computer 3.

[0021] The host computer 3 may be any portable intelligent device. For example, in at least one embodiment of the present application, the host computer 3 is a tablet notebook.

[0022] In at least one embodiment of the present application, the safety-grade float type liquid level transmitter filling and drainage calibration device further includes a power supply 4. The power supply 4 is electrically connected to the controller 2 and the peristaltic pump 5, and the power supply 4 is used to power the controller 2 and the peristaltic pump 5. In this way, by adding a power supply 4 dedicated to powering the controller 2 and the peristaltic pump 5, the power supply stability is improved.

[0023] For example, the power supply voltage is 24V.

[0024] In at least one embodiment of the present application, reference Figure 1 and Figure 2 The host of the filling and drainage calibration device of the safety-level float type liquid level transmitter is mainly composed of a controller 2, a power supply 4 and a peristaltic pump 5. The host of the filling and drainage calibration device of the safety-level float type liquid level transmitter can also be integrated with a display panel, and the calibration liquid level can be set by the user on the display panel. The content displayed on the display panel can be the same as or different from the content displayed on the host computer 3.

[0025] At least one embodiment of the present application further provides a method for calibrating the filling and drainage of a safety-grade float-type liquid level transmitter. The method for calibrating the filling and drainage of a safety-grade float-type liquid level transmitter includes the following steps.

[0026] S2: Use the controller 2 to control the peristaltic pump 5 to extract the deionized water in the liquid storage tank 6 to fill the water to the zero point position of the safety-grade float-type liquid level transmitter to be tested, which serves as the calibration reference point.

[0027] S4: When performing the upper stroke calibration of the safety-grade float-type liquid level transmitter under test, according to the logic program compiled in the controller 2, the controller 2 first reads the current signal of the pressure transmitter 7 and converts it into the liquid level height through the software, and calculates the difference with the first calibration point, and then the controller 2 controls the peristaltic pump 5 to extract the desalted water in the liquid storage tank 6 and fill it into the safety-grade float-type liquid level transmitter under test. While filling, the controller 2 reads the data of the pressure transmitter 7 and calculates the liquid level height in real time until the liquid level reaches the first calibration point.

[0028] S6: When calibrating the downstroke of the safety-grade float-type liquid level transmitter under test, the controller 2 first reads the current data of the pressure transmitter 7 and converts it into the liquid level height through software, and calculates the difference with the second calibration point. According to the logic program compiled in the controller 2, the controller 2 controls the peristaltic pump 5 to discharge desalted water into the liquid storage tank 6. While draining water, the controller 2 reads the data of the pressure transmitter 7 and calculates the liquid level height in real time until the liquid level reaches the second calibration point.

[0029] It should be noted that during the calibration process, a rough adjustment is performed first, and then a fine adjustment is performed after approaching the corresponding calibration point, and finally the calibration of the corresponding calibration point is completed. According to the above S4, the calibration of each first calibration point of the upper stroke of the safety-level float-type liquid level transmitter under test can be performed. According to the above S6, the calibration of each second calibration point of the lower stroke of the safety-level float-type liquid level transmitter under test can be performed.

[0030] In at least one embodiment of the present application, before the above S2, the filling and drainage calibration method of the safety-grade float type liquid level transmitter also includes S1.

[0031] S1: Setting the zero position, at least one first calibration point and at least one second calibration point of the safety-grade float-type liquid level transmitter to be measured through the host computer 3.

[0032] The liquid level meter range to be calibrated is set in the host computer 3, and the software automatically sets the liquid level height of each calibration point;

[0033] In at least one embodiment of the present application, at least one first calibration point includes 25%, 50%, 75% and 100%, and at least one second calibration point includes 75%, 50%, 25% and 0%.

[0034] The technical solution adopted in this application is: using a high-speed peristaltic pump with a high-performance servo motor and controller, configuring a high-precision Bluetooth and wired pressure transmitter, and combining the latest software control technology and programming liquid level height control algorithm strategy to develop. During calibration, first set the liquid level height to be calibrated, use the controller to collect the current signal of the transmitter, convert it into the liquid level height through the software, and then control the servo motor to drive the peristaltic pump through the controller to adjust the liquid level height until the set liquid level height is reached; the calibration device has high water level stability, the water level rise or fall speed can be adjusted independently, and the control accuracy can reach up to 1mm; it meets the needs of periodic, large-scale, and repetitive measurement and calibration work in industry and enterprises. The fully automatic control of the calibration device, coupled with a comprehensive software layout design, makes the on-site safety-level liquid level meter calibration more convenient; the calibration device uses a peristaltic pump, and the radioactive water passes through the hose and does not directly contact the calibration device body, so the equipment will not be contaminated by radioactivity.

[0035] It should be noted that the combination of the various technical features in the embodiments of the present application is not limited to the combination described in the embodiments of the present application or the combination described in the specific embodiments, and all technical features described in the present application can be freely combined or combined in any way unless there is a contradiction between them.

[0036] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "comprises" and "includes" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0038] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A filling and drainage calibration device for a safety-grade float-type liquid level transmitter, characterized in that: Including measurement adapter module, controller, peristaltic pump, liquid storage tank and pressure transmitter, Among them, the first pipe interface of the measurement adapter module is connected to the sewage discharge interface at the bottom of the float of the safety-level float-type liquid level transmitter under test, the second pipe interface of the measurement adapter module is connected to the pressure transmitter, the controller is communicated with the peristaltic pump and the pressure transmitter, the peristaltic pump is connected to the measurement adapter module and the liquid storage tank, the controller is used to collect the current signal of the pressure transmitter, and control the peristaltic pump to extract or discharge desalted water into the liquid storage tank according to the current signal of the pressure transmitter to realize the liquid level in the float of the safety-level float-type liquid level transmitter under test to rise or fall to the calibration liquid level.

2. The filling and drainage calibration device of the safety-grade float type liquid level transmitter according to claim 1 is characterized in that: It also includes the host computer, The host computer is used to receive the calibration liquid level set by the user; the controller is connected to the host computer for communication and is used to receive the calibration liquid level sent by the host computer.

3. The filling and drainage calibration device of the safety-grade float type liquid level transmitter according to claim 2 is characterized in that: The host computer is a tablet notebook.

4. The filling and drainage calibration device of the safety-grade float type liquid level transmitter according to any one of claims 1 to 3, characterized in that: Also includes a power supply, The power supply is electrically connected to the controller and the peristaltic pump, and is used to supply power to the controller and the peristaltic pump.

5. The filling and drainage calibration device of the safety-grade float type liquid level transmitter according to claim 4 is characterized in that: The main unit of the filling and drainage calibration device of the safety-grade float type liquid level transmitter is mainly composed of a controller, a power supply and a peristaltic pump integrated into one body.

6. A method for calibrating the filling and drainage of a safety-grade float-type liquid level transmitter, characterized in that: include: The controller is used to control the peristaltic pump to extract the desalted water in the liquid storage tank and fill it to the zero point of the safety-grade float-type liquid level transmitter to be tested, which serves as the reference point for calibration; When performing the upper stroke calibration of the safety-level float-type liquid level transmitter under test, according to the logic program compiled in the controller, the controller first reads the current signal of the pressure transmitter and converts it into the liquid level height through the software, and calculates the difference with the first calibration point, and then controls the peristaltic pump to extract the deionized water in the storage tank and fill it into the safety-level float-type liquid level transmitter under test. While filling the water, the controller reads the pressure transmitter data and calculates the liquid level height in real time until the liquid level reaches the first calibration point; When calibrating the downstroke of the safety-grade float-type liquid level transmitter under test, the controller first reads the current data of the pressure transmitter and converts it into the liquid level height through software, and calculates the difference with the second calibration point. According to the logic program compiled in the controller, the controller controls the peristaltic pump to discharge desalted water into the storage tank. While draining water, the controller reads the pressure transmitter data and calculates the liquid level height in real time until the liquid level reaches the second calibration point.

7. The filling and drainage calibration method of the safety-grade float type liquid level transmitter according to claim 6 is characterized in that: Before using the controller to control the peristaltic pump to extract deionized water from the liquid storage tank and fill it to the zero point of the safety-grade float-type liquid level transmitter to be measured as the reference point for calibration, the method also includes: The zero position, at least one first calibration point and at least one second calibration point of the safety-level float type liquid level transmitter to be measured are set through the host computer.

8. The filling and drainage calibration method of the safety-grade float type liquid level transmitter according to claim 7 is characterized in that: The at least one first calibration point includes 25%, 50%, 75% and 100%.

9. The filling and drainage calibration method of the safety-grade float type liquid level transmitter according to claim 7 is characterized in that: The at least one second calibration point includes 75%, 50%, 25% and 0%.

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