Verification device of floating ball liquid level sensor

Abstract

The utility model is suitable for the technical field of instrument test calibration, and provides a verification device of a floating ball liquid level sensor, which comprises a pressure adjusting device and a pipeline, one end of the pipeline is communicated with the pressure adjusting device, and the other end of the pipeline is hermetically connected and communicated with a measuring cylinder of the floating ball liquid level sensor, the pressure adjusting device is used for adjusting the air pressure in the measuring cylinder; therefore, the liquid level in the measuring cylinder rises and falls. The air pressure in the measuring cylinder is changed after the pressure adjusting device is in sealed connection with the exhaust port in the measuring cylinder, so that the height of the magnetic floating ball is adjusted, the function of the floating ball liquid level sensor is verified, a flange does not need to be opened in the process, the risk of falling of foreign matter does not exist, workers do not need to be located beside a reactor core pool all the time for operation, and the working efficiency is improved. And the risks of personnel falling and injury are also reduced.

Description

Technical Field

[0001] The present application relates to the technical field of instrument testing and calibration, and in particular to a verification device for a float liquid level sensor. Background Art

[0002] The core water pool of the nuclear power unit uses a float level sensor 200 to measure the liquid level. Figure 2 As shown, the float liquid level sensor 200 is fixed in the measuring cylinder 90 via the flange 95. Figure 1 and Figure 2 As shown, there is a magnetic float 91 in the measuring tube 90, which contains a permanent magnet and floats in the water near the resistor chain. The float liquid level sensor 200 can also be called a resistor chain liquid level sensor. The resistor chain contains a plurality of resistors 92 connected in series, and a magnetic switch 93 (such as a reed switch) is connected to the node between two adjacent resistors 92. When the magnetic float 91 reaches different heights with the water level, the magnetic field of the permanent magnet inside it will ensure that the reed switch at this level is closed. After different reed switches are turned on, different numbers of resistors 92 are connected to the circuit. Thus, the water level signal is converted into an electrical signal. Conversely, the signal processing unit 94 can obtain the resistance value by measuring the current in the circuit, and then obtain the number of resistors 92 connected to the circuit, and finally determine the water level at this time.

[0003] The liquid level of the core pool of a nuclear power unit is an important process quantity signal and needs to be monitored in real time. In order to ensure the normal function of the float liquid level sensor 200, preventive functional verification of the float liquid level sensor 200 is required for each overhaul.

[0004] According to the above, the float liquid level sensor 200 is installed at the side of the pool, and when performing functional verification, the flange 95 needs to be opened to expose the magnetic float 91 in the measuring tube 90. For this purpose, a hanging basket operation is required to implement it. This operation is defined as a level 1 industrial safety risk, with a high risk of personnel falling and injury, and there is also a risk of tools falling into the pool to form core foreign matter. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a verification device for a float liquid level sensor, aiming to solve the technical problems of high personnel safety risks and high foreign matter falling risks during the existing float liquid level sensor function verification.

[0006] An embodiment of the present application is implemented as follows: a verification device for a float liquid level sensor includes a pressure regulating device and a pipeline, one end of the pipeline is connected to the pressure regulating device, and the other end of the pipeline is sealed and connected to a measuring cylinder of the float liquid level sensor, and the pressure regulating device is used to adjust the air pressure in the measuring cylinder to make the liquid level in the measuring cylinder rise and fall.

[0007] In one embodiment, the pressure regulating device includes an air suction pump and an air charging pump connected in parallel to one end of the pipeline, the air suction pump is used to evacuate air from the measuring cylinder, and the air charging pump is used to inflate the measuring cylinder; or, the pressure regulating device includes an air charging and suction pump, which is used to evacuate and inflate the measuring cylinder.

[0008] In one embodiment, the verification device of the float liquid level sensor also includes a sealing joint, and the other end of the pipeline is sleeved with the exhaust pipe of the measuring cylinder to be connected with the exhaust port of the exhaust pipe; the sealing joint is arranged on the outer periphery of the pipeline and locks the pipeline and the exhaust pipe.

[0009] In one embodiment, the sealing joint includes a clamp and a threaded member, the clamp is sleeved on the pipeline, and the threaded member passes through one end of the clamp and is threadedly connected to the other end of the clamp.

[0010] In one embodiment, the verification device of the float liquid level sensor further includes a liquid level sensor disposed on the bottom wall of the exhaust pipe.

[0011] In one embodiment, the verification device of the float liquid level sensor further includes a pressure gauge, and the pressure gauge is used to measure the air pressure in the measuring cylinder.

[0012] In one embodiment, the pressure gauge is connected to the pipeline and is located between the pressure regulating device and the measuring cylinder.

[0013] In one embodiment, the verification device of the float liquid level sensor further includes a liquid level calculation unit, which is used to calculate the pressure difference inside and outside the measuring cylinder and the liquid level height difference inside and outside the measuring cylinder according to the pressure value of the pressure gauge.

[0014] In one embodiment, the verification device of the float liquid level sensor further includes a controller, wherein the controller is connected to the pressure regulating device, and the pressure regulating device operates according to a control signal of the controller, and a pressure adjustment range is preset in the controller.

[0015] In one embodiment, the exhaust pipe on the measuring cylinder for sealing connection with the pipeline extends horizontally or downward, and the pressure regulating device is higher than the exhaust pipe.

[0016] The verification device of the float liquid level sensor provided in the embodiment of the present application has the beneficial effects of:

[0017] The verification device of the float liquid level sensor provided in the embodiment of the present application includes a pressure regulating device and a pipeline, one end of the pipeline is connected to the pressure regulating device, and the other end is sealed and connected to the measuring cylinder of the float liquid level sensor, and the pressure regulating device is used to adjust the air pressure in the measuring cylinder to make the liquid level in the measuring cylinder rise and fall. The verification device of the float liquid level sensor provided in the embodiment of the present application changes the air pressure in the measuring cylinder by using the pressure regulating device to be sealed and connected to the exhaust port on the measuring cylinder to adjust the height of the magnetic float and verify the function of the float liquid level sensor. During the process, there is no need to open the flange at the upper end of the measuring cylinder, and there is no risk of foreign matter falling. Moreover, the staff does not need to be at the core water pool all the time to operate, which also reduces the risk of personnel falling and injury. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the working principle of the float liquid level sensor;

[0020] Figure 2 It is a schematic diagram of the arrangement structure of the float liquid level sensor in the core water pool of a nuclear power unit;

[0021] Figure 3 It is a structural schematic diagram of a verification device for a float liquid level sensor provided in an embodiment of the present application;

[0022] Figure 4 It is another structural schematic diagram of the verification device of the float liquid level sensor provided in the embodiment of the present application;

[0023] Figure 5 It is a schematic diagram of the use of the verification device of the float liquid level sensor provided in the embodiment of the present application, wherein the liquid level in the measuring cylinder is a high liquid level;

[0024] Figure 6 It is a schematic diagram of the use of the verification device of the float liquid level sensor provided in the embodiment of the present application, wherein the liquid level in the measuring cylinder is a low liquid level.

[0025] The meanings of the marks in the figure are:

[0026] 200-Float level sensor;

[0027] 90-measuring tube, 91-magnetic float, 92-resistance, 93-magnetic switch, 94-signal processing unit, 95-flange, 96-exhaust pipe, 960-exhaust port;

[0028] 100-Verification device for float level sensor;

[0029] 21-controller, 22-alarm, 23-liquid level calculation unit;

[0030] 3-pressure regulating device, 31-air suction pump, 32-air charging pump, 33-air charging and air suction pump;

[0031] 4-Pipeline;

[0032] 5- Pressure gauge;

[0033] 6-sealing joint, 61-clamp, 62-threaded part;

[0034] 7-Liquid level sensor. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly or indirectly fixed or disposed on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of this patent. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0037] In order to illustrate the technical solution described in this application, a detailed description is given below in conjunction with specific drawings and embodiments.

[0038] See also Figure 2As shown, a measuring cylinder 90 is provided in the core water pool of the nuclear power unit, and the lower end of the measuring cylinder 90 is open and used to communicate with the water in the core water pool. A detachable flange 95 is provided at the upper end of the measuring cylinder 90, and a magnetic float 91 of the float liquid level sensor 200 is arranged in the measuring cylinder 90 and floats with the liquid surface in the measuring cylinder 90. An exhaust pipe 96 is also provided on the side of the measuring cylinder 90, and the interior of the measuring cylinder 90 is connected to the external atmospheric pressure through the exhaust port 960 on the exhaust pipe 96, so that the liquid level inside and outside the measuring cylinder 90 is consistent. In this way, the height of the magnetic float 91 in the measuring cylinder 90 indicates the liquid level height in the core water pool at this time.

[0039] When the float liquid level sensor 200 is in normal use, the flange 95 is assembled on the upper end of the measuring tube 90 to seal the upper end of the measuring tube 90 to prevent foreign matter from falling into the measuring tube 90 and the core water pool.

[0040] See also Figure 3 As shown, the embodiment of the present application provides a verification device 100 for a float liquid level sensor, which does not need to open the flange 95 when verifying the function of the float liquid level sensor 200.

[0041] Please refer to Figure 3 As shown, the verification device 100 of the float liquid level sensor includes a pressure regulating device 3 and a pipeline 4, one end of the pipeline 4 is connected to the pressure regulating device 3, and the other end of the pipeline 4 is sealed and connected to the measuring cylinder 90 of the float liquid level sensor 200, and the pressure regulating device 3 is used to adjust the air pressure in the measuring cylinder 90. In other words, the measuring cylinder 90 cannot be connected to the external atmospheric pressure at this time, but is only connected to the pressure regulating device 3. When the air pressure in the measuring cylinder 90 is adjusted by the pressure regulating device 3, the liquid level in the measuring cylinder 90 will change.

[0042] When the gas pressure in the measuring tube 90 is increased by the pressure regulating device 3, the liquid level in the measuring tube 90 will be lower than the liquid level in the core water pool. Figure 6 When the pressure in the measuring tube 90 is reduced by the pressure regulating device 3, the liquid level in the measuring tube 90 will be higher than the liquid level in the core water pool, see Figure 5 shown.

[0043] In this way, the pressure regulating device 3 can be used to place the magnetic float 91 at different heights, and further, it can be verified whether the magnetic switches 93 at different heights of the float liquid level sensor 200 can be closed normally and whether all parts of the circuit are connected normally.

[0044] The verification device 100 of the float liquid level sensor provided in the embodiment of the present application adopts a pressure regulating device 3 and a sealing connection with the exhaust port 960 on the measuring cylinder 90 to change the air pressure in the measuring cylinder 90 to adjust the height of the magnetic float 91 to verify the function of the float liquid level sensor 200. During the process, there is no need to open the flange 95, and there is no risk of foreign objects falling. Moreover, the staff does not need to be always at the edge of the core water pool to operate, which also reduces the risk of personnel falling and injury.

[0045] See also Figure 4 As shown, in one embodiment, the pressure regulating device 3 includes an air pump 31 and an air pump 32 connected in parallel to one end of the pipeline 4, the air pump 31 is used to evacuate the measuring cylinder 90, and the air pump 32 is used to inflate the measuring cylinder 90. During verification, the air pump 31 and the air pump 32 are operated in turn.

[0046] Or, if Figure 3 As shown, in one embodiment, the pressure regulating device 3 includes an air-inflating and air-extracting pump 33, which is used to evacuate and inflate the measuring cylinder 90. That is, the actions of evacuating and inflating are achieved using the same structure.

[0047] like Figure 3 and Figure 4 As shown, the verification device 100 of the float liquid level sensor also includes a sealing joint 6. The other end of the pipeline 4 is sleeved with an exhaust pipe 96 of the measuring tube 90 to communicate with the exhaust port 960 of the exhaust pipe 96. The sealing joint 6 is arranged on the outer periphery of the pipeline 4 and locks the pipeline 4 and the exhaust pipe 96 so that the pipeline 4 and the exhaust pipe 96 are sealed and leak-proof.

[0048] Among them, Figure 3 and Figure 4 As shown, in one embodiment, the verification device 100 of the float liquid level sensor further includes a liquid level sensor 7, which is arranged on the bottom wall of the exhaust pipe 96. Optionally, the liquid level sensor 7 is arranged as close to the inner wall of the measuring cylinder 90 as possible, that is, the liquid level sensor 7 is arranged as far away from the sealing joint 6 as possible. The purpose of such arrangement is that if the liquid level continues to rise and reaches the exhaust pipe 96 during the process of evacuating the measuring cylinder 90, at this time, the liquid level sensor 7 can measure the water level signal in the first time, and the staff can stop the pressure regulating device 3 according to the measured water level signal to prevent water from further entering the pressure regulating device 3, etc.

[0049] See also Figure 3 and Figure 4As shown, in the verification device 100 of the float liquid level sensor, the pressure regulating device 3 is higher than the exhaust port 960 of the exhaust pipe 96. The purpose of this design is that even if the liquid level in the measuring cylinder 90 rises to the exhaust pipe 96 under special circumstances, at this time, the water can be temporarily stored in the exhaust pipe 96 and is difficult to reach the pressure regulating device 3, so that a certain amount of time is reserved for the staff to close the pressure regulating device 3.

[0050] For details, please refer to Figure 3 and Figure 4 As shown, the exhaust pipe 96 is horizontal or extends downward away from the measuring cylinder 90, and the exhaust port 960 itself avoids the risk of foreign matter falling into the measuring cylinder 90. The pipeline 4 is bent, and the end connected to the exhaust pipe 96 is lower than the end connected to the pressure regulating device 3.

[0051] See also Figure 3 and Figure 4 As shown, in the verification device 100 of the float liquid level sensor, the sealing joint 6 includes a clamp 61 and a threaded member 62. The clamp 61 is in an open ring shape and is sleeved on the pipeline 4. The threaded member 62 passes through one end of the clamp 61 and is threadedly connected to the other end of the clamp 61. By rotating the threaded member 62, the two ends of the clamp 61 can be brought close to each other, so that the pipeline 4 is pressed against the outer peripheral surface of the exhaust pipe 96.

[0052] Not limited to the above, in other optional embodiments, the sealing joint 6 can be replaced with other forms, which are not listed one by one.

[0053] In one embodiment, if Figure 3 and Figure 4 As shown, the verification device 100 of the float liquid level sensor also includes a pressure gauge 5, which measures the air pressure in the measuring cylinder 90 to provide the staff with relevant information about the pressure difference between the inside and outside of the measuring cylinder 90. In addition, the staff can convert the height difference of the liquid level inside and outside the measuring cylinder 90 according to the pressure difference, so that during the verification process, the staff can match the liquid level information of the magnetic float 91 with the closure of the magnetic switch 93 one by one.

[0054] It should be noted that in actual applications, the circuit, resistor 92, and magnetic switch 93 of the float liquid level sensor 200 are fixed in their respective positions. Compared with the failure of the magnetic switch 93 itself, the possibility of short circuit and open circuit in the resistor 92 and the circuit is smaller. Therefore, as long as the corresponding number of current signals can be measured during the rise and fall of the magnetic float 91, it can be proved that each magnetic switch 93 is normal. If the corresponding current signal cannot be measured at a certain point, it means that the magnetic switch 93 has failed, and then the float liquid level sensor 200 needs to be disassembled and repaired as a whole. Therefore, during the verification process, it is also possible that the staff does not need to know the actual information of the liquid level.

[0055] Specifically, see Figure 3 and Figure 4 As shown, the pressure gauge 5 is connected to the pipeline 4 and is located between the pressure regulating device 3 and the measuring cylinder 90. The type of the pressure gauge 5 is not limited.

[0056] In one embodiment, if Figure 3 and Figure 4 As shown, the verification device 100 of the float liquid level sensor also includes a liquid level calculation unit 23, which is used to calculate the pressure difference between the inside of the measuring cylinder 90 and the atmospheric pressure according to the pressure value of the pressure gauge 5, and then calculate the liquid level difference inside and outside the measuring cylinder 90. In other words, the liquid level calculation unit 23 can replace manual calculation to directly obtain the liquid level difference inside and outside the measuring cylinder 90. The liquid level calculation unit 23 can be a component electrically connected to the pressure gauge 5, which directly reads the pressure value of the pressure gauge 5 and performs calculations; it can also be a component independent of the pressure gauge 5, and the staff manually inputs the pressure value of the pressure gauge 5 into the controller 21.

[0057] The liquid level difference inside and outside the measuring cylinder 90 is calculated by the following formula 1:

[0058] h=ΔP / ρg; (Formula 1)

[0059] Among them, h is the liquid level height difference inside and outside the measuring tube 90, the unit is meter, ΔP is the pressure difference inside and outside the measuring tube 90, the unit is Pa, ρ is the density of water in the core water pool, the unit is kilograms per cubic meter, g is the acceleration of gravity, which can be taken as 9.8 Newtons per kilogram.

[0060] The pressure difference ΔP inside and outside the measuring cylinder 90 is calculated by the following formula 2:

[0061] ΔP=P1-P2; (Formula 2)

[0062] P1 is the pressure in the measuring cylinder 90, and P2 is the atmospheric pressure, both in Pa.

[0063] The core water pool of the nuclear power unit adopts multiple liquid level gauges for redundant measurement, and the liquid level gauge to be verified (the float liquid level sensor 200 of the embodiment of the present application) is eliminated, and the average value h1 of the redundant measurements of the other multiple liquid level gauges is taken as the liquid level value of the core water pool of the nuclear power unit.

[0064] The actual height of the magnetic float 91 in the measuring tube 90 (relative to the sea level) is calculated by the following formula 3:

[0065] H=h1-h+Δh; (Formula 3)

[0066] Wherein, H is the actual height of the magnetic float 91, in meters; Δh is the correction amount of the influence of the gravity of the magnetic float 91 and other factors on the liquid level in the measuring barrel, in meters.

[0067] The liquid level in the measuring barrel will rise or fall during the process of pumping and filling the measuring tube 90. The cross-sectional area of ​​the measuring barrel is negligible relative to the area of ​​the core water pool, so the change in the liquid level in the measuring barrel resulting in the change in the liquid level of the nuclear power unit core water pool is negligible.

[0068] Furthermore, if Figure 3 and Figure 4 As shown, the verification device 100 of the float liquid level sensor also includes a controller 21, which is connected to the pressure regulating device 3, and the pressure regulating device 3 operates according to the control signal of the controller 21. For example, the controller 21 controls the start, stop, air extraction rate, and air filling rate of the pressure regulating device 3, or performs air extraction and air filling in a specific manner.

[0069] In one optional embodiment, a pressure adjustment range is preset in the controller 21, and the controller 21 controls the pressure regulating device 3 to adjust the pressure within the range to avoid the problem of excessive or insufficient pressure causing an unexpected liquid level.

[0070] Further, see Figure 3 and Figure 4 As shown, the verification device 100 of the float liquid level sensor also includes an alarm 22, and the alarm 22 is connected to the controller 21. The controller 21 is configured to control the alarm 22 to output an alarm signal when the pressure adjustment speed of the pressure regulating device 3 is not within a preset range, or the controller 21 is connected to the pressure gauge 5, and when the pressure value of the pressure gauge 5 exceeds the preset pressure adjustment range, the alarm 22 is controlled to output an alarm signal.

[0071] The alarm 22 may be an alarm structure independent of the controller 21, or an alarm module integrated in the controller 21. The form of the alarm signal is not limited, such as a light signal, an acoustic signal, etc.

[0072] 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 and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A verification device for a float liquid level sensor, characterized in that: It comprises a pressure regulating device and a pipeline, one end of the pipeline is connected to the pressure regulating device, and the other end of the pipeline is sealed and connected to the measuring cylinder of the float liquid level sensor. The pressure regulating device is used to adjust the air pressure in the measuring cylinder to make the liquid level in the measuring cylinder rise and fall.

2. The verification device of the float liquid level sensor according to claim 1, characterized in that: The pressure regulating device includes an air suction pump and an air charging pump connected in parallel to one end of the pipeline, the air suction pump is used to evacuate the measuring cylinder, and the air charging pump is used to inflate the measuring cylinder; or, the pressure regulating device includes an air charging and air suction pump, which is used to evacuate and inflate the measuring cylinder.

3. The verification device of the float liquid level sensor according to claim 1, characterized in that: The verification device of the float liquid level sensor also includes a sealing joint. The other end of the pipeline is sleeved with the exhaust pipe of the measuring cylinder to communicate with the exhaust port of the exhaust pipe. The sealing joint is arranged on the outer periphery of the pipeline and locks the pipeline and the exhaust pipe.

4. The verification device of the float liquid level sensor according to claim 3, characterized in that: The sealing joint comprises a clamp and a threaded member, wherein the clamp is sleeved with the pipeline, and the threaded member passes through one end of the clamp and is threadedly connected with the other end of the clamp.

5. The verification device of the float liquid level sensor according to claim 3, characterized in that: The verification device of the float liquid level sensor also includes a liquid level sensor, which is arranged on the bottom wall of the exhaust pipe.

6. The verification device of the float liquid level sensor according to claim 1, characterized in that: The verification device of the float liquid level sensor also includes a pressure gauge, which is used to measure the air pressure in the measuring cylinder.

7. The verification device of the float liquid level sensor according to claim 6, characterized in that: The pressure gauge is connected to the pipeline and is located between the pressure regulating device and the measuring cylinder.

8. The verification device of the float liquid level sensor according to claim 7, characterized in that: The verification device of the float liquid level sensor also includes a liquid level calculation unit, which is used to calculate the pressure difference inside and outside the measuring cylinder and the liquid level height difference inside and outside the measuring cylinder according to the pressure value of the pressure gauge.

9. The verification device for a float liquid level sensor according to any one of claims 1 to 8, characterized in that: The verification device of the float liquid level sensor also includes a controller, which is connected to the pressure regulating device. The pressure regulating device operates according to a control signal of the controller, and a pressure adjustment range is preset in the controller.

10. The verification device for a float liquid level sensor according to any one of claims 1 to 8, characterized in that: The exhaust pipe on the measuring cylinder for sealing connection with the pipeline extends horizontally or downwards, and the pressure regulating device is higher than the exhaust pipe.

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