Air pressure adjusting device for verifying liquid level instrument in spent fuel pool

Abstract

The utility model relates to an air pressure adjusting device for verifying a liquid level instrument in a spent fuel pool, which comprises a box body, and an internal pipeline, an air inlet pipeline, an exhaust pipeline and an air supply pipeline are arranged in the box body; the box body is provided with an air source interface capable of being connected with an external air source, an exhaust interface capable of exhausting air outwards and an instrument interface capable of supplying air outwards; one end of the air inlet pipeline is connected with the internal pipeline, and the other end of the air inlet pipeline is connected with the air source interface; one end of the exhaust pipeline is connected with the internal pipeline, and the other end of the exhaust pipeline is connected with the exhaust interface; one end of the air supply pipeline is connected with the internal pipeline, and the other end of the air supply pipeline is connected with the instrument interface; and the high-precision pressure gauge is connected with the internal pipeline and is used for monitoring and displaying an air pressure value in the internal pipeline. The air pressure adjusting device has the remarkable advantages in the aspects of flexible operation and the like, and the requirement for providing stable pressure for the liquid level instrument in the spent fuel pool for verification can be effectively met.

Description

Technical Field

[0001] This application relates to the field of nuclear power generation technology, and in particular to a pressure regulating device for verifying liquid level gauges in spent fuel pools. Background Technology

[0002] Existing pressure measurement devices cannot stabilize pressure, leading to significant fluctuations in measurement results and affecting data reliability. Secondly, the accuracy of pressure measurement is low, failing to meet the requirements of high-precision measurements. Furthermore, pressure control is also a challenge; existing equipment struggles to achieve precise pressure regulation, making the entire calibration process less rigorous. In summary, current technologies cannot adequately address these issues; therefore, a pressure regulation device specifically designed for controlling the pressure of the measuring tube in the calibration of level measurement devices in spent fuel pools is currently unavailable. Utility Model Content

[0003] This application provides a pressure regulating device for verifying level gauges in spent fuel pools, which solves the problem that existing pressure devices cannot provide stable pressure.

[0004] The technical solution adopted by this application to solve its technical problem is: a pressure regulating device for verifying liquid level gauges in spent fuel pools, including a housing;

[0005] The box is equipped with internal pipes, air intake pipes, exhaust pipes and air supply pipes;

[0006] The enclosure is equipped with an air source interface for connecting to an external air source, an exhaust interface for venting air outwards, and an instrument interface for supplying air outwards.

[0007] One end of the air intake pipe is connected to the internal pipe, and the other end is connected to the air source interface;

[0008] One end of the exhaust pipe is connected to the internal pipe, and the other end is connected to the exhaust port;

[0009] One end of the gas supply pipe is connected to the internal pipe, and the other end is connected to the instrument interface;

[0010] It also includes a high-precision pressure gauge connected to the internal pipe for monitoring and displaying the air pressure value in the internal pipe.

[0011] In one embodiment, the air intake pipe is provided with an adjustable valve, which is connected to the air intake pipe between the air source interface and the internal pipe, and is used to regulate the air pressure in the internal pipe.

[0012] In one embodiment, the intake pipe is further provided with a first shut-off valve for controlling the opening and closing of the intake pipe, and a pressure reducing valve for reducing gas pressure.

[0013] The first shut-off valve, the pressure reducing valve, and the regulating valve are sequentially connected to the air inlet pipe between the air source interface and the internal pipe.

[0014] In one embodiment, a fine-tuning valve is provided on the exhaust pipe between the internal pipe and the exhaust port to adjust the exhaust volume of the exhaust pipe.

[0015] In one embodiment, a second shut-off valve for controlling the opening and closing of the exhaust pipe is also provided on the exhaust pipe between the fine-tuning valve and the exhaust port.

[0016] The second shut-off valve and the fine-tuning valve are sequentially connected to the exhaust pipe between the exhaust port and the internal pipe.

[0017] In one embodiment, the air source interface includes a first ferrule interface, the exhaust interface includes a second ferrule interface, and the instrument interface includes a third ferrule interface;

[0018] The first ferrule interface is connected to the external air source via a first ferrule hose;

[0019] The second ferrule interface vents air outward through the second ferrule hose;

[0020] The third ferrule interface supplies air outward through the third ferrule hose.

[0021] In one embodiment, the first ferrule interface, the second ferrule interface, and the third ferrule interface are all 1 / 4 ferrule interfaces, and the first ferrule hose, the second ferrule hose, and the third ferrule hose are all 1 / 4 ferrule hoses.

[0022] In one embodiment, the external air source is an air pump.

[0023] In one embodiment, the level gauge includes a measuring tube for measuring the level of the liquid;

[0024] The third ferrule hose is sealed to the measuring tube.

[0025] In one embodiment, the pressure gauge is disposed inside the housing, which has a transparent viewing window for viewing the pressure gauge readings.

[0026] The implementation of this application has the following beneficial effects: This utility model relates to a pressure regulating device for verifying level gauges in spent fuel pools, comprising a housing, wherein the housing is provided with an internal pipe, an inlet pipe, an outlet pipe, and a supply pipe; the housing is provided with an outlet pipe for connecting to an external air source, an outlet pipe for venting air outwards, and an outlet pipe for supplying air to an instrument; one end of the inlet pipe is connected to the internal pipe, and the other end is connected to the outlet pipe; one end of the outlet pipe is connected to the internal pipe, and the other end is connected to the outlet pipe; one end of the supply pipe is connected to the internal pipe, and the other end is connected to the outlet pipe; the device also includes a high-precision pressure gauge connected to the internal pipe for monitoring and displaying the air pressure value in the internal pipe. The pressure regulating device has significant advantages in terms of precise control, flexible operation, reliable monitoring, and safe operation, and can effectively meet the need to provide stable pressure for verifying level gauges in spent fuel pools. Attached Figure Description

[0027] The present application will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0028] Figure 1 This is a schematic diagram of the gas pressure regulating device used in this application to verify the liquid level gauge in the spent fuel pool;

[0029] Figure 2 This is another structural schematic diagram of the pressure regulating device used in this application for verifying the liquid level gauge in the spent fuel pool.

[0030] The labels are as follows:

[0031] 10. Housing; 11. Internal piping; 12. Air inlet pipe; 13. Exhaust pipe; 14. Air supply pipe; 15. External air source; 16. Air source interface; 17. Exhaust interface; 18. Instrument interface; 19. Pressure gauge; 20. Regulating valve; 21. First shut-off valve; 22. Pressure reducing valve; 23. Fine-tuning valve; 24. Second shut-off valve; 25. Liquid level gauge. Detailed Implementation

[0032] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0033] like Figure 1 As shown, this utility model provides a pressure regulating device for verifying liquid level gauges in spent fuel pools, including a housing 10;

[0034] The housing 10 is equipped with an internal pipe 11, an air inlet pipe 12, an exhaust pipe 13, and an air supply pipe 14.

[0035] The housing 10 is provided with an air source interface 16 for connecting to an external air source 15, an exhaust interface 17 for exhausting air to the outside, and an instrument interface 18 for supplying air to the outside.

[0036] One end of the air intake pipe 12 is connected to the internal pipe 11, and the other end is connected to the air source interface 16;

[0037] One end of the exhaust pipe 13 is connected to the internal pipe 11, and the other end is connected to the exhaust port 17;

[0038] One end of the gas supply pipe 14 is connected to the internal pipe 11, and the other end is connected to the instrument interface 18;

[0039] It also includes a high-precision pressure gauge 19 connected to the internal pipe 11 for monitoring and displaying the air pressure value in the internal pipe 11.

[0040] Understandably, this pressure regulating device connects to the inlet pipe 12, outlet pipe 13, and supply pipe 14 via internal pipe 11 to achieve gas input, output, and pressure regulation. The inlet pipe 12 introduces gas from the gas source interface 16, delivers it through internal pipe 11 to the supply pipe 14, and then provides pressure to the external level gauge 25 via instrument interface 18. When pressure regulation is required, stable pressure output can be achieved by controlling the opening and closing of the inlet and outlet pipes 13, as well as the pressure changes in the internal pipe 11. The pressure gauge 19 monitors and displays the pressure value in the internal pipe 11 in real time, allowing operators to understand and adjust the pressure promptly.

[0041] The pressure regulating device of this application, through reasonable pipeline design and real-time monitoring by pressure gauge 19, can effectively regulate and maintain stable pressure in the internal pipeline 11, thereby providing a reliable pressure environment for the verification of level gauge 25. This stable pressure output helps improve the accuracy of level gauge 25 verification, ensuring its reliability and precision in practical applications, which is of great significance for ensuring the safe operation of spent fuel pools. Furthermore, the device has a relatively simple structure, is easy to operate, maintain, and manage, making it suitable for use in complex environments such as nuclear power plants. Safety factors have been fully considered during the design and operation process to ensure stable operation of the device under various operating conditions, avoiding safety issues caused by pressure fluctuations or equipment failures.

[0042] like Figure 2 As shown, in one embodiment, an adjustable valve 20 with an adjustable opening is provided on the air intake pipe 12. The adjustable valve 20 is connected to the air intake pipe 12 between the air source interface 16 and the internal pipe 11, and is used to adjust the air pressure in the internal pipe 11.

[0043] Understandably, an adjustable regulating valve 20 is installed on the intake pipe 12. This regulating valve 20 is installed on the intake pipe 12 between the air source interface 16 and the internal pipe 11, and its main function is to achieve precise regulation of the air pressure in the internal pipe 11. The working principle of the regulating valve 20 can be based on the throttling principle, controlling the gas flow rate by changing the flow area between the valve core and the valve seat, thereby regulating the air pressure in the internal pipe 11. Specifically, the regulating valve 20 is driven by an actuator (such as pneumatic, electric, or manual control) to move the valve core, changing the relative position between the valve core and the valve seat, thereby achieving control of the gas flow rate.

[0044] In one embodiment, the intake pipe 12 is further provided with a first shut-off valve 21 for controlling the opening and closing of the intake pipe 12, and a pressure reducing valve 22 for reducing gas pressure.

[0045] The first shut-off valve 21, the pressure reducing valve 22, and the regulating valve 20 are sequentially connected to the air inlet pipe 12 between the air source interface 16 and the internal pipe 11.

[0046] In this embodiment, a first shut-off valve 21, a pressure reducing valve 22, and a regulating valve 20 are sequentially arranged on the air intake pipe 12, and they are connected in series between the air source interface 16 and the internal pipe 11. Specifically, the air source interface 16 is connected to the inlet of the first shut-off valve 21, the outlet of the first shut-off valve 21 is connected to the inlet of the pressure reducing valve 22, the outlet of the pressure reducing valve 22 is then connected to the inlet of the regulating valve 20, and the outlet of the regulating valve 20 is finally connected to the internal pipe 11.

[0047] The primary function of the first shut-off valve 21 is to control the opening and closing of the air inlet pipe 12. When it is necessary to stop the air supply or perform equipment maintenance, the first shut-off valve 21 can be closed to cut off the air source and ensure operational safety. The function of the pressure reducing valve 22 is to reduce the pressure of the high-pressure gas from the air source interface 16 to the required low-pressure range to meet the initial pressure requirements of the system. The regulating valve 20 is used to more precisely regulate the pressure of the reduced-pressure gas. By changing the opening of the regulating valve 20, the air pressure in the internal pipe 11 can be flexibly adjusted to achieve the required precise value.

[0048] In actual operation, firstly, the first shut-off valve 21 is opened to connect the gas source with the subsequent pressure reducing valve 22 and regulating valve 20. Then, the gas source pressure is reduced to the required low-pressure range through the pressure reducing valve 22, for example, reducing the gas source pressure from approximately 9 bar to 1 to 2 bar. Next, coarse and fine adjustments are made through the regulating valve 20, and the current pressure is confirmed to meet the requirements based on the display value of the high-precision pressure gauge. Once the pressure meets the requirements, the regulating valve 20 is completely closed, allowing the pressure to remain at the current position. If it is necessary to reduce the internal gas pressure, the pressure relief valve can be opened to release gas and reduce the pressure. Once the pressure reaches the target value, the relief valve is closed to ensure pressure stability.

[0049] In one embodiment, a fine-tuning valve 23 is provided on the exhaust pipe 13 between the internal pipe 11 and the exhaust port 17 for adjusting the exhaust volume of the exhaust pipe.

[0050] In actual operation, when it is necessary to adjust the exhaust volume, the operator can achieve precise control of the exhaust volume through the fine-tuning valve 23.

[0051] In one embodiment, a second shut-off valve 24 for controlling the opening and closing of the exhaust pipe 13 is also provided on the exhaust pipe 13 between the fine-tuning valve 23 and the exhaust port 17.

[0052] The second shut-off valve 24 and the fine-tuning valve 23 are connected in sequence to the exhaust pipe 13 between the exhaust port 17 and the internal pipe 11.

[0053] Understandably, the second shut-off valve 24 controls the opening and closing of the exhaust pipe 13, while the fine-tuning valve 23 can finely adjust the exhaust volume to meet different exhaust needs.

[0054] In one embodiment, the air source interface 16 includes a first ferrule interface, the exhaust interface 17 includes a second ferrule interface, and the instrument interface 18 includes a third ferrule interface.

[0055] The first ferrule interface is connected to the external air source 15 through the first ferrule hose;

[0056] The second ferrule interface vents air outward through the second ferrule hose;

[0057] The third ferrule interface supplies air outward through the third ferrule hose.

[0058] Understandably, in this embodiment, a second shut-off valve 24 and a fine-tuning valve 23 are sequentially installed on the exhaust pipe 13, which is connected by threads to the exhaust port 17 and the internal pipe 11. The main function of the second shut-off valve 24 is to control the opening and closing of the exhaust pipe 13. When it is necessary to stop exhaust or perform equipment maintenance, the second shut-off valve 24 can be closed to cut off the exhaust passage. The fine-tuning valve 23 is used to adjust the exhaust volume of the exhaust pipe.

[0059] In one embodiment, the first ferrule interface, the second ferrule interface, and the third ferrule interface are all 1 / 4 ferrule interfaces, and the first ferrule hose, the second ferrule hose, and the third ferrule hose are all 1 / 4 ferrule hoses.

[0060] Understandably, in this embodiment, the first, second, and third ferrule interfaces all use 1 / 4-inch ferrule interfaces, and the corresponding first, second, and third ferrule hoses are also 1 / 4-inch ferrule hoses. This design ensures standardized and universal connections, facilitates installation and maintenance, and guarantees the system's sealing and reliability. The fit between the ferrule interfaces and the ferrule hoses effectively prevents gas leakage, accommodates certain vibrations and displacements, and ensures connection stability.

[0061] In one embodiment, the external air source 15 is an air pump or a vacuum pump.

[0062] In this embodiment, the external air source 15 can be an air pump or a vacuum pump. The air pump is mainly used to supply compressed air to the internal pipe 11 to increase the air pressure inside the internal pipe 11; while the vacuum pump is used to extract gas from the internal pipe 11 to reduce the air pressure inside the internal pipe 11.

[0063] In one embodiment, the level gauge 25 includes a measuring tube for measuring the level of the liquid.

[0064] The third ferrule hose is sealed to the measuring tube.

[0065] Understandably, this design ensures a tight seal between the level gauge 25 and the third ferrule hose, preventing gas or liquid leakage and thus guaranteeing measurement accuracy and system safety. The flexible connection of the ferrule hose also allows for adaptation to certain vibrations and displacements.

[0066] In one embodiment, the pressure gauge 19 is disposed inside the housing 10, and the housing 10 has a transparent viewing window for viewing the reading of the pressure gauge 19.

[0067] Understandably, the transparent observation window allows operators to check the pressure values ​​at any time without opening the chamber 10.

[0068] In one embodiment, the pressure measurement process includes: a high-precision pressure gauge with an accuracy of 0.05 kPa is installed at the tool's air pressure outlet. Since the accuracy of the instrument being calibrated is ±3%, which translates to a liquid level value of 0.258 m and a pressure value of ±2.5284 kPa, the accuracy of the pressure gauge fully meets the calibration requirements relative to the accuracy of the instrument being measured. The actual liquid level can be quickly set using the current liquid level value and the instrument's calibration target liquid level value.

[0069] In one embodiment, the pressure control process includes: pressure is controlled by a pressure reducing valve 22 and an isolating regulating valve 20. First, the pressure reducing valve 22 reduces the gas source pressure from approximately 9 bar to 1 to 2 bar. Then, the internal gas pressure of the measuring cylinder is adjusted by the coarse and fine regulating valves 20. Based on the display value of a high-precision pressure gauge, it is confirmed whether the current pressure meets the requirements. Once the pressure meets the requirements, the regulating valve 20 is completely closed, and the pressure remains at the current position. If a pressure reduction is needed, the fine-tuning valve 23 can be opened to reduce the internal gas pressure. Once the pressure reaches the target value, the fine-tuning valve 23 is closed to ensure pressure stability. To ensure pressure stability, a stronger sealing valve is added before the regulating valve 20 to meet the pressure stability requirements.

[0070] In one embodiment, the tool's operating process includes: First, closing all internal valves. First, connecting the tool to the air source. The air source compatible with the tool includes an air pump, air cylinder, or an air source with constant pressure. The interface uses a 1 / 4 caliper fitting, and a 1 / 4 caliper tube is used for sealing. Then, connecting the pressure regulating device and the level gauge 25 is completed, again using a 1 / 4 caliper fitting and a 1 / 4 caliper tube for sealing. Opening the high-precision pressure gauge 19, confirming the current reading is correct, and zeroing the gauge to ensure normal display. Adjusting the pressure reducing valve 22 to confirm the output pressure is approximately 1.5 bar. Calculating the target pressure according to the calibration requirements of the level gauge 25, gradually opening the regulating valve 20 according to the target pressure, observing the pressure on the pressure gauge 19. When the pressure reaches or approaches the target pressure, adjusting the fine-tuning valve 23 to gradually reach the target pressure value. After confirming pressure stability, closing the fine-tuning valve 23. When the next pressure setpoint needs to be reached, repeating the above steps to reach the next pressure value. When the instrument needs to reduce pressure, the pressure is adjusted through the discharge line and the fine-tuning valve 23. After the pressure reaches the target value, the fine-tuning valve 23 is closed to maintain pressure stability. The same method is used to accurately set the various pressure values ​​for the level gauge 25.

[0071] Implementing this application has the following beneficial effects:

[0072] Accuracy: Employing high-precision pressure gauges, the liquid level height can be accurately confirmed, and the actual liquid level value can be precisely controlled, providing a reliable and accurate calibration platform for calibration methods using pressure-calibrated heat transfer instruments.

[0073] Speed: The use of various valves, including coarse and fine adjustment valves, to precisely control the pressure ensures the speed of operation and greatly improves work efficiency.

[0074] Simplicity: The tool is designed to be easy to use by adopting the same pipelines and connectors as those used in power plants to connect the calibration tools, instruments and air sources.

[0075] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, free combinations of the above technical features and various modifications and improvements can be made without departing from the concept of the present utility model, and these all fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A pressure regulating device for verifying level gauges in spent fuel pools, comprising a housing, characterized in that, The box is equipped with internal pipes, air intake pipes, exhaust pipes and air supply pipes; The enclosure is equipped with an air source interface for connecting to an external air source, an exhaust interface for venting air outwards, and an instrument interface for supplying air outwards. One end of the air intake pipe is connected to the internal pipe, and the other end is connected to the air source interface; One end of the exhaust pipe is connected to the internal pipe, and the other end is connected to the exhaust port; One end of the gas supply pipe is connected to the internal pipe, and the other end is connected to the instrument interface; It also includes a high-precision pressure gauge connected to the internal pipe for monitoring and displaying the air pressure value in the internal pipe.

2. The pressure regulating device for verifying level gauges in a spent fuel pool according to claim 1, characterized in that, An adjustable valve is provided on the air intake pipe. The adjustable valve is connected to the air intake pipe between the air source interface and the internal pipe and is used to regulate the air pressure in the internal pipe.

3. The pressure regulating device for verifying level gauges in a spent fuel pool according to claim 2, characterized in that, The intake pipe is also equipped with a first shut-off valve for controlling the opening and closing of the intake pipe, and a pressure reducing valve for reducing gas pressure. The first shut-off valve, the pressure reducing valve, and the regulating valve are sequentially connected to the air inlet pipe between the air source interface and the internal pipe.

4. The pressure regulating device for verifying level gauges in a spent fuel pool according to claim 3, characterized in that, A fine-tuning valve is provided on the exhaust pipe between the internal pipe and the exhaust port to adjust the exhaust volume of the exhaust pipe.

5. The pressure regulating device for verifying level gauges in a spent fuel pool according to claim 4, characterized in that, The exhaust pipe between the fine-tuning valve and the exhaust port is also equipped with a second shut-off valve for controlling the opening and closing of the exhaust pipe. The second shut-off valve and the fine-tuning valve are sequentially connected to the exhaust pipe between the exhaust port and the internal pipe.

6. The pressure regulating device for verifying level gauges in a spent fuel pool according to claim 5, characterized in that, The air source interface includes a first ferrule interface, the exhaust interface includes a second ferrule interface, and the instrument interface includes a third ferrule interface; The first ferrule interface is connected to the external air source via a first ferrule hose; The second ferrule interface vents air outward through the second ferrule hose; The third ferrule interface supplies air outward through the third ferrule hose.

7. The pressure regulating device for verifying level gauges in a spent fuel pool according to claim 6, characterized in that, The first, second, and third ferrule interfaces are all 1 / 4 ferrule interfaces, and the first, second, and third ferrule hoses are all 1 / 4 ferrule hoses.

8. The pressure regulating device for verifying level gauges in a spent fuel pool according to claim 7, characterized in that, The external air source is an air pump and / or a vacuum pump.

9. The pressure regulating device for verifying level gauges in a spent fuel pool according to claim 8, characterized in that, The level gauge includes a measuring tube for measuring the level of the liquid. The third ferrule hose is sealed to the measuring tube.

10. The pressure regulating device for verifying level gauges in a spent fuel pool according to claim 9, characterized in that, The pressure gauge is located inside the housing, which has a transparent viewing window for viewing the pressure gauge readings.

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