Nuclear power plant valve air leakage detection device

Abstract

The utility model provides a nuclear power plant valve air leakage detection device. The nuclear power plant valve air leakage detection device comprises a first half cylinder and a second half cylinder; first sealing pieces and sealing grooves are arranged on the inner walls of the two ends of the first half cylinder, the first half cylinder is provided with a first detection cavity, and a first gas detection sensor is arranged in the first detection cavity; the second half cylinder is detachably connected to the first half cylinder, a second sealing piece and a third sealing piece are arranged on the inner walls of the two ends of the second half cylinder, the second half cylinder is provided with a second detection cavity, and a second gas detection sensor is arranged in the second detection cavity. According to the utility model, the first sealing element, the second sealing element, the sealing groove and the third sealing element are arranged, so that the first half cylinder and the second half cylinder are connected with the pipeline assembly in a sealing manner, and a closed valve detection environment can be formed; the first gas detection sensor and the second gas detection sensor are arranged in the first detection cavity and the second detection cavity, so that the change of gas flow of the valve and near the valve can be detected in real time at a short distance, and the sensitivity and timeliness of gas leakage detection are improved.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power plant safety protection technology, and more specifically to a valve leakage detection device for nuclear power plants. Background Technology

[0002] Ensuring valve sealing is crucial during nuclear power plant operations. Valves leaking can disrupt normal production processes and pose a serious threat to the safety of nuclear facilities. Currently, nuclear power plants primarily use algorithmic software to detect and identify valve status in video feeds. This method can issue alarms when a leak is detected in a designated area of ​​the video feed. However, due to limitations such as detection distance and the amount of gas leaked, video detection methods typically have significant delays, making it difficult to detect valve leaks promptly. This delay can lead to undetected and unaddressed potential safety hazards, potentially causing serious consequences. For example, leaked gas spreading within the nuclear power plant can increase the risk of radiation exposure for workers, and in severe cases, could even trigger a radiation accident. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a valve leakage detection device for nuclear power plants to solve the technical problem of untimely feedback of leakage detection by video in nuclear power plants.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides a valve leakage detection device for nuclear power plants, applied to valves and pipeline assemblies connected to valves. The valve leakage detection device includes: a first half-cylinder and a second half-cylinder; the inner walls of both ends of the first half-cylinder are provided with a first sealing element and a sealing groove, the first sealing element is arranged radially along the first half-cylinder, and the sealing groove is arranged axially along the first half-cylinder; the first half-cylinder is provided with a first detection chamber, and a first gas detection sensor is provided in the first detection chamber; the second half-cylinder is detachably connected to the first half-cylinder, and the first half-cylinder and the second half-cylinder are used for sealing connection with the pipeline assembly; the inner walls of both ends of the second half-cylinder are provided with a second sealing element and a third sealing element, the second sealing element is arranged radially along the second half-cylinder, and the third sealing element is arranged axially along the second half-cylinder, and the sealing groove is used to accommodate the third sealing element; the second half-cylinder is provided with a second detection chamber, the first detection chamber and the second detection chamber are used to cover the valve, and a second gas detection sensor is provided in the second detection chamber.

[0006] The number of the first sealing elements is at least two, and the at least two sealing elements are linearly distributed along the axial direction of the first half-cylinder.

[0007] The number of the second seal is the same as the number of the first seal.

[0008] The sealing groove is located between the first sealing element and the first detection cavity.

[0009] The third sealing element is disposed between the second sealing element and the second detection cavity.

[0010] The first half-cylinder has two first connecting parts, which are arranged along the axial direction of the first half-cylinder and extend outward from the two side edges of the first half-cylinder respectively. The sealing groove is provided on the first connecting part.

[0011] The second half-cylinder is provided with a second connecting part corresponding to the first connecting part, and the third sealing element is provided on the second connecting part.

[0012] The first connecting part and the second connecting part are also provided with screw holes, and a screw connector is inserted into the screw holes.

[0013] The first detection cavity is provided with an observation window, which is transparent.

[0014] The first detection chamber is equipped with a vacuum suction port.

[0015] The advantages of this invention compared to existing technologies are as follows: By incorporating a first and second sealing element, this invention achieves a sealed connection between the first and second half-cylinders and the pipeline assembly. Combined with the sealing groove and third sealing element, it enhances the tightness of the fit between the first and second half-cylinders, creating a sealed detection environment for accurate valve leakage detection. Furthermore, by placing the first and second gas detection sensors within the first and second detection chambers, these sensors can detect changes in airflow around the valve in real-time and at close range, significantly improving the sensitivity and timeliness of leakage detection. Once a leak is detected, the leak information can be quickly captured and reported, effectively mitigating various safety hazards caused by detection delays and strongly ensuring the safe and stable operation of nuclear power plants.

[0016] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of this utility model more obvious and understandable, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0017] Figure 1A schematic diagram of the overall structure of the nuclear power plant valve leakage detection device provided by this utility model;

[0018] Figure 2 A side view of the nuclear power plant valve leakage detection device provided by this utility model;

[0019] Figure 3 for Figure 2 A schematic diagram of the AA cross-sectional structure;

[0020] Figure 4 A front view structural schematic diagram of the nuclear power plant valve leakage detection device provided by this utility model;

[0021] Figure 5 for Figure 4 A schematic diagram of the BB cross-sectional structure;

[0022] Figure 6 A schematic diagram illustrating the application scenario of the nuclear power plant valve leakage detection device provided by this utility model.

[0023] Figure label:

[0024] 1. First half-cylinder; 11. First sealing element; 12. Sealing groove; 13. First detection chamber; 131. Vacuum suction hole; 14. First gas detection sensor; 15. First connecting part; 151. Screw hole; 2. Second half-cylinder; 21. Second sealing element; 22. Third sealing element; 23. Second detection chamber; 24. Second gas detection sensor; 25. Second connecting part; 3. Valve; 4. Pipeline assembly. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] It should be understood that, when used in this specification and the appended claims, the terms “comprising” and “including” indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0027] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0028] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0029] See Figure 1-6 As shown, this embodiment discloses a valve leakage detection device for nuclear power plants, applied to valve 3 and the pipeline assembly 4 connected to valve 3. Specifically, see... Figure 6 As shown, valve 3 is connected between two pipe assemblies 4 and is used to control the flow of gas in the two pipe assemblies 4. In this embodiment, the nuclear power plant valve leakage detection device is covered and sealed to the two pipe assemblies 4 and wraps around valve 3 to provide a closed operating environment for valve 3, so as to detect the airflow in and around valve 3 and thus determine whether valve 3 has a leakage.

[0030] Specifically, the nuclear power plant valve leakage detection device of this embodiment includes: a first half-cylinder 1 and a second half-cylinder 2; the inner walls of both ends of the first half-cylinder 1 are provided with a first sealing element 11 and a sealing groove 12, the first sealing element 11 is arranged radially along the first half-cylinder 1, and the sealing groove 12 is arranged axially along the first half-cylinder 1; the first half-cylinder 1 is provided with a first detection chamber 13, and a first gas detection sensor 14 is provided in the first detection chamber 13; the second half-cylinder 2 is detachably connected to the first half-cylinder 1, and the first half-cylinder 1 and the second half-cylinder 2 are used for sealing connection with the pipeline assembly 4; the inner walls of both ends of the second half-cylinder 2 are provided with a second sealing element 21 and a third sealing element 22, the second sealing element 21 is arranged radially along the second half-cylinder 2, and the third sealing element 22 is arranged axially along the second half-cylinder 2, and the sealing groove 12 is used to accommodate the third sealing element 22; the second half-cylinder 2 is provided with a second detection chamber 23, the first detection chamber 13 and the second detection chamber 23 are used to cover the valve 3, and a second gas detection sensor 24 is provided in the second detection chamber 23.

[0031] In practice, first ensure that valve 3 is connected to pipeline assembly 4. Then, place the first half-cylinder 1 and the second half-cylinder 2 against pipeline assembly 4 from both sides, so that the first detection chamber 13 and the second detection chamber 23 are aligned with valve 3 and cover valve 3 and the connection between valve 3 and pipeline assembly 4. The first sealing element 11 and the second sealing element 21 are pressed against the outer wall of pipeline assembly 4, and the third sealing element 22 is inserted into the sealing groove 12. Then, fix the first half-cylinder 1 and the second half-cylinder 2 together, thus completing the installation of the nuclear power plant valve leakage detection device.

[0032] The nuclear power plant valve leakage detection device of this embodiment adopts a detachable first half-cylinder 1 and second half-cylinder 2 design, which greatly improves the ease of installation and disassembly of the device. Operators can easily complete related operations without pre-installing the detection device before connecting the pipeline assembly 4 and the valve 3, significantly reducing the installation difficulty of the detection device and significantly improving operational efficiency. The first sealing element 11 and the second sealing element 21 achieve a sealed connection between the first half-cylinder 1 and the second half-cylinder 2 and the pipeline assembly 4. Combined with the sealing groove 12 and the third sealing element 22, the tightness of the fit between the first half-cylinder 1 and the second half-cylinder 2 is improved, making the first half-cylinder 1... A sealed detection environment is formed inside cylinder 1 and the second half-cylinder 2 to facilitate accurate leakage detection of valve 3. The first gas detection sensor 14 and the second gas detection sensor 24 are set inside the first detection chamber 13 and the second detection chamber 23, so that the first gas detection sensor 14 and the second gas detection sensor 24 can detect the changes in airflow in and around valve 3 in real time at close range. This greatly improves the sensitivity and timeliness of leakage detection. Once there are signs of leakage in valve 3, the leakage information can be quickly captured and fed back, effectively avoiding various safety hazards caused by detection delays and strongly ensuring the safe and stable operation of the nuclear power plant.

[0033] In this embodiment, the sides of the first half-cylinder 1 and the second half-cylinder 2 that are relatively close to each other are both provided with semi-circular grooves, which are adapted to the shape of the pipe assembly 4. The semi-circular groove design that adapts to the shape of the pipe assembly 4 allows the first half-cylinder 1 and the second half-cylinder 2 to fit tightly against the pipe assembly 4, enhancing the stability of the connection between the detection device and the pipe assembly 4, ensuring that the detection device will not loosen due to the shape of the pipe during the detection process, thereby improving the accuracy of the detection and ensuring the airtightness of the entire detection environment.

[0034] In this embodiment, the first sealing element 11, the second sealing element 21, and the third sealing element 22 are all sealing strips. The sealing strips have good elasticity and sealing performance, and can effectively fill the gaps between the first half-cylinder 1, the second half-cylinder 2 and the pipe assembly 4, as well as the gap between the first half-cylinder 1 and the second half-cylinder 2, providing a reliable sealed environment for valve 3 detection; the use of sealing strips has a lower cost, which can reduce the production and maintenance costs of the entire detection device.

[0035] Specifically, there are at least two first sealing elements 11, which are linearly distributed along the axial direction of the first half-cylinder 1. This linear axial distribution of multiple first sealing elements 11 forms a multi-layered sealing barrier at the connection between the first half-cylinder 1 and the pipe assembly 4, further enhancing the sealing effect. Even if one first sealing element 11 is slightly damaged or fails to seal properly, the other first sealing elements 11 can still continue to function, ensuring that the overall sealing performance is not significantly affected. This improves the reliability and stability of the device and effectively prevents inaccurate test results due to air leakage at the connection between the first half-cylinder 1 and the pipe assembly 4.

[0036] Specifically, the number of second seals 21 is the same as the number of first seals 11. Maintaining the same number of second seals 21 and first seals 11 ensures that the sealing capacity of both halves of the first half-cylinder 1 and the second half-cylinder 2 is balanced when connected to the pipe assembly 4, providing a stable and reliable sealing environment for the detection device. This ensures that throughout the entire detection process, regardless of pressure changes within the pipe assembly 4, the connection between the device and the pipe assembly 4 maintains good sealing, preventing leakage due to weak sealing on one side, thus guaranteeing the accuracy of leak detection of valve 3.

[0037] Specifically, the sealing groove 12 is located between the first sealing element 11 and the first detection chamber 13. The first half-cylinder 1 consists of the first sealing element 11, the sealing groove 12, and the first detection chamber 13 from the outermost end to the middle. When the first half-cylinder 1 and the second half-cylinder 2 are respectively attached to the pipe assembly 4, the first half-cylinder 1 and the second half-cylinder 2 also approach each other and fit tightly, so that the third sealing element 22 is inserted into the sealing groove 12, which enhances the sealing effect between the first half-cylinder 1 and the second half-cylinder 2, and provides a more reliable sealed space for the first detection chamber 13 and the second detection chamber 23, which is conducive to improving the accuracy of valve 3 leakage detection.

[0038] Specifically, the third seal 22 is located between the second seal 21 and the second detection chamber 23. In this position, the third seal 22 can tightly fit with the sealing groove 12 on the first half-cylinder 1, enhancing the sealing of the connection between the first half-cylinder 1 and the second half-cylinder 2, and preventing gas exchange between the detection chamber and the outside environment through the connection. Simultaneously, the third seal 22 and the second seal 21 work together to create a good sealing environment for the second detection chamber 23, ensuring that the second gas detection sensor 24 is not affected by external factors, accurately detecting gas changes near the valve 3, and improving the sensitivity and reliability of leak detection.

[0039] Specifically, the first half-cylinder 1 is provided with two first connecting portions 15, which are arranged axially along the first half-cylinder 1 and extend outward from both sides of the first half-cylinder 1. A sealing groove 12 is provided on the first connecting portions 15. The protruding arrangement of the first connecting portions 15 provides a structural basis for the connection between the first half-cylinder 1 and the second half-cylinder 2, facilitating the fixation of the first half-cylinder 1 and the second half-cylinder 2. Simultaneously, the symmetrical and axially arranged two first connecting portions 15 ensure a uniform distribution of the connecting force, improving the structural stability of the first half-cylinder 1 and the connection stability between the first half-cylinder 1 and the second half-cylinder 2, thus guaranteeing the continuous sealing of the detection device during use.

[0040] Specifically, the second half-cylinder 2 is provided with a second connecting portion 25 corresponding to the first connecting portion 15, and a third sealing element 22 is disposed on the second connecting portion 25. The third sealing element 22, disposed on the second connecting portion 25, perfectly matches the sealing groove 12 on the first connecting portion 15, effectively preventing gas leakage at the connection between the first half-cylinder 1 and the second half-cylinder 2, further improving the sealing performance of the detection device. The second connecting portion 25, corresponding to the first connecting portion 15, allows the first half-cylinder 1 and the second half-cylinder 2 to be precisely aligned and tightly connected, facilitating the assembly and disassembly of the detection device, improving operational efficiency, and ensuring the airtightness of the detection environment.

[0041] Specifically, the first connecting part 15 and the second connecting part 25 are also provided with screw holes 151, and a screw connector (not shown) passes through the screw holes 151. In this embodiment, the screw connector is a bolt. The screw holes 151 and the screw connector cooperate to provide a simple and reliable fixing method for connecting the first half-cylinder 1 and the second half-cylinder 2. By tightening the screw connector, the first connecting part 15 and the second connecting part 25 can be tightly connected together, thereby ensuring a stable connection between the first half-cylinder 1 and the second half-cylinder 2. The screw connector is screwed into the screw holes 151, which facilitates the adjustment and disassembly of the first half-cylinder 1 and the second half-cylinder 2. When it is necessary to maintain the detection device or replace parts, the operator can easily disassemble it, improving the maintainability of the device. At the same time, it also ensures the firmness of the connection between the first half-cylinder 1 and the second half-cylinder 2 during normal use and maintains the airtightness of the detection environment.

[0042] It is understood that in other embodiments, snap-fit ​​and slot can be used instead of screws and screw holes 151, that is, the first connecting part 15 and the second connecting part 25 are connected by snap-fit ​​to achieve a tight connection between the first half cylinder 1 and the second half cylinder 2.

[0043] Specifically, the first detection chamber 13 is equipped with an observation window (not shown), which is transparent. This transparent observation window allows operators to directly observe the conditions inside the first detection chamber 13, such as whether foreign objects have entered the chamber, and to check the working status of valve 3 and / or the first gas detection sensor 14. During operation of the detection device, abnormalities can be detected promptly through the observation window, facilitating timely implementation of appropriate measures. This improves the monitorability and maintenance convenience of the detection device. Furthermore, before testing, the cleanliness of the detection chamber can be checked through the observation window to ensure the testing environment meets requirements, thereby improving the accuracy of the test results.

[0044] Specifically, the first detection chamber 13 is provided with a vacuum suction port 131. More specifically, the inner diameter of the first detection chamber 13 is larger than the inner diameter of the first semi-cylinder 1, and the inner diameter of the second detection chamber 23 is larger than the inner diameter of the second semi-cylinder 2. When the first detection chamber 13 and the second detection chamber 23 are covered outside the valve 3, the first detection chamber 13 and the second detection chamber 23 are interconnected. The vacuum suction port 131 facilitates the extraction of air from the first detection chamber 13 and the second detection chamber 23 before detection by connecting a vacuum pump and related equipment, forming a vacuum environment. This allows the first gas detection sensor 14 and the second gas detection sensor 24 to sensitively detect pressure changes when the valve 3 is leaking. Alternatively, the vacuum environment can reduce the interference of the original gas in the first detection chamber 13 and the second detection chamber 23 on the detection results, enabling the first gas detection sensor 14 and the second gas detection sensor 24 to more accurately detect the concentration of gas leaking from the valve 3, thereby improving the reliability of the detection results.

[0045] In this embodiment, the first gas detection sensor 14 and the second gas detection sensor 24 are pressure detection sensors or gas concentration sensors. By detecting changes in gas pressure or concentration of a specified gas in the first detection chamber 13 and the second detection chamber 23, the leakage status of valve 3 is determined.

[0046] The nuclear power plant valve leakage detection device of this embodiment achieves a sealed connection between the first and second half-cylinders and the pipeline assembly through the setting of the first and second sealing elements. Combined with the setting of the sealing groove and the third sealing element, the tightness of the fit between the first and second half-cylinders is improved, so that a closed detection environment is formed inside the first and second half-cylinders, which facilitates accurate leakage detection of the valve. The first gas detection sensor and the second gas detection sensor are set in the first detection chamber and the second detection chamber, so that the first gas detection sensor and the second gas detection sensor can detect the changes in airflow in and around the valve at close range in real time, which greatly improves the sensitivity and timeliness of leakage detection. Once the valve shows signs of leakage, the leakage information can be quickly captured and fed back, effectively avoiding various safety hazards caused by detection delays and strongly ensuring the safe and stable operation of the nuclear power plant.

[0047] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. A valve leakage detection device for nuclear power plants, applied to valves and pipe assemblies connected to valves, characterized in that, include: The first half-cylinder has a first sealing element and a sealing groove on the inner wall at both ends. The first sealing element is arranged radially along the first half-cylinder, and the sealing groove is arranged axially along the first half-cylinder. The first half-cylinder has a first detection chamber, and a first gas detection sensor is provided in the first detection chamber. The second half-cylinder is detachably connected to the first half-cylinder. The first and second half-cylinders are used for a sealed connection with the pipeline assembly. The inner walls at both ends of the second half-cylinder are provided with a second sealing element and a third sealing element. The second sealing element is arranged radially along the second half-cylinder, and the third sealing element is arranged axially along the second half-cylinder. The sealing groove is used to accommodate the third sealing element. The second half-cylinder is provided with a second detection chamber. The first and second detection chambers are used to cover the valve. A second gas detection sensor is provided inside the second detection chamber.

2. The nuclear power plant valve leakage detection device according to claim 1, characterized in that, The number of the first seal is at least two, and the at least two seals are linearly distributed along the axial direction of the first half-cylinder.

3. The nuclear power plant valve leakage detection device according to claim 2, characterized in that, The number of the second seal is the same as the number of the first seal.

4. The nuclear power plant valve leakage detection device according to claim 1, characterized in that, The sealing groove is located between the first sealing element and the first detection cavity.

5. The nuclear power plant valve leakage detection device according to claim 4, characterized in that, The third sealing element is disposed between the second sealing element and the second detection cavity.

6. The nuclear power plant valve leakage detection device according to claim 1, characterized in that, The first half-cylinder has two first connecting parts, which are arranged along the axial direction of the first half-cylinder, and the two first connecting parts extend outward from the two side edges of the first half-cylinder respectively. The sealing groove is provided on the first connecting part.

7. The nuclear power plant valve leakage detection device according to claim 6, characterized in that, The second half-cylinder is provided with a second connecting part corresponding to the first connecting part, and the third sealing element is provided on the second connecting part.

8. The nuclear power plant valve leakage detection device according to claim 7, characterized in that, The first connecting part and the second connecting part are also provided with screw holes, and a screw connector is inserted into the screw holes.

9. The nuclear power plant valve leakage detection device according to claim 1, characterized in that, The first detection cavity is provided with an observation window, which is transparent.

10. The nuclear power plant valve leakage detection device according to claim 1, characterized in that, The first detection chamber is equipped with a vacuum suction port.

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