Connecting device and valve online detection system

Abstract

The utility model belongs to the technical field of valve test equipment, and discloses a connecting device and a valve online detection system. The device is used for being connected with a valve butt-joint pipe and comprises a plugging piece, a first holding clamp and a second holding clamp, the plugging piece can be connected with the valve butt-joint pipe in an inserted mode, a fluid hole communicated with the valve butt-joint pipe is formed in the plugging piece, and the first holding clamp and the second holding clamp can clamp and fix the valve butt-joint pipe; the first holding clamp and / or the second holding clamp are / is detachably connected with the plugging piece, and the first holding clamp is detachably connected with the second holding clamp. According to the utility model, the problems of incapability of online detection, low efficiency, high cost and increase of radioactive media or drainage loss when the sealing performance of the air drain valve is detected in the prior art are solved.

Description

Technical Field

[0001] This utility model relates to the field of valve testing equipment technology, and in particular to a connection device and an online valve testing system. Background Technology

[0002] In the operation of a nuclear power plant, condensate lines play a crucial role. Condensate is the water that condenses from steam due to a drop in pressure and temperature. Flash evaporation often occurs in the condensate lines of nuclear power plants. When the local temperature of the condensate in the condensate line exceeds the corresponding condensate pressure saturation temperature, violent vaporization occurs, forming a two-phase co-flow of steam and water. This flash evaporation causes unstable condensate flow, leading to pipe vibration and erosion. As vibration, wear, and noise are generated due to flash evaporation, if the pressure loss increases or the pressure decreases, some condensate will further vaporize, changing from single-phase flow to two-phase flow. At this point, the fluid velocity will increase dramatically by tens of times or more. This increased velocity, in turn, increases pressure loss and accelerates vaporization, thus exacerbating pipe erosion and potentially causing condensate valve seal failure.

[0003] In critical applications within nuclear power plants, the sealing performance of valves directly impacts the stability and safety of the entire system. Poor sealing can potentially trigger serious safety incidents, such as radioactive material leaks, posing a significant threat to the environment and personnel. Currently, nuclear power plants often use disassembly and inspection of venting steam traps, followed by pressure testing on online test benches to verify their sealing performance. However, this method is inefficient, costly, requires numerous personnel for disassembly and assembly, and the need to vent the medium during operation can lead to increased radioactive material levels or condensate loss. Therefore, to ensure the safe and stable operation of nuclear power plants and avoid serious consequences caused by venting steam trap sealing issues, developing an online device for verifying the sealing performance of venting steam traps is particularly urgent and necessary. This would allow for the early detection and resolution of potential sealing problems without interfering with the normal operation of the nuclear power plant, thereby improving the overall safety and reliability of the system. Utility Model Content

[0004] The purpose of this invention is to provide a connection device and an online valve detection system, which aims to solve the problems of existing technologies that cannot detect the sealing performance of air valves online, are inefficient and costly, and lead to an increase in radioactive media or water loss.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A connecting device for connecting to a valve-to-empty pipe includes a plug, a first clamp, and a second clamp. The plug can be inserted into the valve-to-empty pipe and has a fluid hole communicating with the valve-to-empty pipe. The first clamp and the second clamp can clamp and fix the valve-to-empty pipe. The first clamp and / or the second clamp are detachably connected to the plug and the first clamp is detachably connected to the second clamp.

[0007] As a preferred embodiment of the connection device, it also includes an air nozzle, the sealing member including an end plate and a plug portion, the fluid orifice being disposed on the end plate, the air nozzle being detachably and sealingly connected to the fluid orifice, and the plug portion being sealingly plugged into the valve to the air pipe.

[0008] As a preferred embodiment of the connection device, a sealing element is provided between the plug and the valve empty pipe, and a sealing groove is provided on the plug, with a portion of the sealing element disposed within the sealing groove.

[0009] As a preferred embodiment of the connection device, an anti-slip element is also included, which is disposed between the valve air-to-pipe and the first clamp and the second clamp.

[0010] As a preferred embodiment of the connecting device, the sealing element, the first clamp, the second clamp, and the air nozzle are all made of metal.

[0011] As a preferred embodiment of the connecting device, it further includes a first connecting component and a second connecting component, the second connecting component being detachably connected to the first clamp and the second clamp, and the first connecting component being detachably connected to the sealing member and the first clamp and the second clamp.

[0012] An online valve testing system is provided for connecting to a valve's air-pair pipe to test the valve's sealing performance, including a connection device as described in any of the above embodiments.

[0013] As a preferred option for an online valve monitoring system, it also includes:

[0014] Vacuum pump;

[0015] A connecting pipe that connects the vacuum pump and the connecting device;

[0016] A pressure gauge is installed on this connecting pipe.

[0017] As a preferred embodiment of an online valve monitoring system, a pressure sensor is also included, which is mounted on the connecting pipe and electrically connected to the vacuum pump.

[0018] As a preferred embodiment of an online valve monitoring system, the valve is equipped with a strain monitoring sensor on the empty pipe. The strain monitoring sensor is electrically connected to the vacuum pump and can acquire the strain data of the valve on the empty pipe and transmit it to the vacuum pump.

[0019] Beneficial effects:

[0020] This utility model provides a connection device and an online valve testing system for connecting to a valve's air gap pipe to test the valve's sealing performance. The connection device includes a plugging component, a first clamp, and a second clamp. The plugging component can be inserted into the valve's air gap pipe and has a fluid hole communicating with the valve's air gap pipe. The first clamp and the second clamp are clamped and fixed to the air gap pipe of the steam trap. The plugging component is detachably connected to the first clamp and / or the second clamp. The connection device can be quickly connected to the port of the valve's air gap pipe without disassembling the valve, allowing for the connection of a sealing performance testing device to the valve's air gap pipe. This utility model solves the problems of existing technologies that cannot perform online testing of the sealing performance of steam traps, are inefficient and costly, and lead to an increase in radioactive media or water loss. This device is simple in design and easy to operate on-site. Attached Figure Description

[0021] Fig. 1 This is an isometric drawing of a connecting device according to this utility model;

[0022] Fig. 2 This is an exploded view of a connecting device according to this utility model;

[0023] Fig. 3 This is a schematic diagram of an online valve detection system according to this utility model.

[0024] In the picture:

[0025] 1. Valve to empty pipe; 21. Sealing component; 211. End plate; 212. Insertion part; 22. First clamp; 23. Second clamp; 24. Air nozzle; 25. Sealing component; 26. Anti-slip component; 27. First connecting assembly; 28. Second connecting assembly; 3. Valve; 4. Vacuum pump; 5. Connecting pipe; 6. Pressure gauge; 7. Pressure sensor. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0030] like Figs. 1-3As shown, this embodiment provides a connecting device for connecting to the valve's empty pipe 1, thereby allowing online testing of the valve 3's sealing performance without disassembling the valve 3. The connecting assembly includes a plugging component 41, a first clamp 22, a second clamp 23, a first connecting component 27, and a second connecting component 28. The plugging component 41 includes an end plate 211 and a plug-in portion 212, which is sealed and plugged into the valve's empty pipe 1. The end plate 211 has a fluid hole communicating with the drain valve's empty pipe 1. The first clamp 22 and the second clamp 23 can clamp and fix the valve's empty pipe 1. The second connecting component 28 holds the first clamp 22... The first connecting component 27 detachably connects the sealing element 21 to the first clamp 22 and the second clamp 23. Both the first connecting component 27 and the second connecting component 28 include bolts and nuts. The first clamp 22 and the second clamp 23 facilitate quick installation and removal on the valve empty pipe 1. The first clamp 22 and the second clamp 23 are fixed on the valve empty pipe 1 by the second connecting component 28, and the sealing element 21 is fixedly connected to the first clamp 22 and the second clamp 23 by the first connecting component 27, so that the sealing element 21 can be securely inserted into the valve empty pipe 1 and will not fall off.

[0031] Preferably, to facilitate the quick connection and disassembly of the sealing plug 21 for sealing performance testing, the connection assembly also includes an air nozzle 24. The air nozzle 24 is detachably and sealed in the sealing fluid hole. The air nozzle 24 adopts a quick-connect structure, such as a sealing connection method in which the inner conical surface and the outer conical surface cooperate, which can achieve a tight and reliable connection with the sealing performance testing equipment in a very short time, effectively improving the ease of operation and work efficiency of the entire test device.

[0032] Preferably, a sealing element 25 is provided between the insertion part 212 and the drain valve empty pipe 1. The sealing element 25 is made of rubber, and a sealing groove is provided on the insertion part 212. Part of the sealing element 25 is disposed in the sealing groove. The sealing element 25 is an O-ring rubber seal. The O-ring rubber seal can be tightly embedded in the sealing groove and form an effective sealing interface when under pressure. This allows the insertion part 212 of the plugging element 21 to be inserted more tightly into the drain valve empty pipe 1. Under different temperature and pressure conditions, the O-ring rubber seal can always maintain good elastic deformation ability, effectively fill the sealing gap, prevent gas leakage, provide a reliable defense for the sealing of the entire test device, and improve the accuracy of sealing performance testing.

[0033] Preferably, the connecting assembly further includes an anti-slip component 26, which is also made of rubber. The anti-slip component 26 is disposed between the valve empty pipe 1 and the first clamp 22 and the second clamp 23. The anti-slip component 26 is a rubber bushing made of a soft and elastic rubber material, such as nitrile rubber, fluororubber, or silicone rubber. The inner diameter of the anti-slip component 26 is slightly smaller than the outer diameter of the valve empty pipe 1, so that it can be tightly fitted onto the valve empty pipe 1 during installation, providing good cushioning and protection. The outer surface of the anti-slip component 26 is in close contact with the inner surfaces of the first clamp 22 and the second clamp 23, and its elastic deformation evenly disperses the pressure between the first clamp 22 and the second clamp 23. The clamping force applied by the second clamp 23 prevents the first clamp 22 and the second clamp 23 from directly and rigidly contacting the valve empty pipe 1, thus avoiding surface scratches or local stress concentration on the valve empty pipe 1. At the same time, the anti-slip component 26 also has a certain sealing auxiliary function, further enhancing the overall sealing performance of the connection. In addition, the sealing component 21 is detachably connected to the first clamp 22 and the second clamp 23 through the first connecting assembly 27. The anti-slip component 26 also prevents the first clamp 22 and the second clamp 23 from falling off the valve empty pipe 1, thereby preventing the sealing component 21 from falling off the valve empty pipe 1, further improving the sealing performance and reliability of the connection.

[0034] Preferably, the sealing component 21, the first clamp 22, the second clamp 23, and the air nozzle 24 are all metal parts, which can be made of stainless steel or alloy steel, so that the metal parts have good corrosion resistance and mechanical strength, and can also withstand high temperature.

[0035] Preferably, the valve online detection system provided in this embodiment also includes a pressure sensor 7. The pressure sensor 7 is installed on the connecting pipe 5 and electrically connected to the vacuum pump 3. A tight interlock control loop is constructed between the vacuum pump 3 and the pressure sensor 7. Throughout the detection cycle, the pressure sensor 7 continuously monitors the pressure changes inside the connecting pipe 5 at an extremely high sampling frequency and transmits the real-time data to the vacuum pump 3. With the help of the pressure signal fed back in real time by the pressure sensor 7, the vacuum pump 3 is dynamically controlled, effectively ensuring that the vacuum degree between the connecting pipe 5 and the drain valve in the empty pipe 1 is always within the preset range, providing stable and reliable differential pressure conditions for the sealing performance detection of the drain valve 2. The vacuum pump 3 performs complex logical calculations and control decisions based on these data, such as immediately stopping the vacuum pump when the pressure reaches the preset test vacuum pressure, and providing timely warnings and handling for abnormal pressure fluctuations during the pressure holding stage, thereby ensuring high accuracy and high reliability of the detection process.

[0036] This embodiment also discloses an online valve testing system for connecting to the valve's air gap pipe 1 to test the sealing performance of valve 3. The online valve testing system includes a vacuum pump 4, a connecting pipe 5, a pressure gauge 6, and connecting components as described in any of the above embodiments. The vacuum pump 4 is the core control component of the entire online valve testing system, playing a crucial role in precisely controlling the vacuum level in the valve's air gap pipe 1. Operators can set parameters such as the target vacuum pressure and holding time through the vacuum pump 4. The connecting pipe 5 connects the vacuum pump 4 to the connecting device. The vacuum pump 4 is connected to the air nozzle 24 of the sealing component 21 of the connecting device. The connection part of the connecting pipe 5 is welded or uses high-precision threads. The connection method ensures a firm and reliable seal, enabling stable fluid transmission under different pressure and temperature conditions. This provides a reliable fluid channel for the entire valve online monitoring system. Pressure gauge 6 is installed on the connecting pipe 5. Through a combination of a high-precision pressure sensor and a mechanical gauge head, pressure gauge 6 displays the vacuum pressure value inside the connecting pipe 5 on the dial in the form of pointer scale. During the vacuuming process of the valve-to-empty pipe 1, pressure gauge 6 tracks the pressure change in real time. Once the pressure in the valve-to-empty pipe 1 and the connecting pipe 5 reaches the set test vacuum pressure, the vacuum pump 4 is stopped. After the pressure holding time is over, the scale change of pressure gauge 6 is observed to determine whether there is a leak in valve 3.

[0037] Preferably, a strain monitoring sensor is also installed on the valve-to-empty pipe 1. The strain monitoring sensor is electrically connected to the vacuum pump 4. The strain monitoring sensor can acquire the strain data of the valve-to-empty pipe 1 and transmit it to the vacuum pump 4. The strain monitoring sensor adopts a high-precision strain gauge sensor, which is firmly attached to the outer wall surface of the pipe through a special bonding process and electrically connected to the vacuum pump. During the vacuuming process, as the pressure difference between the inside and outside of the valve-to-empty pipe 1 gradually increases, the valve-to-empty pipe 1 will generate corresponding stress and strain changes. With its high-sensitivity strain gauge, the strain monitoring sensor can accurately sense the small deformation of the pipe and convert this mechanical deformation into an electrical signal output. These electrical signals are transmitted to the vacuum pump 4 in real time through a cable. Its built-in signal processing unit performs a series of processing operations such as amplification, filtering, and analog-to-digital conversion on the electrical signals and compares them with the preset safety threshold. Once the strain data exceeds the set safety threshold, the vacuum control cabinet immediately triggers an alarm signal and automatically stops the vacuuming operation to prevent the pipe from being damaged due to excessive deformation. In this way, the strain monitoring sensor provides real-time pipe stress monitoring and safety protection functions for the entire test device, effectively improving the safety and reliability of the device.

[0038] This utility model provides the following installation steps for a connection device and an online valve detection system:

[0039] Install the air nozzle 24 into the fluid hole of the sealing component 21. During installation, pay attention to the installation direction and verticality of the air nozzle 24 to ensure that the air nozzle 24 does not deviate or twist, thereby affecting the air tightness of the air nozzle 24.

[0040] Install the anti-slip component 26 on the valve's empty pipe 1, ensuring it is the right size and makes good contact. Then, install the sealing component 25 into the sealing groove of the insertion part 212 of the plugging component 21. Finally, insert the plugging component 21 into the valve's empty pipe 1, ensuring that the sealing component 25 provides a good seal.

[0041] The first clamp 22 and the second clamp 23 are tightly installed on the outer surface of the anti-slip component 26 by bolts to ensure that the first clamp 22 and the second clamp 23 fit well with the anti-slip component 26.

[0042] The sealing component 21 is fastened to the first clamp 22 and the second clamp 23 by bolts.

[0043] The vacuum pump 4 is connected to the air nozzle 24 through the connecting pipe 5, and a pressure gauge 6 and a pressure sensor 7 are installed on the connecting pipe 5, and the pressure sensor 7 is electrically connected to the vacuum pump 4.

[0044] The strain monitoring sensor is installed on the air-to-drain pipe 1 of the drain valve and electrically connected to the vacuum pump 4.

[0045] Vacuum pump 4 evacuates air from the valve's empty pipe 1 and connecting pipe 5. Once the set test vacuum pressure is reached, vacuum pump 4 is paused, and the pressure holding phase begins. A pressure gauge 6 and a pressure sensor 7, installed on connecting pipe 5, indicate the real-time vacuum pressure and are interlocked for control. During the pressure holding period, pressure sensor 7 continuously monitors pressure changes. If the pressure remains stable and fluctuates within the allowable error range, it indicates that valve 3 has good sealing performance. If there are abnormal changes such as a significant increase or decrease in pressure, valve 3 may be leaking. After the pressure holding time is completed, personnel observe the vacuum pressure changes on pressure gauge 6 and, combined with the data recorded by pressure sensor 7, determine whether the valve is leaking.

[0046] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A connecting device for connecting to a valve-to-air pipe (1), characterized in that, The device includes a plug (21), a first clamp (22), and a second clamp (23). The plug (21) can be inserted into the valve air-push pipe (1), and the plug (21) is provided with a fluid hole communicating with the valve air-push pipe (1). The first clamp (22) and the second clamp (23) can clamp and fix the valve air-push pipe (1). The first clamp (22) and / or the second clamp (23) are detachably connected to the plug (21).

2. The connecting device according to claim 1, characterized in that, It also includes an air nozzle (24), the sealing member (21) includes an end plate (211) and a plug (212), the fluid hole is disposed on the end plate (211), the air nozzle (24) is detachably and sealedly connected to the fluid hole, and the plug (212) is sealedly plugged into the valve air pipe (1).

3. The connecting device according to claim 2, characterized in that, A sealing element (25) is provided between the plug part (212) and the valve air pipe (1), and a sealing groove is provided on the plug part (212), with part of the sealing element (25) disposed in the sealing groove.

4. The connecting device according to claim 1, characterized in that, It also includes an anti-slip component (26), which is disposed between the valve air-to-air pipe (1) and the first clamp (22) and the second clamp (23).

5. The connecting device according to claim 2, characterized in that, The sealing component (21), the first clamp (22), the second clamp (23), and the air nozzle (24) are all made of metal.

6. The connecting device according to claim 1, characterized in that, It also includes a first connecting component (27) and a second connecting component (28), the second connecting component (28) detachably connecting the first clamp (22) and the second clamp (23), and the first connecting component (27) detachably connecting the sealing member (21) to the first clamp (22) and the second clamp (23).

7. A valve online testing system for connecting to a valve relief pipe (1) to test the sealing performance of the valve (3), characterized in that, Includes the connecting device as described in any one of claims 1-6.

8. The valve online detection system according to claim 7, characterized in that, Also includes: Vacuum pump (4); Connecting pipe (5), the connecting pipe (5) connects the vacuum pump (4) and the connecting device; A pressure gauge (6) is installed on the connecting pipe (5).

9. The valve online detection system according to claim 8, characterized in that, It also includes a pressure sensor (7), which is disposed on the connecting pipe (5) and electrically connected to the vacuum pump (4).

10. The valve online detection system according to claim 8, characterized in that, A strain monitoring sensor is installed on the valve-to-air pipe (1). The strain monitoring sensor is electrically connected to the vacuum pump (4). The strain monitoring sensor can acquire the strain data of the valve-to-air pipe (1) and transmit it to the vacuum pump (4).

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