A bottom shield for detecting leakage of a thyristor converter valve

Abstract

The utility model belongs to thyristor converter valve detection field discloses a kind of bottom shielding for thyristor converter valve water leakage detection, including the shielding cover being fixed in valve tower bottom, inside installation V-shaped water collecting tray, water collecting tray middle part is U-shaped groove, drainage pipe is vertically inserted in groove, and water leakage detection device is set below drainage pipe entrance. V-shaped structure can efficiently gather leaked cooling water to U-shaped groove center point, rather than the linear water collection mode of traditional inclined cover, avoids water volume accumulation delay;Drainage pipe can avoid that leaked water is gathered too much in shielding cover, causes equipment to bear too large;Overall structure uses more stable design, improves bottom plate strength, prevents maintenance treading deformation influence water flow path. Significantly improve water leakage detection sensitivity, shorten response time, ensure that trace leakage triggers alarm early, and enhance equipment reliability, eliminate false detection and miss detection hidden danger caused by unreasonable water collecting form and structure easy to deform, guarantee converter valve safe and stable operation.

Description

Technical Field

[0001] This utility model belongs to the field of thyristor converter valve testing technology, specifically relating to a bottom shield for detecting leakage in thyristor converter valves. Background Technology

[0002] In the field of ultra-high voltage power transmission, thyristor converter valves are core equipment for AC / DC power conversion and transmission. Under high load operation, they generate a large amount of heat. To ensure stable equipment performance and extend service life, the industry commonly uses pure water cooling systems for efficient heat dissipation. However, if the cooling water in the pure water cooling system leaks, it can directly affect the insulation performance and circuit stability of the converter valve, leading to potential safety hazards. Therefore, installing leakage detection devices on converter valves has become standard practice in the industry. The ability of the leakage detection device to detect leaks early and effectively directly determines whether the maintenance team can quickly formulate and implement handling measures, thereby preventing equipment failure or downtime caused by escalating leakage.

[0003] However, the existing leak detection schemes for converter valves have significant flaws in the design of the shielding cover structure that works in conjunction with the detection device, resulting in detection sensitivity that is difficult to meet actual operation and maintenance needs. First, the shielding cover is tilted due to installation angle requirements, and its actual water collection area is a continuous line rather than a concentrated point. This means that leaked cooling water must accumulate to a certain volume on this water collection line before it can contact and trigger the leak detection device, thus prolonging the detection response time. Second, the bottom of the shielding cover is made of a thin plate with a thickness of only 2-3mm. This thin plate has low structural strength, and during routine equipment maintenance, the footsteps of maintenance personnel can easily cause plastic deformation of the bottom plate, forming a locally uneven surface. This deformation further changes the collection path and accumulation conditions of the cooling water, indirectly increasing the minimum amount of leakage required to trigger the alarm of the detection device, and further reducing the detection device's ability to identify minute leaks.

[0004] It is evident that the existing leakage detection technology for thyristor converter valves suffers from low sensitivity due to unreasonable water collection methods of the shielding cover and easy deformation of the base plate. This makes it impossible to detect leakage in the converter valve in a timely manner, posing a potential threat to the safe and stable operation of the converter valve. Utility Model Content

[0005] This utility model provides a bottom shield for leak detection of thyristor converter valves. The bottom shield structure can effectively solve the problems of unreasonable water collection form of the shield cover and easy deformation of the bottom plate in the existing leak detection technology of thyristor converter valves. It improves the sensitivity of the leak detection device and ensures the safe and stable operation of the converter valve by detecting the leak of the converter valve at an early time.

[0006] To achieve the above objectives, the present invention adopts the following technical content: A bottom shield for detecting leakage in a thyristor converter valve, including a shielding cover; The shielding cover is fixedly connected to the bottom of the valve tower of the thyristor converter valve; A water collection tray is installed inside the shielding cover; The water collection tray has a V-shaped structure, including a U-shaped groove in the middle; a drain pipe is inserted vertically into the U-shaped groove; a leakage detection device is installed on the drain pipe; The leak detection device is positioned below the inlet height of the drain pipe.

[0007] Furthermore, multiple sets of support frames are provided between the two sides of the shielding cover; the support frames are located above. The support frame is connected to the bottom of the valve tower of the thyristor converter valve via an insulating screw.

[0008] Furthermore, multiple sets of support frames are arranged in parallel; the support frames are made of channel aluminum.

[0009] Furthermore, multiple mounting bases are provided on the inner wall of the shielding cover; The edge of the water collection tray is fixedly connected to the shielding cover via a mounting base.

[0010] Furthermore, the mounting bases are evenly distributed along the inner sidewall edge of the shield.

[0011] Furthermore, the water collection tray adopts a spliced ​​structure, including a first plate and a second plate located on both sides. The first plate and the second plate have the same structure, and the U-shaped groove connects the first plate and the second plate. The first plate body includes a first aluminum plate and a second aluminum plate; the two aluminum plates are connected by flange bolts. Both the first and second plates have a downward tilt angle relative to the horizontal plane, forming an overall V-shaped structure together with the U-shaped groove.

[0012] Furthermore, the U-shaped groove is made of a third aluminum plate, which is stacked and connected to the bottom of the first plate and the second plate.

[0013] Furthermore, the joints of the water collection tray are all coated with silicone sealant.

[0014] Furthermore, the U-shaped channel is inclined so that the water in the U-shaped channel collects at one end of the U-shaped channel; the drain pipe is inserted at one end of the U-shaped channel.

[0015] Furthermore, the outlet of the drain pipe extends from the bottom of the water collection tray and communicates with the opening of the shield; the connection between the outlet end face of the drain pipe and the opening of the shield is sealed and welded.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a bottom shield for leak detection of thyristor converter valves, including a shielding cover fixed to the bottom of the valve tower, with a V-shaped water collection tray installed inside. The center of the water collection tray has a U-shaped groove, in which a drain pipe is vertically inserted. The leak detection device is located below the inlet of the drain pipe. The V-shaped structure can efficiently collect leaked cooling water to the center point of the U-shaped groove, rather than the linear water collection method of the traditional inclined cover, avoiding water volume accumulation delay. The drain pipe can prevent excessive accumulation of leaked water inside the shielding cover, which would cause excessive load on the equipment. The overall structure adopts a more stable design, improving the strength of the base plate and preventing deformation caused by maintenance personnel stepping on it, thus affecting the water flow path. This significantly improves the sensitivity of leak detection, shortens the response time, ensures early alarm triggering for minor leaks, enhances equipment reliability, eliminates the hidden dangers of false detection and missed detection caused by unreasonable water collection methods and easily deformable structures, and ensures the safe and stable operation of the converter valve.

[0017] Preferably, in this invention, the addition of multiple sets of support frames connected to the bottom of the valve tower using insulated screws significantly enhances the overall structural rigidity and load-bearing capacity of the shield. This design effectively disperses the load borne by the shield, especially resisting the local pressure caused by personnel stepping on it during equipment maintenance, preventing plastic deformation of the base plate, and thus maintaining the preset water collection tray shape and water collection path, avoiding the problem of decreased detection sensitivity due to structural deformation.

[0018] Preferably, in this invention, parallel-arranged channel aluminum is used as the support frame, further optimizing the structural strength and stability. The inherent high strength and rigidity of the channel aluminum material, combined with the parallel arrangement, can provide uniform and strong support, ensuring that the entire bottom shield of the shield remains flat and undeformed under stress, providing a solid foundation for the stable operation of the water collection tray.

[0019] Preferably, in this invention, multiple mounting seats are provided on the inner wall of the shielding cover to fix the edge of the water collection tray, thus achieving reliable installation and posture maintenance of the water collection tray. This multi-point rigid connection method firmly positions the water collection tray in the required spatial position and tilt angle, preventing it from shifting or sagging during use, ensuring that the V-shaped water collection surface is always in the best working condition, and that the water flow guidance is precise and reliable.

[0020] Preferably, in this invention, the evenly distributed mounting base design makes the fixing force on the water collection tray more balanced. This arrangement eliminates local stress concentration points, reduces the risk of failure or deformation of the fixing points due to external forces or their own weight, ensures the long-term stability of the water collection tray installation and the stability of its geometric shape, and further consolidates the water collection performance.

[0021] Preferably, in this invention, the water collection tray adopts a structure in which two symmetrical plates are spliced ​​together and connected to a U-shaped groove in the middle to form an overall V-shape, which has the advantages of convenient manufacturing and installation. This design reduces the processing difficulty and transportation cost of large and complex components. At the same time, the downward tilt angle of the two side plates naturally connects with the U-shaped groove, optimizing the water flow guidance efficiency. The flanged edges between the plates and the screw connection also enhance the rigidity of the connection parts and the overall structural strength, resisting potential deformation.

[0022] Preferably, in this invention, the U-shaped channel is constructed by stacking individual aluminum plates under the two side plates, ensuring that leaked water flows smoothly from the two side plates into the U-shaped channel.

[0023] Preferably, in this invention, silicone sealant is applied to all joints of the water collection tray, providing excellent sealing protection. This measure effectively prevents the collected cooling water from leaking out of the joints, ensuring that all leaked liquid is completely collected, eliminating detection omissions or delays caused by leakage, and improving the integrity of the detection system.

[0024] Preferably, in this invention, the U-shaped trough itself is inclined, further guiding the collected water flow to one end of the trough. This design, based on the collection of the V-shaped water collection tray, achieves secondary drainage within the trough, causing all the water accumulated in the trough to quickly flow to the drain pipe inlet, minimizing the amount of residual water in the trough, further accelerating the detection response and improving the reliability of detecting minute leaks.

[0025] Preferably, in this invention, the drain pipe outlet extends and is connected to the shielding cover opening via a sealed weld, ensuring the absolute sealing of the water flow channel. This sealed welding method completely eliminates the possibility of leakage or splashing of collected cooling water at the drain pipe outlet, ensuring that all water flow is discharged through the designed pipe path and monitored by the detection device. At the same time, the welded connection also enhances the mechanical strength and long-term reliability of the pipe interface. Attached Figure Description

[0026] Figure 1 A schematic diagram of the structure of a bottom shield for leak detection of a thyristor converter valve provided in this embodiment of the utility model; Figure 2 A schematic diagram of the shielding cover structure provided in an embodiment of this utility model; Figure 3 A schematic diagram of the water collection tray structure provided in the embodiment of this utility model; wherein, (a) is a schematic diagram of the inclined arrangement of the aluminum plates on both sides; and (b) is a schematic diagram of the inclined arrangement of the U-shaped groove in the middle. Figure 4 A schematic diagram of the assembly of the water collection tray provided for an embodiment of this utility model; Figure 5A schematic diagram of the U-shaped groove joint of the water collection tray provided in an embodiment of this utility model; Figure 6 A schematic diagram of a drain pipe provided in an embodiment of this utility model; Figure 7 A schematic diagram of the leakage detection and alarm liquid level of the thyristor converter valve provided in this embodiment of the utility model.

[0027] Figure label: 1. Shielding cover; 2. Water collection tray; 3. Drain pipe; 4. Mounting base; 5. Support frame; 6. Leakage detection device. Detailed Implementation

[0028] To make the technical problem solved by this utility model, the technical solution, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of this utility model. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, 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, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, 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, and therefore should not be construed as a limitation of this utility model.

[0033] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] As mentioned in the background section, on the one hand, the water collection point after the shielding cover is tilted is a line rather than a point, requiring a significant amount of water to trigger the leak detection device. On the other hand, the bottom of the shielding cover is a thin plate of 2-3mm thickness. During equipment maintenance, the bottom plate deforms due to personnel stepping on it, resulting in unevenness and increasing the amount of leakage that triggers the alarm. This design leads to low sensitivity of the leak detection device, preventing timely detection and effective protective measures after the converter valve leaks, thus posing a potential hazard to the safe operation of the equipment.

[0036] To address the aforementioned issues, this embodiment provides a bottom shield for leak detection of thyristor converter valves. This structure incorporates a water collection tray inside the shield, allowing all leaked water dripping into the bottom shield to collect in one place. The leak detection device is fixed near the lowest point of the collection tray. An aluminum frame is installed at the bottom of the collection tray to support it and withstand the force of maintenance personnel stepping on it, preventing deformation. Simultaneously, to prevent excessive accumulation of leaked water inside the shield and thus excessive equipment load, a drainage aluminum pipe is installed. Once the accumulated leaked water exceeds a certain amount, it will drain from the bottom of the bottom shield through the drainage aluminum pipe and drip onto the valve hall floor.

[0037] like Figure 1 As shown, this embodiment provides a bottom shield for leak detection of a thyristor converter valve, including a shield cover 1, a water collection tray 2, and a drain pipe 3; the specific structural arrangement and connection relationship of each component are as follows: like Figure 2As shown, the shield 2 is fixedly connected to the bottom of the thyristor converter valve tower. Twenty mounting bases 4, preferably fixed aluminum bases, are welded below the aluminum tube (with its circular edge) of the shield 1 to fix the water collection tray 2. Additionally, a support frame 5 is welded slightly below the aluminum tube of the shield 1; in this embodiment, four slotted aluminum tubes are preferably used. Holes are made in the slotted aluminum tubes at corresponding positions to the 16 strings of insulating screws of the valve tower, and the aluminum tubes are connected to the bottom of the valve tower via the insulating screws. The welding positions and hole positions are consistent with existing interfaces.

[0038] like Figure 3 As shown, the water collection tray 2 has a V-shaped structure. The V-shape facilitates the collection of leaked water in the middle, with a U-shaped groove in the center, such as... Figure 3 As shown in Figure (b), the U-shaped trough has a certain inclination angle. In this embodiment, an inclination angle of 1° is used to collect the water in the middle of the U-shaped trough at one end. Specifically, as shown... Figure 3 As shown in (a) in this embodiment, the inclination angle between the two side plates and the horizontal plane is 3° so that the leaked water collects in the middle U-shaped groove.

[0039] like Figure 4 As shown, the water collection tray 2 adopts a spliced ​​structure, which is composed of five 3mm thick aluminum plates. The aluminum plates are connected by flange bolts. Serial numbers 1 and 3 are exactly the same, as are 2 and 4. Furthermore, 1 and 3 are mirror images of 2 and 4.

[0040] like Figure 5 As shown, specifically, the U-shaped channel is aluminum plate number 5. When it overlaps with aluminum plates numbered 1-4 on the V-shaped surface, plate number 5 is placed under the aluminum plates on both sides, thereby ensuring that the leaked water flows smoothly from plates numbered 1-4 to plate number 5.

[0041] Explained, in order to ensure that water does not flow between the water collection tray 2 and the shield 1, the dimensions of all edges of the water collection tray 2 extend 10mm beyond the lowest point of the round tube (aluminum tube) of the shield 1.

[0042] In this embodiment, all joints of the water collection tray 2 are coated with silicone sealant to ensure a sealing effect.

[0043] like Figure 6As shown, near the lowest point of the water collection pan 2, a section of drain pipe 3 is opened and sealed by welding. A rectangular aluminum pipe is preferred as the drain pipe 3, extending to the bottom aluminum plate of the shielding cover 1. The bottom aluminum plate of the shielding cover 1 has an opening, which is sealed and welded to the end face of the drain pipe 3. When the leaked water accumulated in the water collection pan 2 exceeds a certain amount, it will drain from the bottom of the shielding cover 1 along the drain pipe 3, dripping onto the valve hall floor. This prevents excessive accumulation of leaked water inside the shielding cover 1, which would increase the load on the valve tower. It also reduces the workload of cleaning residual leaked water. In this embodiment, two holes are opened at the upper end of the drain pipe 3 to insert wire threaded sleeves, which can be used to fix the leak detection device 6. In this embodiment, the leak detection device is a prism leak detection device. The fixed position of the leak detection device 6 is lower than the inlet height of the drain pipe 3, facilitating detection while also ensuring drainage effectiveness.

[0044] The bottom shield provided in this embodiment reduces the amount of leakage water required to trigger the alarm and improves the sensitivity of the leakage detection device by adding a water collection tray inside the valve tower shield 1 of the converter valve. In addition, the water collection tray 2 is reinforced by adding a support frame (aluminum frame) to prevent the water collection tray 2 from deforming due to being stepped on. The addition of a drain pipe 3 prevents excessive accumulation of leaked water inside the shield 1, thus avoiding the problem of excessive load on the equipment.

[0045] like Figure 7 As shown, according to on-site measurements, pouring about 20L of water into the bottom shield provided in this embodiment can trigger a leak detection alarm. According to the actual measurement results of the bottom shield, when the water level at the bottom of the water collection pan 2 is about 8mm (the leakage is about 0.58L), an alarm can be triggered. It can be seen that the bottom shield structure provided in this embodiment greatly improves the sensitivity of the leak detection device.

[0046] In summary, this utility model provides a bottom shield for leak detection of thyristor converter valves, which has the following advantages compared with existing shielding structures: This invention adds a water collection function inside the shielding cover, which can detect and alarm on leaks in the early stages of minor leaks, greatly improving the sensitivity of equipment leak detection. This helps maintenance personnel to discover leaks as early as possible and deal with them in a timely manner, preventing related hidden dangers from escalating.

[0047] The above embodiments are merely one of the implementation methods to achieve the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model.

Claims

1. A bottom shield for detecting leakage in a thyristor converter valve, characterized in that, Including shielding cover (1); The shield (1) is fixedly connected to the bottom of the valve tower of the thyristor converter valve; A water collection tray (2) is installed inside the shield (1); The water collection tray (2) has a V-shaped structure, including a U-shaped groove in the middle part; a drain pipe (3) is inserted vertically into the U-shaped groove; a leakage detection device (6) is installed on the drain pipe (3); The position of the leakage detection device (6) is lower than the inlet height of the drain pipe (3).

2. The bottom shield for leak detection of a thyristor converter valve according to claim 1, characterized in that, Multiple sets of support frames (5) are provided between the two sides of the shield (1); the support frames (5) are located above it; The support frame (5) is connected to the bottom of the valve tower of the thyristor converter valve by an insulating screw.

3. The bottom shield for leak detection of a thyristor converter valve according to claim 2, characterized in that, Multiple sets of support frames (5) are arranged in parallel; the support frames (5) are made of channel aluminum.

4. The bottom shield for leak detection of a thyristor converter valve according to claim 1, characterized in that, Multiple mounting bases (4) are provided on the inner wall of the shield (1); The edge of the water collection tray (2) is fixedly connected to the shield (1) via the mounting base (4).

5. The bottom shield for leak detection of a thyristor converter valve according to claim 4, characterized in that, The mounting base (4) is evenly distributed along the inner sidewall edge of the shield (1).

6. The bottom shield for leak detection of a thyristor converter valve according to claim 1, characterized in that, The water collection tray (2) adopts a spliced ​​structure, including a first plate and a second plate located on both sides. The first plate and the second plate have the same structure, and the U-shaped groove is connected between the first plate and the second plate. The first plate body includes a first aluminum plate and a second aluminum plate; the two aluminum plates are connected by flange bolts. Both the first and second plates have a downward tilt angle relative to the horizontal plane, forming an overall V-shaped structure together with the U-shaped groove.

7. A bottom shield for leak detection of a thyristor converter valve according to claim 6, characterized in that, The U-shaped groove is made of a third aluminum plate, which is stacked and connected to the bottom of the first plate and the second plate.

8. A bottom shield for leak detection of a thyristor converter valve according to claim 6, characterized in that, The joints of the water collection tray (2) are all coated with silicone sealant.

9. A bottom shield for leak detection of a thyristor converter valve according to claim 1, characterized in that, The U-shaped channel is inclined so that the water in the U-shaped channel collects at one end of the U-shaped channel; the drain pipe (3) is inserted at one end of the U-shaped channel.

10. A bottom shield for leak detection of a thyristor converter valve according to claim 1, characterized in that, The outlet of the drain pipe (3) extends from the bottom of the water collection tray (2) and communicates with the opening of the shield (1); the connection between the outlet end face of the drain pipe (3) and the opening of the shield (1) is sealed and welded.

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