Liquid level monitoring device for water tank of generator cooling system

Abstract

The utility model discloses a liquid level monitoring device for a water tank of a generator cooling system, which comprises a high-position sampling tube, a high-position sampling tube and a high-position sampling tube, the low-position sampling pipe is communicated with the lower part of the water tank; the liquid level meters are arranged in parallel, the upper part of each liquid level meter is communicated with the high-position sampling pipe, and the lower part of each liquid level meter is communicated with the low-position sampling pipe; the liquid level switches have an alarm function, and each liquid level switch is correspondingly connected with a preset position of one liquid level meter; and the liquid level transmitter is at least electrically connected with any liquid level meter. And signals are transmitted out through the liquid level transmitter, so that the liquid level condition of the water tank can be remotely monitored. By means of the liquid level meters arranged in parallel, each liquid level meter can operate independently, and when any liquid level meter is lower than the preset position, the liquid level switch triggers an alarm signal. The liquid level monitoring device can effectively monitor the liquid level of the water tank of the generator cooling system, ensure the reliability and effectiveness of triggering an alarm signal by the liquid level switch, and improve the reliability of the generator cooling system.

Description

Technical Field

[0001] This utility model relates to the field of generator cooling system technology, and in particular to a liquid level monitoring device for a generator cooling system water tank. Background Technology

[0002] In a nuclear power plant, the three level switches in the generator cooling system of Units 3 and 4 share a common level gauge sampling cylinder. If the magnetic float in the sampling cylinder breaks, it will sink, causing all three level switches to falsely trip due to low levels. If the magnetic float in the sampling cylinder becomes stuck, the three level switches will fail to trip in time when the water level in the generator cooling system tank is too low, potentially causing the unit to fail to operate.

[0003] If a generator trips due to a malfunction of the magnetic float in the generator cooling system's level gauge during normal operation, restarting the unit will take at least two days. If the magnetic float becomes stuck, causing the unit to refuse to trip and resulting in damage to critical equipment such as the generator, the losses will be enormous. Either scenario will cause significant losses to the power plant and represents a potential design flaw. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a liquid level monitoring device for the water tank of a generator cooling system.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a liquid level monitoring device for a generator cooling system water tank, comprising:

[0006] A high-level sampling tube, wherein the high-level sampling tube is connected to the upper part of the water tank;

[0007] A low-level sampling tube, wherein the low-level sampling tube is connected to the lower part of the water tank;

[0008] Multiple level gauges are connected in parallel, with the upper part of each level gauge connected to the high-level sampling tube and the lower part of each level gauge connected to the low-level sampling tube.

[0009] A liquid level switch for multiple external alarm modules, each liquid level switch being connected to a preset position of one of the liquid level gauges;

[0010] A level transmitter is electrically connected to at least one of the level gauges.

[0011] In some embodiments, the system further includes a plurality of valves, wherein any one of the level gauges is connected to the high-level sampling tube and the low-level sampling tube respectively through at least one of the valves.

[0012] In some embodiments, the system further includes a plurality of supports, each of which is fixedly connected to the high-position sampling tube and / or the low-position sampling tube.

[0013] In some embodiments, the support includes a support column, a plurality of fastening components, and a leg connected to a support of the water tank. The support column is fixedly connected to the leg, and the support column is detachably connected to the high-level sampling tube and / or the low-level sampling tube via the plurality of the fastening components.

[0014] In some embodiments, the high-position sampling tube and the low-position sampling tube are parallel to each other.

[0015] In some embodiments, the level gauge is perpendicularly arranged to the high-level sampling tube and the low-level sampling tube, respectively.

[0016] In some embodiments, the distance between two adjacent level gauges is greater than 400 mm.

[0017] In some embodiments, the level switch is located 125mm below the level gauge.

[0018] In some embodiments, the level gauge is a magnetic float level gauge.

[0019] In some embodiments, the zero marks of the plurality of level gauges are on the same horizontal line.

[0020] By implementing this utility model, the following beneficial effects can be achieved:

[0021] This invention relates to a liquid level monitoring device for a generator cooling system water tank, comprising: a high-level sampling pipe connected to the upper part of the water tank; a low-level sampling pipe connected to the lower part of the water tank; multiple level gauges arranged in parallel, each level gauge having its upper part connected to the high-level sampling pipe and its lower part connected to the low-level sampling pipe; multiple level switches with external alarm modules, each level switch connected to a preset position of one level gauge; and a level transmitter electrically connected to at least one level gauge. The level transmitter transmits signals for remote monitoring of the water tank level. Each of the parallel level gauges can operate independently; when any level gauge falls below the preset position, the level switch triggers an alarm signal. The occurrence of alarm signals from any two level switches constitutes a trip signal. This invention effectively monitors the liquid level in the generator cooling system water tank, ensuring the reliability and effectiveness of the alarm signals triggered by the level switches, thus improving the reliability of the generator cooling system. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0023] Figure 1This is a simplified structural diagram of a liquid level monitoring device for a generator cooling system water tank according to an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A front view of the installation of the high-level sampling tube, low-level sampling tube, and support.

[0025] Figure 3 yes Figure 1 Side sectional view of the high-level sampling tube, low-level sampling tube, and support. Detailed Implementation

[0026] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0028] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 a chemical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication 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.

[0030] See Figures 1 to 3One embodiment of this utility model discloses a liquid level monitoring device for a generator cooling system water tank 100, which can be used to monitor the liquid level of the generator cooling system water tank 100. It can also be used in other liquid level switch systems with similar designs in nuclear power plants, especially those involving tripping, pump tripping, or other control and protection functions. The following description of the liquid level monitoring device is based on an embodiment applied to the generator cooling system water tank 100 in a nuclear power plant.

[0031] like Figure 1 As shown, the liquid level monitoring device includes a high-level sampling tube 1, a low-level sampling tube 2, multiple liquid level gauges 3, multiple liquid level switches 4, and a liquid level transmitter 5. The high-level sampling tube 1 is connected to the upper part of the water tank 100, and the low-level sampling tube 2 is connected to the lower part of the water tank 100. The high-level sampling tube 1 and the low-level sampling tube 2 are used to connect to the water tank 100 to sample the cooling water inside. Multiple liquid level gauges 3 are connected in parallel, with the upper part of each liquid level gauge 3 connected to the high-level sampling tube 1 and the lower part of each liquid level gauge 3 connected to the low-level sampling tube 2. The liquid level gauges 3 are used to measure the liquid level inside the water tank 100 and can be magnetic float liquid level gauges 3. The number of liquid level gauges 3 can be three or four, depending on actual needs. An external alarm module is connected to each liquid level switch 4, and each liquid level switch 4 is connected to a preset position of one liquid level gauge 3. The preset position is the low warning level of the water tank 100, and the preset position can be set according to actual needs. For example, the preset position is a liquid level height of 125mm, meaning the level switch 4 is located 125mm below the level gauge 3. The level switch 4 is used to trigger an alarm and output a trip signal at the preset position. The level transmitter 5 is electrically connected to at least one of the level gauges 3. The level transmitter 5 is used to display the liquid level of any one of the level gauges 3 and can also be used for early warning of corresponding liquid levels. For example, multiple liquid level positions such as 125mm, 200mm, and 370mm can be set for liquid level monitoring. When the level transmitter 5 receives a corresponding liquid level change, it issues an alarm. The alarm module, being part of the generator cooling system, is used to respond to alarms and transmit alarm signals; it is existing technology and will not be described in detail here.

[0032] Generally, the magnetic level gauge 3 used in the liquid level monitoring device of this utility model is a level gauge 3 that operates based on the principle of magnetic coupling. It includes a sampling cylinder, a magnetic float, a flip plate with magnetic elements, and a display panel. The magnetic float is usually a metal ball. The magnetic level gauge 3 is suitable for high temperature, high pressure, and corrosion-resistant applications. It features high sealing and leak-proof characteristics, can indicate the liquid level in the container, and can be remotely monitored via a level transmitter 5. When the liquid level of a certain level gauge 3 drops to a preset position, that is, the water level of the water tank 100 is at the preset position, the magnetic float is simultaneously at the preset position, and the level switch 4 generates a signal through electromagnetic induction. If any two of the corresponding level switches 4 connected to the three level gauges 3 generate signals through electromagnetic induction, the trip signal condition is met. The installation distance between two adjacent level gauges 3 is greater than 400mm, such as 450mm or 500mm, to prevent mutual interference between adjacent magnetic floats.

[0033] Compared to existing monitoring equipment, the liquid level monitoring device of this invention has a one-to-one correspondence between each liquid level switch 4 and a different liquid level gauge 3. That is, each liquid level switch 4 corresponds to the magnetic float of one liquid level gauge 3, eliminating the situation where existing monitoring equipment shares the same sampling cylinder for a single liquid level gauge 3. Even if the magnetic float of any one of the liquid level gauges 3 in this invention's liquid level monitoring device is damaged and sinks, it will not cause all three liquid level switches 4 to simultaneously trigger a false low liquid level signal and trip the generator. Even if the magnetic float of any one of the liquid level gauges 3 in this invention's liquid level monitoring device becomes stuck, when the water level in the generator cooling system water tank 100 is too low, two liquid level switches 4 can still operate normally, meeting the trip signal conditions. This prevents the generator unit from failing to trip due to the failure of all three liquid level switches 4 to alarm in time. The liquid level monitoring device of this invention can prevent tripping due to a single magnetic float malfunction or generator unit failure due to a single magnetic float jamming, ensuring the normal operation of the liquid level monitoring device and reducing economic losses.

[0034] like Figure 2 As shown, in some embodiments, the high-level sampling tube 1 and the low-level sampling tube 2 are parallel to each other to reduce deviation. The high-level sampling tube 1 is provided with a sampling interface 8 and multiple docking interfaces 9, and the low-level sampling tube 2 is similarly provided with a sampling interface 8. The high-level sampling tube 1 and the low-level sampling tube 2 are respectively connected to the water tank 100 through the sampling interface 8 and to the level gauge 3 through the docking interfaces 9. The high-level sampling tube 1 can be connected to the top or a side wall near the top of the water tank 100, and the low-level sampling tube 2 can be connected to the bottom or a side wall near the bottom of the water tank 100. For example, as... Figure 2As shown, the high-level sampling tube 1 has three equally spaced docking interfaces 9, and the low-level sampling tube 2 is similarly provided. The docking interfaces 9 of the high-level sampling tube 1 and the low-level sampling tube 2 correspond one-to-one, and the line connecting them is perpendicular to both the high-level sampling tube 1 and the low-level sampling tube 2. Furthermore, the level gauge 3 is positioned perpendicular to both the high-level sampling tube 1 and the low-level sampling tube 2.

[0035] In some embodiments, the level monitoring device further includes several valves 6, with each level gauge 3 connected to the high-level sampling tube 1 and the low-level sampling tube 2 via at least one valve 6. For example, one valve 6 is located between the docking interface 9 of the high-level sampling tube 1 and the air inlet of the level gauge 3, and is connected to both the docking interface 9 and the air inlet; another valve 6 is located between the docking interface 9 of the low-level sampling tube 2 and the liquid inlet of the level gauge 3, and is connected to both the docking interface 9 and the liquid inlet. The number of valves 6 is twice the number of level gauges 3, allowing each level gauge 3 to be isolated individually for easy maintenance. Understandably, the valves 6 can be connected to the docking interface 9 of the high-level sampling tube 1, the docking interface 9 of the low-level sampling tube 2, the air inlet of the level gauge 3, and the liquid inlet of the level gauge 3 via flanges.

[0036] In some embodiments, the liquid level monitoring device further includes several supports 7, each support 7 being fixedly connected to a high-level sampling tube 1 and / or a low-level sampling tube 2. The supports 7 can be used to fix the high-level sampling tube 1 and / or the low-level sampling tube 2, reducing vibration of the liquid level and connecting pipelines. For example, one support 7 fixes the high-level sampling tube 1, and one support 7 fixes the low-level sampling tube 2, or the same support 7 can fix both the high-level sampling tube 1 and the low-level sampling tube 2. Preferably, in this embodiment, two supports 7 are provided, respectively located between two adjacent liquid level gauges 3, with a liquid level gauge 3 spaced between the two supports 7.

[0037] like Figure 3As shown, in some embodiments, the support 7 includes a support column 71, several fastening components 72, and a leg 73 connected to the support 200 of the water tank 100. The support column 71 is fixedly connected to the leg 73, and the support column 71 is detachably connected to the high-level sampling tube 1 and / or the low-level sampling tube 2 via several fastening components 72. For example, the leg 73 may include two angle steels, one side of which is welded to the support 200, and the other side is welded to the other angle steel. The support column 71 is welded and fixed to the other angle steel. For ease of connection and fixation, the support column 71 may also be an angle steel. Each fastening component 72 may include a U-shaped buckle, two bolts, and two nuts to lock the high-level sampling tube 1 and / or the low-level sampling tube 2. The specific locking method is prior art and will not be described in detail here. Preferably, each support 7 is detachably connected to the high-level sampling tube 1 and the low-level sampling tube 2 respectively via the fastening components 72. When there are multiple supports 7, the connection position of each support 7 with the high-level sampling tube 1 is at the same horizontal line, and the connection position of each support 7 with the low-level sampling tube 2 is at the same horizontal line.

[0038] In some embodiments, during on-site installation, to avoid large deviations in the liquid level display of multiple level gauges 3, the high-level sampling tube 1 and the low-level sampling tube 2 are parallel to each other. After installation, the level gauges 3 are perpendicular to the high-level sampling tube 1 and the low-level sampling tube 2, respectively, and the zero scales of the multiple level gauges 3 are on the same horizontal line. After the multiple level gauges 3 are installed, a water filling test can be performed to check the sealing of the level gauges 3, valves 6, flanges, etc. If the highest and lowest deviations in the liquid level display of the multiple level gauges 3 are within 20mm, the test is considered successful.

[0039] Understandably, considering the specific site conditions, the modification will not involve laying new cables. Instead, a small adapter box will be installed at the original cable interface location to extend the cable length and connect it to each level switch 4. To avoid interference between the level gauge 3 and the existing pipelines of the generator cooling system, the level gauge 3 will be positioned close to the generator.

[0040] By implementing this utility model, the following beneficial effects can be achieved:

[0041] This invention relates to a liquid level monitoring device for a generator cooling system water tank. The device transmits signals via a liquid level transmitter 5, facilitating remote monitoring of the water level in the tank 100. Multiple liquid level gauges 3 are connected in parallel, each capable of independent operation. When any one gauge 3 falls below a preset level, a liquid level switch 4 triggers an alarm signal. The occurrence of alarm signals from any two liquid level switches 4 constitutes a trip signal. This liquid level monitoring device effectively monitors the liquid level in the generator cooling system water tank, ensuring the reliability and effectiveness of the alarm signals triggered by the liquid level switches, thus improving the reliability of the generator cooling system.

[0042] 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, without departing from the concept of the present utility model, the above embodiments or technical features can be freely combined, and several modifications and improvements can be made. These all fall within the protection scope of the present utility model, that is, the embodiments described "in some embodiments" can be freely combined with any of the embodiments above and below. 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 liquid level monitoring device for a generator cooling system water tank, characterized in that, include: A high-level sampling tube (1) is connected to the upper part of the water tank (100); A low-level sampling tube (2) is connected to the lower part of the water tank (100); Multiple level gauges (3) are connected in parallel. The upper part of each level gauge (3) is connected to the high-level sampling tube (1), and the lower part of each level gauge (3) is connected to the low-level sampling tube (2). A liquid level switch (4) for multiple external alarm modules, each of the liquid level switches (4) being connected to a preset position of a liquid level gauge (3); The level transmitter (5) is electrically connected to at least one of the level gauges (3).

2. The liquid level monitoring device for the generator cooling system water tank according to claim 1, characterized in that, It also includes several valves (6), and any one of the level gauges (3) is connected to the high-level sampling tube (1) and the low-level sampling tube (2) respectively through at least one of the valves (6).

3. The liquid level monitoring device for the generator cooling system water tank according to claim 1, characterized in that, It also includes several supports (7), each of which is fixedly connected to the high-position sampling tube (1) and / or the low-position sampling tube (2).

4. The liquid level monitoring device for the generator cooling system water tank according to claim 3, characterized in that, The support (7) includes a support column (71), a plurality of fastening components (72) and a leg (73) connected to the support (200) of the water tank (100). The support column (71) is fixedly connected to the leg (73), and the support column (71) is detachably connected to the high-level sampling tube (1) and / or the low-level sampling tube (2) through the plurality of fastening components (72).

5. The liquid level monitoring device for the generator cooling system water tank according to claim 1, characterized in that, The high-position sampling tube (1) and the low-position sampling tube (2) are parallel to each other.

6. The liquid level monitoring device for the generator cooling system water tank according to claim 5, characterized in that, The level gauge (3) is perpendicular to the high-level sampling tube (1) and the low-level sampling tube (2), respectively.

7. The liquid level monitoring device for the generator cooling system water tank according to any one of claims 1 to 6, characterized in that, The distance between two adjacent level gauges (3) is greater than 400 mm.

8. The liquid level monitoring device for the generator cooling system water tank according to any one of claims 1 to 6, characterized in that, The liquid level switch (4) is located 125 mm below the liquid level gauge (3).

9. The liquid level monitoring device for the generator cooling system water tank according to any one of claims 1 to 6, characterized in that, The level gauge (3) is a magnetic float level gauge (3).

10. The liquid level monitoring device for the generator cooling system water tank according to any one of claims 1 to 6, characterized in that, The zero marks of multiple level gauges (3) are on the same horizontal line.

Images