A monitoring node component and a wireless monitoring system for fire protection pipelines in converter stations

Abstract

The present invention provides a monitoring node assembly and a monitoring system, including a mounting body, an operating rod, and an electromagnetic driver; a through cavity is formed inside the mounting body, one end of the operating rod forms a sealing portion that slides and seals with the cavity, and the other end extends out of the cavity to form an operating portion that cooperates with the electromagnetic driver; the electromagnetic driver cooperates with the operating portion to realize the telescopic movement of the sealing portion in the inner cavity; the sealing portion and the inner cavity wall form a sealed sampling cavity, and the sampling cavity is provided with a sensor interface; the sealing portion is provided with a water inlet and a water outlet that are connected to the sampling cavity. The present invention can introduce the water flow inside the water body into the sampling cavity through the sampling flow path, and amplify the water temperature change during leakage according to the difference in water temperature between the inside and outside of the pipe body, thereby improving the sensitivity of leakage detection. The present invention is a long-axis component as a whole, which is easy to assemble and disassemble and complies with the pipeline assembly principle.

Description

Technical Field

[0001] The present invention relates to the technical field of converter station fire protection system monitoring, in particular to a monitoring node component and a converter station fire protection pipeline wireless monitoring system. Background Art

[0002] As a crucial component of modern power systems, converter stations bear the crucial responsibility of changing voltage and transmitting electrical energy. Firefighting facilities are crucial for the safe and stable operation of power system equipment and facilities, and are crucial to the safety of the power grid and the lives and property of the people. Because existing firefighting regulations primarily focus on civilian firefighting, they inadequately consider the high electromagnetic radiation and strong interference characteristics of converter station environments. Furthermore, they are unable to adapt to the complex environments of unmanned converter stations, which have become increasingly prevalent in recent years. Consequently, existing firefighting systems at converter stations suffer from insufficient fault monitoring capabilities and low O&M service standards, failing to meet the firefighting requirements for heavy-duty power equipment and facilities.

[0003] In recent years, with the continuous increase in voltage levels of high-voltage direct current (HVDC) transmission, the number and capacity of power equipment in converter stations have continued to increase. Fire protection pipes are subject to the influence of ground currents flowing into the converter stations, resulting in frequent accidents such as aging, corrosion, perforation, and leakage, posing a significant fire safety hazard. In this context, leak monitoring and early warning of fire protection pipes in converter stations are particularly important. The long-term, high-reliability maintenance of fire protection systems requires efficient, rapid, and accurate fire protection monitoring and operation and maintenance services. However, due to the complex causes of failures in existing converter station fire protection systems, the low level of interconnectivity of monitoring devices, the unreasonable positioning schemes for monitoring devices, and the difficulty in coordinating the system operation and maintenance process, accurate fire protection system monitoring has become a challenge.

[0004] The converter station incurs huge monthly water bills, and the cost of repairing leaks is high. Without any effective historical data to assist in fault diagnosis, the core issue that needs to be addressed urgently is how to help the converter station identify early leaks and design an integrated technical system for operation monitoring and fault diagnosis.

[0005] Currently, fire protection pipe networks in converter stations are typically directly buried, making them prone to leaks at their interfaces, and the pressure gauges are offline. The pressure-stabilizing pump is one of the key indicators for identifying potential leaks within the station, and manual judgment is based on the pump's startup frequency. The existing device uses an offline pressure gauge that lacks vibration and temperature information. Some water reservoirs have hydraulic monitoring, while others do not. The following are some of the existing problems:

[0006] ① Traditional in-station sensors are rarely used, and some offline monitoring devices only have display functions and cannot realize data upload and real-time storage.

[0007] ② Currently, the only data dimension is pressure value, and the data of the pump room, valve well, and deluge valve are basically offline or unrecorded. There is a lack of valid fault label data, and it is impossible to carry out any algorithm operation based on data analysis (including machine learning, rule reasoning, statistical analysis, etc.).

[0008] Considering that existing fire protection pipelines usually have branch interfaces for instrument access, in order to avoid damaging existing equipment, it is possible to consider using existing branch interfaces as monitoring points to achieve multi-source data acquisition in fire protection pipelines.

[0009] According to actual analysis, when there is a water leak in the fire protection pipeline, the pipeline will have the following signal changes:

[0010] 1. When there is a leak in the pipeline, the internal water pressure will be slowly consumed, so the pressure-stabilizing pump will start frequently. Therefore, the vibration signal of the pressure-stabilizing pump can be used as one of the bases for leak monitoring;

[0011] 2. When there is a leak in the pipeline, eddy currents will be generated at the leak point, thus forming sound waves. Therefore, the identification of sound waves can be used as one of the bases for leak monitoring.

[0012] 3. When there is a leak in the pipeline, the water pressure and temperature in the pipeline will also fluctuate greatly, so it can be used as one of the bases for leak monitoring.

[0013] Traditionally, fire protection piping systems in converter stations have been monitored using single, offline pressure gauges. This makes it impossible to obtain effective data when leak monitoring is required.

[0014] Although there are many IoT-based devices such as temperature and vibration sensors, wireless pressure sensors, and wireless gateways, such devices are difficult to directly apply to the fire protection pipelines of converter stations. Summary of the Invention

[0015] The technical problem to be solved by the present invention is how to connect devices such as temperature vibration sensors and wireless pressure sensors to fire protection pipelines.

[0016] The present invention solves the above technical problems through the following technical means:

[0017] A monitoring node assembly includes a mounting body, a joystick, and an electromagnetic driver. The mounting body defines a through-cavity. One end of the joystick forms a sealing portion that slides and seals with the cavity, while the other end extends out of the cavity to form a manipulation portion that cooperates with the electromagnetic driver. The electromagnetic driver cooperates with the manipulation portion to achieve telescopic movement of the sealing portion within the cavity.

[0018] The sealing portion and the inner cavity wall form a sealed sampling cavity, which has a sensor interface. The sealing portion also has a water inlet and outlet connected to the sampling cavity. The present invention, through the sampling flow path, can draw water from the interior of the water body into the sampling cavity. Based on the temperature difference between the water inside and outside the pipe, the temperature change during a leak is amplified, thereby enhancing the sensitivity of leak detection. The present invention is a long, axial component, making it easy to assemble and disassemble, and conforming to pipeline assembly principles.

[0019] Furthermore, the water inlet has a smaller diameter than the water outlet.

[0020] Furthermore, the electromagnetic driving component includes an electromagnetic coil, a spring, and a fixed iron core; the operating part slides in the center hole of the electromagnetic coil and the fixed iron core; a retaining ring is also fixed at one end of the operating part located at the sealing part; the spring is limited between the electromagnetic coil and the retaining ring; the electromagnetic coil is fixed to the mounting body through the shell.

[0021] Furthermore, a trigger switch is installed at the end of the sealing part; a first conductive sheet and a second conductive sheet are fixed at the center of the joystick; a first contact sheet and a second contact sheet are fixed at the tail of the joystick; the first conductive sheet, the second conductive sheet, the trigger switch, the first contact sheet, the second contact sheet, and the controller are connected in series; and the controller is connected to a power supply and an electromagnetic coil.

[0022] Furthermore, the trigger switch includes a pressing plate and a compression spring; a conductive rod extends from one side of the pressing plate; the compression spring is sleeved on the conductive rod; a limiting hole is opened at the end of the sealing portion, and the trigger switch is limited in the limiting hole; when water pressure acts on the pressing plate, the conductive rod passes through the limiting hole to connect the first conductive plate and the second conductive plate.

[0023] Furthermore, the axis of the joystick is provided with two limiting grooves, and the first conductive sheet and the second conductive sheet are respectively embedded in the limiting grooves.

[0024] Furthermore, the limiting groove is provided with a sliding groove along the axis of the joystick, the first contact piece and the second contact piece are fixed on the outside of the joystick, and extend through the sliding groove into the limiting groove through the extension portion to be slidably connected with the corresponding conductive piece.

[0025] Furthermore, the front end of the mounting body is configured with an external thread for connecting to a branch interface of a fire protection pipeline.

[0026] Furthermore, the shell includes two chambers, the spring is located in the chamber close to the mounting body, and the electromagnetic coil and the fixed iron core are located in the other chamber; the operating rod passes through the shell.

[0027] The present invention also provides a wireless monitoring system for fire protection pipelines in a converter station, comprising the above-mentioned monitoring node assembly.

[0028] The advantages of the present invention are:

[0029] The present invention uses a sampling flow path to guide the water flow inside the water body into the sampling chamber. Based on the temperature difference between the water inside and outside the pipe, the temperature change during a leak is amplified, thereby improving the sensitivity of leak detection. The present invention is an overall long shaft, which is easy to assemble and disassemble, and conforms to the principles of pipeline assembly.

[0030] The diameter of the water inlet is smaller than that of the water outlet, which can make the water pressure at the water outlet of the sampling channel lower than the water pressure at the water inlet, thereby facilitating the flow of water in the sampling channel along the set direction to ensure the sensitivity of temperature and pressure collection.

[0031] The series circuit where the trigger switch is located can identify the fire extinguishing action, control the retraction of the joystick in time, and ensure the fire water pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the overall structure of the monitoring node assembly in Example 1 of the present invention;

[0033] Figure 2 A cross-sectional view and a partially enlarged view of a monitoring node assembly in Example 1 of the present invention;

[0034] Figure 3 Schematic diagram of the structure of the joystick in Example 1 of the present invention;

[0035] Figure 4 Schematic diagram of the end face structure of the sealing portion of the joystick in Example 1 of the present invention;

[0036] Figure 5 Schematic diagram of the cross-sectional structure of the operating portion of the joystick in Example 1 of the present invention;

[0037] Figure 6 is a schematic diagram of a series circuit in Example 1 of the present invention;

[0038] Figure 7 This is a schematic diagram of the detection system structure in Example 2 of the present invention. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] This embodiment provides a monitoring node component, such as Figure 1As shown, the device comprises a mounting body 1, a joystick 2, and an electromagnetic driver 3. The mounting body 1 in this embodiment is generally shaped like a hexagonal nut, making it convenient to use a wrench when connecting to the pipeline. The mounting body 1 has a through-hole formed within it, with an external thread at the front end for threaded connection to the pipeline. The rear end is a flange 11, which is bolted to the housing 4.

[0041] like Figure 2 As shown, one end of the operating rod 2 forms a sealing portion 21 that slides and seals with the cavity, and the other end extends out of the cavity to form an operating portion 22 that cooperates with the electromagnetic driver 3; the electromagnetic driver 3 and the operating portion 22 cooperate to achieve the telescopic movement of the sealing portion 21 in the inner cavity; the specific structure is as follows:

[0042] like Figure 3 As shown, the front end of the joystick 2 is a large diameter section, and a sealing ring 212 is provided behind the large diameter section 211. The large diameter section 211 and the sealing ring 212 form a sealing portion 21. The sealing ring 212 and the large diameter section 211 slide in a sealed manner with the interior of the mounting body 1 to form a sealed sampling cavity 213. A sensor interface connected to the sampling cavity 213 is provided on the mounting body 1; the large diameter section 211 is provided with a water inlet 214 and a water outlet 215 connected to the sampling cavity 213. In this embodiment, there are two sensor interfaces, which are used to install the temperature vibration sensor 5 and the wireless pressure sensor 6 respectively. The two sensors are located on two opposite sides of the mounting body 1 to minimize interference. Figure 4 As shown, the diameter of the water inlet 214 is smaller than that of the water outlet 215. This allows the water pressure at the water outlet 215 of the sampling channel to be lower than that at the water inlet 214. This facilitates the flow of water in the sampling channel along the set direction, thereby ensuring the sensitivity of temperature and pressure acquisition. In fact, when the leak point is large enough, water backflow may also occur. In this case, the above design can no longer guarantee the flow of water in the sampling channel along the set direction. However, a leak that reaches the point of water backflow is already very large, and sensitivity is no longer necessary.

[0043] like Figure 2 As shown, the electromagnetic drive component 3 includes an electromagnetic coil 31, a spring 32, and a fixed iron core 33; the operating portion 22 slides within the center holes of the electromagnetic coil 31 and the fixed iron core 33; a retaining ring 221 is also fixed to the end of the operating portion 22 facing the sealing portion 21; 32 is limited between the electromagnetic coil 31 and the retaining ring 221; the housing 4 includes two chambers, the spring 32 is located in the chamber close to the mounting body 1, and the retaining ring 221 and the spring 32 are located in the same chamber. The electromagnetic coil 31 and the fixed iron core 33 are located in the other chamber; the housing 4 has a through hole for the operating rod 2 to pass through the two chambers. The diameter of the through hole is slightly larger than the diameter of the operating rod 2 to preferably not affect the extension and retraction of the operating rod 2. The housing 4 is fixed to the mounting body 1 via the rear flange 11 of the mounting body 1, and the through hole is coaxial with the inner cavity of the mounting body 1.

[0044] In order to ensure that the operating lever 2 can be quickly retracted until the sealing portion 21 is completely retracted into the inner cavity of the mounting body 1 during the fire extinguishing operation, so as not to hinder the flow of water, thereby effectively ensuring that the water pressure at the outlet is not lost, this embodiment uses a trigger switch to trigger the electromagnetic driving member 3, and the specific structure is as follows: Figure 5 As shown, the joystick 2 has two retaining slots 23 along its axis, with a first conductive piece 71 and a second conductive piece 72 respectively embedded within the retaining slots 23. Each retaining slot 23 has a slide 24 extending from the outer wall of the joystick 2 to the retaining slot. An annular conductive member 70 is sleeved onto the exterior of the joystick 2. Extending from the annular conductive member 70 are first and second contact pieces 73 and 74, which extend through their corresponding slides 24 into the retaining slots 23 to electrically connect with the corresponding conductive pieces. In this embodiment, the annular conductive member 70 remains stationary, but the joystick 2 undergoes telescopic movement. The contact pieces enter the retaining slots 23 through the slides 24, slidingly engaging with the conductive pieces without affecting the electrical connection. In this embodiment, the first and second conductive pieces 71 and 72 are elongated metal strips, with their front ends extending all the way to the sealing portion. Their interaction with the trigger switch is described in detail in the following section. The annular conductive member 70 is fixed to the outer wall of the joystick 2 by welding or bolts, or is fixed to the housing 4 by welding or bolts.

[0045] A trigger switch 8 is installed at the end of the sealing part 21; the trigger switch 8 includes a pressing piece 81 and a compression spring 82; a conductive rod 83 extends from one side of the pressing piece 81; the compression spring 82 is sleeved on the conductive rod 83; a limiting hole is opened at the end of the sealing part 21, and the limiting hole is a cylindrical cavity, and the diameter of the hole at one end facing the water pipe is smaller than the pressing piece 81, so as to prevent the pressing piece 81 from falling out of the limiting hole, and a sliding hole connected to the two limiting grooves 23 is opened at the other end, and the conductive column can be extended and retracted in the sliding hole, enter the limiting groove 23 and contact the first conductive piece 71 and the second conductive piece 72. In this embodiment, the first conductive piece 71, the second conductive piece 72, the trigger switch 8, the first contact piece 73, the second contact piece 74, and the controller are connected in series; the controller is connected to the power supply and the electromagnetic coil 31, such as Figure 6 shown.

[0046] Example 2

[0047] Based on Example 1, this embodiment applies the monitoring node component in Example 1, such as Figure 7 As shown, the node assembly is connected to the interface of the pipeline instrument such as the pressure gauge reserved in the existing pipeline 10 through the installation body 1 to form a wireless monitoring system for the fire protection pipeline of the converter station.

[0048] The working principle of the components of this embodiment is as follows:

[0049] 1. When there is no leakage point in the fire protection pipeline

[0050] When there is no leakage point, the static water pressure in the fire protection pipe is relatively high. At this time, the pressing piece 81 moves inward under the action of water pressure. At this time, the first conductive piece 71, the second conductive piece 72, the trigger switch 8, the first contact piece 73, the second contact piece 74 and the series circuit of the controller are connected, and the controller receives a signal not to start the electromagnetic drive part 3. At this time, no current flows through the electromagnetic coil 31, the spring 32 acts on the retaining ring 221, and the sealing part 21 extends out of the sampling chamber 213; the water pressure at the water inlet 214 and the water outlet 215 is the same, and the water in the pipeline fills the sampling chamber 213; at this time, the wireless pressure sensor 6 is connected to the interface on the water outlet 215 side, and the temperature vibration sensor 5 is connected to the interface on the water inlet 214 side; in this state, the pressure data, temperature data and vibration data in the sampling chamber 213 have no obvious fluctuations.

[0051] 2. When there is a leak in the fire protection pipeline

[0052] Similar to point 1 above, electromagnetic drive element 3 is not activated in this state. The main difference from point 1 above is that the presence of a leak causes water flow in the pipe, with this flow becoming more pronounced the closer to the leak. The flow of water in the pipe creates a pressure difference between the water inlet 214 and the water outlet 215. Therefore, the water in the pipe does not statically fill the sampling chamber 213, but instead flows slowly within the sampling channel formed by "water inlet 214 → sampling chamber 213 → water outlet 215."

[0053] It can be seen that due to the presence of the external ambient temperature, when the water statically fills the sampling chamber 213, its temperature will approach the ambient temperature; however, when the water slowly flows through the sampling channel, the low-temperature water inside the fire pipe body will cause the water temperature in the sampling chamber 213 to fluctuate; therefore, connecting the temperature vibration sensor 5 to the interface on the side of the water inlet 214 can sensitively detect such temperature fluctuations; and the closer to the leakage point, the more obvious the temperature fluctuation;

[0054] In addition, when the water flows slowly in the sampling channel, the static pressure environment in the sampling channel is destroyed, so the water pressure in the sampling chamber 213 will also fluctuate. Therefore, connecting the wireless pressure sensor 6 to the interface on the side of the water outlet 215 can more sensitively collect such pressure fluctuations.

[0055] 3. When the fire-fighting pipeline is performing fire-fighting action

[0056] When a fire is extinguished, the water pressure in the fire pipe drops instantaneously. This drop causes the pressing piece 81 to move outward, thereby disconnecting the above-mentioned circuit. At this time, the controller detects a switch signal and can control the electromagnetic coil 31 to be energized according to the switch signal, forcing the joystick 2 to overcome the elastic force of the compression spring 32 and retract until the sealing part 21 is completely retracted into the sampling chamber 213. This structure ensures that the sealing part 21 will not hinder the flow of water when the fire is extinguished, thereby effectively ensuring that the water pressure at the outlet is not lost.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A monitoring node component, characterized in that: The invention comprises a mounting body (1), an operating rod (2), and an electromagnetic driving member (3); a cavity is formed inside the mounting body (1); one end of the operating rod (2) forms a sealing portion (21) that is slidably sealed with the cavity, and the other end extends out of the cavity to form an operating portion (22) that cooperates with the electromagnetic driving member (3); the electromagnetic driving member (3) cooperates with the operating portion (22) to realize the telescopic movement of the sealing portion (21) in the inner cavity; The sealing portion (21) and the cavity wall form a sealed sampling cavity (213), and the sampling cavity (213) is provided with a sensor interface; the sealing portion (21) is provided with a water inlet (214) and a water outlet (215) that are in communication with the sampling cavity (213); The electromagnetic drive component (3) comprises an electromagnetic coil (31), a spring (32), and a fixed iron core (33); the operating portion (22) is slidably fitted in the center holes of the electromagnetic coil (31) and the fixed iron core (33); a retaining ring (221) is fixed to one end of the operating portion (22) located at the sealing portion (21); the spring (32) is limited between the electromagnetic coil (31) and the retaining ring (221); the electromagnetic coil (31) is fixed to the mounting body (1) via the housing (4); The water inlet (214) has a smaller diameter than the water outlet (215); A trigger switch (8) is installed at the end of the sealing portion (21); a first conductive sheet (71) and a second conductive sheet (72) are fixed at the center of the joystick (2); a first contact sheet (73) and a second contact sheet (74) are fixed at the tail of the joystick (2); the first conductive sheet (71), the second conductive sheet (72), the trigger switch (8), the first contact sheet (73), the second contact sheet (74), and a controller are connected in series; the controller is connected to a power supply and an electromagnetic coil (31); The trigger switch (8) comprises a pressing plate (81) and a compression spring (82); a conductive rod (83) is extended from one side of the pressing plate (81); the compression spring (82) is sleeved on the conductive rod (83); a limiting hole is provided at the end of the sealing portion (21), and the trigger switch (8) is limited in the limiting hole; when water pressure acts on the pressing plate (81), the conductive rod (83) passes through the limiting hole to conduct the first conductive plate (71) and the second conductive plate (72); The axis of the joystick (2) is provided with two limiting grooves (23), and the first conductive sheet (71) and the second conductive sheet (72) are respectively embedded in the limiting grooves (23); The limiting groove (23) is provided with a sliding groove (24) along the axis of the joystick (2); the first contact piece (73) and the second contact piece (74) are fixed to the outside of the joystick (2) and extend through the sliding groove (24) into the limiting groove (23) through an extension portion to be slidably connected with the corresponding conductive piece.

2. A monitoring node assembly according to claim 1, characterized in that: The front end of the installation body (1) is configured with an external thread for connecting to a branch interface of a fire protection pipeline.

3. A monitoring node assembly according to claim 1, characterized in that: The housing (4) includes two chambers, the spring (32) is located in a chamber close to the mounting body (1), and the electromagnetic coil (31) and the fixed iron core (33) are located in the other chamber; the operating rod (2) passes through the housing (4).

4. A wireless monitoring system for fire protection pipelines in converter stations, characterized in that: The monitoring node assembly comprises any one of claims 1 to 3.

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