Leakage-proof device of variable frequency cabinet and variable frequency cabinet

Abstract

The utility model discloses a kind of leakage protection device and frequency conversion cabinet of frequency conversion cabinet, and frequency conversion cabinet includes fan water pipe, fan water pipe includes the bending portion of downward concave, the leakage protection device includes: drain pipe and water collecting tank, at least part drain pipe is sleeved on the outside of fan water pipe, and located below bending portion, drain pipe is equipped with water outlet, water collecting tank is equipped below drain pipe, the top of water collecting tank is equipped with water inlet, water outlet is communicated with water inlet, water outlet is used to drain the liquid in drain pipe to water collecting tank inside. By installing water collecting tank and drain pipe, make drain pipe and leaked coolant drain to water collecting tank, realize the active drainage protection of leakage, improve the leakage effect of frequency conversion cabinet, avoid cooling fluid extravasation damage electrical device in frequency conversion cabinet, improve the security and reliability of frequency conversion cabinet operation, reduce the leakage caused shutdown maintenance. While reducing the unplanned shutdown cost and equipment replacement cost caused by leakage, with remarkable economic benefits.

Description

Technical Field

[0001] This application relates to the field of wind power equipment technology, and in particular to a leak-proof device for a frequency converter cabinet and a frequency converter cabinet. Background Technology

[0002] The fan water pipes in the wind turbine inverter cabinet are used to transport coolant. During long-term operation, coolant leakage is prone to occur due to aging, loose connections, or vibration fatigue. If leaked coolant drips onto the grid-side reactor, it can lead to decreased insulation performance, localized overheating, or even burnout. It may also trigger a chain reaction of problems such as electrical short circuits and control circuit failures, increasing the risk of equipment damage and maintenance costs. Furthermore, leaks causing malfunctions require shutdown for repairs, with single downtime exceeding 12 hours, severely impacting the unit's power generation.

[0003] In related technologies, leakage prevention of frequency converter cabinets relies on regular manual inspections, which has low reliability in leak detection, leading to delayed fault discovery and potential safety hazards due to untimely inspections. Utility Model Content

[0004] This application aims to address at least one of the technical problems existing in the prior art or related technologies.

[0005] The first aspect of this application provides a leak-proof device for a frequency converter cabinet. The frequency converter cabinet includes a fan water pipe, which has a downwardly recessed bend. The leak-proof device includes a drain pipe and a water collection tank. At least a portion of the drain pipe is sleeved on the outside of the fan water pipe and located below the bend. The drain pipe has an outlet. The water collection tank is located below the drain pipe. The top of the water collection tank has an inlet. The outlet is connected to the inlet. The outlet is used to drain the liquid in the drain pipe into the water collection tank.

[0006] In some of the technical solutions provided in this application, a conduit may be provided below the drainage pipe, and the conduit connects the outlet and the inlet.

[0007] In some of the technical solutions provided in this application, one of the two guide sections is fitted onto the outside of the other guide section.

[0008] In some of the technical solutions provided in this application, the leak-proof device also includes: a fastener, and a guide portion of the fastener circumferentially sleeved on the outside.

[0009] In some of the technical solutions provided in this application, the leak-proof device also includes: a shielding member, at least partially covering the portion of the fan water pipe extending from the opening.

[0010] In some of the technical solutions provided in this application, the leak prevention device also includes a detection circuit, which includes a liquid level detection element, which is installed in the water collection tank and is used to obtain liquid level information in the water collection tank.

[0011] In some of the technical solutions provided in this application, the leak prevention device also includes: a control device, which sends a leakage signal when the liquid level in the water collection tank exceeds the trigger threshold, and the control device is used to receive the leakage signal and send an alarm signal.

[0012] In some technical solutions provided in this application, the detection circuit further includes: a linkage switch, a coil, and an air switch. The two ends of the linkage switch are respectively connected to the control device. The coil is used to control the opening and closing state of the linkage switch. The two ends of the coil are respectively connected to the first end of the liquid level detection element and the power supply. The first end of the air switch is connected to the power supply, and the second end of the air switch is connected to the second end of the liquid level detection element.

[0013] In some of the technical solutions provided in this application, the leak-proof device also includes: a viewing window and / or a magnetic component. The viewing window is located on the wall of the water collection tank and is used to view the internal condition of the water collection tank. The magnetic component is located on the outer wall of the water collection tank and is used to detachably connect to the cabinet of the frequency converter cabinet.

[0014] The second aspect of the technical solution of this application proposes a frequency converter cabinet, which includes: a fan water pipe and a leak-proof device provided in any of the above embodiments of the fan water pipe, wherein at least a portion of the drain pipe of the leak-proof device is sleeved on the outside of the fan water pipe.

[0015] Compared with related technologies, this utility model has at least the following beneficial effects:

[0016] By installing a water collection tank and drainage pipes, the leaking coolant is diverted into the tank, achieving active drainage and protection against leakage. This improves the leak prevention effect of the frequency converter cabinet, prevents coolant from seeping out and damaging electrical components inside, enhances the safety and reliability of the cabinet's operation, and reduces downtime for maintenance caused by leaks. Furthermore, the simple structure of the water collection tank and drainage pipes makes the leak prevention modification easy and cost-effective, while also reducing unplanned downtime and equipment replacement costs caused by leaks, resulting in significant economic benefits. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of some embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0018] Figure 1One of the structural schematic diagrams of a leak-proof device provided in this application;

[0019] Figure 2 A second schematic diagram of the structure of a leak-proof device according to an embodiment of this application;

[0020] Figure 3 A partial structural schematic diagram of a leak-proof device according to an embodiment of this application;

[0021] Figure 4 A partial structural schematic diagram of a drainage tube provided in one embodiment of this application;

[0022] Figure 5 This is a schematic diagram of the connection of a detection circuit according to one embodiment of this application.

[0023] in, Figures 1 to 5 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0024] 10. Leakage prevention device; 100. Drainage pipe; 110. Wrapping part; 120. Flow guide part; 121. Water outlet; 122. Opening; 200. Water collection tank; 210. Water inlet; 220. Viewing window; 300. Shielding part; 400. Detection circuit; 410. Liquid level detection part; 420. Interlocking switch; 430. Coil; 440. Air switch; 450. Power supply; 500. Control device; 20. Frequency converter cabinet; 21. Fan water pipe; 22. Bending part. Detailed Implementation

[0025] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0026] The first aspect of this application provides a leak-proof device 10 for a frequency converter cabinet 20, such as... Figure 1 and Figure 2 As shown, the frequency converter cabinet 20 includes a fan water pipe 21, which includes a downwardly recessed bend 22. The leak-proof device 10 includes a drain pipe 100 and a water collection tank 200. At least a portion of the drain pipe 100 is sleeved on the outside of the fan water pipe 21 and located below the bend 22. The drain pipe 100 is provided with an outlet 121. The water collection tank 200 is located below the drain pipe 100. The top of the water collection tank 200 is provided with an inlet 210. The outlet 121 is connected to the inlet 210. The outlet 121 is used to drain the liquid in the drain pipe 100 into the water collection tank 200.

[0027] In this embodiment, due to its long length, a portion of the fan water pipe 21 in the inverter cabinet 20 hangs downwards under gravity, forming a bend 22. The drain pipe 100 can be made of plastic, and at least a portion of the drain pipe 100 wraps around the outside of the fan water pipe 21 and is supported below the bend 22. Following the curved shape of the fan water pipe 21, the drain pipe 100 forms a downwardly concave bend, which has an outlet 121 located below the bend 22. A water collection tank 200 for containing leaked coolant is provided on the bottom side of the drain pipe 100, and the water collection tank 200 is connected to the outlet 121 of the drain pipe 100 through a water inlet 210 at the top.

[0028] When coolant leaks from the fan water pipe 21, the coolant drips down into the drain pipe 100 and flows along the inner wall of the drain pipe 100. The drain pipe 100 guides the coolant, allowing it to flow out of the outlet 121 below the bend 22 and then into the water collection tank 200 through the inlet 210.

[0029] By adding a water collection tank 200 and a drainage pipe 100, the drainage pipe 100 diverts leaked coolant into the water collection tank 200, achieving active drainage protection against leakage. This improves the leak-proof effect of the frequency converter cabinet 20, prevents coolant from leaking out and damaging the electrical components inside the frequency converter cabinet 20, enhances the safety and reliability of the frequency converter cabinet 20's operation, and reduces downtime for maintenance caused by leakage. Furthermore, the simple structure of the water collection tank 200 and the drainage pipe 100 makes the leak-proof modification simple to operate and low in cost, while reducing unplanned downtime costs and equipment replacement costs caused by leakage, resulting in significant economic benefits.

[0030] In some embodiments provided in this application, such as Figure 1 , Figure 3 and Figure 4 As shown, the drainage pipe 100 includes a wrapping part 110 and a guide part 120. The wrapping part 110 is sleeved on the outside of the fan water pipe 21. One end of the guide part 120 is connected to the wrapping part 110, and the other end of the guide part 120 is provided with an outlet 121 that extends into the inlet 210. The guide part 120 is provided with an opening 122 for the fan water pipe 21 to pass through. There are two drainage pipes 100, and the two guide parts 120 are connected together.

[0031] In this embodiment, the top end of the guide section 120 communicates with the wrapping section 110 sleeved on the outside of the fan water pipe 21, and the bottom end of the guide section 120 extends downward into the inlet 210 to enter the water collection tank 200, so that part of the guide section 120 is located below the bend 22. The outlet 121 is located at the bottom end of the guide section 120, so that the guide section 120 communicates with the water collection tank 200, thereby allowing the coolant in the wrapping section 110 to flow into the water collection tank 200 through the guide section 120. The guide section 120 has an opening 122 on the side facing the bend 22 to avoid the fan water pipe 21, so that when the guide section 120 bends downward, the fan water pipe 21 can pass through the opening 122. Specifically, the opening 122 can extend to the end face of the guide section 120, or it can form a gap with the end face of the guide section 120.

[0032] By setting two drainage pipes 100, the processing and installation of the drainage pipes 100 are made more convenient, saving the process of drilling positioning holes in the drainage pipes 100. When processing the drainage pipes 100, only an opening 122 needs to be cut at one end of the pipe fitting to form the guide section 120. When installing the drainage pipes 100, the two wrapping parts 110 are respectively fitted onto both sides of the fan water pipe 21, so that the two guide sections 120 fit together, which makes it easy to adjust the position of the guide sections 120 according to the site conditions, making the installation of the drainage pipes 100 more flexible and accurate.

[0033] For example, the size of the inlet 210 is larger than the size of the outlet 121, so that a gap is formed between the outer wall of the guide section 120 and the inlet wall of the inlet 210, so that some of the leakage liquid that did not enter the guide section 120 can still enter the collection tank 200 through the gap when it flows down the outer wall of the guide section 120.

[0034] In some embodiments, such as Figure 2 As shown, there is one drainage tube 100, and the top end of the guide part 120 is located between the two ends of the wrapping part 110, so that the guide part 120 is connected to the middle position of the wrapping part 110.

[0035] In some embodiments provided in this application, such as Figure 1 and Figure 3 As shown, one of the two guide sections 120 is sleeved on the outside of the other guide section 120.

[0036] In this embodiment, when installing the drain pipe 100, two guide sections 120 are fitted together and are coaxial, making the connection between the two guide sections 120 more secure and the connection method simpler. Furthermore, compared to the method of arranging the two guide sections 120 adjacently, this reduces the seam between them, increasing the bearing area of ​​the drain pipe 100 below the fan water pipe 21 and preventing coolant leakage through the gap between the two guide sections 120, thus improving the leak-proof effect of the drain pipe 100.

[0037] In some embodiments provided in this application, the leak-proof device 10 further includes a fastener, and the fastener is circumferentially sleeved on the outer side of the guide portion 120.

[0038] In this embodiment, the fastener can be a pipe clamp, a cloth wrap, or tape. The fastener is wrapped around the outer periphery of the two guide portions 120 to make the connection of the guide portions 120 more secure. In addition, in order to facilitate the installation of the guide portions 120, the opening 122 of at least one guide portion 120 is usually extended to the end face. Wrapping the fastener can prevent leakage through the opening 122.

[0039] In some embodiments provided in this application, such as Figure 1 and Figure 3 As shown, the leak-proof device 10 also includes a shield 300, at least partially covering the portion of the fan water pipe 21 that extends out of the opening 122.

[0040] In this embodiment, when the guide section 120 bends downward, a portion of the fan water pipe 21 protrudes from the opening 122 and is exposed outside the drain pipe 100. The shielding member 300 can cover the exposed portion of the fan water pipe 21, making the coverage of the fan water pipe 21 more comprehensive, thereby ensuring the leak-proof effect. Furthermore, the shielding member 300 is made of the same material and color as the drain pipe 100, which can improve the overall aesthetics of the leak-proof device 10.

[0041] In some embodiments provided in this application, such as Figure 1 and Figure 3 As shown, the leak prevention device 10 also includes a liquid level detection element 410, which is installed in the water collection tank 200 and is used to obtain liquid level information in the water collection tank 200.

[0042] In this embodiment, a liquid level detection device 410 capable of acquiring liquid level information is provided in the water collection tank 200. The liquid level information includes the liquid level height, enabling the operator to grasp the liquid level situation in the water collection tank 200 and thus determine whether the fan water pipe 21 is leaking.

[0043] In some embodiments provided in this application, the leak prevention device 10 further includes a control device 500, which receives the leak signal and sends an alarm signal when the liquid level in the water collection tank 200 exceeds the trigger threshold.

[0044] In this embodiment, the liquid level detection element 410 can be a high-sensitivity liquid level sensor. The liquid level detection element 410 is installed on the inner wall of the water collection tank 200 and located at the bottom of the water collection tank 200. The control device 500 is communicatively connected to the liquid level detection element 410. The control device 500 can be a PLC (Programmable Logic Controller), or it can be the unit's main control device. The unit's main control device is connected to the plant monitoring device, enabling alarm signals to be pushed to the plant monitoring device via SCADA (Supervisory Control and Data Acquisition). When coolant flows into the water collection tank 200, the coolant level rises, triggering the liquid level detection element 410 at the bottom. The liquid level detection element 410 sends a leakage signal. After receiving the leakage signal, the control device 500 sends an alarm signal, thereby monitoring the leakage of the fan water pipe 21 in real time and promptly alerting staff when leakage abnormalities occur, facilitating timely maintenance by personnel. By combining proactive protection with intelligent monitoring, the reliability of leak prevention measures has been further improved, and the risk of leakage has been reduced.

[0045] For example, the trigger threshold can be 10 mm. The leak prevention device 10 also includes: an indicator light for flashing and / or a buzzer for emitting a buzzer, and a control device 500 for controlling the operation of the indicator light and the buzzer, wherein the alarm signal includes the indicator light flashing and / or the buzzer emitting a buzzer.

[0046] In some embodiments provided in this application, such as Figure 5 As shown, the leak prevention device 10 also includes a detection circuit 400, which includes a linkage switch 420, a coil 430, and an air switch 440. The two ends of the linkage switch 420 are respectively connected to the control device 500. The coil 430 is used to control the opening and closing state of the linkage switch 420. The two ends of the coil 430 are respectively connected to the first end of the liquid level detection element 410 and the power supply 450. The first end of the air switch 440 is connected to the power supply 450, and the second end of the air switch 440 is connected to the second end of the liquid level detection element 410.

[0047] In this embodiment, the operator can manually control the switching state of the air switch 440 to control the on / off state of the detection circuit 400. Furthermore, the air switch 440 provides overload and short-circuit protection for the detection circuit 400. The power supply 450 can be 230V. The coil 430 can be a relay coil, and the linkage switch 420 can be a single-pole double-throw switch; the coil 430 and the linkage switch 420 form a relay. One end of the linkage switch 420 is connected to the 24V power supply 450, and the other end is connected to the control device 500.

[0048] When no leakage occurs, the liquid level detection element 410 is in the connected state, the detection circuit 400 is conductive, the coil 430 is energized, and the linkage switch 420 is closed. In the event of leakage, the liquid triggers the liquid level detection element 410, causing it to disconnect. The detection circuit 400 disconnects, the coil 430 is de-energized, and the linkage switch 420 opens. Feedback is sent to the control device 500, which determines that a leak has occurred and sends an alarm signal. The detection circuit 400 is used to detect leaks and also to perform warning response tests after installation to simulate coolant leakage and verify the system's reliability.

[0049] In some embodiments provided in this application, the leak-proof device 10 further includes: a viewing window 220 and / or a magnetic element. The viewing window 220 is disposed on the wall of the water collection tank 200 and is used to view the internal condition of the water collection tank 200. The magnetic element is disposed on the outer wall of the water collection tank 200 and is used to detachably connect to the cabinet of the frequency converter cabinet 20.

[0050] In this embodiment, the water collection tank 200 is provided with a viewing window 220, which allows staff to see the water accumulation in the water collection tank 200 and check whether there is any leakage. This also helps determine whether there is any leakage in the fan water pipe 21, making it easier for staff to check for leaks during inspections. This avoids losses caused by delayed detection of leaks due to malfunctions of the liquid level detection device 410 or the control device 500, and enriches the means of leak monitoring.

[0051] The magnetic component can be a permanent magnet. The water collection tank 200 is magnetically attached to the cabinet of the frequency converter cabinet 20. Specifically, the water collection tank 200 can be located on the cabinet door. The water collection tank 200 is detachably connected to the cabinet via magnetic attachment, which improves the convenience of disassembling and assembling the water collection tank 200. After the water collection tank 200 collects leakage, the staff can easily disassemble the water collection tank 200 and reinstall the emptied and leaking water collection tank 200 on the cabinet.

[0052] A second aspect of this application provides a frequency converter cabinet 20, such as Figure 1 and Figure 2As shown, the frequency converter cabinet 20 includes: a fan water pipe 21 and a leak-proof device 10 provided in any of the above embodiments of the fan water pipe 21, wherein at least a portion of the drain pipe 100 of the leak-proof device 10 is sleeved on the outside of the fan water pipe 21.

[0053] In this embodiment, it should be noted that the frequency converter cabinet 20 is used for wind turbine units. Since the frequency converter cabinet 20 includes the anti-leakage device 10 provided in any of the above embodiments, it has all the beneficial technical effects of the anti-leakage device 10. To avoid repetition, it will not be described in detail here.

[0054] In one specific embodiment, the water collection tank 200, the drain pipe 100, and the liquid level detection device 410 are seamlessly integrated with the original structure of the unit, ensuring electrical insulation and mechanical stability. The water collection tank 200 can intercept more than 95% of leaked coolant, preventing direct dripping of liquid from the grid-side reactor and reducing the risk of equipment damage. Maintenance personnel can view alarm items in the SCADA system and prepare spare parts such as water pipes in advance, reducing the single maintenance time from 12 hours to 2 hours.

[0055] Taking 66 wind turbine units as an example, the economic benefits of the leak-proof device 10 in this application are calculated as follows:

[0056] I. Cost savings in operation and maintenance:

[0057] (1) Reduced cost of unplanned shutdown: Assuming each wind turbine experiences one unplanned shutdown per year due to leakage, with each shutdown lasting 30 hours, generating 1.5MW of electricity at a price of 0.45 yuan / kWh, the annual power generation loss per turbine due to unplanned shutdown would be: 1×30×1.5×1000×0.45=20250 yuan.

[0058] (2) Reduced equipment replacement costs: If the grid-side reactor burns out, the replacement cost is approximately 30,000 yuan; if other grid-connected components such as fuses and contactors are damaged, the replacement cost is approximately 10,000 yuan, totaling 40,000 yuan. Through the proactive protection and intelligent monitoring measures proposed in this plan, the risk of equipment damage can be effectively reduced, thus lowering equipment replacement costs. Assuming that damage to the grid-side reactor and related components can be avoided 8 times per year, then 320,000 yuan in equipment replacement costs can be saved annually.

[0059] Considering both the reduction in unplanned downtime costs and equipment replacement costs, the annual maintenance savings per unit are approximately 20,250 + 40,000 = 60,250 yuan. If all 66 wind turbines in the entire farm are upgraded, and assuming eight instances of grid-side reactor and related component failures are avoided annually, the annual maintenance savings would be approximately 60,250 × 8 = 482,000 yuan. Assuming a 20-year lifespan for the turbines, and with the remaining lifespan of the Yongfa Wind Farm turbines at 7 years, the cumulative maintenance savings over those 7 years would approach 482,000 × 7 = 3,374,000 yuan.

[0060] II. Estimated Cost of Overall Renovation:

[0061] Equipment procurement costs: The procurement costs for equipment such as water collection tanks (200), diversion pipes (100), and leakage detection sensors are approximately 500 yuan per unit. The total procurement cost for all 66 wind turbine units is approximately 500 × 66 = 33,000 yuan.

[0062] Installation and commissioning costs: The installation and commissioning cost for a single unit is approximately 100 yuan, and the installation and commissioning cost for all 66 wind turbine units is approximately 100 × 66 = 6600 yuan.

[0063] Total renovation cost: Including equipment purchase cost, installation and commissioning cost, and other costs, the total renovation cost is approximately 33,000 + 6,600 = 39,600 yuan.

[0064] The above calculations show that although the overall renovation requires a certain investment, in the long run, the annual savings in operation and maintenance costs far exceed the renovation costs, resulting in significant economic benefits.

[0065] In this utility model, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "join," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0066] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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 unit 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.

[0067] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] The above are merely some embodiments of this utility model and are not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A leak-proof device for a frequency converter cabinet, characterized in that, The frequency converter cabinet includes a fan water pipe, the fan water pipe includes a downwardly recessed bend, and the leak-proof device includes: A drain pipe, at least a portion of which is sleeved on the outside of the fan water pipe and located below the bend, has an outlet on it; A water collection tank is located below the drainage pipe. The top of the water collection tank has an inlet, and the outlet is connected to the inlet. The outlet is used to guide the liquid in the drainage pipe into the water collection tank.

2. The leak-proof device for the frequency converter cabinet according to claim 1, characterized in that, The drainage tube includes: The wrapping part is fitted onto the outside of the fan water pipe; The guide section has one end connected to the wrapping section, and the other end of the guide section is provided with the water outlet and extends into the water inlet. The guide section has an opening for the fan water pipe to pass through. The number of drainage tubes is two, and the two drainage sections are connected together.

3. According to claim 2 The leakage prevention device of the aforementioned frequency converter cabinet is characterized in that, One of the two flow guides is sleeved on the outside of the other flow guide.

4. The leak-proof device for the frequency converter cabinet according to claim 3, characterized in that, Also includes: Fasteners, which are circumferentially fitted onto the outer side of the guide portion.

5. The leak-proof device for the frequency converter cabinet according to claim 2, characterized in that, Also includes: A shield, at least partially covering the portion of the fan water pipe extending out of the opening.

6. The leakage prevention device for the frequency converter cabinet according to any one of claims 1 to 5, characterized in that, It also includes a detection circuit, the detection circuit comprising: A liquid level detection device is installed inside the water collection tank, and the liquid level detection device is used to obtain the liquid level information inside the water collection tank.

7. The leak-proof device for the frequency converter cabinet according to claim 6, characterized in that, Also includes: When the liquid level in the water collection tank exceeds a trigger threshold, the liquid level detection element sends a leakage signal. The control device receives the leakage signal and sends an alarm signal.

8. The leak-proof device for the frequency converter cabinet according to claim 7, characterized in that, The detection circuit further includes: A linkage switch, the two ends of which are respectively connected to the control device; A coil is used to control the opening and closing state of the linkage switch, and the two ends of the coil are respectively connected to the first end of the liquid level detection element and the power supply. An air switch, the first end of which is connected to the power supply, and the second end of which is connected to the second end of the liquid level detection element.

9. The leak-proof device for the frequency converter cabinet according to any one of claims 1 to 5, characterized in that, Also includes: A viewing window is provided on the wall of the water collection tank, and the viewing window is used to view the internal condition of the water collection tank; and / or A magnetic component is provided on the outer wall of the water collection tank, and the magnetic component is used for detachable connection with the cabinet of the frequency converter cabinet.

10. A frequency converter cabinet, characterized in that, include: Fan water pipe; The leak-proof device as described in any one of claims 1 to 9, wherein at least a portion of the drain pipe of the leak-proof device is sleeved on the outside of the fan water pipe.

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