Frequency converter liquid cooling system capable of being maintained on line

Abstract

The utility model provides a frequency converter liquid cooling system capable of being maintained on line, relates to the technical field of frequency converter cooling, and solves the problem that the reliability and maintenance convenience of an existing system cannot be guaranteed through an on-line maintenance mode. In the system, a power unit outlet end pipeline and a transformer outlet end pipeline are converged to form a first main pipeline section, the first main pipeline section arranged behind a degassing tank is divided into two pumping branches, and the two pumping branches are converged to form a second main pipeline section; the second section of the main pipeline is divided into two electric control branches, first outlets of the electric three-way valves of the two electric control branches are connected, converged and then connected to the corresponding heat exchangers, second outlets of the electric three-way valves and first outlets of the two heat exchangers are converged and then divided into two filtering branches again, and then converged to form a third section of the main pipeline; and the shunt is connected to the power unit and the transformer to form a complete loop. According to the utility model, on-line replacement without shutdown and alarm can be carried out when the system operates under rated working conditions, and the operation stability and reliability are improved.

Description

Technical Field

[0001] This utility model relates to the field of inverter cooling technology, specifically to an inverter liquid cooling system that can be maintained online. Background Technology

[0002] Inverters are widely used in industrial control, energy conversion, and electric drive, and their operational stability and reliability directly affect the normal operation of the entire system. To ensure the thermal management performance of inverters under high-load operation, liquid cooling systems are widely used as a key cooling method. Especially in applications with extremely high safety requirements, such as nuclear power, the continuous and stable operation of the inverter's liquid cooling system is particularly important.

[0003] Typically, liquid cooling systems need to have continuous heat exchange capabilities to ensure that the frequency converter remains within its suitable operating temperature range. For example, in nuclear power plants, the overhaul cycle for equipment is generally 1.5 years, which places demands on the liquid cooling system to operate continuously for extended periods. During this period, the liquid cooling system must maintain efficient and stable operation to prevent equipment malfunctions due to cooling failure.

[0004] However, liquid cooling systems consist of a variety of components, including but not limited to water pumps, heat exchangers, valves, sensors, and piping, most of which are critical components. Failure or malfunction of these critical components will directly affect the overall performance of the liquid cooling system, leading to inverter temperature runaway and, in severe cases, even unplanned tripping shutdowns, impacting the safe and stable operation of the entire system.

[0005] Currently, most liquid cooling systems lack online maintenance capabilities in their design. When a component fails, system shutdown for repair is often required, which not only affects system availability but also increases maintenance costs. This deficiency is particularly pronounced in environments where operation cannot be easily interrupted, such as nuclear power and chemical plants, where continuous production is crucial.

[0006] Therefore, it is necessary to propose a variable frequency drive (VFD) liquid cooling system that enables online replacement and maintenance of key components without interrupting system operation or affecting parameter monitoring. This system should possess higher redundancy and fault tolerance to improve overall operational reliability and maintenance convenience, meeting the dual demands of modern industry for continuous equipment operation and efficient maintenance. Utility Model Content

[0007] Based on the current state of the technology, the purpose of this invention is to address the limitations of existing inverter liquid cooling systems in ensuring reliability and ease of maintenance through online maintenance. Therefore, this invention proposes an inverter liquid cooling system capable of online maintenance. Through its piping structure and component design, this invention enables the online replacement of relevant instruments and critical components during rated operation without shutting down the system or triggering alarms, effectively improving the system's operational stability and reliability.

[0008] The present invention employs the following technical solution to achieve its objective:

[0009] An online maintainable inverter liquid cooling system is disclosed, wherein the components cooled by the system include power units and transformers. A main pipeline section is formed by the confluence of the power unit outlet pipe and the transformer outlet pipe, and a degassing tank is installed on this main pipeline section. The main pipeline section section downstream of the degassing tank branches into two pumping branches, each equipped with a main circulating water pump. These two pumping branches converge to form a second section of the main pipeline. The second section of the main pipeline branches into two electrically controlled branches, each connected to the inlet of a corresponding electrically operated three-way valve. After the first outlets of the electric three-way valves of the branch are connected and merged, they are split again into two heat exchange branches and connected to the first inlet of the corresponding heat exchanger. The second outlets of the two electric three-way valves and the first outlets of the two heat exchangers are equipped with corresponding valves and merge into the same pipeline. After merging, they are split again into two filter branches. Each filter branch is equipped with a filter. After the two filter branches merge, they form three sections of the main pipeline. After the three sections of the main pipeline are split into two return branches, they are connected to the inlet of the power unit and the inlet of the transformer, respectively, forming a complete loop.

[0010] Preferably, flow sensors are installed on both the power unit outlet pipeline and the transformer outlet pipeline; valves are installed on the pipelines before and after each flow sensor, and a first parallel pipeline is also installed at each flow sensor, with a valve also installed on the first parallel pipeline.

[0011] Preferably, a pressure sensor and a platinum resistance thermometer are installed on the first section of the main pipeline in front of the degassing tank; a pressure gauge is installed at the location before the second section of the main pipeline splits into two electrically controlled branches; a pressure gauge is also installed on the pipeline before the two filter branches are split after the second outlets of the two electric three-way valves and the first outlets of the two heat exchangers converge; a pressure gauge and two platinum resistance thermometers are also installed on the third section of the main pipeline; and a valve and two pressure sensors are installed on each of the two return branches after the third section of the main pipeline splits.

[0012] Preferably, two equipment bypasses are connected in parallel on the three sections of the main pipeline. The first equipment bypass is equipped with valves for entering and exiting the bypass, as well as dissolved oxygen and pH sensors. The second equipment bypass is equipped with valves for entering and exiting the bypass, as well as two conductivity sensors.

[0013] Preferably, the degassing tank is equipped with a heater, and the degassing tank is also connected to two expansion tanks. Each expansion tank is equipped with a corresponding valve on an independent pipeline connected to the degassing tank.

[0014] Preferably, the degassing tank is also connected to the alkali replenishment tank via an alkali replenishment pipeline. The alkali replenishment tank is equipped with a liquid level sensor, and the alkali replenishment pipeline is equipped with a dosing pump and valves.

[0015] Furthermore, a bypass connecting to the degassing tank is also installed on the three sections of the main pipeline; a manual three-way valve is installed on the bypass, the first inlet of which is connected to the three sections of the main pipeline, and a visual flow meter is installed on the outlet pipeline of the manual three-way valve, which then splits into two deionization branches. Each deionization branch is equipped with a deionization tank. After the two deionization branches merge, they split again into two second filtration branches, each equipped with a filter. After the two second filtration branches merge, they are connected to the degassing tank; a pressure gauge is also installed on the pipeline after the deionization tank of any deionization branch, or on the pipeline after the two deionization branches merge.

[0016] Preferably, the second inlet of the manual three-way valve is also connected to a water supply tank, and a liquid level sensor is installed on the water supply tank; a water supply pump, a pressure gauge and a filter are installed in sequence on the connecting pipeline between the water supply tank and the second inlet of the manual three-way valve, and valves are installed on the front and rear pipelines of the water supply pump.

[0017] Preferably, valves are installed on both the front and rear pipelines of the degassing tank; a second parallel pipeline is also installed at the pipeline containing the degassing tank and its front and rear valves, and valves are also installed on the second parallel pipeline.

[0018] Preferably, valves are installed at both the inlet and the first outlet of the two electric three-way valves.

[0019] In summary, due to the adoption of this technical solution, the beneficial effects of this utility model are as follows:

[0020] This invention optimizes the piping structure and component configuration, enabling online replacement of all instruments and key components without shutting down the system or triggering alarms under rated operating conditions. This design effectively overcomes the operational interruption problem caused by the need to shut down the system for maintenance when components fail or age in traditional liquid cooling systems, significantly improving the system's continuous operation capability.

[0021] Because key components are maintainable online, the system can maintain good heat exchange capacity and parameter control stability throughout long-term operation. This feature is particularly important in applications such as nuclear power, where continuous operation is critical. It helps prevent overall system performance degradation due to the failure of local components in the liquid cooling system, thus preventing serious consequences such as unplanned power outages.

[0022] Furthermore, this invention improves the reliability and operational efficiency of the liquid cooling system, enhancing its ability to respond to emergencies. Through a design concept that allows maintenance while the system is running, it not only reduces the impact of equipment maintenance on the production cycle but also minimizes resource waste and time loss caused by downtime for repairs. Overall, this system offers significant advantages in improving operational stability and ease of maintenance, meeting the dual demands of modern industry for high reliability and efficient operation and maintenance. Attached Figure Description

[0023] The present invention is further described in detail with reference to the following drawings, which include two figures as follows:

[0024] Figure 1 This is a schematic diagram of the structure of the inverter liquid cooling system of this utility model;

[0025] Figure 2 For the present utility model in Figure 1 Another example structural diagram optimized based on the original structure.

[0026] The meanings of the markings in the attached diagram are as follows:

[0027] Liquid cooling system controller - PLC; Valves - VXXX; Electric three-way valves - V005 and V030; Manual three-way valve - V601; Flow sensors - FIT01 and FIT02; Visual flow meter - FI11; Pressure sensors - PT01 to 05; Pressure gauges - PI01 to 05; Platinum resistance thermometers - TT01 to 04; Conductivity sensors - QIT01 and QIT02; pH sensor - PH01; Dissolved oxygen sensor - OI T01; Filters - Z01 to Z05; Expansion tanks - C11 and C12; Main circulating water pumps - P01 and P02; Makeup water pump - P03; Dosing pump - P04; Level sensors - LS01 and LS02; Leakage sensor - LDS01; Temperature and humidity sensor - TRT01; Heat exchanger - E01 and E02; Deionizer - CO1 and CO2; Alkali replenishment tank - C41; Degassing tank - C21; Makeup water tank - C31; Heater - H01. Detailed Implementation

[0028] 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, 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.

[0029] 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.

[0030] Example 1

[0031] A liquid cooling system for frequency converters that can be maintained online, the preferred structure of which can be found in [reference needed]. Figure 1 The illustration.

[0032] This embodiment first introduces the key framework of its overall structure. Firstly, the devices cooled by the system include power units and transformers. The outlet pipes of the power units and transformers converge to form a main pipeline section one, on which a degassing tank C21 is installed. The main pipeline section one, located behind the degassing tank C21, branches into two pumping branches, each equipped with a main circulating water pump P01 and P02. These two pumping branches converge to form a main pipeline section two. The main pipeline section two branches into two electrically controlled branches, each connected to the inlet of a corresponding electric three-way valve V005 or V030. The first outlets of the electric three-way valves V005 and V030 of the two electrically controlled branches are connected and merged. After the initial flow, the flow is split again into two heat exchange branches and connected to the first inlet of the corresponding heat exchangers E01 and E02. The second outlets of the two electric three-way valves V005 and V030, as well as the first outlets of the two heat exchangers E01 and E02, are each equipped with corresponding valves V006, V031, V011, and V013, and the flow converges into the same pipeline. After convergence, the flow is split again into two filtration branches, each equipped with filters Z01 and Z02. The two filtration branches converge to form three sections of the main pipeline. The three sections of the main pipeline are then split into two return branches, which are connected to the inlet of the power unit and the inlet of the transformer, respectively, forming a complete loop.

[0033] In addition to the core piping structure mentioned above, the system in this embodiment also involves components such as the temperature and humidity sensor TRT01, the liquid cooling system controller PLC, and the leakage sensor LDS01. These components belong to the same type as the various equipment and instruments in the system piping structure, but they are different in that they are not in contact with liquid and can be directly replaced online. The electrical control of the system is implemented by the corresponding electrical control cabinet and the controller PLC. Each node terminal in the electrical control cabinet uses a terminal with a fuse, and the PLC is designed with maintenance functions for various equipment and instruments. This allows all alarm functions of the sensor (such as ultra-low, low, high, ultra-high, and fault alarms) to be disabled when the status of equipment such as sensors is changed from normal to maintenance. This continues until the sensor is replaced and the corresponding maintenance switch controlled by the PLC is turned off. Only then will the switch status display return to normal, and all alarm functions of the sensor will be restored.

[0034] This embodiment will be based on the following... Figure 1 The diagram illustrates the detailed connection methods of the system piping structure. The power unit outlet piping is divided into two parallel lines. One line has a valve V027 (this is the first parallel line on the power unit side), and the other line, following the flow direction, has valve V025, flow sensor FIT02, and valve V026. These lines then merge with the transformer outlet piping to form a main pipeline section. Similarly, the transformer outlet piping is also divided into two parallel lines. One line has a valve V024 (this is the first parallel line on the transformer side), and the other line, following the flow direction, has valve V022, flow sensor FIT01, and valve V023. These lines then merge with the power unit outlet piping to form a main pipeline section.

[0035] A pressure sensor PT05 (connected to the first section of the main pipeline via valve V408), a platinum resistance thermometer TT03, and a degassing tank C21 are installed along the flow direction on the first section of the main pipeline. The degassing tank C21 is connected to a heater H01 and expansion tanks C11 (connected to the degassing tank C21 via valve V502) and C12 (connected to the degassing tank C21 via valve V503). The first section of the main pipeline then branches into two pumping branches. One branch is equipped with valve V028, pump P01, and valve V003 along the flow direction; the other branch is equipped with valve V029, pump P02, and valve V004 along the flow direction. The two pumping branches merge to form the second section of the main pipeline, which is equipped with a pressure gauge PI01 (connected to the second section of the main pipeline via valve V401) along the flow direction.

[0036] The second section of the main pipeline then branches into two electrically controlled branches, each equipped with a corresponding electric three-way valve, V005 and V030. The first outlets of these two valves merge and then branch again into two heat exchange branches, connecting to the first inlets of heat exchangers E01 and E02 respectively. Simultaneously, the second outlets of the two electric three-way valves, V005 and V030, are also connected to the first outlets of heat exchangers E01 and E02 for merging. A valve V007 is installed at the first inlet of heat exchanger E01, and a valve V011 is installed at its first outlet. A valve V009 is installed at the first inlet of heat exchanger E02, and a valve V013 is installed at its first outlet. A valve V006 is installed at the second outlet of electric three-way valve V005, and a valve V031 is installed at the second outlet of electric three-way valve V030.

[0037] Heat exchangers E01 and E02 also have their own corresponding second inlet and second outlet, which serve as the input and output of the remaining liquid circuits; valves V012 and V014 are installed at the second inlet of each, and valves V008 and V010 are installed at the second outlet; platinum resistance thermometers TT04 are also installed on the remaining liquid circuits.

[0038] The second outlets of the two electric three-way valves V005 and V030 merge with the first outlets of the two heat exchangers E01 and E02. Pressure gauge PI02 is installed according to the flow direction (connected to the pipeline at the installation location via valve V402). Then, the flow splits again into two filter branches: one branch is equipped with valve V015, filter Z01, and valve V016 according to the flow direction; the other branch is equipped with valve V017, filter Z02, and valve V018 according to the flow direction. The two filter branches merge to form the main pipeline in three sections.

[0039] Pressure gauge PI03 (connected to the main pipeline section three via valve V403), platinum resistance thermometers TT01 and TT02 are installed in accordance with the flow direction on the main pipeline section three. Two equipment bypasses are also connected in parallel on the main pipeline section three. The first equipment bypass is equipped with valve V901, dissolved oxygen sensor OIT01, pH sensor PH01, and valve V222 in accordance with the flow direction. The second equipment bypass is equipped with valve V040, conductivity sensors QIT01 and QIT02, and valve VO41 in accordance with the flow direction. The order and position of the two equipment bypasses on the main pipeline section three can be adjusted according to actual needs without additional restrictions.

[0040] The main pipeline then branches into two return branches, which connect to the power unit inlet and the transformer inlet respectively, forming a complete loop. On the power unit side, the return branch is equipped with valve V021, pressure sensor PT03 (connected to the pipeline on this side via valve V406), and pressure sensor PT04 (connected to the pipeline on this side via valve V407) according to the flow direction. On the transformer side, the return branch is equipped with valve V019, pressure sensor PT01 (connected to the pipeline on this side via valve V404), and pressure sensor PT02 (connected to the pipeline on this side via valve V405) according to the flow direction.

[0041] In this embodiment, a bypass connecting to the degassing tank C21 is also provided on the three sections of the main pipeline. The bypass is equipped with valve V101, manual three-way valve V601, and visual flow meter FI11 according to the flow direction, and then branches into two deionization branches. One branch is equipped with valve V433, deionization tank C01 (containing deionized resin), and valve V434 according to the flow direction; the other branch is equipped with valve V432, deionization tank C02 (containing deionized resin), and valve V431 according to the flow direction. A pressure gauge PIO5 is also provided in the pipeline downstream of deionization tanks C01 and C02 in any of the deionization branches, or in the pipeline where the two deionization branches converge. In this embodiment, pressure gauge PIO5 is located in the pipeline downstream of deionization tank C02, and it is connected to the corresponding deionization branch via valve V409.

[0042] After the two deionization branches merge, they split again into two second filtration branches. One branch is equipped with valve V435, filter Z03, and valve V438 according to the flow direction; the other branch is equipped with valve V437, filter Z04, and valve V439 according to the flow direction. The two second filtration branches are connected to the degassing tank C21 after merging.

[0043] The first inlet of the manual three-way valve V601 is connected to valve V101, and the outlet is connected to the visual flow meter FI11. The second inlet of the manual three-way valve V601 is also connected to a water supply tank C31, on which a level sensor LS01 is installed. On the connecting pipeline between the water supply tank C31 and the second inlet of the manual three-way valve V601, valve V216, water supply pump P03, valve V102, pressure gauge PI04 (which is connected to this pipeline through valve V410), and filter Z05 are installed according to the flow direction.

[0044] In this embodiment, the degassing tank C21 is also connected to the alkali replenishment tank C41 through the alkali replenishment pipeline. The alkali replenishment tank C41 is equipped with a liquid level sensor LS02, and the alkali replenishment pipeline is equipped with a dosing pump P04 and a valve V504 according to the flow direction.

[0045] Example 2

[0046] Based on Example 1, such as Figure 2As shown, this embodiment further optimizes and improves the system structure. A valve V043 is installed at the front end pipeline (i.e., the inlet) of the degassing tank C21, and a valve V044 is installed at the rear end pipeline (i.e., the outlet); subsequently, a second parallel pipeline is also installed in the pipeline containing the degassing tank C21 and its front and rear valves V043 and V044, and a valve V402 is installed on the second parallel pipeline.

[0047] Meanwhile, valve V045 is installed at the inlet of electric three-way valve V005, and valve V046 is installed at its first outlet; valve V047 is installed at the inlet of electric three-way valve V030, and valve V048 is installed at its first outlet.

[0048] Based on the structural characteristics of the above system, the mechanical replacement aspect is described in this embodiment as follows:

[0049] Heater H01, conductivity sensors QIT01 and QIT02, and flow sensors FIT01 and FIT02 can all be replaced online by setting a bypass. Pressure sensors PT01 to 05 and pressure gauges PI01 to 05 can all be replaced online via valves connected to the pipeline. Makeup pump P03, dosing pump P04, alkali replenishment tank C41, visual flow meter FI11, pH sensor PH01, dissolved oxygen sensor OIT01, and level sensors LS01 and LS02 can all be replaced online via valves before and after the pipeline. Platinum resistance thermometers TT01 to 04 can be replaced by removing the core, or online by setting a bypass. The main circulating water pumps P01 and P02, heat exchangers E01 and E02, deion tanks C01 and C02, filters Z01 to Z04, and electric three-way valves V005 and V030 are all configured with two of each, so that one is in operation and the other is on standby, and valves are installed before and after each component for online replacement.

[0050] Example 3

[0051] Based on the above embodiments, this embodiment specifically describes the maintenance of relevant components.

[0052] When the flow sensor FIT01 needs maintenance or replacement, first put the sensor in maintenance mode in the electrical control cabinet, then open valve V024 and close valves V022 and V023. At this time, the flow sensor FIT01 can be maintained or replaced online. The same applies to the flow sensor FIT02.

[0053] When the actuator M001 of the electric three-way valve V005 needs maintenance or replacement, first put this component into maintenance mode in the electrical control cabinet. Then, adjust the status of another electric three-way valve V030 to be consistent with the status of the electric three-way valve V005 that needs maintenance. Open valve V031 and close valve V006. At this time, online maintenance or replacement of the actuator M001 of the electric three-way valve V005 can be performed. The same applies to the actuator M002 of the other electric three-way valve V030.

[0054] When the visual flow meter FI11 needs maintenance or replacement, this component is not connected to the PLC and can be directly isolated from the liquid cooling system. Adjust the arrow of the manual three-way valve V601 to point only to valve V101 and filter Z05, and close valves V433 and V432. At this time, the visual flow meter FI11 can be maintained or replaced online.

[0055] When pressure sensor PT01 needs maintenance or replacement, first put the sensor into maintenance mode in the electrical control cabinet, and then close valve V404. At this time, pressure sensor PT01 can be maintained or replaced online. The same applies to other pressure sensors PT02 to PT05.

[0056] When pressure gauge PI01 needs maintenance or replacement, this component is not connected to the PLC. Close valve V401. At this time, pressure gauge PI01 can be maintained or replaced online. The same applies to other pressure gauges PI02 to PI05.

[0057] When the platinum resistance thermometer TT01 needs maintenance or replacement, first put this sensor into maintenance mode in the electrical control cabinet. This component can be maintained or replaced online by replacing the inner core. The same applies to other platinum resistance thermometers TT02 to TT04.

[0058] When the conductivity sensor QIT01 needs maintenance or replacement, first put the sensor in maintenance mode in the electrical control cabinet, and then close valves V041 and V040. At this time, the conductivity sensor QIT01 can be maintained or replaced online. The same applies to the conductivity sensor QIT02.

[0059] When the pH sensor PH01 needs maintenance or replacement, first put the sensor in maintenance mode in the electrical control cabinet, and then close valves V222 and V901. At this time, the pH sensor pH01 can be maintained or replaced online.

[0060] When the dissolved oxygen sensor OIT01 needs maintenance or replacement, first put the sensor into maintenance mode in the electrical control cabinet, and then close valves V222 and V901. At this time, the dissolved oxygen sensor OIT01 can be maintained or replaced online.

[0061] When filter Z01 requires maintenance or replacement, and this component is not connected to the PLC, first open valves V018 and V017, then close valves V016 and V015. At this point, online maintenance or replacement of filter Z01 can be performed. The same applies to filters Z02 to Z04. When filter Z05 requires maintenance or replacement, adjust the manual three-way valve V601 so that the arrow points only to valve V101 and the visual flow meter FI11, and then perform maintenance or replacement.

[0062] When expansion tank C11 needs maintenance or replacement, since this component is not connected to the PLC, first open valve V503 and then close valve V502. At this time, online maintenance or replacement of expansion tank C11 can be performed. The same applies to expansion tank C12.

[0063] When the main circulating water pump P01 needs maintenance or replacement, first confirm that valves V029 and V004 are open. In the electrical control cabinet, switch the running water pump from P01 to P02. Disconnect the power supply to P01 and then close valves V028 and V003. At this time, the main circulating water pump P01 can be maintained or replaced online. The same applies to the main circulating water pump P02.

[0064] When the water supply pump P03 needs maintenance or replacement, first ensure that the manual three-way valve V601 is adjusted so that the arrow points only to valve V101 and the visual flow meter FI11. Then disconnect the power supply to P03 in the electrical control cabinet. At this time, the water supply pump P03 can be maintained or replaced online.

[0065] When the dosing pump P04 needs maintenance or replacement, first close valve V504, and then disconnect the power supply to the dosing pump P04 in the electrical control cabinet. At this time, the dosing pump P04 can be maintained or replaced online.

[0066] When the level sensor LS01 needs maintenance or replacement, first put the sensor into maintenance mode in the electrical control cabinet, and then perform online maintenance or replacement of the level sensor LS01. The same applies to the level sensor LS02.

[0067] When the leak sensor LDS01 or the temperature and humidity sensor TRT01 needs maintenance or replacement, and these two sensors are not connected to liquid, first put the sensor into maintenance mode in the electrical control cabinet, and then perform online maintenance or replacement of the leak sensor LDS01 or the temperature and humidity sensor TRT01.

[0068] When heat exchanger E01 needs maintenance or replacement, first confirm that valves V009, V010, V013, and V014 are open, and then close valves V007, V008, V011, and V012. At this time, heat exchanger E01 can be maintained or replaced online. The same applies to heat exchanger E02.

[0069] When deionizer C01 needs maintenance or replacement, first confirm that valves V431 and V432 are open, and then close valves V433 and V434. At this time, online maintenance or replacement of deionizer C01 can be performed. The same applies to deionizer C02.

[0070] When the water supply tank C31 needs maintenance or replacement, first close valve V216. At this time, the water supply tank C31 can be maintained or replaced online.

[0071] When the degassing tank C21 or heater H01 needs maintenance or replacement, first disconnect the power supply to heater H01 in the electrical control cabinet, open valve V042, and close valves V043, V044, V502, and V503. At this time, online maintenance or replacement of degassing tank C21 or electric heater H01 can be performed.

[0072] When electric three-way valve V005 needs maintenance or replacement, first put this sensor in maintenance mode in the electrical control cabinet, then adjust the state of electric three-way valve V030 to be consistent with the state of electric three-way valve V005, then open valves V031, V047, and V048, and close valves V006, V045, and V046. At this time, online maintenance or replacement of electric three-way valve V005 can be performed, and the same applies to electric three-way valve V030.

[0073] In summary, this utility model, with its cooling function, allows for the online replacement of all components and instruments in the system—including conductivity sensors, pH sensors, dissolved oxygen sensors, flow sensors, platinum resistance thermometers, pressure sensors, pressure gauges, level sensors, temperature and humidity sensors, visual flow meters, and important components such as degassing tanks, main circulating water pumps, heat exchangers, deionization tanks, filters, makeup water pumps, dosing pumps, alkali replenishment tanks, and heaters—without shutting down the system or triggering alarms while the liquid cooling system is operating under rated conditions.

Claims

1. An online maintainable inverter liquid cooling system, wherein the components cooled by the system include power units and transformers; characterized in that: The main pipeline is formed by the confluence of the power unit outlet pipeline and the transformer outlet pipeline, and a degassing tank (C21) is installed on the main pipeline. The main pipeline branching off from the degassing tank (C21) into two pumping branches, each equipped with a main circulating water pump (P01, P02), forms the second section of the main pipeline. The second section of the main pipeline branches into two electrically controlled branches, each connected to the inlet of a corresponding electric three-way valve (V005, V030). The first outlets of the electric three-way valves (V005, V030) of the two electrically controlled branches are connected and converged, then further branched into two... The hot branch is connected to the first inlet of the corresponding heat exchanger (E01, E02); the second outlet of the two electric three-way valves (V005, V030) and the first outlet of the two heat exchangers (E01, E02) are each equipped with corresponding valves (V006, V031, V011, V013) and converge into the same pipeline. After convergence, the flow is split into two filter branches, each equipped with a filter (Z01, Z02). The two filter branches converge to form three sections of the main pipeline. The three sections of the main pipeline are split into two return branches, which are connected to the inlet of the power unit and the inlet of the transformer, respectively, forming a complete loop.

2. The inverter liquid cooling system according to claim 1, characterized in that: Flow sensors (FIT01, FIT02) are installed on the outlet pipeline of the power unit and the outlet pipeline of the transformer. Valves (V022, V023, V025, V026) are installed on the pipelines before and after each flow sensor (FIT01, FIT02). At the same time, a first parallel pipeline is also installed at each flow sensor (FIT01, FIT02), and valves (V024, V027) are also installed on the first parallel pipeline.

3. The inverter liquid cooling system according to claim 1, characterized in that: A pressure sensor (PT05) and a platinum resistance thermometer (TT03) are installed on the first section of the main pipeline in front of the degassing tank (C21); a pressure gauge (PI01) is installed at the point before the second section of the main pipeline splits into two electrically controlled branches; a pressure gauge (PI02) is also installed on the pipeline before the two filter branches are split after the second outlets of the two electric three-way valves (V005, V030) and the first outlets of the two heat exchangers (E01, E02) converge; a pressure gauge (PI03) and two platinum resistance thermometers (TT01, TT02) are also installed on the third section of the main pipeline; valves (V019, V021) and two pressure sensors (PT01, PT02, PT03, PT04) are installed on the two return branches after the third section of the main pipeline splits.

4. The inverter liquid cooling system according to claim 1, characterized in that: Two equipment bypasses are connected in parallel on the three sections of the main pipeline. The first equipment bypass is equipped with valves (V901, V222) for entering and exiting the bypass, as well as a dissolved oxygen sensor (OIT01) and a pH sensor (PH01). The second equipment bypass is equipped with valves (V040, V041) for entering and exiting the bypass, as well as two conductivity sensors (QIT01, QIT02).

5. The inverter liquid cooling system according to claim 1, characterized in that: A heater (H01) is installed on the degassing tank (C21). The degassing tank (C21) is also connected to two expansion tanks (C11, C12). Each expansion tank (C11, C12) is connected to the degassing tank (C21) by an independent pipeline with a corresponding valve (V502, V503).

6. The inverter liquid cooling system according to claim 1, characterized in that: The degassing tank (C21) is also connected to the alkali replenishment tank (C41) via an alkali replenishment pipeline. The alkali replenishment tank (C41) is equipped with a liquid level sensor (LS02), and the alkali replenishment pipeline is equipped with a dosing pump (P04) and a valve (V504).

7. The inverter liquid cooling system according to claim 1, characterized in that: The main pipeline is also equipped with a bypass connecting to the degassing tank (C21). A manual three-way valve (V601) is installed on the bypass. The first inlet of the manual three-way valve (V601) is connected to the main pipeline. A visual flow meter (FI11) is installed on the outlet pipeline of the manual three-way valve (V601), and then it splits into two deionization branches. Each deionization branch is equipped with a deionization tank (C01, C02). After the two deionization branches merge, they split into two second filtration branches. Each second filtration branch is equipped with a filter (Z03, Z04). After the two second filtration branches merge, they are connected to the degassing tank (C21). A pressure gauge (PIO5) is also installed on the pipeline after the deionization tank (C01, C02) of any deionization branch, or on the pipeline after the two deionization branches merge.

8. The inverter liquid cooling system according to claim 7, characterized in that: The second inlet of the manual three-way valve (V601) is also connected to a water supply tank (C31), and a level sensor (LS01) is installed on the water supply tank (C31). On the connecting pipeline between the water supply tank (C31) and the second inlet of the manual three-way valve (V601), a water supply pump (P03), a pressure gauge (PI04) and a filter (Z05) are installed in sequence. Valves (V216, V102) are installed on the front and rear pipelines of the water supply pump (P03).

9. The inverter liquid cooling system according to claim 1, characterized in that: Valves (V043, V044) are installed on both the front and rear pipelines of the degassing tank (C21); a second parallel pipeline is also installed at the pipeline containing the degassing tank (C21) and its front and rear valves (V043, V044), and a valve (V042) is also installed on the second parallel pipeline.

10. The inverter liquid cooling system according to claim 1, characterized in that: Valves (V045, V046, V047, V048) are installed at the inlet and first outlet of the two electric three-way valves (V005, V030).

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