A frequency converter with a water-cooling module and a water-cooling method

Abstract

This invention relates to a frequency converter with a water-cooling module and a water-cooling method, belonging to the field of high-voltage frequency converter technology. It includes: a heat exchange channel disposed above the frequency converter unit cabinet and the cooling unit cabinet; several cooling pools spaced apart inside the cooling unit cabinet; several heat exchange rods passing through the heat exchange channel and the frequency converter unit cabinet, the heat exchange rods being filled with composite phase change filler, one end of the heat exchange rods being thermally connected to the heat-generating electrical components inside the frequency converter unit cabinet, and the end of the heat exchange rods entering the heat exchange channel being connected to the cooling pools for liquid cooling circulation; a circulation pump is connected between the heat exchange rods and the cooling pools. This invention solves the technical problem of the lack of a relatively safe and low-energy-consumption cooling method for high-voltage frequency converters in existing technologies.

Description

Technical Field

[0001] This invention belongs to the field of high-voltage frequency converter technology, and specifically relates to a frequency converter with a water-cooling module and a water-cooling method. Background Technology

[0002] Heat dissipation is crucial for ensuring the safe, efficient, and long-life operation of high-voltage frequency converters. The root cause of heat generation is the energy loss of power devices and circuit components. An effective heat dissipation system can not only prevent component failure due to high temperatures but also improve the reliability and stability of the equipment. Traditional cooling technologies often use air cooling and liquid cooling. However, air cooling has poor heat dissipation capacity and cannot meet the heat dissipation requirements of high-voltage frequency converters. When using liquid cooling, the piping layout, condensate, and impact on electrical components also increase the difficulty of its use.

[0003] A patent with publication number CN214046488U discloses a high-efficiency, low-noise air-water cooling device for high-voltage frequency converters. The device includes an electrical room where the high-voltage frequency converter is installed. Below the electrical room are an underground air distribution chamber, an underground cooling chamber, and an underground water tank. A first cold air duct is installed at the air outlet of the underground cooling chamber. A second cold air duct is installed above the underground water tank. A first fan is installed inside the first cold air duct, and a second fan is installed inside the second cold air duct. This invention employs a closed-loop cooling method, placing the high-voltage frequency converter in a sealed electrical room and the fans in underground cold air ducts. This effectively addresses the impact of the outdoor environment on the high-voltage frequency converter, improves sound insulation, and reduces noise levels. Simultaneously, a temperature sensor controls the fan speed, accelerating hot air circulation, and the underground cooling chamber and underground water tank further cool the hot air.

[0004] The existing technology has the following drawbacks:

[0005] Air-water cooling is used to cool the electrical room of the high-voltage frequency converter by introducing cold air. However, the air is humid, and condensation will form on non-heating parts such as cabinets or ceilings when the cold air enters the electrical room. The dripping and accumulation of condensation will adversely affect the operation of the high-voltage frequency converter. Even if desiccant is added to the air circulation, condensation will still occur if the desiccant is not replaced in time. At the same time, the specific heat capacity of air is relatively low, and a large amount of air needs to be transported by a high-power fan. Therefore, the existing technology lacks a relatively safe and low-energy-consumption cooling method for high-voltage frequency converters. Summary of the Invention

[0006] This invention provides a frequency converter with a water-cooling module and a water-cooling method, which can solve the technical problem that the prior art lacks a relatively safe and low-energy-consumption cooling method for high-voltage frequency converters.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0008] This application provides a frequency converter with a water-cooled module, including a frequency converter unit cabinet and a cooling unit cabinet, which further includes:

[0009] A heat exchange channel is located above the inverter unit cabinet and the cooling unit cabinet;

[0010] Several cooling pools are spaced apart inside the cooling unit cabinet;

[0011] Several heat exchange rods are inserted between the heat exchange channel and the inverter unit cabinet. The heat exchange rods are filled with composite phase change filler. One end of the heat exchange rod is thermally connected to the heat-generating electrical components in the inverter unit cabinet. The end of the heat exchange rod that enters the heat exchange channel is connected to the liquid cooling circulation of the cooling pool. A circulation pump is connected between the heat exchange rod and the cooling pool.

[0012] The above technical solution uses heat exchange rods and composite phase change packing as heat transfer relays, which prevents low-temperature coolant from entering the inverter unit cabinet, improves the operating safety of the inverter, and eliminates the need for additional high-power equipment in addition to conventional coolant circulation power, thus reducing energy consumption.

[0013] In this invention, the heat exchange rod described above has the following characteristics:

[0014] The heat exchange section is located at one end where the heat exchange rod passes through the inverter unit cabinet;

[0015] A covering layer is connected between the heat exchange section and the heating electrical component, and the covering layer is in contact with the heating electrical component;

[0016] A cooling section is located at one end of the heat exchange rod that penetrates the heat exchange channel;

[0017] A liquid pipe, spirally arranged within the cooling section, is connected to the cooling pool.

[0018] The above technical solution uses a coating layer to increase the contact area between the heat exchange rod and the heating electrical element, thereby improving the heat transfer efficiency.

[0019] In this invention, the above-mentioned composite phase change filler is a paraffin-graphene composite filler.

[0020] The above technical solution uses paraffin-graphene composite filler as a phase change filler, which has higher latent heat and heat storage density, as well as strong thermal conductivity.

[0021] In this invention, the aforementioned coating layer is a thermosetting thermally conductive and insulating composite material.

[0022] The above technical solution uses a thermosetting thermally conductive and insulating composite material wrapping layer, which is more convenient for plastic wrapping installation at room temperature, and provides stable connection performance after high-temperature curing after operation and heat generation.

[0023] In this invention, the cooling pool further includes:

[0024] The pool is filled with cooling water;

[0025] A cooling pipe has a second liquid inlet, a third liquid outlet, a cooling section, and a second liquid outlet. The cooling section is inserted into the pool body and is submerged in the cooling water. The third liquid outlet is connected to the liquid pipe or to the second liquid inlet of another cooling pool. The second liquid outlet is connected to the liquid pipe.

[0026] A thermoelectric generator is connected between the second liquid inlet and the pool body, and the thermoelectric generator generates electricity based on the temperature difference between the second liquid inlet and the pool body;

[0027] A logic solenoid valve is connected between the second liquid inlet and the cooling section;

[0028] When there is a temperature difference between the second liquid inlet and the pool body, the thermoelectric generator generates electricity to keep the logic solenoid valve open.

[0029] When there is no temperature difference between the second liquid inlet and the pool body, the thermoelectric generator is de-energized, keeping the logic solenoid valve closed.

[0030] By using the above technical solution, a thermoelectric generator is used as the unit to determine whether the cooling pool is in use, which avoids the heated coolant from entering the already high-temperature cooling pool and causing it to fail to cool down, thus improving the reliability of the entire cooling system.

[0031] In this invention, the cooling pipe is connected to the liquid pipe and the circulation pump to form a closed circulating liquid circuit. The closed circulating liquid circuit is filled with coolant, which is a mixture of water-based sodium gluconate and aminotrimethylenephosphonic acid.

[0032] By adopting the above technical solution, using a closed circulating fluid circuit and filling it with a mixture of water-based sodium gluconate and aminotrimethylene phosphonic acid, the risk of coolant corrosion to pipelines and coolant acidification is reduced, the anti-scaling ability of the circulating fluid circuit is improved, and the maintenance requirements of the coolant circulating fluid circuit are reduced.

[0033] In this invention, the cooling pool further includes:

[0034] A liquid replenishment port is located at the top of the pool body and is used to connect to an external water source;

[0035] A drain outlet is located at the bottom of the pool body and is used to connect to a wastewater pool;

[0036] When the thermoelectric generator is not generating electricity, the replenishment port pumps in external water, and the drain port discharges the cooling water from the cooling pool.

[0037] By using the above technical solution, the cooling water in the cooling pool can be replaced by an external water source. When the cooling water fails to achieve a cooling effect due to temperature rise, it can be quickly replaced, thus improving self-maintenance performance.

[0038] This application also provides a water-cooling method for a frequency converter with a water-cooling module, which uses the above-mentioned frequency converter with a water-cooling module and further includes the following steps:

[0039] Step S10: The heating electrical component is plastically covered with the coating layer. After the heating electrical component heats up during operation, the coating layer is cured. The heat emitted by the heating electrical component is transferred through the coating layer to the composite phase change filler for storage.

[0040] Step S20: Start the circulation pump to make the closed circulation liquid flow, pump the coolant in the cooling pipe into the liquid pipe, and remove the heat in the composite phase change packing through the liquid pipe;

[0041] Step S30: The heated coolant is circulated back into the cooling pipe and flows into the cooling pool, where the cooling water cools the coolant in the cooling section.

[0042] The above technical solution employs a triple heat exchange system of water cooling, liquid cooling, and phase change materials to separate the cold source and the heat source, which not only improves the safety of the operating environment of electrical components but also reduces the maintenance costs of different heat exchange systems.

[0043] In this invention, the method further includes the following after step S30:

[0044] Step S40: When the temperature of the cooling water is equal to the temperature of the coolant in the second inlet, the thermoelectric generator is de-energized, the logic solenoid valve is closed, and the heated coolant flows into another cooling pool through the third outlet for circulation.

[0045] The above technical solution uses a thermoelectric generator to switch on and off a single cooling pool, allowing multiple cooling pools to circulate and cool the closed-loop liquid circuit, thus improving the continuity of cooling.

[0046] In this invention, the method further includes the following step after step S40:

[0047] Step S50: When the logic solenoid valve is closed, the external water source is introduced into the liquid replenishment port, and the heated cooling water is discharged from the liquid drain port.

[0048] By employing the above technical solution and actively replacing the water after the cooling pool is shut down, the efficiency of restarting the cooling pool after overheating is improved. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 A plan view of a frequency converter with a water-cooling module provided in an embodiment of the present invention;

[0051] Figure 2 A liquid circuit diagram of a water-cooling module for a frequency converter with a water-cooling module is provided for an embodiment of the present invention;

[0052] Figure 3 This is an isometric view of the heat exchanger provided in an embodiment of the present invention;

[0053] Figure 4 A side view of a heat exchange rod provided in an embodiment of the present invention;

[0054] Figure 5 for Figure 4 Sectional view at point AA;

[0055] Figure 6 An isometric view of the cooling pool provided in an embodiment of the present invention;

[0056] Figure 7 A side view of the cooling pool provided in an embodiment of the present invention;

[0057] Figure 8 for Figure 7 Sectional view at point BB.

[0058] Icons: 1-Heat exchanger rod; 101-Extension cylinder; 102-Cooling section; 103-Heat exchange section; 104-Covering layer; 105-Liquid pipe; 1051-First liquid inlet; 1052-First liquid outlet; 106-Composite phase change packing; 107-Buffer zone; 2-Circulating pump; 3-Cooling pool; 301-Pool body; 302-Cooling pipe; 3021-Second liquid inlet; 3022-Third liquid outlet; 3023-Cooling section; 3024-Second liquid outlet; 303-Thermoelectric generator; 304-Logic solenoid valve; 305-Liquid replenishment port; 306-Drainage port; 4-Inverter unit cabinet; 5-Cooling unit cabinet; 6-Heat exchange channel; 7-External water source; 8-Wastewater pool. Detailed Implementation

[0059] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0060] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0061] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0062] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to welding, bolting, or riveting; they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] Example:

[0064] Please refer to Figures 1 to 8 , Figures 1 to 8 The image shown is an embodiment of this application.

[0065] This embodiment provides a frequency converter with a water-cooling module, including a frequency converter unit cabinet 4 and a cooling unit cabinet 5, which further includes:

[0066] The heat exchange channel 6 is located above the inverter unit cabinet 4 and the cooling unit cabinet 5;

[0067] Three cooling pools 3 are spaced apart inside the cooling unit cabinet 5;

[0068] Six heat exchange rods 1 are connected between the heat exchange channel 6 and the inverter unit cabinet 4. The heat exchange rods 1 are filled with composite phase change filler 106. One end of the heat exchange rod 1 is thermally connected to the heat-generating electrical components in the inverter unit cabinet 4. The end of the heat exchange rod 1 that enters the heat exchange channel 6 is connected to the cooling pool 3 for liquid cooling circulation. A circulation pump 2 is connected between the heat exchange rod 1 and the cooling pool 3.

[0069] like Figure 1 and Figure 3 As shown, the heat exchange rod 1 has an extension tube 101. By changing the extension tube 101 of different lengths, the insertion depth of the heat exchange rod 1 in the inverter unit cabinet 4 can be adapted to ensure that it can be correctly connected to the heating electrical components. At the same time, the extension tube 101 can be a straight tube or a curved custom tube shape according to the arrangement of the heating electrical components.

[0070] It should be noted that, if necessary, cooling unit cabinet 5 and inverter unit cabinet 4 can be installed separately or with thermal insulation. Figure 1 This is only a layout diagram and does not mean that it must be installed close to the device. The significant difference between the technical solution of this embodiment and the traditional cooling method is that it abandons the traditional understanding that the cold source needs to be directly introduced to the heat-generating electrical components for cooling. Instead, it innovatively uses phase change materials to conduct the heat of the heat-generating electrical components out and contact the cold source in the independent space of the heat exchange channel 6, thus avoiding the generation of condensate in the inverter unit cabinet 4.

[0071] By using the above technical solution, heat exchange rod 1 is adopted and composite phase change packing 106 is used as a heat relay to prevent low temperature coolant from entering the inverter unit cabinet 4, thereby improving the operating safety of the inverter. In addition, no additional high-power equipment is required besides the conventional coolant circulation power, thus reducing energy consumption.

[0072] As a preferred implementation method, such as Figures 3 to 5 As shown, the heat exchange rod 1 described above has:

[0073] The heat exchange section 103 is located at one end of the heat exchange rod 1 that passes through the inverter unit cabinet 4;

[0074] The covering layer 104 is connected between the heat exchange section 103 and the heating electrical component, and the covering layer 104 is in contact with the heating electrical component;

[0075] Cooling section 102 is located at one end of heat exchange rod 1 that enters heat exchange channel 6;

[0076] The liquid pipe 105 is spirally installed inside the cooling section 102 and is connected to the cooling pool 3, as detailed below. Figure 2 , Figure 4 and Figure 8 As shown, the first liquid outlet 1052 is connected to the second liquid inlet 3021 of the uppermost cooling pool 3, and the first liquid inlet 1051 is connected to the second liquid outlet 3024.

[0077] The cooling section 102 is constructed by pre-embedding and casting liquid pipes 105. Both the heat exchange section 103 and the cooling section 102 are threadedly connected to the extension cylinder 101. Thermally conductive silicone grease is applied to the threads during threaded connection. During assembly, solid composite phase change filler 106 is pre-filled into the extension cylinder 101, the cooling section 102, and the heat exchange section 103. It should be noted that... Figure 5 As shown, when the composite phase change packing 106 melts, a buffer zone 107 is formed in the heat exchange rod 1 to accommodate the thermal expansion of the composite phase change packing 106.

[0078] The above technical solution uses a coating layer 104 to increase the contact area between the heat exchange rod 1 and the heating electrical element, thereby improving the heat transfer efficiency.

[0079] As a preferred embodiment, the composite phase change filler 106 is a paraffin-graphene composite filler.

[0080] For example, adding 5% by weight of graphene nanosheets to paraffin wax can help prevent the oxidative decomposition of paraffin wax at high temperatures (pure paraffin wax will experience carbon chain breakage after long-term use above 120°C). Paraffin wax is a non-polar organic compound, and graphene is an inert carbon material; neither reacts electrochemically with the copper pipe, eliminating the need for an additional anti-corrosion coating. Compared to traditional heat pipes using water or ammonia as the phase change material, the paraffin-graphene composite filler (5% by weight of graphene) has a higher thermal conductivity (approximately 1.5 W / m·K - 3.0 W / m·K) and a higher latent heat of phase change (approximately 180 kJ / kg - 220 kJ / kg). It is important to note that when adding graphene nanosheets to paraffin wax, the dispersibility of the graphene must be carefully considered. Ultrasonic-assisted blending may be necessary to prevent agglomeration that could lead to uneven thermal conductivity. A thermal conductivity test should be conducted on the filler before filling.

[0081] The above technical solution uses paraffin-graphene composite filler as a phase change filler, which has higher latent heat and heat storage density, as well as strong thermal conductivity.

[0082] In a preferred embodiment, the aforementioned coating layer 104 is a thermosetting thermally conductive and insulating composite material.

[0083] An example is the use of epoxy-imidazolium + 20% boron nitride + 30% aluminum oxide. , The curing initiation temperature is 40-50 degrees Celsius. It is plastic at room temperature. When the temperature is raised above 40 degrees Celsius, the imidazole ring opens and initiates cross-linking of the epoxy group, forming a three-dimensional network for curing. The plate-like hexagonal boron nitride forms a thermally conductive pathway in the resin. By adjusting the ratio of boron nitride to alumina, room temperature plasticity can be maintained while the surface thermal conductivity can be improved.

[0084] The above technical solution uses a thermosetting thermally conductive and insulating composite material wrapping layer, which is more convenient for plastic wrapping installation at room temperature, and provides stable connection performance after high-temperature curing after operation and heat generation.

[0085] As a preferred implementation method, such as Figures 6 to 8 As shown, the cooling pool 3 also includes:

[0086] Pool 301 is filled with cooling water;

[0087] Cooling pipe 302 has a second liquid inlet 3021, a third liquid outlet 3022, a cooling section 3023 and a second liquid outlet 3024. Cooling section 3023 is installed in pool body 301 and is submerged in cooling water. The third liquid outlet 3022 is connected to liquid pipe 105 or to the second liquid inlet 3021 of another cooling pool 3. The second liquid outlet 3024 is connected to liquid pipe 105.

[0088] Thermoelectric generator 303 is connected between the second liquid inlet 3021 and the pool body 301. Thermoelectric generator 303 generates electricity based on the temperature difference between the second liquid inlet 3021 and the pool body 301.

[0089] The logic solenoid valve 304 is connected between the second liquid inlet 3021 and the cooling section 3023;

[0090] When there is a temperature difference between the second liquid inlet 3021 and the pool body 301, the thermoelectric generator 303 generates electricity to keep the logic solenoid valve 304 open.

[0091] When there is no temperature difference between the second liquid inlet 3021 and the pool body 301, the thermoelectric generator 303 is de-energized, keeping the logic solenoid valve 304 closed.

[0092] The specific connection of its fluid circuit is as follows Figure 2 As shown, those skilled in the art can adapt and add other conventional hydraulic control components to optimize the hydraulic circuit.

[0093] It should be noted that, as Figure 6The logic solenoid valve 304 shown does not control the opening and closing of the third outlet 3022. In actual use, this may cause the heated coolant to enter the three cooling pools 3 simultaneously. However, because the three cooling pools 3 are at different distances from the circulating pump 2, the flow rate of the cooling pool 3 farther from the circulating pump 2 will be significantly lower than that of the cooling pool 3 closer to the circulating pump 2. Therefore, the cooling pool 3 closest to the circulating pump 2 will reach thermal saturation first (there is no temperature difference between the cooling water and the coolant; it should be noted that in this embodiment, all mentions of the temperature difference between the cooling water and the coolant are based on whether the thermoelectric generator 303 is driven to generate electricity, not on the absolute temperature difference). In a more compact cooling unit cabinet 5 layout, in order to achieve the graded use of the cooling pools 3, the logic solenoid valve 304 can be replaced with a three-way solenoid valve to control the opening and closing of the third outlet 3022 and the cooling section 3023 simultaneously.

[0094] By using the above technical solution, the thermoelectric generator 303 is used as the determination unit for whether the cooling pool 3 is used, which avoids the heated coolant from entering the already high-temperature cooling pool 3, thus preventing it from cooling down and improving the reliability of the entire cooling system.

[0095] As a preferred implementation method, such as Figure 2 As shown, the cooling pipe 302 is connected to the liquid pipe 105 and the circulation pump 2 to form a closed circulation liquid circuit. The closed circulation liquid circuit is filled with coolant, which is a mixture of water-based sodium gluconate and aminotrimethylene phosphonic acid.

[0096] It should be noted that most existing technologies use water-based coolants such as pure water, deionized water, and distilled water, and incorporate numerous water purification units. However, after a period of use, metal ions will be released from the metal pipes, especially copper and aluminum pipes, causing the water to become weakly acidic. This, in turn, exacerbates pipe corrosion and scale formation. In this embodiment, a mixture of sodium gluconate (0.5%) and aminotrimethylene phosphonic acid (30ppm) is used to improve the coolant's high-temperature resistance, scale prevention, and corrosion resistance.

[0097] By adopting the above technical solution, using a closed circulating fluid circuit and filling it with a mixture of sodium gluconate and aminotrimethylene phosphonic acid, the risk of coolant corrosion to pipelines and coolant acidification is reduced, the anti-scaling ability of the circulating fluid circuit is improved, and the maintenance requirements of the coolant circulating fluid circuit are reduced.

[0098] As a preferred implementation method, such as Figure 2 and Figure 7 As shown, the cooling pool 3 also includes:

[0099] The liquid replenishment port 305 is located at the top of the pool body 301 and is used to connect to an external water source 7 (exemplarily a municipal water supply pipe).

[0100] The drain outlet 306 is located at the bottom of the pool body 301 and is used to connect to the wastewater pool 8 (exemplarily a municipal sewage pipe). Since the cooling water is only used for heat absorption and will not cause pollution, it can directly meet the discharge conditions.

[0101] When the thermoelectric generator 303 is not generating electricity, the external water source 7 is pumped into the liquid inlet 305, and the cooling water in the cooling pool 3 is discharged from the liquid outlet 306.

[0102] By using the above technical solution, the external water source 7 is used to replace the cooling water in the cooling pool 3. When the cooling water fails to achieve a cooling effect due to temperature rise, it can be quickly replaced, thus improving the self-maintenance performance.

[0103] This embodiment also provides a water-cooling method for a frequency converter with a water-cooling module, which uses the above-mentioned frequency converter with a water-cooling module and further includes the following steps:

[0104] Step S10: Use the coating layer 104 to plastically cover the heating electrical component. After the heating electrical component starts working and heats up, the coating layer 104 is cured. The heat emitted by the heating electrical component is transferred through the coating layer 104 to the composite phase change filler 106 for storage.

[0105] Step S20: Start the circulation pump 2 to make the closed circulation liquid flow, pump the coolant in the cooling pipe 302 into the liquid pipe 105, and remove the heat in the composite phase change packing 106 through the liquid pipe 105.

[0106] Step S30: The heated coolant is circulated back into the cooling pipe 302 and flows into the cooling pool 3, where the coolant in the cooling section 3023 is cooled by the cooling water.

[0107] The above technical solution employs a triple heat exchange system of water cooling, liquid cooling, and phase change materials to separate the cold source and the heat source, which not only improves the safety of the operating environment of electrical components but also reduces the maintenance costs of different heat exchange systems.

[0108] In a preferred embodiment, the method further includes the following step after step S30:

[0109] Step S40: When the temperature of the cooling water is equal to the temperature of the coolant in the second inlet 3021, the thermoelectric generator 303 is de-energized, the logic solenoid valve 304 is closed, and the heated coolant flows into another cooling pool 3 through the third outlet 3022 for circulation.

[0110] Through the above technical solution, the thermoelectric generator 303 is used to switch on and off a single cooling pool 3, so that multiple cooling pools 3 circulate to cool the closed circulating liquid circuit, thereby improving the continuity of cooling.

[0111] In a preferred embodiment, the method further includes the following step after step S40:

[0112] Step S50: When the logic solenoid valve 304 is closed, the external water source 7 is introduced into the liquid inlet 305, and the heated cooling water is discharged from the liquid outlet 306.

[0113] By adopting the above technical solution and actively changing the water after the cooling pool 3 is closed, the efficiency of restarting the cooling pool 3 after overheating is improved.

[0114] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope described in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A frequency converter with a water-cooled module, comprising a frequency converter unit cabinet (4) and a cooling unit cabinet (5), characterized in that, Also includes: The heat exchange channel (6) is located above the inverter unit cabinet (4) and the cooling unit cabinet (5); Several cooling pools (3) are spaced apart inside the cooling unit cabinet (5); Several heat exchange rods (1) are inserted between the heat exchange channel (6) and the inverter unit cabinet (4). The heat exchange rods (1) are filled with composite phase change filler (106). One end of the heat exchange rod (1) is thermally connected to the heat-generating electrical components in the inverter unit cabinet (4). One end of the heat exchange rod (1) inserted into the heat exchange channel (6) is provided with a spiral liquid pipe (105). The liquid pipe (105) is connected to the cooling pool (3). A circulation pump (2) is connected between the heat exchange rod (1) and the cooling pool (3).

2. The frequency converter with a water-cooling module according to claim 1, characterized in that, The heat exchange rod (1) has: A heat exchange section (103) is provided at one end where the heat exchange rod (1) passes through the inverter unit cabinet (4); A covering layer (104) is connected between the heat exchange section (103) and the heating electrical element, and the covering layer (104) is in contact with the heating electrical element; A cooling section (102) is provided at one end of the heat exchange rod (1) that penetrates the heat exchange channel (6).

3. The frequency converter with a water-cooling module according to claim 2, characterized in that, The composite phase change filler (106) is a paraffin-graphene composite filler.

4. The frequency converter with a water-cooling module according to claim 3, characterized in that, The coating layer (104) is a thermosetting thermally conductive and insulating composite material.

5. The frequency converter with a water-cooling module according to claim 4, characterized in that, The cooling pool (3) also includes: The pool body (301) is filled with cooling water; The cooling pipe (302) has a second liquid inlet (3021), a third liquid outlet (3022), a cooling section (3023), and a second liquid outlet (3024). The cooling section (3023) is installed inside the pool body (301) and is submerged in the cooling water. The third liquid outlet (3022) is connected to the liquid pipe (105) or to the second liquid inlet (3021) of another cooling pool (3). The second liquid outlet (3024) is connected to the liquid pipe (105). A thermoelectric generator (303) is connected between the second liquid inlet (3021) and the pool body (301). The thermoelectric generator (303) generates electricity based on the temperature difference between the second liquid inlet (3021) and the pool body (301). A logic solenoid valve (304) is connected between the second liquid inlet (3021) and the cooling section (3023); When there is a temperature difference between the second liquid inlet (3021) and the pool body (301), the thermoelectric generator (303) generates electricity to keep the logic solenoid valve (304) open; When there is no temperature difference between the second liquid inlet (3021) and the pool body (301), the thermoelectric generator (303) is de-energized, keeping the logic solenoid valve (304) closed.

6. The frequency converter with a water-cooling module according to claim 5, characterized in that, The cooling pipe (302) is connected to the liquid pipe (105) and the circulation pump (2) to form a closed circulation liquid path. The closed circulation liquid path is filled with coolant, which is a mixture of water-based sodium gluconate and aminotrimethylene phosphonic acid.

7. The frequency converter with a water-cooling module according to claim 6, characterized in that, The cooling pool (3) also includes: A liquid replenishment port (305) is located at the top of the pool body (301) and is used to connect to an external water source (7). A drain outlet (306) is located at the bottom of the pool body (301) and is used to connect to the wastewater pool (8). When the thermoelectric generator (303) does not generate electricity, the liquid inlet (305) pumps in external water, and the liquid outlet (306) discharges the cooling water in the cooling pool (3).

8. A water-cooling method for a frequency converter with a water-cooling module, characterized in that, Using the frequency converter with a water-cooled module as described in claim 7, the method further includes the following steps: Step S10: Use the coating layer (104) to plastically cover the heating electrical component. After the heating electrical component heats up during operation, the coating layer (104) is cured. The heat emitted by the heating electrical component is transferred through the coating layer (104) to the composite phase change filler (106) for storage. Step S20: Start the circulation pump (2) to make the closed circulation liquid flow, pump the coolant in the cooling pipe (302) into the liquid pipe (105), and remove the heat in the composite phase change packing (106) through the liquid pipe (105); Step S30: The heated coolant is circulated back into the cooling pipe (302) and flows into the cooling pool (3), and the coolant in the cooling section (3023) is cooled by the cooling water.

9. The water-cooling method for a frequency converter with a water-cooling module according to claim 8, characterized in that, The process following step S30 also includes: Step S40: When the temperature of the cooling water is equal to the temperature of the coolant in the second inlet (3021), the thermoelectric generator (303) is de-energized, the logic solenoid valve (304) is closed, and the heated coolant flows into another cooling pool (3) through the third outlet (3022) for circulation.

10. The water-cooling method for a frequency converter with a water-cooling module according to claim 9, characterized in that, The process following step S40 also includes: Step S50: When the logic solenoid valve (304) is closed, the external water source (7) is introduced into the liquid inlet (305), and the cooling water after heating is discharged from the liquid outlet (306).

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