Frequency converter with water cooling module and water cooling method

Abstract

The invention relates to a frequency converter with a water cooling module and a water cooling method, and belongs to the technical field of high-voltage frequency converters. A heat exchange channel is arranged above a frequency converter unit cabinet and a cooling unit cabinet; the plurality of cooling pools are arranged in the cooling unit cabinet at intervals; a plurality of heat exchange rods are connected between the heat exchange channel and the frequency converter unit cabinet in a penetrating manner, the heat exchange rods are filled with composite phase change filler, one end of each heat exchange rod is in heat conduction connection with a heating electrical element in the frequency converter unit cabinet, the end, penetrating into the heat exchange channel, of each heat exchange rod is in liquid cooling circulation connection with the cooling pond, and a circulating pump is connected between each heat exchange rod and the cooling pond; the technical problem that a relatively safe and low-energy-consumption high-voltage frequency converter cooling mode is lacked in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-voltage frequency converters, and particularly relates to a frequency converter with a water cooling module and a water cooling method. BACKGROUND

[0002] Heat dissipation of a high-voltage frequency converter is a key link to ensure safe, efficient and long-life operation of the high-voltage frequency converter. The root cause of heat generation is energy loss of power devices and circuit elements, and an effective heat dissipation system can not only avoid failure of the elements due to high temperature, but also improve reliability and stability of the equipment. Traditional cooling technologies often use air cooling and liquid cooling, but the air cooling has poor heat dissipation capacity and is difficult to meet the heat dissipation requirement of the high-voltage frequency converter, and when the liquid cooling is used, pipeline arrangement, condensate water and influence on electrical elements also increase the difficulty in use.

[0003] The patent with the publication number CN214046488U discloses an air-water cooling device special for high-efficiency and low-noise high-voltage frequency converters, which comprises an electrical chamber in which a high-voltage frequency converter is installed, underground air shunting chambers, underground cooling chambers and underground water pools are arranged below the electrical chamber, a first cold air pipeline is arranged at an air outlet of the underground cooling chamber, a second cold air pipeline is arranged on the underground water pool, a first fan is arranged in the first cold air pipeline, and a second fan is arranged in the second cold air pipeline. The utility model adopts a closed cycle cooling mode, sets the high-voltage frequency converter in the sealed electrical chamber, and sets the fan in the underground cold air pipeline, thereby effectively solving the influence of the outdoor environment on the high-voltage frequency converter, improving the sound insulation effect and reducing the noise volume; meanwhile, a temperature sensor is arranged to control the rotating speed of the fan, to accelerate the circulation of hot air, and the underground cooling chamber and the underground water pool are used to cool the hot air.

[0004] The existing technology has the following defects:

[0005] The air-water cooling mode is used to cool the electrical chamber of the high-voltage frequency converter by introducing cold air, but the cold air entering the electrical chamber will form condensate water at non-heating parts such as the cabinet body and the ceiling, and the dripping and accumulation of the condensate water will have adverse effects on the operation of the high-voltage frequency converter. Even if a drying agent is added to the air circulation, condensate water will still be generated if the drying agent is not replaced in time. In addition, the specific heat capacity of air is relatively low, and a large-power fan is needed to transport a large amount of air, so the existing technology lacks a relatively safe and low-energy-consumption cooling mode for the high-voltage frequency converter. SUMMARY

[0006] The application provides a frequency converter with a water cooling module and a water cooling method, which can solve the technical problem of lack of a relatively safe and low-energy-consumption cooling mode for the high-voltage frequency converter in the prior art.

[0007] In order to achieve the above-mentioned purposes, the application is implemented by the following technical solutions:

[0008] The application provides a frequency converter with a water cooling module, comprising a frequency converter unit cabinet and a cooling unit cabinet, which further comprises:

[0009] A heat exchange channel is arranged above the frequency converter unit cabinet and the cooling unit cabinet;

[0010] A plurality of cooling pools are arranged in the interior of the cooling unit cabinet at intervals;

[0011] A plurality of heat exchange rods are connected between the heat exchange channel and the frequency converter unit cabinet, the heat exchange rods are filled with composite phase change fillers, one end of the heat exchange rod is in thermal contact with the heating electrical element in the frequency converter unit cabinet, the end of the heat exchange rod penetrating into the heat exchange channel is in liquid cooling circulation connection with the cooling pool, and a circulating pump is connected between the heat exchange rod and the cooling pool.

[0012] By the above technical scheme, the heat exchange rod is used, the composite phase change filler is used as the relay conduction of heat, the low-temperature cooling liquid is prevented from entering the frequency converter unit cabinet, the operation safety of the frequency converter is improved, and in addition to the conventional cooling liquid circulation power, no additional high-power equipment is needed, and the energy consumption is reduced.

[0013] In the application, the heat exchange rod has:

[0014] A heat exchange part is arranged at one end of the heat exchange rod penetrating into the frequency converter unit cabinet;

[0015] A cladding layer is connected between the heat exchange part and the heating electrical element, and the cladding layer is in contact with the heating electrical element;

[0016] A cooling part is arranged at one end of the heat exchange rod penetrating into the heat exchange channel;

[0017] A liquid pipe is spirally arranged in the cooling part, and the liquid pipe is in communication with the cooling pool.

[0018] By the above technical scheme, the cladding layer is used to improve the contact area between the heat exchange rod and the heating electrical element, and the heat conduction efficiency is improved.

[0019] In the application, the composite phase change filler is a paraffin-graphene composite filler.

[0020] By the above technical scheme, the paraffin-graphene composite filler is used as the phase change filler, has higher latent heat and heat storage density, and has strong heat conduction performance.

[0021] In the application, the cladding layer is a thermosetting heat-conducting insulating composite material.

[0022] By the technical scheme, the wrapping layer of the thermosetting heat-conducting insulating composite material is adopted, so that plastic coating installation at normal temperature is facilitated, and stable connection performance is provided after high-temperature solidification after operation and heat generation.

[0023] In the application, the cooling pool further comprises:

[0024] a pool body into which cooling water is injected;

[0025] a cooling pipe having a second liquid inlet, a third liquid outlet, a cooling section and a second liquid outlet, the cooling section being arranged in the pool body and being immersed in the cooling water, the third liquid outlet being connected to the liquid pipe or the second liquid inlet of another cooling pool, and the second liquid outlet being connected to the liquid pipe;

[0026] a thermoelectric power generation sheet connected between the second liquid inlet and the pool body, the thermoelectric power generation sheet generating power based on a temperature difference between the second liquid inlet and the pool body;

[0027] a logic electromagnetic valve 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 power generation sheet generates power to keep the logic electromagnetic valve open;

[0029] when there is no temperature difference between the second liquid inlet and the pool body, the thermoelectric power generation sheet is powered off to keep the logic electromagnetic valve closed.

[0030] By the technical scheme, the thermoelectric power generation sheet is used as a judgment unit for whether the cooling pool is used, so that the heated cooling liquid is prevented from entering the cooling pool which is already at high temperature, so that the cooling liquid cannot be cooled, and the reliability of the entire cooling system is improved.

[0031] In the application, the cooling pipe is connected to the liquid pipe and the circulating pump to form a closed circulating liquid path, the closed circulating liquid path is filled with cooling liquid, and the cooling liquid is a mixed liquid of water-based sodium gluconate and amino-trimethylene phosphonic acid.

[0032] By the technical scheme, the closed circulating liquid path is used, and after being filled with the mixed liquid of water-based sodium gluconate and amino-trimethylene phosphonic acid, the corrosion of the cooling liquid to the pipeline and the risk of acidification of the cooling liquid are reduced, the anti-fouling ability of the circulating liquid path is improved, and the maintenance requirement of the cooling liquid circulating liquid path is reduced.

[0033] In the application, the cooling pool further comprises:

[0034] a liquid supplementing port arranged at the top of the pool body and used for connecting an external water source;

[0035] a liquid discharging port arranged at the bottom of the pool body and used for connecting a waste water pool.

[0036] When the thermoelectric chip does not generate electricity, the liquid supplement port pumps external water source, and the liquid discharge port discharges cooling water in the cooling pool.

[0037] By the above technical solution, the cooling water in the cooling pool is replaced by the external water source, and when the cooling water cannot be cooled due to temperature rise, the cooling water is quickly replaced, thereby improving the self-maintenance performance.

[0038] The application also provides a water cooling method of a frequency converter with a water cooling module, which uses the frequency converter with the water cooling module, and further includes the following steps:

[0039] Step S10: The heat-emitting electrical element is covered with the coating layer, and the coating layer is solidified after the heat-emitting electrical element is heated; the heat emitted by the heat-emitting electrical element is transferred to the composite phase change filler through the coating layer for storage;

[0040] Step S20: The circulating pump is started to make the closed circulating liquid circuit flow, and the cooling liquid in the cooling pipe is pumped into the liquid pipe to take away the heat in the composite phase change filler through the liquid pipe;

[0041] Step S30: The heated cooling liquid is circulated back to the cooling pipe and flows into the cooling pool, and the cooling water is used to cool the cooling liquid in the cooling section.

[0042] By the above technical solution, the water cooling-liquid cooling-phase change material triple heat exchange system is used to separate the heat source and the cold source, which improves the safety of the electrical element operating environment and reduces the maintenance cost of different heat exchange systems.

[0043] In the application, the above step S30 further includes:

[0044] Step S40: When the temperature of the cooling water is equal to the temperature of the cooling liquid in the second liquid inlet, the thermoelectric chip is powered off, the logical electromagnetic valve is closed, and the heated cooling liquid flows into another cooling pool through the third liquid outlet for circulation.

[0045] By the above technical solution, the thermoelectric chip is used to switch the single cooling pool, and the multiple cooling pools are used to cool the closed circulating liquid circuit, thereby improving the continuity of cooling.

[0046] In the application, the above step S40 further includes:

[0047] Step S50: When the logical electromagnetic valve is closed, the liquid supplement port is connected to the external water source, and the liquid discharge port discharges the heated cooling water.

[0048] Through the above technical solution, active water replacement is adopted after the cooling pool is closed, which improves the efficiency of restarting the cooling pool after overheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0050] Figure 1 A schematic plan view of an inverter with a water cooling module provided by an embodiment of the present invention;

[0051] Figure 2 A liquid circuit diagram of a water cooling module of a frequency converter having a water cooling module provided by an embodiment of the present invention;

[0052] Figure 3 An axonometric view of a heat exchange rod 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 The sectional view at AA in FIG;

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

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

[0057] Figure 8 for Figure 7 Cross-sectional view at BB in.

[0058] Icons: 1-heat exchange rod; 101-extension tube; 102-cooling part; 103-heat exchange part; 104-coating layer; 105-liquid pipe; 1051-first liquid inlet; 1052-first liquid outlet; 106-composite phase change filler; 107-buffer zone; 2-circulation 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 power generation plate; 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 DESCRIPTION

[0059] The embodiments of the present application will be described in detail below with reference to the drawings.

[0060] In the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0061] The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0062] In the description of the present application, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be welding, or bolted connection, or riveting; it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0063] Embodiment:

[0064] Please refer to Figures 1 to 8 , Figures 1 to 8 The figure shows an embodiment of the present application.

[0065] The embodiment provides a frequency converter with a water cooling module, which comprises a frequency converter unit cabinet 4 and a cooling unit cabinet 5, and further comprises:

[0066] The heat exchange channel 6 is arranged above the frequency converter unit cabinet 4 and the cooling unit cabinet 5;

[0067] The three cooling pools 3 are arranged at intervals in the interior of the cooling unit cabinet 5;

[0068] The six heat exchange rods 1 are connected between the heat exchange channel 6 and the frequency converter unit cabinet 4, the heat exchange rod 1 is filled with composite phase change filler 106, one end of the heat exchange rod 1 is in thermal connection with the heating electrical element in the frequency converter unit cabinet 4, the end of the heat exchange rod 1 penetrating into the heat exchange channel 6 is in liquid cooling circulation connection with the cooling pool 3, and the circulation pump 2 is connected between the heat exchange rod 1 and the cooling pool 3.

[0069] As shown in Figure 1 and Figure 3 , the heat exchange rod 1 has an elongated cylinder 101, by replacing the elongated cylinder 101 of different lengths to adapt to the insertion depth of the heat exchange rod 1 in the frequency converter unit cabinet 4, to ensure that it can be correctly connected to the heating electrical element, while the elongated cylinder 101 can be a straight cylinder, or can be set as a curved customized cylinder type according to the arrangement of the heating electrical element.

[0070] It should be noted that the cooling unit cabinet 5 and the frequency converter unit cabinet 4 can be separately arranged or temperature insulated, Figure 1 only as a layout diagram, not necessarily close to the setting; the technical solution of the embodiment is significantly different from the conventional cooling method, which discards the conventional cognition of directly introducing the cold source into the heating electrical element for cooling, but innovatively uses the phase change material to conduct the heat of the heating electrical element out, and contacts the cold source in the heat exchange channel 6, which is an independent space, to avoid the generation of condensate water in the frequency converter unit cabinet 4.

[0071] Through the above technical solution, the heat exchange rod 1 is used, and the composite phase change filler 106 is used as the relay conduction of heat, which avoids the low-temperature cooling liquid from entering the frequency converter unit cabinet 4, improves the operation safety of the frequency converter, and in addition to the conventional cooling liquid circulation power, no additional high-power equipment is needed, reducing energy consumption.

[0072] As a more preferred embodiment, as shown in Figures 3 to 5 , the heat exchange rod 1 has:

[0073] The heat exchange part 103 is arranged at one end of the heat exchange rod 1 penetrating into the frequency converter unit cabinet 4;

[0074] The cladding layer 104 is connected between the heat exchange part 103 and the heating electrical element, and the cladding layer 104 is in contact with the heating electrical element;

[0075] The cooling part 102 is arranged at one end of the heat exchange rod 1 penetrating into the heat exchange channel 6;

[0076] The liquid pipe 105 is spirally arranged in the cooling part 102, and the liquid pipe 105 is in communication with the cooling pool 3, and specifically as shown in Figure 2 , Figure 4 and Figure 8 , the first liquid outlet 1052 is connected with the second liquid inlet 3021 of the uppermost cooling pool 3, and the first liquid inlet 1051 is connected with the second liquid outlet 3024.

[0077] The cooling part 102 is made by embedding and pouring the liquid pipe 105, the heat exchange part 103 and the cooling part 102 are threadedly connected with the extension cylinder 101, and the thread is coated with heat-conducting silicone grease during the thread connection, and the composite phase change filler 106 in a solid state is pre-filled in the extension cylinder 101, the cooling part 102 and the heat exchange part 103 during the combination. It should be noted that, as shown in Figure 5 When the composite phase change filler 106 melts, a buffer zone 107 is formed in the heat exchange rod 1 to adapt to the thermal expansion of the composite phase change filler 106.

[0078] Through the above technical scheme, the cladding layer 104 is used to increase the contact area between the heat exchange rod 1 and the heating electrical element, and the heat conduction efficiency is improved.

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

[0080] For example, 5% by weight of graphene nanosheets is added to paraffin and mixed, the inert carbon structure of graphene can inhibit the oxidative decomposition of paraffin at high temperatures (pure paraffin will produce carbon chain rupture when used at a temperature above 120°C for a long time), and at the same time, paraffin is a non-polar organic substance and graphene is an inert carbon material, neither of which will have an electrochemical reaction with copper pipes, and no additional corrosion-resistant coating is needed. Compared with the traditional heat pipe using water or ammonia as the phase change material, the paraffin-graphene composite filler (5% by weight of graphene) has a higher thermal conductivity (about 1.5 W / m·K-3.0 W / m·K) and a higher latent heat (about 180 kj / kg-220 kj / kg). It should be noted that when graphene nanosheets are added to paraffin, the dispersibility of graphene should be considered, and ultrasonic-assisted blending can be used if necessary to avoid agglomeration and cause uneven thermal conductivity. The filler should be tested for thermal conductivity before filling.

[0081] Through the above technical scheme, the paraffin-graphene composite filler is used as the phase change filler, which has higher latent heat and heat storage density, and has strong thermal conductivity.

[0082] As a more preferred embodiment, the cladding layer 104 is a thermosetting heat-conducting and insulating composite material.

[0083] For example, epoxy-imidazole + 20% boron nitride + 30% aluminum oxide , The solidification starting temperature is 40-50°C, and it is plastic at room temperature. When the temperature is raised to above 40°C, the imidazole ring is opened to initiate crosslinking of the epoxy group, forming a three-dimensional network, and the flaky hexagonal boron nitride forms a heat-conducting path in the resin. By adjusting the ratio of boron nitride and aluminum oxide, the room temperature plasticity can be maintained and the surface thermal conductivity can be improved.

[0084] By the technical scheme, the wrapping layer of the thermosetting heat-conducting insulating composite material is adopted, so that plastic coating installation at normal temperature is facilitated, and stable connection performance is provided after high-temperature solidification after operation and heat generation.

[0085] As a preferred embodiment, as shown in Figures 6 to 8 The cooling pool 3 further includes:

[0086] The pool body 301 is filled with cooling water;

[0087] 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 arranged in the pool body 301 and is immersed in the cooling water. The third liquid outlet 3022 is connected to the liquid pipe 105 or the second liquid inlet 3021 of another cooling pool 3, and the second liquid outlet 3024 is connected to the liquid pipe 105.

[0088] The thermoelectric generator 303 is connected between the second liquid inlet 3021 and the pool body 301, and 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, keeping 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 powered off, keeping the logic solenoid valve 304 closed.

[0092] The specific liquid connection is shown in Figure 2 The skilled person can adaptively add other conventional liquid control elements to optimize the liquid circuit.

[0093] It should be noted that, as Figure 6The logic solenoid valve 304 does not control the on-off of the third liquid outlet 3022, which may cause the heated cooling liquid to enter the three cooling pools 3 simultaneously in actual use, but because the three cooling pools 3 are different distances from the circulating pump 2, the flow rate of the cooling pool 3 far from the circulating pump 2 will be significantly lower than that of the cooling pool 3 close to the circulating pump 2, so the cooling pool 3 closest to the circulating pump 2 will reach thermal saturation (no temperature difference between cooling water and cooling liquid) first. (Note that in this embodiment, all temperature differences mentioned between cooling water and cooling liquid are judged by whether the temperature difference power generation sheet 303 is driven to generate electricity, not the absolute same temperature.) In a more compact cooling unit cabinet 5 layout, in order to realize the hierarchical use of the cooling pool 3, the logic solenoid valve 304 can be replaced by a three-way solenoid valve to control the on-off of the third liquid outlet 3022 and the cooling section 3023.

[0094] By the above technical solution, the temperature difference power generation sheet 303 is used as a judgment unit for whether the cooling pool 3 is used, avoiding the heated cooling liquid from entering the cooling pool 3 that is already high temperature, resulting in the inability to cool down, and improving the reliability of the entire cooling system.

[0095] As a more preferred embodiment, as shown in Figure 2 The above cooling pipe 302 is in communication with the liquid pipe 105 and the circulating pump 2 to form a closed circulation liquid path, and the closed circulation liquid path is filled with cooling liquid, and the cooling liquid is a mixed liquid of water-based sodium gluconate and amino-trimethylene phosphonic acid.

[0096] It should be noted that in the prior art, most of the water-based cooling liquid is selected from pure water, deionized water, distilled water, etc., and a large number of water purification units are provided. However, after using such water for a period of time, metal ions will be released from metal pipes, especially copper pipes and aluminum pipes, causing the water to become weakly acidic, thereby accelerating the corrosion of the pipes and the formation of scale. In this embodiment, a mixed liquid of sodium gluconate (0.5%) and amino-trimethylene phosphonic acid (30ppm) is used to improve the high-temperature resistance, scale resistance, and corrosion resistance of the cooling liquid.

[0097] By the above technical solution, the closed circulation liquid path is filled with a mixed liquid of sodium gluconate and amino-trimethylene phosphonic acid, reducing the risk of corrosion of the cooling liquid on the pipes and acidification of the cooling liquid, improving the scale resistance of the circulation liquid path, and reducing the maintenance requirements of the cooling liquid circulation liquid path.

[0098] As a more preferred embodiment, as shown in Figure 2 and Figure 7 The above cooling pool 3 further comprises:

[0099] The liquid supplementing port 305 is arranged at the top of the pool body 301 and is used to connect an external water source 7 (exemplarily, a municipal water supply pipeline);

[0100] The drain 306 is arranged at the bottom of the pool body 301 and is used to connect the waste water pool 8 (for example, a municipal sewage pipe). Since the cooling water is only used as heat absorption and does not cause pollution, the cooling water can directly meet the discharge conditions;

[0101] When the thermoelectric generator 303 does not generate electricity, the liquid supplement port 305 pumps in the external water source 7, and the drain 306 discharges the cooling water in the cooling pool 3.

[0102] Through 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 cannot be cooled due to temperature rise, the cooling water can be quickly replaced, and the self-maintenance performance is improved.

[0103] The embodiment also provides a water cooling method of a frequency converter with a water cooling module. The frequency converter with the water cooling module is used, and the method further includes the following steps:

[0104] Step S10: The heat-emitting electrical element is covered with the coating layer 104. After the heat-emitting electrical element is heated and rises in temperature, the coating layer 104 is solidified. The heat emitted by the heat-emitting electrical element is transmitted to the composite phase change filler 106 through the coating layer 104 and is stored in the composite phase change filler 106.

[0105] Step S20: The circulating pump 2 is started to flow the closed circulating liquid path. The cooling liquid in the cooling pipe 302 is pumped into the liquid pipe 105, and the heat in the composite phase change filler 106 is taken away through the liquid pipe 105.

[0106] Step S30: The heated cooling liquid is circulated back to the cooling pipe 302 and flows into the cooling pool 3. The cooling water is used to cool the cooling liquid in the cooling section 3023.

[0107] Through the above technical solution, the water cooling-liquid cooling-phase change material triple heat exchange system is used to separate the heat source and the cooling source. The safety of the operating environment of the electrical element is improved, and the maintenance cost of different heat exchange systems is reduced.

[0108] As a more preferred embodiment, the above step S30 further includes:

[0109] Step S40: When the temperature of the cooling water is equal to the temperature of the cooling liquid in the second liquid inlet 3021, the thermoelectric generator 303 is powered off, and the logic electromagnetic valve 304 is closed. The heated cooling liquid flows into another cooling pool 3 through the third liquid outlet 3022 and is circulated.

[0110] Through the above technical solution, the thermoelectric generator 303 is used to switch the single cooling pool 3. The multiple cooling pools 3 are used to cool the closed circulating liquid path, and the continuity of cooling is improved.

[0111] As a more preferred embodiment, the above step S40 further includes:

[0112] Step S50: When the logic solenoid valve 304 is closed, the liquid supplement port 305 is connected to the external water source 7, and the liquid discharge port 306 discharges the heated cooling water.

[0113] Through the above technical scheme, the active water replacement after the cooling pool 3 is closed is adopted, and the efficiency of the overheating restart of the cooling pool 3 is improved.

[0114] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A frequency converter with a water cooling module, comprising a frequency converter unit cabinet (4) and a cooling unit cabinet (5), characterized in that: Also includes: A heat exchange channel (6) is provided above the frequency converter unit cabinet (4) and the cooling unit cabinet (5); A plurality of cooling pools (3) are arranged at intervals inside the cooling unit cabinet (5); A plurality of 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 fillers (106); one end of the heat exchange rod (1) is thermally connected to a heating electrical component in the inverter unit cabinet (4); one end of the heat exchange rod (1) that passes through the heat exchange channel (6) is connected to the liquid cooling circulation of the cooling pool (3); and 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 portion (103) is provided at one end of the heat exchange rod (1) that penetrates into the inverter unit cabinet (4); a coating layer (104) connected between the heat exchange portion (103) and the heating electrical element, the coating layer (104) being in contact with the heating electrical element; A cooling portion (102) is provided at one end of the heat exchange rod (1) that penetrates into the heat exchange channel (6); The liquid pipe (105) is spirally arranged in the cooling portion (102), and the liquid pipe (105) is connected to the cooling pool (3).

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 heat-conducting 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 tank body (301) is filled with cooling water; A cooling pipe (302) having 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 disposed in the pool body (301); the cooling section (3023) is immersed 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); and the second liquid outlet (3024) is connected to the liquid pipe (105); A thermoelectric power generation sheet (303) is connected between the second liquid inlet (3021) and the cell body (301), and the thermoelectric power generation sheet (303) generates electricity based on the temperature difference between the second liquid inlet (3021) and the cell body (301); a logic solenoid valve (304), 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 cell body (301), the thermoelectric power generation sheet (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 cell body (301), the thermoelectric power generation chip (303) is powered off, 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 circulating pump (2) to form a closed circulating liquid circuit. The closed circulating liquid circuit is filled with a cooling liquid, which is a mixture of water-based sodium gluconate and aminotrimethylenephosphonic 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 inlet (305) is provided at the top of the tank body (301) and is used for connecting to an external water source (7); A drain port (306) is provided at the bottom of the tank body (301) and is used for connecting to the wastewater tank (8); When the thermoelectric power generation sheet (303) does not generate electricity, the liquid replenishing port (305) pumps in an external water source, and the liquid draining port (306) drains the cooling water in the cooling pool (3).

8. A water cooling method for a frequency converter having a water cooling module, characterized in that: The use of the frequency converter with the water cooling module according to claim 7 further comprises the following steps: Step S10: using the coating layer (104) to plastically cover the heating electrical element, and after the heating electrical element is heated during operation, the coating layer (104) is solidified, and the heat emitted by the heating electrical element is transferred through the coating layer (104) to the composite phase change filler (106) for storage; Step S20: starting the circulation pump (2) to allow the closed circulation liquid circuit to flow, pumping the coolant in the cooling pipe (302) into the liquid pipe (105), and taking away the heat in the composite phase change filler (106) through the liquid pipe (105); Step S30: The heated coolant circulates 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 of the frequency converter with the water cooling module according to claim 8, characterized in that: After step S30, the following steps are further included: Step S40: When the temperature of the cooling water is equal to the temperature of the coolant in the second liquid inlet (3021), the thermoelectric power generation chip (303) is powered off, the logic solenoid valve (304) is closed, and the heated coolant flows into another cooling pool (3) through the third liquid outlet (3022) for circulation.

10. The water cooling method of the frequency converter with a water cooling module according to claim 9, characterized in that: After step S40, the following steps are further included: Step S50: When the logic solenoid valve (304) is closed, the external water source (7) is introduced into the liquid replenishing port (305), and the heated cooling water is discharged from the liquid drain port (306).

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