A current transformer

Abstract

The application discloses a kind of current transformer, comprising: cabinet, and be set to water cooling heat dissipation system in cabinet;Cabinet is equipped with multiple to be cooled cavities, each to be cooled cavity is used to arrange corresponding to be cooled component;Water cooling heat dissipation system includes: multiple heat dissipation water routes, each heat dissipation water route is set in corresponding to be cooled cavity.In the present scheme, different to be cooled component is placed in corresponding to be cooled cavity, and is cooled using water cooling heat dissipation mode, not only can simplify the layout of to be cooled component, so that current transformer obtains better maintainability, but also can greatly improve the heat dissipation performance of current transformer, effectively enhance the current output capacity of current transformer, while, also help current transformer to reduce volume and weight design.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of converter technology, in particular to a kind of converter. BACKGROUND

[0002] Mining vehicle converter converts generator electric quantity into adjustable AC voltage according to vehicle load and control demand to power traction motor, and it is the key electrical equipment of electric drive system.Dust, wind and rain, snow, high and low temperature and vehicle vibration and other harsh working condition environment to the sealing performance, shock resistance, heat dissipation performance, safety, maintainability, lightweight of converter cabinet are strictly required.

[0003] Because of the low cost of air cooling heat dissipation, small tonnage mining vehicle converter in the prior art mostly uses air cooling heat dissipation, but air cooling heat dissipation is noisy, low in efficiency, and the air duct design is complex, and the low energy efficiency of air cooling heat dissipation limits the current output capability of the converter, and the increase of the air duct makes the cabinet volume increase, which is difficult to meet the limited vehicle installation space.In addition, the air cooling heat dissipation module is heavy due to the existence of the heat dissipation fin, the cabinet occupies a large area, the maintenance space is small, and the maintenance is very difficult. SUMMARY

[0004] Therefore, the present application provides a kind of converter, not only can simplify the layout of the component to be cooled, to facilitate the converter to obtain better maintainability, but also can greatly improve the heat dissipation performance of the converter, effectively enhance the current output capability of the converter, at the same time, also help the converter to reduce the volume and weight design.

[0005] To achieve the above object, the present application provides the following technical scheme:

[0006] A kind of converter, comprising: cabinet, and water cooling heat dissipation system arranged in the cabinet;The cabinet is provided with a plurality of heat dissipation cavities, each of the heat dissipation cavities is used to arrange corresponding heat dissipation components;The water cooling heat dissipation system includes: a plurality of heat dissipation waterways, each of the heat dissipation waterways is arranged in the corresponding heat dissipation cavity.

[0007] Preferably, the heat dissipation cavity includes: power module cavity, transformer cavity, reactor cavity and / or main variable rectifier power module cavity;

[0008] The heat dissipation waterway includes: power module heat dissipation waterway, transformer heat dissipation waterway, reactor heat dissipation waterway and / or main variable rectifier power module heat dissipation waterway;The power module heat dissipation waterway is arranged in the transformer cavity;The transformer heat dissipation waterway is arranged in the transformer cavity;The reactor heat dissipation waterway is arranged in the reactor cavity;The main variable rectifier power module heat dissipation waterway is arranged in the main variable rectifier power module cavity.

[0009] Preferably, further comprising: a water cooling cavity arranged in the cabinet; the water cooling heat dissipation system further comprises: a water pump and a water tank arranged in the water cooling cavity.

[0010] Preferably, the water cooling cavity is provided with a drain port communicated with the outside of the cabinet.

[0011] Preferably, further comprising: an auxiliary cooling heat dissipation system; the auxiliary cooling heat dissipation system comprises: a water-air heat exchanger; the water cooling heat dissipation system further comprises: an auxiliary heat exchange water path; the auxiliary heat exchange water path is connected to the water-air heat exchanger.

[0012] The water-air heat exchanger comprises: a power module heat exchange branch, a transformer heat exchange branch and / or a common DC low inductance busbar heat exchange branch.

[0013] Preferably, further comprising: a water-air heat exchanger cavity arranged in the cabinet for arranging the water-air heat exchanger; the water-air heat exchanger cavity is opposite to the water cooling cavity.

[0014] Preferably, the cavity to be cooled comprises: a power module cavity, a transformer cavity and / or a main rectifier power module cavity.

[0015] The converter further comprises: a plurality of non-radiation cavities arranged in the cabinet, each of the non-radiation cavities is used for arranging a corresponding non-radiation component; the non-radiation cavities comprise: a control unit cavity, a wiring cavity and / or a support capacitor cavity.

[0016] The transformer cavity is located at the bottom of the cabinet, the wiring cavity is opposite to the transformer cavity in the front-rear direction, the power module cavity is opposite to the support capacitor cavity in the front-rear direction, and the main rectifier power module cavity is opposite to the control unit cavity in the front-rear direction.

[0017] Preferably, the cavity to be cooled comprises: a power module cavity; the non-radiation cavity comprises: a support capacitor cavity.

[0018] The power module cavity comprises: a main transformer power module cavity and an auxiliary transformer power module cavity; the main transformer power module cavity is arranged below the front of the cabinet; the auxiliary transformer power module cavity is arranged above the front of the cabinet.

[0019] The support capacitor cavity comprises: a main transformer support capacitor cavity and an auxiliary transformer support capacitor cavity; the main transformer support capacitor cavity is arranged below the rear of the cabinet and opposite to the main transformer power module cavity; the auxiliary transformer support capacitor cavity is arranged above the rear of the cabinet and opposite to the auxiliary transformer power module cavity.

[0020] Preferably, further comprising: a main transformer common DC low inductance busbar, an auxiliary transformer common DC low inductance busbar, a main transformer quick plug and an auxiliary transformer quick plug.

[0021] The main transformer common DC low inductance busbar and the auxiliary transformer common DC low inductance busbar are arranged in the middle part of the cabinet body; the main transformer common DC low inductance busbar is used for fixedly connecting a main transformer support capacitor; the main transformer fast plug is used for connecting a main transformer power module and the main transformer common DC low inductance busbar; the auxiliary transformer common DC low inductance busbar is used for fixedly connecting an auxiliary transformer support capacitor; and the auxiliary transformer fast plug is used for connecting an auxiliary transformer power module and the auxiliary transformer common DC low inductance busbar.

[0022] From the above technical solution, it can be seen that in the converter provided by the application, different components to be cooled are arranged in corresponding cavities to be cooled, and water cooling is used for cooling, which not only simplifies the layout of the components to be cooled, so as to facilitate better maintainability of the converter, but also greatly improves the heat dissipation performance of the converter, effectively enhances the current output capacity of the converter, and at the same time, helps to reduce the volume and weight of the converter. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0024] Figure 1 The front view of the converter provided by the embodiment of the application (closed door state) is shown in the following figure:

[0025] Figure 2 The back view of the converter provided by the embodiment of the application (closed door state) is shown in the following figure:

[0026] Figure 3 The front layout view of the converter provided by the embodiment of the application (remove the door state) is shown in the following figure:

[0027] Figure 4 The back layout view of the converter provided by the embodiment of the application (remove the door state) is shown in the following figure:

[0028] Figure 5 The connection diagram of the power module, the low inductance busbar and the support capacitor provided by the embodiment of the application is shown in the following figure:

[0029] Figure 6 The chassis structure diagram of the converter provided by the embodiment of the application is shown in the following figure:

[0030] Figure 7 The main circuit schematic diagram of the converter provided by the embodiment of the application is shown in the following figure.

[0031] Wherein, 1 is the cabinet body, 2 is the main transformer power module cavity, 3 is the auxiliary transformer power module cavity, 4 is the transformer cavity, 5 is the reactor cavity, 6 is the main transformer rectifier power module cavity, 7 is the water cooling cavity, 8 is the water-air heat exchanger cavity, 9 is the control unit cavity, 10 is the wiring cavity, 11 is the main transformer support capacitor cavity, 12 is the auxiliary transformer support capacitor cavity, 13 is the main transformer power module, 14 is the auxiliary transformer power module, 15 is the transformer, 16 is the reactor, 17 is the main transformer rectifier power module, 18 is the water pump, 19 is the water tank, 20 is the main water inlet pipe, 21 is the main water outlet pipe, 22 is the water-air heat exchanger, 23 is the main transformer support capacitor, 24 is the auxiliary transformer support capacitor, 25 is the main transformer common DC low inductance bus, 26 is the main transformer quick plug, 27 is the first water inlet pipe, 28 is the first water outlet pipe, 29 is the second water inlet pipe, 30 is the second water outlet pipe, 31 is the control interface, 32 is the auxiliary transformer cable interface, 33 is the water inlet pipe interface, 34 is the water outlet pipe interface, 35 is the overhead line cable interface, 36 is the braking resistor cable interface, 37 is the input and output cable interface, 38 is the bottom plate, 39 is the cushion block, 40 is the reinforcing beam, and 41 is the bottom plate crossbeam. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0033] The converter provided by the embodiment of the present application comprises a cabinet body 1 and a water cooling heat dissipation system arranged in the cabinet body 1.

[0034] It should be noted that the present scheme adopts a water cooling heat dissipation mode, that is, the cooling of each heat dissipation component is realized through the heat dissipation water circuit, so as to avoid the introduction of an air duct structure, thereby simplifying the heat dissipation structure of the converter, helping to realize the design of reducing the volume of the converter cabinet body 1, and being conducive to improving the compatibility of the converter to facilitate the expansion of the structure. In addition, the cabinet body 1 is provided with a plurality of heat dissipation cavities for arranging corresponding heat dissipation components, which can avoid the installation interference of each heat dissipation component.

[0035] From the above technical solutions can be seen, the converter provided by the embodiment of the application places different components to be cooled in corresponding cavities to be cooled, and uses a water cooling cooling method to cool the components, which not only simplifies the layout of the components to be cooled, so as to facilitate the converter to obtain better maintainability, but also greatly improves the heat dissipation performance of the converter, effectively enhances the current output capability of the converter, and at the same time, helps the converter to reduce the volume and weight.

[0036] Specifically, as shown in Figure 3 and Figure 4 , the cavity to be cooled includes a power module cavity, a transformer cavity 4, a reactor cavity 5, and / or a main transformer rectifier power module cavity 6;

[0037] The water cooling circuit includes a power module water cooling circuit, a transformer water cooling circuit, a reactor water cooling circuit, and / or a main transformer rectifier power module water cooling circuit; the power module water cooling circuit is arranged in the transformer cavity; the transformer water cooling circuit is arranged in the transformer cavity 4; the reactor water cooling circuit is arranged in the reactor cavity 5; and the main transformer rectifier power module water cooling circuit is arranged in the main transformer rectifier power module cavity 6. That is, in the present solution, the power module, the transformer 4, the reactor 5, and / or the main transformer rectifier power module cavity 6, which are the main components to be cooled, use a water cooling cooling method, which helps to improve the heat dissipation effect of the converter; and the above components are arranged in the corresponding cavities to be cooled, which can make the layout of the converter more compact, greatly facilitating the installation and maintenance of the components to be cooled.

[0038] In the present solution, as shown in Figure 3 , the converter provided by the embodiment of the application further includes a water cooling cavity 7 arranged in the cabinet 1; and the water cooling system further includes a water pump 18 and a water tank 19 arranged in the water cooling cavity 7. Correspondingly, the water tank 19 forms a corresponding cooling circuit with each water cooling circuit through the water pump 18; in addition, the water cooling system is self-contained with cooling liquid and does not need to be supplied with water by the whole vehicle, so as to constitute an independent cooling system, so as to realize independent water cooling of the converter, thereby helping to reduce the dependence of the converter on the water supply of the whole vehicle.

[0039] In order to further optimize the above technical solution, the bottom of the water cooling cavity 7 is provided with a drain port communicated with the outside of the cabinet 1, so as to prevent the water leakage of the water cooling cavity 7 from affecting the internal components of the cabinet 1, so as to ensure the safe operation of the converter.

[0040] In the present solution, as shown in Figure 4 , the converter provided by the embodiment of the application further includes an auxiliary cooling system; the auxiliary cooling system includes a water-air heat exchanger 22; and the water cooling system further includes an auxiliary heat exchange water circuit; the auxiliary heat exchange water circuit is connected to the water-air heat exchanger 22, so that the water cooling system provides cooling water for the water-air heat exchanger 22, thereby facilitating the use of the water cooling system.

[0041] The water-air heat exchanger 22 comprises a power module heat exchange branch, a transformer heat exchange branch and / or a common DC low inductance busbar heat exchange branch. That is, the water-air heat exchanger 22 is used to further cool the heat of the power module, the transformer and / or the common DC low inductance busbar which is not taken away by the water cooling heat dissipation system in the cabinet 1, so as to further ensure the internal heat dissipation effect of the converter and ensure the safe operation of the converter.

[0042] Specifically, as shown in Figure 4 The converter provided by the embodiment of the present application further comprises a water-air heat exchanger cavity 8 arranged in the cabinet 1 and used for arranging the water-air heat exchanger 22. This design is to facilitate the installation and maintenance of the water-air heat exchanger 22. Moreover, the water-air heat exchanger cavity 8 is opposite to the water cooling cavity 7, which helps to simplify the connection pipeline structure of the water cooling heat dissipation system and the water-air heat exchanger 22 and is also conducive to improving the compactness of the structure of the converter.

[0043] In the present scheme, the cavity to be cooled comprises a power module cavity, a transformer cavity 4 and / or a main transformer rectifier power module cavity 6.

[0044] As shown in Figure 3 and Figure 4 The converter further comprises a plurality of cavities which are not used for heat dissipation and arranged in the cabinet 1, and each cavity which is not used for heat dissipation is used for arranging a corresponding component which is not used for heat dissipation. The cavities which are not used for heat dissipation comprise a control unit cavity 9, a wiring cavity 10 and / or a support capacitor cavity.

[0045] The transformer cavity 4 is located at the bottom of the cabinet 1, so as to reduce the structural gravity center of the converter and facilitate better stability. The wiring cavity 10 is opposite to the transformer cavity 4 in the front-rear direction. The power module cavity is opposite to the support capacitor cavity in the front-rear direction. The main transformer rectifier power module cavity 6 is opposite to the control unit cavity 9 in the front-rear direction. That is, in the present scheme, two cavities which are associated with each other are arranged in opposite positions in the cabinet 1, which facilitates the simplification of the connection structure of the corresponding two components and helps to simplify the structural layout of the converter, thereby being conducive to improving the compactness of the structure of the converter.

[0046] Specifically, the cavity to be cooled comprises a power module cavity. The cavity which is not used for heat dissipation comprises a support capacitor cavity.

[0047] As shown in Figure 3 The power module cavity comprises a main transformer power module cavity 2 and an auxiliary transformer power module cavity 3. The main transformer power module cavity 2 is arranged below the front part of the cabinet 1. The auxiliary transformer power module cavity 3 is arranged above the front part of the cabinet 1. That is, the main transformer power module cavity 2 and the auxiliary transformer power module cavity 3 form an upper-lower cavity structure, so as to arrange the main transformer power module 13 which has a relatively large weight at the bottom of the front part of the cabinet 1.

[0048] As shown in Figure 4As shown, the support capacitor cavity comprises: a main transformer support capacitor cavity 11 and an auxiliary transformer support capacitor cavity 12; the main transformer support capacitor cavity 11 is arranged below the rear part of the cabinet body 1 and is in alignment with the main transformer power module cavity 2; and the auxiliary transformer support capacitor cavity 12 is arranged above the rear part of the cabinet body 1 and is in alignment with the auxiliary transformer power module cavity 3. That is, in order to separate the power module and the support capacitor in front and back and arrange them in a centralized manner, this design can greatly reduce the weight of the module, and also helps to greatly enhance the maintenance of the module.

[0049] In order to further optimize the above technical solutions, the converter provided by the embodiment of the present application further comprises: a main transformer common DC low-inductance bus 25, an auxiliary transformer common DC low-inductance bus, a main transformer quick plug 26 and an auxiliary transformer quick plug.

[0050] The main transformer common DC low-inductance bus 25 and the auxiliary transformer common DC low-inductance bus are both arranged in the middle part of the cabinet body 1; the main transformer common DC low-inductance bus 25 is used for fixedly connecting the main transformer support capacitor 23; and the main transformer quick plug 26 is used for connecting the main transformer power module 13 and the main transformer common DC low-inductance bus 25, as shown. Figure 5 Similarly, the auxiliary transformer common DC low-inductance bus is used for fixedly connecting the auxiliary transformer support capacitor 24; and the auxiliary transformer quick plug is used for connecting the auxiliary transformer power module 14 and the auxiliary transformer common DC low-inductance bus. That is, the main transformer common DC low-inductance bus 25 and the auxiliary transformer common DC low-inductance bus are mutually isolated and independent, are both arranged in the middle part of the cabinet body 1, and are respectively connected with the corresponding power module and the corresponding support capacitor in front and back, so as to reduce the stray inductance between the power module and the support capacitor; in addition, the power module and the support capacitor are designed in a separated manner, which helps to reduce the weight of the module; and moreover, the quick plug can be used to realize the quick butt joint of the two, which is convenient for the maintenance of the module.

[0051] The present application will be further described in combination with specific embodiments:

[0052] The embodiment of the present application provides a novel mine truck converter which is compact in product structure, good in maintainability, high in heat dissipation performance, small in module volume and light in self weight, and is particularly suitable for mine electric wheel trucks as a core component of a mine truck electric transmission system.

[0053] The present application provides a novel water-cooled mine truck converter cabinet, which is used to solve the technical problems of large floor area, large module self weight, poor maintainability, complex layout, complex heat dissipation structure, low compatibility and difficulty in expansion, and low heat dissipation energy efficiency of the mine truck converter cabinet in the prior art.

[0054] The technical scheme of the present application is described in detail:

[0055] The novel mining traction converter provided by the application comprises a converter framework, a cabinet door, a control unit, power modules arranged in a cabinet body, support capacitors, a transformer, a reactor, a water-air heat exchange and heat dissipation system in the cabinet, a water-cooling heat dissipation system, and an electrical connection system.

[0056] The application adopts a main-auxiliary integrated design, the main variable system drives the traction motor to work, and the auxiliary variable system directly supplies the water-cooling system, so that the water-cooling power supply energy is saved.

[0057] The front (corresponding to the front part of the converter) and the back (corresponding to the rear part of the converter) of the converter can be maintained, and doors are arranged on the front and the back. The front of the converter is provided with main variable inverter power modules at the bottom, and the left and right power modules have the same appearance structure and are arranged symmetrically or in the same direction, so that the compactness of the product is improved. The upper part is provided with auxiliary variable inverter power modules and DC-DC power modules, which form an upper and lower cavity structure with the main variable inverter power modules, and the DC-DC power modules transmit the main variable circuit electric quantity to the auxiliary variable through the transformer (as shown in the figure). Figure 7 The control unit cavity is located at the upper part close to the side surface and at a height suitable for frequent operation of a person, and is isolated from other cavities of the cabinet body through a metal plate. Meanwhile, the cables are classified and arranged according to the voltage size and cable type, the cables of different types are not less than the minimum spacing, the internal shielding lines are grounded through double-end shielding clamps, and the high-voltage sampling lines are twisted, so that the EMC performance of the product is improved. The water-cooling cavity is arranged on the other side surface of the upper part of the front, is divided and sealed from other cavities of the cabinet body through a metal plate, and is provided with a separate door, so as to become an independent cavity space. The cavity bottom is provided with a drain port, so as to prevent the water-cooling cavity from leaking water and affecting the internal devices of the cabinet body. The transformer is heavy, and is arranged in the cavity at the bottom of the water-cooling cavity, so as to avoid interference with the modules and reduce the gravity center of the product.

[0058] The back of the converter is provided with a wiring cavity at the bottom corresponding to the transformer, and the braking resistor cables and the overhead line cables are connected through the corresponding positions of the back or the side surface. The main variable support capacitors are arranged at the positions corresponding to the main variable inverter power modules, and the left and right power modules have the same appearance structure and are arranged symmetrically or in the same direction. The incoming and outgoing line cable interfaces are arranged below the main variable capacitors. The auxiliary variable support capacitors are arranged at the positions corresponding to the auxiliary variable power modules at the upper part. The main variable rectifier power modules are arranged at the positions corresponding to the control unit cavity at the upper part, are side-mounted on the cabinet body slide rails, and are connected to the common DC low-inductance bus through the bus bars. The cabinet water-air heat exchangers and the reactors are arranged at the positions corresponding to the water-cooling cavity, wherein the water-air heat exchangers are arranged at the upper part and are used for cooling the heat emitted by the cables, the bus bars, the transformer, the reactors and the power modules in the cabinet, and the reactors are arranged below the heat exchangers and above the wiring cavities.

[0059] As shown in the figure, Figure 6As shown, the cabinet body framework is made of bent and welded sheet metal parts, and through simulation optimization, a pad 39 is welded at the bottom of each mounting hole at the bottom of the cabinet body bottom plate 38, and a bent beam (reinforcing beam 40) is used to cover the pad 39 and the bottom plate 38 and is welded together, thereby reducing the weight of the cabinet body framework.

[0060] The power module and the support capacitor are connected through the common DC low-inductance busbar, the main transformer power module cabinet is arranged at the lower part of the front face, the side is mounted on the cabinet slide rail and is connected to the main transformer common DC low-inductance busbar through quick insertion, the support capacitor is arranged at the back of the cabinet and is connected to the common DC low-inductance busbar through bolts; the auxiliary transformer power module is arranged at the upper part of the front face of the cabinet, the side is mounted on the cabinet slide rail and is connected to the auxiliary transformer common DC low-inductance busbar through quick insertion, and the support capacitor is arranged at the back of the cabinet and is connected to the auxiliary transformer common DC low-inductance busbar through bolts. The main transformer low-inductance busbar and the auxiliary transformer low-inductance busbar are isolated and independent, are arranged in the middle of the cabinet, and are connected to the power module and the corresponding support capacitor in front and back, respectively, so that the stray inductance between the module and the capacitor is reduced. The power module is connected to the low-inductance busbar through quick insertion, the module and the capacitor are separated and arranged in front and back, so that the weight of the module is greatly reduced, and the installation and removal maintainability of the module is greatly enhanced.

[0061] As shown in Figure 2 The auxiliary transformer cable interface is arranged on the side of the cabinet wiring cavity. The braking resistance cable interface is arranged on the side close to the braking resistance cabinet, and the control interface is arranged on the side close to the cab, as shown in Figure 1

[0062] The water cooling system comprises a water pump, a water tank, a water-air heat exchanger, water pipes, water joint (including quick joint), water valve, pressure sensor and temperature sensor, and is provided with cooling liquid without requiring water supply of the whole vehicle, and constitutes an independent cooling system.

[0063] The power module adopts a water-cooled plate radiator, the water pump, the water tank and other water system devices are arranged in the water cooling cavity, the water inlet hard branch pipe is arranged at the lower part of the module, the water outlet hard branch pipe is arranged at the upper part of the module, and the two are connected to the water inlet and outlet interfaces of the power module through water inlet and outlet hoses and quick plugs, respectively. Two water inlet and outlet pipes supply water for heat dissipation of the upper and lower power modules, are connected to the main water inlet and outlet pipes in the water cooling cavity in parallel, are then connected to the water pump, and then the water pipes are extended out of the cabinet and connected to the external water seal heat exchanger. The water tank is connected to the water inlet and outlet pipes in parallel or the main water outlet pipe in series, and the remaining heat dissipation components in the cabinet, including the cabinet water-air heat exchanger, are connected to the water inlet and outlet branch hard pipes in parallel through the water inlet and outlet hoses. In order to ensure the assembly, the excess part of the water pipe is divided into two sections by a pipe joint.

[0064] The water-air heat exchanger of the main water cooling is arranged outside the cabinet, and in particular, can also be arranged inside the cabinet.

[0065] The present application has the following beneficial effects:

[0066] ​1. The power modules and supporting capacitors are connected via a common DC low-inductance busbar. The main transformer power module cabinet is located at the lower front, side-mounted on the cabinet rails and connected to the main transformer's common DC low-inductance busbar via quick-connect fittings. The supporting capacitors are located at the back of the cabinet and directly connected to the common DC low-inductance busbar via bolts. The auxiliary transformer power module is located at the upper front, side-mounted on the cabinet rails and connected to the auxiliary transformer's common DC low-inductance busbar via quick-connect fittings. The supporting capacitors are located at the back of the cabinet and directly connected to the auxiliary transformer's common DC low-inductance busbar via bolts. The main transformer's low-inductance busbar and the auxiliary transformer's low-inductance busbar are isolated and independent, located in the middle of the cabinet, connecting the power modules and corresponding supporting capacitors at the front and rear respectively, reducing stray inductance between the modules and capacitors. The power modules are connected to the low-inductance busbar via quick-connect fittings. The modules and capacitors are separated and centrally arranged, greatly reducing module weight and significantly enhancing the ease of assembly, disassembly, and maintenance.

[0067] 2. On the front of the converter, the main transformer inverter power module is located at the bottom. The left and right power modules have identical shapes and structures. The auxiliary transformer inverter power module and DC-DC power module are located at the top, forming an upper and lower cavity structure with the main transformer inverter power module. The control unit cavity is located at the top near the side, and the water-cooling cavity is located on the other side of the upper front, separated from other cavities of the cabinet by a metal plate and sealed with a separate door, forming an independent cavity space. The transformer is placed separately in the bottom cavity of the water-cooling cavity. On the back of the converter, the wiring cavity is located at the bottom corresponding to the transformer. The main transformer support capacitor is located at the position corresponding to the main transformer inverter power module. The left and right power modules have identical shapes and structures. The incoming and outgoing cable interfaces are located below the main transformer capacitor. The auxiliary transformer support capacitor is located at the position corresponding to the auxiliary transformer power module at the top. The main transformer rectifier power module is located at the position corresponding to the control unit cavity at the top. The cabinet water-air heat exchanger and reactor are distributed at the positions corresponding to the water-cooling cavity. The water-air heat exchanger is located at the top, and the reactor is installed below the heat exchanger and above the wiring cavity. This improves the product's compactness, making it easier to install and maintain.

[0068] 3. The water-cooling cavity is separated from other cavities of the cabinet by a metal plate and sealed. A drain outlet is provided at the bottom of the cavity facing outwards from the cabinet to effectively prevent water leakage from the water-cooling cavity from affecting the internal components of the cabinet.

[0069] 4. Water system components such as water pumps and water tanks are arranged in the water-cooling chamber. The inlet rigid branch pipe is located at the bottom of the module, and the outlet rigid branch pipe is located at the top of the module. They are connected to the power module's inlet and outlet water interfaces via inlet and outlet hoses and quick-connect plugs, respectively. These two water supply lines supply water for cooling the upper and lower power modules. The main inlet and outlet water pipes, connected in parallel within the water-cooling chamber, are then connected to the water pump. The water pipes extend outside the cabinet and connect to the external water-air heat exchanger. The water tank is connected in parallel to the inlet and outlet water pipes or in series with the main outlet water pipe. Other cooling components inside the cabinet, including the internal water-air heat exchanger, are connected in parallel to the inlet and outlet rigid branch pipes via inlet and outlet hoses. Excessively long sections of the water pipes are divided into two parts using pipe fittings, ensuring assemblability, enhancing the aesthetics of the water system, and improving the flow matching capability of the water system.

[0070] 5. The water-air heat exchanger inside the cabinet is located at the upper back of the cabinet and is used to cool the heat dissipated from the cables, busbars, transformers, reactors and power modules inside the cabinet that has not been carried away by the water cooling system.

[0071] 6. For example Figure 2 As shown, the input and output cable interfaces are located at the bottom of the back of the cabinet, and the auxiliary transformer cable is located on the side of the cabinet. The wiring cavity in the lower right corner of the back provides a brake cable interface or a wire connection interface, which is conducive to the simplicity of the cable and busbar wiring inside the cabinet.

[0072] 7. The control unit cavity and cabinet are isolated by metal plates. Cables are classified and wired according to voltage and type. The spacing between different types of cables shall not be less than the minimum. The internal shielded wires are grounded with double-ended shielding clamps. The high-voltage sampling wires are twisted pairs to improve the product's EMC.

[0073] 8. The transformer, reactor and power module are placed in different cavities to avoid interference between modules. The transformer is heavy, so it is placed at the bottom of the cabinet to lower the center of gravity of the product and improve the product's shock resistance.

[0074] 9. The cabinet frame is made of sheet metal parts by bending and welding. While meeting the requirements for cabinet strength and vibration, through optimization, a pad is welded under each mounting hole on the bottom of the cabinet base plate. Then, a bending beam is used to cover the pad and weld it together with the base plate, which greatly reduces the weight of the cabinet frame.

[0075] Alternatives to the present invention:

[0076] 1. The water-cooling system consists of a water pump, water tank, water-air heat exchanger, water pipes, water connectors (including quick connectors), water valves, pressure sensors, and temperature sensors. It has its own coolant and does not require a vehicle-wide water supply, forming an independent cooling system. Alternatively, the water pump, water tank, and water-air heat exchanger can be omitted, with water cooling provided by the vehicle-wide water supply.

[0077] 2. The water-air heat exchanger for main water cooling is located outside the cabinet, or alternatively, inside the cabinet.

[0078] 3. The power module and its supporting capacitor can be arranged symmetrically or in the same direction.

[0079] The various embodiments in the specification are described in progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between various embodiments can be referred to each other.

[0080] The above description of disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A current transformer, characterized by A mine vehicle comprises a cabinet (1) and a water cooling heat dissipation system arranged in the cabinet (1); the cabinet (1) is provided with a plurality of heat dissipation cavities, each of which is used for arranging a corresponding heat dissipation component; the water cooling heat dissipation system comprises a plurality of heat dissipation water circuits, each of which is arranged in a corresponding heat dissipation cavity; The heat dissipation cavities comprise a power module cavity, a transformer cavity (4), a reactor cavity (5) and / or a main transformer rectifier power module cavity (6); The heat dissipation water circuits comprise a power module heat dissipation water circuit, a transformer heat dissipation water circuit, a reactor heat dissipation water circuit and / or a main transformer rectifier power module heat dissipation water circuit; the power module heat dissipation water circuit is arranged in the transformer cavity; the transformer heat dissipation water circuit is arranged in the transformer cavity (4); the reactor heat dissipation water circuit is arranged in the reactor cavity (5); and the main transformer rectifier power module heat dissipation water circuit is arranged in the main transformer rectifier power module cavity (6); Further comprising a water cooling cavity (7) arranged in the cabinet (1); the water cooling heat dissipation system further comprises a water pump (18) and a water tank (19) arranged in the water cooling cavity (7); The heat dissipation cavities comprise a power module cavity, a transformer cavity (4) and / or a main transformer rectifier power module cavity (6); The converter further comprises a plurality of non-heat dissipation cavities arranged in the cabinet (1), each of which is used for arranging a corresponding non-heat dissipation component; the non-heat dissipation cavities comprise a control unit cavity (9), a wiring cavity (10) and / or a support capacitor cavity; The transformer cavity (4) is located at the bottom of the cabinet (1), the wiring cavity (10) is aligned with the transformer cavity (4) in the front-rear direction, the power module cavity is aligned with the support capacitor cavity in the front-rear direction, and the main transformer rectifier power module cavity (6) is aligned with the control unit cavity (9) in the front-rear direction.

2. The current transformer of claim 1, wherein, The water cooling cavity (7) is provided with a drain port communicated with the outside of the cabinet (1).

3. The current transformer of claim 1, wherein Further comprising: An auxiliary cold heat dissipation system; The auxiliary cold heat dissipation system comprises a water-air heat exchanger (22); the water cooling heat dissipation system further comprises an auxiliary heat exchange water circuit; and the auxiliary heat exchange water circuit is connected to the water-air heat exchanger (22); The water-air heat exchanger (22) comprises a power module heat exchange branch, a transformer heat exchange branch and / or a common DC low-inductance busbar heat exchange branch.

4. The current transformer of claim 3, wherein Further comprising: A water-air heat exchanger cavity (8) arranged in the cabinet (1) and used for arranging the water-air heat exchanger (22); the water-air heat exchanger cavity (8) is aligned with the water cooling cavity (7).

5. The current transformer of claim 1, wherein, The heat dissipation cavities comprise a power module cavity; and the non-heat dissipation cavities comprise a support capacitor cavity; The power module cavity comprises a main transformer power module cavity (2) and an auxiliary transformer power module cavity (3); the main transformer power module cavity (2) is arranged below the front part of the cabinet (1); and the auxiliary transformer power module cavity (3) is arranged above the front part of the cabinet (1). The support capacitor cavity comprises a main transformer support capacitor cavity (11) and an auxiliary transformer support capacitor cavity (12); the main transformer support capacitor cavity (11) is arranged below the rear part of the cabinet (1) and is in alignment with the main transformer power module cavity (2); the auxiliary transformer support capacitor cavity (12) is arranged above the rear part of the cabinet (1) and is in alignment with the auxiliary transformer power module cavity (3).

6. The current transformer of claim 1, wherein, Further comprising: A main transformer common DC low-inductance busbar (25), an auxiliary transformer common DC low-inductance busbar, a main transformer fast plug (26) and an auxiliary transformer fast plug; The main transformer common DC low-inductance busbar (25) and the auxiliary transformer common DC low-inductance busbar are both arranged in the middle part of the cabinet (1); the main transformer common DC low-inductance busbar (25) is used for fixedly connecting a main transformer support capacitor (23); the main transformer fast plug (26) is used for connecting a main transformer power module (13) and the main transformer common DC low-inductance busbar (25); the auxiliary transformer common DC low-inductance busbar is used for fixedly connecting an auxiliary transformer support capacitor (24); and the auxiliary transformer fast plug is used for connecting an auxiliary transformer power module (14) and the auxiliary transformer common DC low-inductance busbar.

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