Functional module, power unit, frequency converter and frequency conversion skid

Abstract

Provided in the present application are a functional module, a power unit, a frequency converter and a frequency conversion skid. The functional module is a rectifier module or an inverter module. The functional module comprises: a heat sink, the heat sink having a first fixing surface and a second fixing surface which are arranged opposite each other; a side plate assembly, the side plate assembly being arranged around the periphery of the heat sink, and two ends of the side plate assembly respectively protruding from the first fixing surface and the second fixing surface so as to respectively enclose a first mounting cavity and a second mounting cavity; a plurality of power devices respectively arranged in the first mounting cavity and the second mounting cavity; and a busbar connected to the plurality of power devices, wherein a connecting portion of the busbar extends beyond the side plate assembly.

Description

Functional modules, power units, frequency converters, and frequency conversion skids

[0001] This application claims priority to the following patent applications filed on December 27, 2024, with China National Intellectual Property Administration (CNIPA), application number 2024232576517, entitled "Variable Frequency Sled". This application also claims priority to the following patent applications filed on December 27, 2024, with CNIPA, application number 202423258392X, entitled "Functional Module and Variable Frequency Drive Having the Same". Finally, this application claims priority to the following patent applications filed on December 27, 2024, with CNIPA, application number 2024232625797, entitled "Power Unit and Variable Frequency Drive Having the Same". Technical Field

[0002] This application relates to the field of variable frequency skid structure technology, and more specifically, to a functional module, a power unit, a frequency converter, and a variable frequency skid. Background Technology

[0003] Currently, in the field of fracturing technology, in order to reduce energy emissions and pollution, electricity is typically used as the power source, with motors driving the fracturing equipment. The frequency converter, as a key component of the drive motor, functions to convert the on-site AC power into AC power with controllable voltage and frequency, driving the motor and adjusting its speed.

[0004] However, the functional modules of existing frequency converter equipment (which can be rectifier modules or inverter modules) are large in size, have an insufficiently compact structural layout, and are relatively complex in structure.

[0005] Application content

[0006] According to one aspect of this application, a functional module is provided, which is a rectifier module or an inverter module; the functional module includes: a heat sink having a first fixed surface and a second fixed surface disposed opposite to each other; a side plate assembly surrounding the periphery of the heat sink, with both ends of the side plate assembly protruding from the first fixed surface and the second fixed surface respectively to form a first mounting cavity and a second mounting cavity respectively; a plurality of power devices disposed in the first mounting cavity and the second mounting cavity respectively; and a busbar connected to the plurality of power devices, with the connecting portion of the busbar extending out of the side plate assembly.

[0007] Furthermore, a wire harness fixing component is provided on the first fixing surface and / or the second fixing surface.

[0008] Furthermore, the side panel assembly is provided with at least one clearance opening, which is disposed opposite to the busbar connection portion. The busbar connection portion passes through the clearance opening and extends out of the side panel assembly through the clearance opening.

[0009] Furthermore, at least a portion of the busbar connection abuts against the periphery of the clearance opening.

[0010] Furthermore, the functional module is a rectifier module, and the functional module also includes: a limiting part, which is connected to the side plate assembly. The limiting end of the limiting part is installed at least part of the clearance opening and forms a limiting space adapted to the connecting part with the clearance opening. The limiting end of the limiting part and the clearance opening are respectively used to abut and limit the connection with both sides of the busbar connecting part.

[0011] Furthermore, the side panel assembly includes a first side panel and a second side panel connected at a preset angle, the busbar connection part includes an inlet busbar and an outlet busbar, and the clearance opening part includes a first clearance opening and a second clearance opening; the first side panel is provided with a first clearance opening, the inlet busbar passes through the first clearance opening and extends out of the side panel assembly; the second side panel is provided with a second clearance opening, the outlet busbar passes through the second clearance opening and extends out of the side panel assembly.

[0012] Furthermore, the functional module is a rectifier module, with a portion of multiple power devices disposed in the first mounting cavity and another portion of multiple power devices disposed in the second mounting cavity, and the portion of multiple power devices and the other portion of multiple power devices disposed independently; there are two busbars, one busbar disposed in the first mounting cavity and connected to a portion of multiple power devices, and the other busbar disposed in the second mounting cavity and connected to the other portion of multiple power devices, with the connection portions of one busbar and the connection portions of the other busbar disposed at intervals.

[0013] Furthermore, the heat sink is a cooling plate, and a heat exchange channel is provided inside the cooling plate; the functional module is an inverter module, and a power supply mounting plate is also provided on the part of the first fixed surface near the heat exchange channel and / or on the part of the second fixed surface near the heat exchange channel, and the drive power supply is detachably mounted on the power supply mounting plate.

[0014] Furthermore, the functional module is an inverter module, and the busbar includes a first connecting busbar and a second connecting busbar that are interconnected. The first connecting busbar is connected to the portion of a plurality of power devices located in the first mounting cavity, and the second connecting busbar is connected to the portion of a plurality of power devices located in the second mounting cavity. The first connecting portion of the first connecting busbar and the second connecting portion of the second connecting busbar both extend out of the side plate assembly.

[0015] Further, the first connecting row includes a first plate, a second plate, and a third plate connected in sequence. The first plate is disposed within a first mounting cavity and connected to the portion of the plurality of power devices located in the first mounting cavity. The second plate is provided with a first connecting portion, and the third plate is located within a second mounting cavity. The second connecting row includes a fourth plate and a fifth plate connected in sequence. The fourth plate is disposed within a second mounting cavity and connected to the portion of the plurality of power devices located in the second mounting cavity. The fifth plate is provided with a second connecting portion. The third plate is connected to the fourth plate. And / or, at least a portion of the fifth plate is disposed opposite to the second plate. The first connecting portion and the second connecting portion are spaced apart.

[0016] Furthermore, the functional module also includes: a first mounting cover, which is disposed on one side of the side panel assembly to seal the first mounting cavity; and / or, a second mounting cover, which is disposed on the other side of the side panel assembly to seal the second mounting cavity.

[0017] Furthermore, a first positioning groove is provided on one side of the heat sink, the first positioning groove being adapted to the shape of its corresponding power device; and / or, a second positioning groove is provided on the other side of the heat sink, the second positioning groove being adapted to the shape of its corresponding power device.

[0018] Furthermore, the functional module also includes: an interface board, which is mounted outside the side panel assembly, and is provided with a liquid inlet and a liquid outlet, both of which are connected to the heat exchange channel of the heat sink; and / or a connecting component, which is disposed on the side panel assembly, and includes an optical path connecting connector and / or a circuit connecting connector located outside the side panel assembly.

[0019] This application also provides a frequency converter, including the functional modules provided above.

[0020] According to another aspect of this application, a power unit is provided, comprising: an inverter module, a rectifier module, a first capacitor module, and a second capacitor module, wherein the inverter module and the first capacitor module are arranged side by side, and the rectifier module and the second capacitor module are arranged side by side; a second connecting busbar, a portion of which is connected to the inverter module, and another portion of which is connected to the first capacitor module; and a first connecting busbar, a portion of which is connected to the rectifier module, and another portion of which is connected to the second capacitor module.

[0021] Furthermore, the inverter module includes a first housing, a first connecting busbar, and a first power component. The first housing has a first opening, the first power component is installed inside the first housing, the first connecting busbar is connected to the first power component, a first connecting portion of the first connecting busbar is located at the first opening, and at least a portion of the second connecting busbar is located at the first opening and connected to the first connecting portion.

[0022] Furthermore, the rectifier module includes a second housing, a second connecting busbar, and a second power component. The second housing has a second opening, the second power component is installed inside the second housing, the second connecting busbar is connected to the second power component, a second connecting portion of the second connecting busbar is located at the second opening, and at least a portion of the first connecting busbar is located at the second opening and connected to the second connecting portion.

[0023] Furthermore, the inverter module, rectifier module, first capacitor module, and second capacitor module are all box-type structures; the first capacitor module and second capacitor module are located below the inverter module and rectifier module, respectively.

[0024] Furthermore, there are multiple inverter modules, which are arranged at intervals in a first preset direction. There are also multiple first capacitor modules, which are arranged at intervals in the first preset direction. The multiple first capacitor modules and the multiple inverter modules are arranged at intervals along a second preset direction. The multiple first capacitor modules and the multiple inverter modules are arranged in a one-to-one correspondence. A part of the second connecting busbar is connected to the multiple inverter modules, and another part of the second connecting busbar is connected to the multiple first capacitor modules.

[0025] Furthermore, the second connecting busbar is provided with a clearance notch, which is configured to avoid the inverter outlet of the inverter module; and / or, the second connecting busbar is provided with a first clearance hole, which is configured opposite to the first connection part of the inverter module; and / or, the second connecting busbar is provided with a second clearance hole, which is configured opposite to the first access part of the first capacitor module.

[0026] Furthermore, a third clearance hole is provided on the first connecting busbar, and the third clearance hole is disposed opposite to the second connection part of the rectifier module; and / or, a fourth clearance hole is provided on the first connecting busbar, and the fourth clearance hole is disposed opposite to the second access part of the second capacitor module.

[0027] Furthermore, the power unit also includes: a support frame, including a support bracket, and a first support plate and a second support plate spaced apart on the support bracket, the first support plate being positioned above the second support plate; wherein, a first capacitor module and a second capacitor module are spaced apart on the second support plate, and an inverter module and a rectifier module are spaced apart on the first support plate; and / or, the first support plate and / or the second support plate are provided with heat dissipation holes.

[0028] Furthermore, the power unit also includes: a connecting line that is connected to the inverter output of the inverter module; and a line support that has a support hole adapted to the connecting line, through which the connecting line passes.

[0029] Furthermore, at least one of the inverter module and the rectifier module is a functional module, as described above.

[0030] This application also provides a frequency converter, including the power unit provided above.

[0031] According to another aspect of the present invention, a frequency converter skid is provided, comprising: a transformer unit, the input terminal of which is selectively connected to or disconnected from an external power supply, the transformer unit being used to reduce the voltage of the external power supply, the transformer unit having a main output terminal and an auxiliary output terminal; a power unit, the input terminal of which is connected to the main output terminal of the transformer unit, the power unit being used to convert the AC power output from the main output terminal into AC power with a preset voltage and a preset frequency; and an electrical device, the power supply port of the electrical device being connected to the auxiliary output terminal.

[0032] Furthermore, the transformer unit includes a main transformer and an auxiliary transformer, the main transformer having a main output terminal and the auxiliary transformer having an auxiliary output terminal; wherein, the electrical equipment includes at least one of a fan, a coolant-driven pump, an air conditioner, and a control system; the power supply port of the fan and / or the power supply port of the coolant-driven pump are connected to the main output terminal or the auxiliary output terminal; the air conditioner and the control system are connected to the auxiliary output terminal.

[0033] Furthermore, the frequency converter skid also includes: a housing, in which the transformer unit is housed, and the housing has spaced air inlets and outlets; wherein, the electrical equipment includes a fan, the power supply port of the fan is connected to the auxiliary output terminal, and the fan is located at the air inlet or the air outlet.

[0034] Furthermore, the variable frequency skid also includes: a filter element, which is disposed at the air inlet and is used to filter the air passing through the air inlet; and / or a dustproof element, which is disposed at the air inlet and / or air outlet and is movable to move to an open position that avoids the air inlet and / or air outlet, and to a closed position that blocks the air inlet and / or air outlet.

[0035] Furthermore, the frequency converter skid also includes a housing, in which the transformer unit is disposed; wherein, the electrical equipment includes a water-cooled radiator having heat exchange pipes, at least a portion of which is disposed within the housing; and / or, the electrical equipment includes an air conditioner, in which the indoor unit of the air conditioner is disposed within the housing.

[0036] Furthermore, the electrical equipment also includes: a temperature detection element, installed inside the enclosure; and / or a dehumidification element, installed inside the enclosure; and / or a heating element, installed inside the enclosure; and / or an alarm element, installed inside the enclosure, which sounds an alarm when it detects smoke.

[0037] Furthermore, the frequency converter skid also includes an input unit, the input of which can be selectively connected to or disconnected from an external power supply, and the input of the transformer unit is connected to the output of the input unit; the input unit includes a pre-charge module, which is used to magnetize and charge the capacitors of the transformer unit and / or the power unit.

[0038] Furthermore, the pre-charge module includes: a charging resistor, which limits the current in the circuit when the input terminal of the incoming line unit is connected to an external power source; a vacuum contactor, connected to the charging resistor, which disconnects the circuit when the current in the circuit exceeds a preset current; and a circuit breaker, which connects or disconnects the circuit.

[0039] Furthermore, the frequency converter skid also includes an incoming line unit and a housing. The housing has a first receiving cavity, a second receiving cavity, and a third receiving cavity arranged at intervals. The incoming line unit is disposed in the first receiving cavity, the transformer unit is disposed in the second receiving cavity, and the power unit is disposed in the third receiving cavity. The first receiving cavity and the third receiving cavity are respectively located on both sides of the second receiving cavity. And / or, a first heat dissipation unit is disposed in the second receiving cavity. And / or, a second heat dissipation unit is disposed in the third receiving cavity.

[0040] Furthermore, the power unit includes a rectifier module and an inverter module; wherein both the rectifier module and the inverter module include heat sinks with heat dissipation channels; the inverter skid also includes heat dissipation pipes connected to the heat dissipation channels, and the heat dissipation pipes are separately disposed in different chambers from the power unit; and / or, the power unit also includes a frame structure, multiple capacitors, a first connecting busbar and a second connecting busbar, wherein the rectifier module, the inverter module and the multiple capacitors are all installed in the mounting slots of the frame structure; the first connecting busbar is used to connect to a portion of the rectifier module and the multiple capacitors; the second connecting busbar is used to connect to another portion of the inverter module and the multiple capacitors.

[0041] Furthermore, the power unit is as described above.

[0042] By applying the technical solution of this application, the power unit can convert the AC power output from the main output terminal into AC power with a preset voltage and frequency to power external fracturing equipment. The AC power output from the auxiliary output terminal can also power the equipment on the variable frequency skid, eliminating the need for external power supplies and avoiding the added complexity of external wiring and operation. By integrating the transformer unit, power unit, and equipment, a highly efficient and compact variable frequency power supply solution is achieved. Specifically, by separating the heat dissipation pipes of the power unit from the power unit itself, the leakage of heat dissipation fluid due to pipe damage can be effectively prevented from affecting the normal operation of the energized power unit, facilitating protection of the power unit and improving equipment stability and lifespan. Simultaneously, the inclusion of adjustable dustproof and filter components ensures the cleanliness of the internal components, further enhancing system reliability and maintenance convenience. In addition, by designing the enclosure as a detachable multi-chamber structure and setting a buffer structure at the connection, it not only facilitates the installation and maintenance of the equipment, but also effectively reduces vibration and noise during operation, thereby improving the overall user experience.

[0043] The modular structure of the frequency converter allows for direct connection between the busbar and the corresponding module, facilitating rapid installation and avoiding the need for separate assembly of numerous modules, thus reducing assembly difficulty. Simultaneously, the modular design facilitates maintenance and upgrades, improving equipment reliability and flexibility. Furthermore, the support frame and wiring supports enhance structural stability, ensuring the safety of power transmission. The overall design is compact, with high space utilization, making it suitable for fracturing processes.

[0044] The optimized configuration improves the structural layout of the functional modules, enhancing their compactness and reducing their overall volume. By mounting multiple power devices on opposite sides of the heat sink, a single heat sink can easily contact multiple devices, enabling simultaneous cooling and ensuring effective heat dissipation. This further optimizes the structural layout. Furthermore, the modular design facilitates rapid assembly and installation in the field, enhancing installation convenience. Attached Figure Description

[0045] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0046] Figure 1 shows a schematic diagram of the structure of a frequency converter skid provided according to an embodiment of this application;

[0047] Figure 2 shows a top view of a variable frequency skid provided according to an embodiment of this application;

[0048] Figure 3 shows a schematic diagram of the internal structure of a frequency converter skid provided according to an embodiment of this application;

[0049] Figure 4 shows a schematic diagram of the internal structure of the third cabinet provided according to an embodiment of this application;

[0050] Figure 5 shows a schematic diagram of the structure of the heat dissipation pipe and the partition plate provided according to an embodiment of this application;

[0051] Figure 6 shows a schematic diagram of the connection structure of the power unit provided according to an embodiment of this application;

[0052] Figure 7 shows a schematic diagram of the structure of a power unit provided according to an embodiment of this application;

[0053] Figure 8 shows a partial structural schematic diagram of a power unit provided according to an embodiment of this application;

[0054] Figure 9 shows a schematic diagram of the structure of the inverter module, rectifier module, first capacitor module and second capacitor module provided according to an embodiment of the present application, placed on a support frame;

[0055] Figure 10 shows a schematic diagram of the structure of the support frame provided according to an embodiment of this application;

[0056] Figure 11 shows a structural schematic diagram of a rectifier module provided according to an embodiment of this application from one perspective;

[0057] Figure 12 shows a structural schematic diagram of a rectifier module provided according to an embodiment of this application from another perspective;

[0058] Figure 13 shows a schematic diagram of the internal structure of a rectifier module provided according to an embodiment of this application;

[0059] Figure 14 shows an exploded view of a portion of the structure of a rectifier module provided according to an embodiment of this application;

[0060] Figure 15 shows an exploded view of a portion of the structure of a rectifier module provided according to an embodiment of this application;

[0061] Figure 16 shows a structural schematic diagram of an inverter module provided according to an embodiment of this application from one perspective;

[0062] Figure 17 shows a structural schematic diagram of an inverter module provided according to an embodiment of this application from another perspective;

[0063] Figure 18 shows a schematic diagram of the internal structure of an inverter module provided according to an embodiment of this application;

[0064] Figure 19 shows an exploded view of a portion of the structure of an inverter module provided according to an embodiment of this application.

[0065] The above-mentioned figures include the following reference numerals: 10, Transformer unit; 20, Power unit; 21, Frame structure; 22, Rectifier module; 23, Inverter module; 24, Capacitor; 25, First connecting busbar; 26, Second connecting busbar; 30, Cabinet; 31, First cabinet; 32, Second cabinet; 33, Third cabinet; 40, Fan; 50, Incoming line unit; 70, Heat dissipation pipe; 80, Partition plate; 231, First outer shell; 2311, First opening; 232, First connecting bar; 2321, First connection part; 233, First power component; 234, Inverter outlet part; 221, Second outer shell; 2211, Second opening; 222, Second connecting bar; 2221, Second connection part; 223, Second power component; 241, First capacitor module; 2411, First access part; 242. Second capacitor module; 2421. Second access section; 27. Intermediate connecting bar; 28. Support frame; 281. Support bracket; 282. First support plate; 283. Second support plate; 284. Heat dissipation through hole; 29. ​​Connecting line; 210. Line support component; 2110. Line fixing component; 910. Heat sink component; 911. First positioning groove; 912. Second positioning groove; 920. Side plate assembly; 921. First side plate; 922. Second side plate; 923. Clearance opening; 9231. First clearance opening; 9232. Second clearance opening; 930. Power device; 940. Busbar; 941. Inlet bar; 9411. First connecting plate; 9412. Second connecting plate; 942. Outlet bar; 943. First connecting row; 9431. First connecting part; 9432. First plate; 9433. Second plate; 9434. Third plate; 944. Second connecting row; 9441. Second connecting part; 9442. Fourth plate; 9443. Fifth plate; 950. Limiting part; 951. First limiting plate; 952. Second limiting plate; 961. First mounting cover; 962. Second mounting cover; 970. Interface plate; 971. Liquid inlet interface; 972. Liquid outlet interface; 980. Connecting component; 981. Optical path connecting connector; 982. Electrical connection connector; 990. Operating handle; 9100. Wiring harness fixing component. Detailed Implementation

[0066] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0067] As shown in Figures 1 to 6, one embodiment of this application provides a frequency converter skid, which includes: a transformer unit 10, a power unit 20, and electrical equipment. The input terminal of the transformer unit 10 can be selectively connected to or disconnected from an external power source. The transformer unit 10 is used to reduce the voltage of the external power source. The transformer unit 10 has a main output terminal and an auxiliary output terminal. The input terminal of the power unit 20 is connected to the main output terminal of the transformer unit 10. The power unit 20 is used to convert the AC power output from the main output terminal into AC power with a preset voltage and a preset frequency. The power supply port of the electrical equipment is connected to the auxiliary output terminal.

[0068] The variable frequency skid provided in this embodiment converts the AC power output from the main output terminal into AC power with a preset voltage and frequency through the power unit 20, facilitating the power supply to external fracturing equipment. The AC power output from the auxiliary output terminal can also power the equipment integrated into the variable frequency skid, eliminating the need for an external power source and avoiding the added complexity of external wiring and operation. Therefore, the variable frequency skid provided in this embodiment solves the technical problem in the prior art where the variable frequency skid requires an external power source to power its equipment, leading to operational inconvenience.

[0069] In this embodiment, the transformer unit 10 includes a main transformer and an auxiliary transformer. The main transformer has a main output terminal, and the auxiliary transformer has an auxiliary output terminal. The electrical equipment includes at least one of a fan 40, a coolant-driven pump, an air conditioner, and a control system. The power supply port of the fan 40 and / or the power supply port of the coolant-driven pump are connected to the main output terminal or the auxiliary output terminal; the air conditioner and the control system are connected to the auxiliary output terminal. Specifically, the fan 40, the coolant-driven pump, the air conditioner, and the control system all require low voltage. Because the main transformer has a large harmonic ratio, which will interfere with the electronic components, the fan 40 and the water pump, which do not contain electronic components, can also use the main transformer to provide low-voltage electricity. The air conditioner and the control system, which contain electronic components, can only be powered by the auxiliary transformer.

[0070] Specifically, the variable frequency skid also includes a housing 30, in which the main frequency converter and the auxiliary frequency converter are installed to effectively protect the main frequency converter and the auxiliary frequency converter.

[0071] In this embodiment, the frequency converter skid also includes a housing 30, and the transformer unit 10 is disposed inside the housing 30. The housing 30 has air inlets and outlets spaced apart. The electrical equipment includes a fan 40, whose power supply port is connected to an auxiliary output terminal. The fan 40 is located at either the air inlet or the air outlet. This structural arrangement facilitates the use of the fan 40 to blow outside air into the housing 30 or to blow air from inside the housing 30 to the outside, thereby effectively cooling the temperature inside the housing 30 and ensuring the normal operation of the structure within the housing 30.

[0072] Specifically, the variable frequency skid also includes a filter element, which is installed at the air inlet and is used to filter the air passing through the air inlet. This structural arrangement can effectively ensure the quality of the air entering the air inlet and prevent external dirt and impurities from entering the housing 30, thereby effectively protecting the structure inside the housing 30.

[0073] Specifically, the frequency converter skid also includes dustproof components. Dustproof components are installed at the air inlet and / or outlet. These components are movable to either an open position that avoids the air inlet and / or outlet, or a closed position that blocks the air inlet and / or outlet. With this structure, when the dustproof components are in the closed position, the enclosure 30 can be effectively sealed, preventing contact with the outside environment and effectively protecting the components inside the enclosure 30. When the dustproof components are in the open position, the air inside the enclosure 30 can communicate with the outside air, facilitating effective air conditioning within the enclosure 30. Generally, this allows the higher-temperature air inside the enclosure 30 to dissipate heat, reducing the temperature inside the enclosure 30 and ensuring the normal operation of the internal structure.

[0074] Specifically, the dustproof component can be louvers or a dustproof cover.

[0075] In this embodiment, the frequency converter skid also includes a housing 30, and the transformer unit 10 is disposed inside the housing 30.

[0076] The electrical equipment includes a water-cooled radiator, which has heat exchange pipes, at least a portion of which are installed in the enclosure 30. This structural arrangement facilitates temperature regulation within the enclosure 30 via the water-cooled radiator, thereby ensuring stable operation of the structure within the enclosure 30 within a suitable temperature range.

[0077] Specifically, the electrical equipment includes an air conditioner, with the indoor unit of the air conditioner installed inside the enclosure 30 to better control and adjust the temperature inside the enclosure 30, and to better ensure that the structure inside the enclosure 30 can operate stably within a suitable temperature range.

[0078] In this embodiment, the electrical equipment also includes a temperature detection device, which is installed inside the housing 30 to facilitate real-time detection of the temperature inside the housing 30.

[0079] Specifically, the electrical equipment also includes a dehumidifier, which is installed inside the enclosure 30 to regulate the humidity inside the enclosure 30 and prevent excessive humidity, thereby ensuring the stable operation of the structure inside the enclosure 30.

[0080] Specifically, the electrical equipment also includes a heating element, which is installed inside the enclosure 30. In this way, when the temperature inside the enclosure 30 is low, the heating element can heat the temperature inside the enclosure 30, preventing the structure inside the enclosure 30 from failing to start normally due to excessively low temperature.

[0081] Specifically, the electrical equipment also includes an alarm device, which is installed inside the enclosure 30. When the alarm device detects smoke, it sounds an alarm. This structural design effectively ensures the safe operation of the frequency converter skid and provides timely alarms in case of fire or other emergencies, preventing abnormal operation.

[0082] In this embodiment, the frequency converter skid also includes an input unit 50, the input terminal of which can be selectively connected to or disconnected from an external power supply. The input terminal of the transformer unit 10 is connected to the output of the input unit 50. The input unit 50 includes a pre-charge module, which is used to magnetize and charge the capacitor 24 of the transformer unit 10 and / or the power unit 20. This ensures that the capacitor 24 can be charged quickly and stably when the equipment starts up, avoiding the large current surge at startup, extending the service life of the capacitor 24 and the entire system, and is particularly suitable for applications requiring frequent starts and stops.

[0083] Specifically, the pre-charge module can magnetize and charge the transformer unit 10 and the capacitor 24 behind it before the main power supply is connected to the transformer unit 10, so as to prevent the impact on the power grid after direct connection to the main power supply and reduce the charging current when powered on.

[0084] In this embodiment, the pre-charge module includes a charging resistor, a vacuum contactor, and a circuit breaker. When the input terminal of the incoming line unit 50 is connected to an external power supply, the charging resistor limits the current in the circuit; the vacuum contactor is connected to the charging resistor; when the current in the circuit exceeds a preset current, the vacuum contactor disconnects the circuit; the circuit breaker connects or disconnects the circuit. Thus, by precisely controlling the charging current, the impact of excessive starting current on the power grid is avoided, and the power supply can be quickly cut off in case of abnormal current, protecting the safe operation of the frequency converter skid. The pre-charge module and vacuum contactor of the frequency converter skid ensure stable current control during power conversion, preventing abnormal current from impacting external operating equipment connected to the frequency converter skid, and improving the operational stability and safety of external operating equipment connected to the frequency converter skid.

[0085] Specifically, the incoming line unit 50 functions as the switching unit for the incoming line system, including switching control of the incoming power supply, acquisition of system voltage and current signals, control of the transformer pre-charging circuit, electricity metering, and electrical protection of the internal system. It mainly includes load switches, incoming circuit breakers or contactors, integrated protection devices, electricity meters, voltage transformers, current transformers, overvoltage protectors, control transformers, pre-charging magnetizers, pre-charging contactors, and the incoming line cabinet.

[0086] The incoming line unit 50 is connected to an external power source via lugs, connectors, etc., and the voltage range of this power source is generally 0.38 to 40 kV. The control transformer is connected to the power source at the incoming line cabinet, converting the high-voltage power source into a low-voltage power source, with a voltage range of generally 100 to 500 V. After passing through a filter, the power is output to the outside to prevent excessive power harmonics from causing downstream equipment failures.

[0087] After the incoming line unit 50 is connected to an external power source, the power supply passes through a load switch and a vacuum circuit breaker before connecting to the high-voltage input terminal of the transformer. Internal voltage transformers (PTs) and current transformers (CTs) collect the voltage and current signals from the incoming line and transmit them to the control system, integrated protection device, and electricity meter. The integrated protection device collects the system's voltage and current to protect downstream equipment and trigger the circuit breaker to trip. The electricity meter measures the amount of electricity used by the system. The control system displays the voltage and current values ​​on the human-machine interface and transmits them to third-party systems. Additionally, the control system controls the pre-magnetization of the transformer by controlling the engagement of the pre-magnetizing contactor and the main circuit breaker, preventing impact on the upstream power grid when the system closes.

[0088] Specifically, the frequency converter skid also includes an inlet unit 50 and a housing 30. The housing 30 has a first receiving cavity, a second receiving cavity, and a third receiving cavity arranged at intervals. The inlet unit 50 is disposed in the first receiving cavity, the transformer unit 10 is disposed in the second receiving cavity, and the power unit 20 is disposed in the third receiving cavity. In this way, it is convenient to place the inlet unit 50, the transformer unit 10, and the power unit 20 in different receiving cavities, so as to facilitate modular management and maintenance and convenient operation.

[0089] Specifically, the first and third receiving cavities are located on both sides of the second receiving cavity, which facilitates the layout of the structure and makes wiring operations of each unit easier.

[0090] Specifically, a first heat dissipation unit is provided in the second receiving cavity to facilitate heat dissipation of the transformer unit 10.

[0091] Specifically, a second heat dissipation unit is provided in the third receiving cavity to facilitate heat dissipation of the power unit 20.

[0092] In this embodiment, the enclosure 30 includes a first cabinet 31, a second cabinet 32, a third cabinet 33 and a support base. The first cabinet 31 has a first receiving cavity, the second cabinet 32 ​​has a second receiving cavity, and the third cabinet 33 has a third receiving cavity.

[0093] Specifically, the first cabinet 31 and the second cabinet 32 ​​are detachably connected, and a first buffer structure is provided at the connection between the first cabinet 31 and the second cabinet 32. This facilitates assembly and helps to prevent the first cabinet 31 and the second cabinet 32 ​​from being subjected to large impacts during transportation and use, thus effectively protecting the first cabinet 31 and the second cabinet 32.

[0094] Specifically, the second cabinet 32 ​​and the third cabinet 33 are detachably connected, and a second buffer structure is provided at the connection between the second cabinet 32 ​​and the third cabinet 33. This facilitates assembly and helps to prevent the first cabinet 31 and the second cabinet 32 ​​from being subjected to large impacts during transportation and use, effectively protecting the first cabinet 31 and the second cabinet 32 ​​and meeting the vibration reduction requirements of the equipment.

[0095] Specifically, the first and second buffer structures can be made of elastic components of rubber or polyurethane sheets, and the second cabinet 32, which houses the transformer unit 10 and is heavier, can be made of more rigid elastic shock-absorbing components.

[0096] Specifically, the second cabinet 32 ​​and the third cabinet 33 are enclosed structures to effectively protect the transformer unit 10 and the power unit 20.

[0097] Specifically, at least one of the first cabinet 31, the second cabinet 32, and the third cabinet 33 is equipped with a vibration damping buffer on the supporting base. This facilitates effective vibration damping of the first cabinet 31, the second cabinet 32, and the third cabinet 33, preventing them from being subjected to significant impacts during use or transportation, thus meeting the vibration reduction requirements of the equipment.

[0098] Specifically, the damping buffer can be a damping spring.

[0099] In this embodiment, the power unit 20 includes a rectifier module 22 and an inverter module 23.

[0100] Specifically, both the rectifier module 22 and the inverter module 23 include heat sinks with heat dissipation channels. The inverter skid also includes a heat sink 70, which is connected to the heat dissipation channels and is separated from the power unit 20 into different chambers. This structural design facilitates the separation of the heat sink 70 from the power unit 20, preventing heat dissipation fluid leakage from the heat sink 70 to the power unit 20 and effectively protecting the power unit 20. Specifically, the heat sink 70 and the power unit 20 are separated into different chambers by a partition plate 80. The power unit 20 is located on one side of the partition plate 80, and the heat sink 70 passes through the partition plate 80. A portion of the heat sink 70 is located on one side of the partition plate 80 and is connected to the heat sink, while the other portion of the heat sink 70 and the heat dissipation fluid drive pump are located on the other side of the partition plate 80, allowing for effective separation.

[0101] Specifically, the power unit 20 also includes a frame structure 21, multiple capacitors 24, a first connecting busbar 25, and a second connecting busbar 26. The rectifier module 22, inverter module 23, and multiple capacitors 24 are all installed in the mounting slots of the frame structure 21. The first connecting busbar 25 is used to connect to a portion of the rectifier module 22 and multiple capacitors 24; the second connecting busbar 26 is used to connect to another portion of the inverter module 23 and multiple capacitors 24. This modular assembly of modules and frame structure 21 facilitates the formation of an integrated modular structure, making maintenance and management easier and facilitating assembly operations.

[0102] Specifically, in this embodiment, the transformer unit 10 functions to step down the main power supply to achieve the voltage level of the power unit 20. The transformer unit 10 mainly comprises a transformer winding, a winding temperature sensor, a cooling fan 40, and an air duct. The transformer unit 10 is installed inside the second cabinet 32 ​​and fixed to the support base at the bottom of the cabinet 30 by a shock-absorbing unit. An air inlet and an air outlet are installed on the second cabinet 32. The air inlet uses a filter to filter water vapor and dust, and the air outlet uses a fan 40 to exhaust hot air from the cabinet to the outside, thus cooling the transformer unit 10 inside the second cabinet 32. The air inlet uses natural air intake or an additional fan 40 to ensure sufficient airflow, and the air outlet uses an exhaust fan 40 with self-closing louvers to exhaust internal hot air. The self-closing louvers ensure isolation between the inside and outside of the cabinet when the exhaust fan 40 is not working, preventing moisture, dust, and other debris from entering the transformer compartment. The air inlet and outlet are equipped with retractable dustproof covers, which can be pulled down for dust protection during transportation and opened for air intake and exhaust during operation. The transformer unit 10 also contains dehumidifiers and heaters to prevent condensation and heat generation within the compartment. To prevent losses in the event of a fire, the equipment is equipped with a smoke alarm that will sound an alarm upon detection of smoke.

[0103] Specifically, another form of transformer unit 10 is a high-protection-level transformer that meets the protection requirements of the working environment without the need for a dedicated enclosure. The transformer type is not limited to oil-immersed transformers, fully enclosed transformers, or any other transformer type that meets external waterproof and dustproof requirements. The heat dissipation method for the high-protection transformer is not limited to forced air cooling, air finned cooling, or oil pump circulation cooling. Similarly, the transformer is connected and fixed to the enclosure via vibration-damping components.

[0104] Specifically, the heat dissipation of the transformer unit 10 can take various forms, including forced air cooling, closed-loop air-water cooling, and air conditioning. Forced air cooling dissipates heat by exhausting air from the chamber using inlet and outlet fans 40, or solely by the exhaust fan 40. Closed-loop air-water cooling places the transformer in a sealed chamber without air inlets or outlets, completely isolating it from the external environment and effectively preventing the impact of moisture and dust on the equipment. An air-water heat exchanger is installed inside the second cabinet 32. The cooled liquid in the heat exchanger exchanges heat with the air inside the chamber to reduce the heat inside the cabinet. Air conditioning also involves installing the transformer unit 10 inside the enclosed second cabinet 32, using a high-power air conditioner to lower the temperature of the hot air inside the cabinet, ensuring the transformer temperature remains within a safe range.

[0105] In this embodiment, the transformer unit 10 includes a main winding and an auxiliary winding. The main winding has a main output section, and the auxiliary winding has an auxiliary output terminal. The power transmitted from the main winding is used to power the subsequent rectifier unit. The power transmitted from the auxiliary winding is used to power the auxiliary system of the frequency converter and external equipment. The auxiliary equipment includes the fan 40 used by the transformer, the water pump used by the cooling system, and other auxiliary equipment.

[0106] Specifically, the power unit 20 converts the AC power from the transformer unit 10 into DC power. The power unit 20 can be divided into a rectifier unit, an inverter unit, and a capacitor 24. The rectifier unit converts AC power into DC power; the inverter unit converts the aforementioned DC power into AC power with controllable voltage and frequency; and the capacitor 24 buffers energy. The power unit 20 is installed in a closed third cabinet 33 to avoid the effects of dust and moisture. An air conditioner and heater are also installed inside the cabinet to ensure that the temperature and humidity inside the cabinet are within a suitable range. A smoke detector is installed in the third cabinet 33 to trigger an alarm when smoke is detected. Each power unit 20 consists of power components for switching circuits, a water-cooled plate for cooling the power unit 20, and stacked busbars connecting the power units 20. The power unit 20 uses a double-sided placement of components (including IGBTs, diodes, power resistors, etc.) to reduce space usage.

[0107] Specifically, the power unit 20 is assembled using a frame structure, with all power units 20 and capacitors 24 assembled together using a frame made of metal or insulating material. The upper part of the frame houses the power unit 20 components, including the rectifier and inverter units. The bottom of the frame houses the capacitors 24. All electrical connections between the power units 20 and capacitors 24 are achieved using a front-mounted stacked busbar. The rear of the power unit 20 is equipped with inlet and outlet water pipe connectors for heat dissipation. These connectors are designed for quick plugging and unplugging, ensuring that liquid does not leak and cause contamination during maintenance, while also improving replacement efficiency.

[0108] The integrated structure of the variable frequency skid provided in this embodiment facilitates installation, maintenance, and relocation. It can be easily installed on mobile transport vehicles and offers advantages such as compact structure, high protection, and ease of transport. The variable frequency skid converts AC power into AC power with controllable frequency and voltage to drive the motor, thereby adjusting the motor speed.

[0109] As shown in Figures 7 to 10, another embodiment of this application provides a power unit including an inverter module 23, a rectifier module 22, a first capacitor module 241, a second capacitor module 242, a second connecting busbar 26, and a first connecting busbar 25. The inverter module 23 and the first capacitor module 241 are arranged side by side, and the rectifier module 22 and the second capacitor module 242 are arranged side by side. A portion of the second connecting busbar 26 is connected to the inverter module 23, and another portion of the second connecting busbar 26 is connected to the first capacitor module 241. A portion of the first connecting busbar 25 is connected to the rectifier module 22, and another portion of the first connecting busbar 25 is connected to the second capacitor module 242.

[0110] The modular design of the power unit provided in this embodiment allows for rapid connection of the inverter module 23 to the first capacitor module 241 and the rectifier module 22 to the second capacitor module 242 via the connection of the second connecting busbar 26 and the first connecting busbar 25. This enables rapid connection of the entire power unit without requiring individual assembly of multiple components of each module, thus reducing the assembly difficulty and complexity of the power unit. Furthermore, the modular design facilitates maintenance and upgrades, making disassembly and assembly operations easier for staff. In addition, the side-by-side arrangement facilitates connection via busbars, optimizing the compactness of the power unit's internal structure and simplifying the connection between the second connecting busbar 26 and the first connecting busbar 25.

[0111] Specifically, the first power component 233 and the second power component 223 may include devices such as IGBTs, diodes, capacitors, and circuit boards. The function of the first power component 233 and the second power component 223 is to switch on and off under the control of the control system, so as to realize the conduction and shutdown of current on the device and achieve the purpose of controlling the output voltage and current.

[0112] In this embodiment, the inverter module 23 includes a first housing 231, a first connecting bus 232, and a first power component 233. The first housing 231 has a first opening 2311. The first power component 233 is installed inside the first housing 231. The first connecting bus 232 is connected to the first power component 233. A first connecting portion 2321 of the first connecting bus 232 is located at the first opening 2311. At least a portion of the second connecting bus 26 is located at the first opening 2311 and connected to the first connecting portion 2321. This structural arrangement facilitates the formation of an independent inverter module 23 and also facilitates the implementation of a stacked bus connection between the first connecting bus and the second connecting bus 26 of the inverter module 23, simplifying connection and assembly operations.

[0113] Specifically, the inverter module 23 also includes a first heat sink, which is disposed within the first housing 231. The first power component 233 is mounted on the first heat sink for heat dissipation. Specifically, the first heat sink can be a cooling plate, into which coolant is circulated for cooling. The structural design of the inverter module 23 not only ensures the tightness and reliability of the internal connections but also facilitates heat dissipation, making it suitable for high-power, high-load inverters.

[0114] By providing a first opening 2311 on the first housing 231, the second connecting busbar 26 is allowed to be directly connected to the first connecting part. This design not only simplifies the internal wiring but also improves the heat dissipation efficiency, ensuring the stability and lifespan of the module under high-power operating conditions.

[0115] In this embodiment, the rectifier module 22 includes a second housing 221, a second connecting bus 222, and a second power component 223. The second housing 221 has a second opening 2211. The second power component 223 is installed inside the second housing 221. The second connecting bus 222 is connected to the second power component 223. A second connecting portion 2221 of the second connecting bus 222 is located at the second opening 2211. At least a portion of the first connecting bus 25 is located at the second opening 2211 and connected to the second connecting portion 2221. This structural arrangement facilitates the formation of an independent rectifier module 22 and also facilitates the implementation of a stacked bus connection between the second connecting bus 222 and the first connecting bus 25 of the rectifier module 22, simplifying connection and assembly operations.

[0116] Specifically, the rectifier module 22 also includes a first heat sink, which is disposed within the second housing 221. The second power component 223 is mounted on the second heat sink for heat dissipation. Specifically, the second heat sink can be a cooling plate, into which coolant is circulated for cooling. The structural design of the rectifier module 22 not only ensures the tightness and reliability of the internal connections but also facilitates heat dissipation, making it suitable for high-power, high-load frequency converters.

[0117] By providing a second opening 2211 on the second housing 221, the first connecting busbar 25 is allowed to be directly connected to the second connecting part 2221. This design not only simplifies the internal wiring but also improves the heat dissipation efficiency, ensuring the stability and lifespan of the module under high-power operating conditions.

[0118] In this embodiment, the power unit further includes an intermediate connecting busbar 27, one end of which is connected to the second connecting busbar 26, and the other end of which is connected to the first connecting busbar 25. This structural arrangement facilitates the connection between the second connecting busbar 26 and the first connecting busbar 25, simplifying connection operations. Furthermore, the intermediate connecting busbar 27 simplifies the connection between modules, improving the overall compactness and stability of the structure.

[0119] Specifically, one end of the intermediate connecting busbar 27 is connected to the part of the second connecting busbar 26 corresponding to the first capacitor module 241, and the other end of the intermediate connecting busbar 27 is connected to the part of the first connecting busbar 25 corresponding to the second capacitor module 242. This connection method ensures voltage stability during the power conversion process, improves the stability and safety of the system, and is suitable for applications requiring stable voltage output, such as fracturing equipment.

[0120] In this embodiment, there are multiple inverter modules 23, which are arranged at intervals in a first preset direction. There are also multiple first capacitor modules 241, also arranged at intervals in the first preset direction. The first capacitor modules 241 and the multiple inverter modules 23 are spaced apart along a second preset direction, and are arranged in a one-to-one correspondence. A portion of the second connecting busbar 26 is connected to the multiple inverter modules 23, and another portion of the second connecting busbar 26 is connected to the multiple first capacitor modules 241. This structural arrangement facilitates optimization of the structural layout of the multiple inverter modules 23 and the multiple first capacitor modules 241, improving the compactness of the power unit's structural layout. It also facilitates the connection of the multiple first capacitor modules 241 and the multiple inverter modules 23 via the second connecting busbar 26. Furthermore, this structural layout also facilitates subsequent maintenance and repair work by the operators.

[0121] Specifically, the second connecting busbar 26 is provided with a clearance notch, which is configured to avoid the inverter output section 234 of the inverter module 23. This structural arrangement facilitates the connection of the inverter output section 234 to the external connection line 29, thereby facilitating the supply of power to external electrical devices and simplifying connection operations.

[0122] In this embodiment, a first clearance hole is provided on the second connecting busbar 26, and the first clearance hole is disposed opposite to the first connecting part of the inverter module 23. This structural arrangement facilitates the connection of the first connecting part of the inverter module 23 to external lines, simplifying operation.

[0123] Specifically, the second connecting busbar 26 is provided with a second clearance hole, which is positioned opposite to the first access portion 2411 of the first capacitor module 241. This structural arrangement facilitates the connection of the first access portion 2411 of the first capacitor module 241 to external lines, simplifying operation.

[0124] Specifically, a third clearance hole is provided on the first connecting busbar 25, which is positioned opposite to the second connecting portion 2221 of the rectifier module 22. This structural arrangement facilitates the connection of the second connecting portion 2221 of the rectifier module 22 to external lines, making operation convenient.

[0125] Specifically, a fourth clearance hole is provided on the first connecting busbar 25, which is positioned opposite to the second access portion 2421 of the second capacitor module 242. This design facilitates the connection of the second access portion 2421 of the second capacitor module 242 to external lines, making operation convenient.

[0126] In this embodiment, the power unit further includes a support frame 28, which includes a support bracket 281 and a first support plate 282 and a second support plate 283 spaced apart on the support bracket 281. The first support plate 282 is positioned above the second support plate 283. The first capacitor module 241 and the second capacitor module 242 are spaced apart on the second support plate 283, while the inverter module 23 and the rectifier module 22 are spaced apart on the first support plate 282. This structural arrangement facilitates optimization of the structural layout of the inverter module 23, the rectifier module 22, the first capacitor module 241, and the second capacitor module 242, enabling the formation of an integrated frame structure and simplifying installation and operation.

[0127] Specifically, the first support plate 282 and / or the second support plate 283 are provided with heat dissipation holes 284 to facilitate heat dissipation for the inverter module 23 or the rectifier module 22.

[0128] Specifically, the inverter module 23, rectifier module 22, first capacitor module 241 and second capacitor module 242 can all be fixedly connected to the support frame 28, thereby improving the structural stability of the overall power unit and facilitating the adjustment and installation of the position of the support frame 28 according to actual needs, thus improving the structural stability and reliability of the equipment.

[0129] Specifically, the inverter module 23, rectifier module 22, first capacitor module 241 and second capacitor module 242 are designed as box-type structures to facilitate their installation on the support frame 28.

[0130] The first capacitor module 241 and the second capacitor module 242 are located below the inverter module 23 and the rectifier module 22, respectively. This arrangement facilitates the connection between the second connecting busbar 26 and the first connecting busbar 25, making installation easier.

[0131] Furthermore, the support frame 28 enhances the structural stability and heat dissipation performance of the system. The design of the support frame 28 not only provides a robust support structure but also promotes system heat dissipation. Good heat dissipation performance prevents overheating of the equipment. Simultaneously, the enhanced structural stability and heat dissipation performance of the support frame 28 ensure the long-term stable operation of the power unit, improving equipment reliability and production efficiency.

[0132] In this embodiment, the power unit further includes a connecting line 29 and a line support 210. The connecting line 29 is connected to the inverter output 234 of the inverter module 23. The line support 210 has a support hole adapted to the connecting line 29, through which the connecting line 29 passes. This structural arrangement ensures the safety and reliability of the transmission of the connecting line. The stability of the connecting line 29 and the protective function of the line support 210 effectively avoid risks such as line damage and power outages, ensuring the normal operation of the power unit. At the same time, the design of the support hole of the line support 210 can also adapt to connecting lines 29 of different shapes and sizes, improving the design flexibility and compatibility of the system.

[0133] Specifically, the power unit also includes a wiring fastener 2110, which has wiring holes to facilitate fixing the wiring of the power unit.

[0134] This application also provides a frequency converter that includes the power unit described above. This structural arrangement facilitates the implementation of a skid-mounted frequency converter structure, optimizes the internal structural layout of the frequency converter, and improves the compactness of the frequency converter's structural layout.

[0135] As shown in Figures 11 to 19, another embodiment of this application provides a functional module, which is a rectifier module or an inverter module. The functional module includes: a heat sink 910, a side plate assembly 920, multiple power devices 930, and a busbar 940. The heat sink 910 has a first fixing surface and a second fixing surface that are disposed opposite to each other. The side plate assembly 920 is disposed around the periphery of the heat sink 910, and its two ends protrude from the first fixing surface and the second fixing surface, respectively, to form a first mounting cavity and a second mounting cavity. The multiple power devices 930 are respectively disposed in the first mounting cavity and the second mounting cavity. The busbar 940 is connected to the multiple power devices 930, and the connecting part of the busbar 940 extends out of the side plate assembly 920.

[0136] The functional modules provided in this embodiment facilitate optimization of their structural layout, improve their compactness, and reduce their volume. By mounting multiple power devices 930 on both sides of the heat sink 910, it is easy for one heat sink 910 to contact multiple power devices 930 simultaneously, ensuring effective heat dissipation and further optimizing the structural layout. Furthermore, the modular layout of the power devices 930 facilitates rapid assembly and installation in the field, improving installation convenience.

[0137] In this embodiment, a wire harness fixing member 9100 is provided on the first fixing surface and / or the second fixing surface. This structural arrangement facilitates the fixing of the wire harness on the first fixing surface and / or the second fixing surface using the wire harness fixing member 9100, making it easier to organize and manage the wire harness, as well as facilitating the connection of the wire harness and ensuring the stability of the wire harness connection.

[0138] Specifically, the side panel assembly 920 is provided with at least one clearance opening 923, which is positioned opposite to the connection portion of the busbar 940. The connection portion of the busbar 940 passes through the clearance opening 923 and extends out of the side panel assembly 920 through the clearance opening 923. This structural arrangement facilitates connection to other external components via the connection portion of the busbar 940 and also simplifies wiring and other connection operations during assembly.

[0139] In this embodiment, at least a portion of the connecting part of the busbar 940 abuts against the periphery of the clearance opening 923. This facilitates improved positioning stability of the connecting part of the busbar 940, preventing unstable installation or easy shaking of the connecting part of the busbar 940, and thus ensuring the connection stability of the connecting part of the busbar 940 with external components.

[0140] As shown in Figures 11 to 15, the functional module is a rectifier module. The functional module also includes a limiting part 950, which is connected to the side plate assembly 920. The limiting end of the limiting part 950 is installed on at least a portion of the clearance opening 923, forming a limiting space adapted to the connecting part. The limiting end of the limiting part 950 and at least a portion of the clearance opening 923 are respectively used to abut and limit the connection of the busbar 940 to both sides. This structural arrangement, by abutting and positioning both sides of the busbar 940, further improves the stability of the connection position of the busbar 940, better preventing the connection from shaking during connection, and thus better ensuring the connection stability of the busbar 940 when connected to external components.

[0141] Specifically, the functional module is a rectifier module. The side panel assembly 920 includes a first side panel 921 and a second side panel 922 connected at a preset angle. The busbar 940 connection includes an inlet busbar 941 and an outlet busbar 942. The clearance opening 923 includes a first clearance opening 9231 and a second clearance opening 9232. The first side panel 921 has a first clearance opening 9231, through which the inlet busbar 941 passes and extends outside the side panel assembly 920. The second side panel 922 has a second clearance opening 9232, through which the outlet busbar 942 passes and extends outside the side panel assembly 920. This structural arrangement allows the inlet busbar 941 and the outlet busbar 942 to be located at different parts of the side panel assembly 920, facilitating the separation of the inlet and outlet connections and preventing interference between the inlet busbar 941 and the outlet busbar 942.

[0142] Specifically, the functional module is a rectifier module. There are at least two first clearance ports 9231, spaced apart along the extension direction of the first side plate 921. The connecting portion of the busbar 940 includes at least two inlet ports 941, each corresponding to one of the at least two first clearance ports 9231, with each inlet port 941 passing through its corresponding first clearance port 9231. The rectifier module also includes a limiting portion 950, extending along the extension direction of the first side plate 921. The limiting end of the limiting portion 950 is installed at the at least two first clearance ports 9231 and forms at least two limiting spaces adapted to the at least two inlet ports 941. The limiting end of the limiting portion 950 and at least a portion of the periphery of the at least two first clearance ports 9231 respectively abut and limit the movement of the inlet ports 941. With this structural arrangement, a limiting part 950 can cooperate with at least two first clearance ports 9231 to position the inlet outlet 941 in each first clearance port 9231, ensuring the positioning stability of the inlet outlet 941 in each first clearance port 9231, and thus ensuring the stability of the connection state when each inlet outlet 941 is connected to external components.

[0143] Specifically, imports are ranked 941st with three entries, and exports are ranked 942nd with two entries.

[0144] Specifically, the functional module is a rectifier module. The limiting part 950 includes a first limiting plate 951 and a second limiting plate 952 connected to each other at a first predetermined angle. The first limiting plate 951 is connected to the first side plate 921, and one side of the second limiting plate 952 forms the limiting end of the limiting part 950. The inlet drain 941 includes a first connecting plate 9411 and a second connecting plate 9412 connected at a second predetermined angle. The first connecting plate 9411 passes through the first clearance opening 9231, and the second connecting plate 9412 is located outside the side plate assembly 920 and opposite to the first side plate 921. Both sides of the first connecting plate 9411 abut against at least a portion of one side of the second limiting plate 952 and the periphery of the first clearance opening 9231, respectively. This structural arrangement is simple and facilitates better simultaneous abutment and positioning of at least two inlet drains 941 through the limiting part 950, resulting in good positioning stability.

[0145] Specifically, the functional module is a rectifier module. The connection portion of the busbar 940 includes at least two outlet outlets 942, which are spaced apart along the extension direction of the second side plate 922. Each outlet outlet 942 is installed within a second clearance opening 9232 and at least partially abuts against the periphery of the second clearance opening 9232. This structural arrangement facilitates improved positioning stability of the outlet outlets 942 and ensures stable connection when connecting them to external components.

[0146] Specifically, the functional module is a rectifier module. A portion of multiple power devices 930 is housed in a first mounting cavity, and another portion of the multiple power devices 930 is housed in a second mounting cavity. The portions of the multiple power devices 930 and the other portion are independently configured. There are two busbars 940: one busbar 940 is housed in the first mounting cavity and connected to a portion of the multiple power devices 930, and the other busbar 940 is housed in the second mounting cavity and connected to the other portion of the multiple power devices 930. The connection portions of the two busbars 940 are spaced apart. This structural arrangement allows the multiple power devices 930 to form two independent rectifier submodules that are not electrically connected separately. These two rectifier submodules can operate independently, or they can be electrically connected via other connection components 980, thus achieving different connection methods and improving connection flexibility.

[0147] Specifically, the heat sink 910 is a cooling plate with a heat exchange channel inside; the functional module is an inverter module, and a power supply mounting plate is also provided on the portion of the first fixed surface near the heat exchange channel and / or on the portion of the second fixed surface near the heat exchange channel, with the drive power supply detachably mounted on the power supply mounting plate. This structural arrangement facilitates effective heat dissipation from the power supply mounting plate of the inverter module, improving the heat dissipation effect and thus ensuring the effective operation of the inverter module.

[0148] As shown in Figures 16 to 19, the functional module is an inverter module. The busbar 940 includes a first connecting busbar 943 and a second connecting busbar 944 that are interconnected. The first connecting busbar 943 is connected to the portion of the multiple power devices 930 located in the first mounting cavity, and the second connecting busbar 944 is connected to the portion of the multiple power devices 930 located in the second mounting cavity. The first connecting portion 9431 of the first connecting busbar 943 and the second connecting portion 9441 of the second connecting busbar 944 both extend outside the side plate assembly 920. This structural arrangement facilitates the connection layout of the busbar 940, improves the compactness of the structural layout of the busbar 940 and the reliability of the connection, ensures the connection stability of the overall inverter module, and thus facilitates the guarantee of the operational stability of the inverter module.

[0149] Specifically, the functional module is an inverter module. The first connection bar 943 includes a first plate 9432, a second plate 9433, and a third plate 9434 connected in sequence. The first plate 9432 is disposed within a first mounting cavity and connected to the portion of the multiple power devices 930 located within the first mounting cavity. The second plate 9433 has a first connecting portion 9431, and the third plate 9434 is located within a second mounting cavity. The second connection bar 944 includes a fourth plate 9442 and a fifth plate 9443 connected in sequence. The fourth plate 9442 is disposed within the second mounting cavity and connected to the portion of the multiple power devices 930 located within the second mounting cavity. The fifth plate 9443 has a second connecting portion 9441. The third plate 9434 is connected to the fourth plate 9442. This arrangement facilitates the connection between the first connection bar 943 and the second connection bar 944, optimizes the structural layout, and improves connection stability.

[0150] Specifically, the third plate 9434 and the fourth plate 9442 are arranged parallel to each other, and the third plate 9434 and the fourth plate 9442 are attached together and locked together by a locking member. Specifically, the locking member can be a locking screw.

[0151] Specifically, at least a portion of the fifth plate 9443 and the second plate 9433 are arranged opposite each other, and the first connecting portion 9431 and the second connecting portion 9441 are spaced apart. This structural arrangement facilitates optimized structural layout, improves structural compactness, and allows for easy connection of the first connecting portion 9431 and the second connecting portion 9441 to external components. Specifically, there can be two first connecting portions 9431 and one second connecting portion 9441. The two first connecting portions 9431 can have different structures to achieve different connection functions.

[0152] In this embodiment, the functional module further includes a first mounting cover 961, which is disposed on one side of the side plate assembly 920 to seal the first mounting cavity. This structural arrangement facilitates better protection of the power device 930 within the first mounting cavity.

[0153] In this embodiment, the functional module further includes a second mounting cover 962, which is disposed on the other side of the side plate assembly 920 to seal the second mounting cavity. This facilitates better protection of the power device 930 inside the second mounting cavity.

[0154] Specifically, the heat sink 910 is a cooling plate, which has a good water cooling effect and facilitates effective heat dissipation. Specifically, the cooling plate has liquid channels arranged inside. After the coolant flows into the cooling plate through the liquid channels, it carries away the heat of the power device 930 mounted on the cooling plate, thereby achieving the purpose of cooling the power device 930.

[0155] In this embodiment, a first positioning groove 911 is provided on one side of the heat sink 910. The shape of the first positioning groove 911 is adapted to the shape of its corresponding power device 930, so as to facilitate the positioning of the power device 930 in the first mounting cavity and improve the installation stability of the power device 930 in the first mounting cavity.

[0156] In this embodiment, a second positioning groove 912 is provided on the other side of the heat sink 910. The shape of the second positioning groove 912 is adapted to the shape of its corresponding power device 930, so as to facilitate the positioning of the power device 930 in the second mounting cavity and improve the installation stability of the power device 930 in the second mounting cavity.

[0157] Specifically, the functional module also includes an interface board 970, which is mounted outside the side plate assembly 920. The interface board 970 has a liquid inlet port 971 and a liquid outlet port 972, both of which are connected to the heat exchange channel of the heat sink 910. This structural arrangement facilitates liquid inlet and outlet operations into the heat sink 910 via the interface board 970, improving the heat dissipation effect of the heat sink 910. Furthermore, by placing the interface board 970 outside the side plate assembly 920, leakage from the interface board 970 can be prevented from affecting the normal operation of the power device 930. Specifically, the connection portions of the interface board 970 and the busbar 940 are spaced apart and located on different sides of the side plate assembly 920, which further helps to prevent leakage from the interface board 970 from affecting the connection portion of the busbar 940.

[0158] Specifically, the functional module also includes a connection component 980, which is disposed on the side panel assembly 920. The connection component 980 includes an optical path connection connector 981 and / or a circuit connection connector 982 located outside the side panel assembly 920. This facilitates connection with external components via the connection component 980. Specifically, the optical path connection connector 981 mainly refers to the signal used to control the switching of the high-voltage power device 930. This signal is transmitted through optical fiber to prevent signal interference in strong electromagnetic environments. The circuit connection connector 982 is used to supply power to the driving component and the temperature signal from the temperature sensing element mounted on the heat sink 910.

[0159] According to this application, a frequency converter is also provided, which includes the functional modules provided above.

[0160] In this embodiment, for ease of operation, an operating handle 990 may be provided on the side panel assembly 920 or the connecting component 980.

[0161] Specifically, in this embodiment, the busbar 940 is mounted on the power device 930 via a fastening component, which can be a bolt, and the power device 930 has corresponding threads. The power device 930 includes devices such as IGBTs, diodes, and capacitors. The function of the power device 930 is to switch on and off under the control of the control system, thereby controlling the output voltage and current by turning the current on and off.

[0162] As can be seen from the above description, the embodiments of this application achieve the following technical effects: The frequency converter skid, by integrating a transformer unit, a power unit, and various electrical devices, combined with a high-efficiency heat dissipation system, environmental control and safety monitoring equipment, and a modular, detachable enclosure structure, not only improves the integration and operating efficiency of the equipment but also enhances its stability and safety. It is suitable for fracturing equipment applications and can provide a stable, efficient, and safe power conversion and control solution. The modular structure of the power unit facilitates connection and installation, simplifies installation operations, and facilitates maintenance and replacement. The use of independent functional modules improves the overall structural compactness, reduces the overall volume occupied, enables rapid on-site installation, reduces cluttered wiring, and further enhances the overall structural compactness of the frequency converter. Furthermore, the use of external optical connection connectors, circuit connection connectors, and interface boards effectively avoids leakage problems during on-site maintenance, facilitates connection with external components, and speeds up maintenance.

[0163] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0164] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0165] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0166] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0167] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0168] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

A functional module, characterized in that The functional module is a rectifier module or an inverter module; the functional module comprises: A heat dissipation member (910) having oppositely arranged first and second fixing surfaces; A side plate assembly (920) arranged around the periphery of the heat dissipation member (910), both ends of the side plate assembly (920) protruding from the first and second fixing surfaces to form first and second installation cavities, respectively; A plurality of power devices (930) arranged in the first and second installation cavities, respectively; A busbar (940) connected to the plurality of power devices, the connecting portion of the busbar (940) protruding out of the side plate assembly (920). The functional module according to claim 1, characterized in that The first and / or second fixing surfaces are provided with a wire harness fixing member (9100). The functional module according to claim 1, characterized in that The side plate assembly (920) is provided with at least one avoiding opening portion (923) arranged opposite to the connecting portion of the busbar (940), the connecting portion of the busbar (940) passing through the avoiding opening portion (923) and protruding out of the side plate assembly (920) through the avoiding opening portion (923). The functional module according to claim 3, characterized in that At least part of the connecting portion of the busbar (940) abuts against the periphery of the avoiding opening portion (923). The functional module according to claim 3, characterized in that The functional module is a rectifier module, and the functional module further comprises: A limiting portion (950) connected to the side plate assembly (920), the limiting end of the limiting portion (950) being installed at least partially in the avoiding opening portion (923) and forming a limiting space with the avoiding opening portion (923) to accommodate the connecting portion of the busbar (940), the limiting end of the limiting portion (950) and the avoiding opening portion (923) being used to abut against both sides of the connecting portion of the busbar (940), respectively. The functional module according to claim 5, characterized in that The side plate assembly (920) comprises a first side plate (921) and a second side plate (922) connected at a preset angle, the connecting portion of the busbar (940) comprises an inlet busbar (941) and an outlet busbar (942), and the avoiding opening portion (923) comprises a first avoiding opening (9231) and a second avoiding opening (9232); The first side plate (921) is provided with the first avoiding opening (9231), and the inlet busbar (941) passes through the first avoiding opening (9231) and protrudes out of the side plate assembly (920); The second side plate (922) is provided with the second avoiding opening (9232), and the outlet busbar (942) passes through the second avoiding opening (9232) and protrudes out of the side plate assembly (920). The functional module according to claim 1, characterized in that The functional module is a rectifier module, part of the plurality of power devices (930) is arranged in the first installation cavity, another part of the plurality of power devices (930) is arranged in the second installation cavity, and part of the plurality of power devices (930) is arranged independently from another part of the plurality of power devices (930). The two busbars (940) are arranged in the first mounting cavity and connected with one part of the plurality of power devices (930), and the other busbar (940) is arranged in the second mounting cavity and connected with another part of the plurality of power devices (930), and the connecting part of one busbar (940) and the connecting part of the other busbar (940) are arranged at intervals. The functional module according to claim 1, characterized in that The heat dissipation member is a cooling plate, and the cooling plate is provided with a heat exchange channel; the functional module is an inverter module, and the part of the first fixing surface close to the heat exchange channel and / or the part of the second fixing surface close to the heat exchange channel is further provided with a power supply mounting plate, and the driving power supply is detachably arranged on the power supply mounting plate. The functional module according to claim 1, characterized in that The functional module is an inverter module, the busbar (940) includes a first connecting row (943) and a second connecting row (944) connected with each other, the first connecting row (943) is connected with the part of the plurality of power devices (930) located in the first mounting cavity, the second connecting row (944) is connected with the part of the plurality of power devices (930) located in the second mounting cavity, and the first connecting part (9431) of the first connecting row (943) and the second connecting part (9441) of the second connecting row (944) are arranged outside the side plate assembly (920). The functional module according to claim 9, characterized in that The first connecting row (943) includes a first plate body (9432), a second plate body (9433) and a third plate body (9434) connected in sequence, the first plate body (9432) is arranged in the first mounting cavity and connected with the part of the plurality of power devices (930) located in the first mounting cavity, the first connecting part (9431) is arranged on the second plate body (9433), and the third plate body (9434) is located in the second mounting cavity; the second connecting row (944) includes a fourth plate body (9442) and a fifth plate body (9443) connected in sequence, the fourth plate body (9442) is arranged in the second mounting cavity and connected with the part of the plurality of power devices (930) located in the second mounting cavity, and the second connecting part (9441) is arranged on the fifth plate body (9443); The third plate body (9434) is arranged in connection with the fourth plate body (9442); and / or, The fifth plate body (9443) is arranged opposite to at least part of the second plate body (9433), and the first connecting part (9431) and the second connecting part (9441) are arranged at intervals. The functional module according to any one of claims 1 to 10, characterized in that The functional module further includes: A first mounting cover (961) arranged on one side of the side plate assembly (920) to seal the first mounting cavity; and / or, A second mounting cover (962) arranged on the other side of the side plate assembly (920) to seal the second mounting cavity. The functional module according to any one of claims 1 to 10, wherein The heat dissipation piece (910) is provided with a first positioning groove (911) on one side, and the first positioning groove (911) is matched with the shape of the corresponding power device (930); and / or, The other side of the heat dissipation piece (910) is provided with a second positioning groove (912), and the second positioning groove (912) is matched with the shape of the corresponding power device (930). The functional module according to any one of claims 1 to 10, characterized in that The functional module further comprises: An interface plate (970) is installed outside the side plate assembly (920), and the interface plate (970) is provided with a liquid inlet interface (971) and a liquid outlet interface (972), both of which are in communication with the heat exchange channel of the heat dissipation piece (910); and / or, A connecting component (980) is arranged on the side plate assembly (920), and the connecting component (980) comprises an optical path connecting joint (981) and / or a circuit connecting joint (982) outside the side plate assembly (920). A frequency converter, characterized in that The frequency converter comprises the functional module according to any one of claims 1 to 13. A power unit characterized by Comprise: An inverter module (23), a rectifier module (22), a first capacitor module (241) and a second capacitor module (242), the inverter module (23) and the first capacitor module (241) are arranged side by side, and the rectifier module (22) and the second capacitor module (242) are arranged side by side; A second connecting bus bar (26), one part of the second connecting bus bar (26) is connected with the inverter module (23), and the other part of the second connecting bus bar (26) is connected with the first capacitor module (241); A first connecting bus bar (25), one part of the first connecting bus bar (25) is connected with the rectifier module (22), and the other part of the first connecting bus bar (25) is connected with the second capacitor module (242). The power unit according to claim 15, characterized in that The inverter module (23) comprises a first shell (231), a first connecting row (232) and a first power component (233), the first shell (231) is provided with a first opening (2311), the first power component (233) is installed in the first shell (231), the first connecting row (232) is connected with the first power component (233), the first connecting part (2321) of the first connecting row (232) is arranged at the first opening (2311), and at least part of the second connecting bus bar (26) is arranged at the first opening (2311) and connected with the first connecting part (2321). The power unit according to claim 15, characterized in that The rectifier module (22) comprises a second shell (221), a second connecting row (222) and a second power component (223), the second shell (221) is provided with a second opening (2211), the second power component (223) is installed in the second shell (221), the second connecting row (222) is connected with the second power component (223), and the second connecting part (2221) of the second connecting row (222) is arranged at the second opening (2211). At least part of the first connecting busbar (25) is arranged at the second opening (2211) and connected with the second connecting part (2221). The power unit according to claim 15, characterized in that The inverter module (23), the rectifier module (22), the first capacitor module (241) and the second capacitor module (242) are all box structures. The first capacitor module (241) and the second capacitor module (242) are located below the inverter module (23) and the rectifier module (22) respectively. The power unit according to claim 15, characterized in that The inverter module (23) is a plurality of inverter modules (23) arranged in a first preset direction at intervals, the first capacitor module (241) is a plurality of first capacitor modules (241) arranged in the first preset direction at intervals, the plurality of first capacitor modules (241) and the plurality of inverter modules (23) are arranged at intervals along a second preset direction, the plurality of first capacitor modules (241) and the plurality of inverter modules (23) are arranged one by one, part of the second connecting busbar (26) is connected with the plurality of inverter modules (23), and another part of the second connecting busbar (26) is connected with the plurality of first capacitor modules (241). The power unit according to claim 15, characterized in that The second connecting busbar (26) is provided with a avoiding gap, the avoiding gap is arranged to avoid the inverter outlet part (234) of the inverter module (23); and / or, The second connecting busbar (26) is provided with a first avoiding hole, the first avoiding hole is arranged opposite to the first connecting part (2321) of the inverter module (23); and / or, The second connecting busbar (26) is provided with a second avoiding hole, the second avoiding hole is arranged opposite to the first access part (2411) of the first capacitor module (241). The power unit according to claim 15, characterized in that The first connecting busbar (25) is provided with a third avoiding hole, the third avoiding hole is arranged opposite to the second connecting part (2221) of the rectifier module (22); and / or, The first connecting busbar (25) is provided with a fourth avoiding hole, the fourth avoiding hole is arranged opposite to the second access part (2421) of the second capacitor module (242). The power unit according to claim 15, characterized in that The power unit further comprises: A support frame (28) comprising a support frame (281), a first support plate (282) and a second support plate (283) arranged at intervals on the support frame (281), and the first support plate (282) is arranged above the second support plate (283). The first capacitor module (241) and the second capacitor module (242) are arranged on the second support plate (283) in a spaced manner, and the inverter module (23) and the rectifier module (22) are arranged on the first support plate (282) in a spaced manner; and / or, The first support plate (282) and / or the second support plate (283) are provided with heat dissipation through holes (284). The power unit according to claim 15, characterized in that The power unit further comprises: A connecting line (29) connected with an inverter outlet of the inverter module (23); A line support (210) having a support hole matched with the connecting line (29), and the connecting line (29) is arranged in the support hole. The power unit according to claim 15, characterized in that At least one of the inverter module (23) and the rectifier module (22) is a functional module, and the functional module is the functional module as claimed in any one of claims 1 to 13. A frequency converter, characterized by The power unit as claimed in any one of claims 15 to 24. A variable frequency sled characterized by It comprises: A transformer unit (10), an input end of the transformer unit (10) is selectively connected or disconnected with an external power supply, the transformer unit (10) is used to reduce the voltage of the external power supply, the transformer unit (10) has a main output end and an auxiliary output end; A power unit (20), an input end of the power unit (20) is connected with the main output end of the transformer unit (10), the power unit (20) is used to convert alternating current output by the main output end into alternating current with a preset voltage and a preset frequency; A power-consuming device, a power supply port of the power-consuming device is connected with the auxiliary output end. The variable frequency sled of claim 26, wherein The transformer unit (10) comprises a main transformer and an auxiliary transformer, the main transformer has the main output end, and the auxiliary transformer has the auxiliary output end; The power-consuming device comprises at least one of a fan, a cooling liquid driving pump, an air conditioner and a control system, a power supply port of the fan and / or a power supply port of the cooling liquid driving pump is connected with the main output end or the auxiliary output end, and the air conditioner and the control system are connected with the auxiliary output end. The variable frequency sled of claim 26, wherein The frequency conversion skid further comprises: A box body (30), the transformer unit (10) is arranged in the box body (30), and the box body (30) has a spaced air inlet and an air outlet; The power-consuming device comprises a fan (40), a power supply port of the fan (40) is connected with the auxiliary output end, and the fan (40) is arranged at the air inlet or the air outlet. The variable frequency sled of claim 28, wherein The frequency conversion skid further comprises: A filter, the filter is arranged at the air inlet and is used to filter air passing through the air inlet; and / or, A dustproof member, the dustproof member is arranged at the air inlet and / or the air outlet, and the dustproof member is movably arranged to move to an open position avoiding the air inlet and / or the air outlet and a closed position shielding the air inlet and / or the air outlet. The variable frequency sled of claim 26, wherein The frequency conversion skid further comprises a box body (30), and the transformer unit (10) is arranged in the box body (30). The electric equipment comprises a water-cooled radiator, and at least part of a heat exchange pipeline of the water-cooled radiator is arranged in the box body (30); and / or, The electric equipment comprises an air conditioner, and an indoor unit of the air conditioner is arranged in the box body (30). The variable frequency sled of any one of claims 28-30, wherein The electric equipment further comprises: a temperature detection member arranged in the box body (30); and / or, a dehumidification member arranged in the box body (30); and / or, a heating member arranged in the box body (30); and / or, an alarm member arranged in the box body (30), which gives an alarm when detecting smoke. The variable frequency sled of claim 28, wherein The frequency conversion skid further comprises a line inlet unit (50), an input end of the line inlet unit (50) being selectively connected or disconnected with an external power supply, and an input end of the transformer unit (10) being connected with an output of the line inlet unit (50); the line inlet unit (50) comprises: a pre-charging module for magnetizing and charging a capacitor (24) of the transformer unit (10) and / or the power unit (20). The variable frequency sled of claim 32, wherein The pre-charging module comprises: a charging resistor for limiting current in a loop when the input end of the line inlet unit (50) is connected with the external power supply; a vacuum contactor connected with the charging resistor, which disconnects the loop when the current in the loop is greater than a preset current; a circuit breaker for connecting or disconnecting the loop. The variable frequency sled of claim 26, wherein The frequency conversion skid further comprises a line inlet unit (50) and a box body (30), the box body (30) having a first accommodating cavity, a second accommodating cavity and a third accommodating cavity arranged at intervals, the line inlet unit (50) being arranged in the first accommodating cavity, the transformer unit (10) being arranged in the second accommodating cavity, and the power unit (20) being arranged in the third accommodating cavity; wherein the first accommodating cavity and the third accommodating cavity are respectively located on two sides of the second accommodating cavity; and / or, the second accommodating cavity is provided with a first heat dissipation unit; and / or, the third accommodating cavity is provided with a second heat dissipation unit. The variable frequency sled of claim 26, wherein The power unit (20) comprises a rectification module (22) and an inversion module (23); wherein the rectification module (22) and the inversion module (23) each comprise a heat dissipation member having a heat dissipation channel; the frequency conversion skid further comprises a heat dissipation pipe member (70) in communication with the heat dissipation channel, the heat dissipation pipe member (70) being arranged in a different chamber separately from the power unit (20); and / or, The power unit (20) further comprises a frame structure (21), a plurality of capacitors (24), a first connecting busbar (25) and a second connecting busbar (26), the rectifier module (22), the inverter module (23) and the plurality of capacitors (24) are all mounted in mounting slots of the frame structure (21); the first connecting busbar (25) is used for connecting with the rectifier module (22) and a part of the plurality of capacitors (24); the second connecting busbar (26) is used for connecting with the inverter module (23) and another part of the plurality of capacitors (24). The variable frequency sled of claim 26, wherein The power unit (20) is the power unit (20) as claimed in any one of claims 15 to 24.

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