Frequency conversion sledge

Abstract

The utility model provides a frequency conversion sledge, comprising a transformer unit, the input end of the transformer unit is selectively connected or disconnected with an external power supply, the transformer unit is used for reducing the voltage of the external power supply, and the transformer unit is provided with a main output end and an auxiliary output end; the input end of the power unit is connected with the main output end of the transformer unit, and the power unit is used for converting alternating current output by the main output end into alternating current with preset voltage and preset frequency; and a power supply port of the electric equipment is connected with the auxiliary output end. According to the technical scheme provided by the utility model, the technical problem of inconvenience in operation caused by the fact that an external power supply needs to be used for supplying power to electric equipment of an electric frequency sledge in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to frequency conversion skid structure technical field, specifically, relate to a kind of frequency conversion skid. BACKGROUND

[0002] At present, fracturing equipment generally includes a fracturing device for pumping high-pressure fluid into a well, a sand mixing device for mixing proppant and fracturing fluid and supplying liquid to the fracturing device, and an instrument device for monitoring the entire equipment group. In the traditional mode, the fracturing equipment is driven by an engine, which has low power density, high noise, and serious emission pollution. As a new type of fracturing equipment, electric drive fracturing is driven by an electric motor, uses electric energy as a power source, has high power density, low noise, and no exhaust emission, and is gradually applied in fracturing operations. As the main component of the driving motor, the frequency conversion system converts the AC power on site into AC power with controllable voltage and frequency, drives the motor to rotate, and can adjust the speed of the motor.

[0003] However, the frequency conversion skid in the prior art often has many electrical components, which often need to be connected to an external power source for power supply. In this way, after the frequency conversion skid is transferred to the corresponding use environment, it is often necessary to perform operations such as external power supply on the frequency conversion skid, increasing the inconvenience of operation. SUMMARY

[0004] The main purpose of the utility model is to provide a frequency conversion skid to solve the technical problem that the frequency conversion skid in the prior art needs to be powered by an external power source to power the electrical equipment of the frequency conversion skid, resulting in inconvenient operation.

[0005] To achieve the above purpose, the utility model provides a frequency conversion skid, comprising:

[0006] A transformer unit, the input end of the transformer unit is selectively connected or disconnected with an external power source, the transformer unit is used to reduce the voltage of the external power source, the transformer unit has a main output end and an auxiliary output end;

[0007] A power unit, the input end of the power unit is connected with the main output end of the transformer unit, the power unit is used to convert the AC power output by the main output end into AC power with a preset voltage and a preset frequency;

[0008] An electrical equipment, the power supply port of the electrical equipment is connected with the auxiliary output end.

[0009] Further, the transformer unit includes a main transformer and an auxiliary transformer, the main transformer has the main output end, and the auxiliary transformer has the auxiliary output end;

[0010] The electric equipment includes 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; the air conditioner and the control system are connected with the auxiliary output end.

[0011] Further, the frequency conversion skid further comprises:

[0012] A box body, the transformer unit is arranged in the box body, the box body has spaced apart air inlet and air outlet;

[0013] The electric equipment includes 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; the air conditioner and the control system are connected with the auxiliary output end.

[0014] Further, the frequency conversion skid further comprises:

[0015] A filter, the filter is arranged at the air inlet, the filter is used for filtering air passing through the air inlet; and / or,

[0016] A dustproof member, the air inlet and / or the air outlet is provided with the dustproof member, 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.

[0017] Further, the frequency conversion skid further comprises a box body, the transformer unit is arranged in the box body;

[0018] The electric equipment includes 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; the air conditioner and the control system are connected with the auxiliary output end.

[0019] The electric equipment includes 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; the air conditioner and the control system are connected with the auxiliary output end.

[0020] Further, the electric equipment further comprises:

[0021] A temperature detection member, arranged in the box body; and / or,

[0022] A dehumidification member, arranged in the box body; and / or,

[0023] A heating member, arranged in the box body; and / or,

[0024] An alarm member, arranged in the box body, when the alarm member detects smoke, the alarm member issues an alarm.

[0025] Further, the frequency conversion skid further comprises a line inlet unit, an input end of the line inlet unit being selectively connected or disconnected with an external power supply, an input end of the transformer unit being connected with an output of the line inlet unit; the line inlet unit comprises:

[0026] a pre-charging module for magnetizing and charging a capacitor of the transformer unit and / or the power unit.

[0027] Further, the pre-charging module comprises:

[0028] a charging resistor for limiting a current in a loop when the input end of the line inlet unit is connected with the external power supply;

[0029] a vacuum contactor connected with the charging resistor, the vacuum contactor disconnecting the loop when the current in the loop is greater than a preset current;

[0030] a circuit breaker for connecting or disconnecting the loop.

[0031] Further, the frequency conversion skid further comprises a line inlet unit and a box body, the box body having a first accommodating cavity, a second accommodating cavity and a third accommodating cavity arranged at intervals, the line inlet unit being arranged in the first accommodating cavity, the transformer unit being arranged in the second accommodating cavity, and the power unit being arranged in the third accommodating cavity;

[0032] wherein, the first accommodating cavity and the third accommodating cavity are respectively located on two sides of the second accommodating cavity; and / or,

[0033] the second accommodating cavity is provided with a first heat dissipation unit; and / or,

[0034] the third accommodating cavity is provided with a second heat dissipation unit.

[0035] Further, the box body comprises a first cabinet, a second cabinet, a third cabinet and a bearing base, the first cabinet has the first accommodating cavity, the second cabinet has the second accommodating cavity, and the third cabinet has the third accommodating cavity;

[0036] wherein, the first cabinet and the second cabinet are detachably connected, and a first buffering structure is arranged at a connection between the first cabinet and the second cabinet; and / or,

[0037] the second cabinet and the third cabinet are detachably connected, and a second buffering structure is arranged at a connection between the second cabinet and the third cabinet; and / or,

[0038] the second cabinet and the third cabinet are in a closed structure; and / or,

[0039] At least one of the first cabinet body, the second cabinet body and the third cabinet body is provided with a damping buffer member with the bearing base.

[0040] Further, the power unit comprises a rectifier module and an inverter module.

[0041] The rectifier module and the inverter module each comprise a heat dissipation member having a heat dissipation channel; the variable frequency skid further comprises a heat dissipation pipe member in communication with the heat dissipation channel, the heat dissipation pipe member being arranged separately from the power unit in different cavities; and / or,

[0042] The power unit further comprises a frame structure, a plurality of capacitors, a first connecting busbar and a second connecting busbar, the rectifier module, the inverter module and the plurality of capacitors being mounted in mounting grooves of the frame structure; the first connecting busbar is used for connecting with the rectifier module and a part of the plurality of capacitors; and the second connecting busbar is used for connecting with the inverter module and another part of the plurality of capacitors.

[0043] The technical scheme of the utility model, through the power unit can convert the alternating current output by the main output end into alternating current with preset voltage and preset frequency, so as to facilitate the power supply to the external fracturing equipment; the alternating current output by the auxiliary output end can facilitate the power supply to the electric equipment self-provided by the variable frequency skid, so that the electric equipment self-provided by the variable frequency skid does not need to be powered by an external power supply, avoiding the complexity of external wiring caused by external power supply and the complexity of operation. By integrating the transformer unit, the power unit and the electric equipment, an efficient and compact variable frequency power supply solution is realized. In particular, by separating the heat dissipation pipeline of the power unit from the power unit, the damage of the heat dissipation pipeline and the outflow of the heat dissipation liquid are effectively avoided, which will not affect the normal operation of the live power unit, thus facilitating the protection of the power unit and improving the stability and service life of the equipment. At the same time, by setting the adjustable dustproof member and the filter member, the cleanliness inside the box is ensured, and the reliability and maintenance convenience of the system are further enhanced. In addition, by designing the box as a detachable multi-cavity structure and setting a buffer structure at the connection, not only is the installation and maintenance of the equipment facilitated, but also the vibration and noise during operation are effectively reduced, and the overall user experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0044] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application, serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0045] Figure 1 A structure schematic view of a variable frequency skid according to an embodiment of the present application is shown;

[0046] Figure 2 A top view of a variable frequency skid according to an embodiment of the present application is shown;

[0047] Figure 3 A schematic view of an internal structure of a variable frequency skid according to an embodiment of the present application is shown;

[0048] Figure 4 A schematic view of an internal structure of a third cabinet according to an embodiment of the present application is shown;

[0049] Figure 5 A schematic view of a structure of a heat dissipation pipe and a partition plate according to an embodiment of the present application is shown;

[0050] Figure 6 A schematic view of a connection structure of a power unit according to an embodiment of the present application is shown.

[0051] Among them, the above-mentioned drawings include the following reference signs:

[0052] 10, transformer unit;

[0053] 20, power unit; 21, frame structure; 22, rectifier module; 23, inverter module; 24, capacitor; 25, first connecting busbar; 26, second connecting busbar;

[0054] 30, cabinet; 31, first cabinet; 32, second cabinet; 33, third cabinet;

[0055] 40, fan;

[0056] 50, incoming line unit;

[0057] 70, heat dissipation pipe;

[0058] 80, partition plate. DETAILED DESCRIPTION

[0059] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0060] As Figures 1 to 6As shown, the utility model provides a kind of frequency conversion sled, the frequency conversion sled includes: transformer unit 10, power unit 20 and electric equipment, the input end of transformer unit 10 is selectively connected or disconnected with external power supply, transformer unit 10 is used to reduce the voltage of external power supply, transformer unit 10 has main output end and auxiliary output end;The input end of power unit 20 is connected with the main output end of transformer unit 10, and power unit 20 is used to convert the alternating current output by main output end into alternating current with preset voltage and preset frequency;The power supply port of electric equipment is connected with auxiliary output end.

[0061] The frequency conversion sled provided in the embodiment can convert the alternating current output by main output end into alternating current with preset voltage and preset frequency by power unit 20, so as to supply power to external fracturing equipment;The alternating current output by auxiliary output end can supply power to the electric equipment carried by the frequency conversion sled, so that the electric equipment carried by the frequency conversion sled does not need external power supply, avoiding the complexity of external wiring caused by external power supply and the complexity of operation.

[0062] In the embodiment, transformer unit 10 includes main transformer and auxiliary transformer, main transformer has main output end, and auxiliary transformer has auxiliary output end.

[0063] Specifically, the frequency conversion sled further includes box body 30, and main frequency converter and auxiliary frequency converter are both installed in box body 30, so as to effectively protect main frequency converter and auxiliary frequency converter.

[0064] In the embodiment, the frequency conversion skid further comprises a box 30, the transformer unit 10 is arranged in the box 30, and the box 30 is provided with an air inlet and an air outlet which are spaced apart. The electrical equipment 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. By adopting the structure, the external air can be blown into the box 30 or the air in the box 30 can be blown out of the external environment by the fan 40, so that the temperature in the box 30 can be effectively reduced, and the normal operation of the structure in the box 30 is ensured.

[0065] Specifically, the frequency conversion skid further comprises a filter, the filter is arranged at the air inlet, and the filter is used for filtering the air passing through the air inlet. By adopting the structure, the air quality entering the air inlet can be effectively ensured, and the external dirty impurities can be prevented from entering the box 30, so that the structure in the box 30 can be effectively protected.

[0066] Specifically, the frequency conversion skid further comprises a dustproof piece, the dustproof piece is arranged at the air inlet and / or the air outlet, and the dustproof piece 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. By adopting the structure, when the dustproof piece is in the closed position, the box 30 can be effectively closed, so that the box 30 is prevented from contacting the external environment, and the components in the box 30 are effectively protected; when the dustproof piece is in the open position, the air in the box 30 can be communicated with the external air, so that the air in the box 30 can be effectively adjusted. Generally, the air with high temperature in the box 30 can be discharged to play a heat dissipation role, so that the temperature in the box 30 is reduced, and the structure in the box 30 can be normally operated.

[0067] Specifically, the dustproof piece can be a louver or a dustproof cloth.

[0068] In the embodiment, the frequency conversion skid further comprises a box 30, the transformer unit 10 is arranged in the box 30.

[0069] The electrical equipment comprises a water-cooled radiator, and the water-cooled radiator has a heat exchange pipeline, at least a part of the heat exchange pipeline is arranged in the box 30. By adopting the structure, the temperature in the box 30 can be adjusted by the water-cooled radiator, so that the structure in the box 30 can be better ensured to be stably operated in a suitable temperature range.

[0070] Specifically, the electrical equipment comprises an air conditioner, and an indoor unit of the air conditioner is arranged in the box 30, so that the temperature in the box 30 can be better flexibly controlled and adjusted, and the structure in the box 30 can be better ensured to be stably operated in a suitable temperature range.

[0071] In the embodiment, the electric appliance further comprises a temperature detecting member, which is arranged in the box 30 to facilitate real-time detection of the temperature in the box 30.

[0072] Specifically, the electric appliance further comprises a dehumidifying member, which is arranged in the box 30 to adjust the humidity in the box 30, so as to avoid the case that the humidity in the box 30 is too high, and effectively ensure the stable operation of the structure in the box 30.

[0073] Specifically, the electric appliance further comprises a heating member, which is arranged in the box 30. In this way, when the temperature in the box 30 is low, the heating member can heat the temperature in the box 30, so as to avoid the case that the structure in the box 30 cannot be normally started due to the too low temperature in the box 30.

[0074] Specifically, the electric appliance further comprises an alarm member, which is arranged in the box 30 and gives an alarm when detecting smoke. With such a structure, the safe operation of the frequency conversion skid can be effectively ensured, and timely alarm can be given in the case of fire, so as to avoid the case of abnormal operation.

[0075] In the embodiment, 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, which is used to magnetize and charge the capacitor 24 of the transformer unit 10 and / or the power unit 20. In this way, the capacitor 24 can be quickly and stably charged when the device is started, the large current impact at the starting moment is avoided, the service life of the capacitor 24 and the whole system is prolonged, and the pre-charging module is particularly suitable for the occasions that need to be frequently started and stopped.

[0076] Specifically, the pre-charging module can magnetize and charge the transformer unit 10 and the capacitor 24 at the rear part before the main power supply is connected to the transformer unit 10, so as to prevent the impact on the power grid after being directly connected to the main power supply, and reduce the charging current when being powered on.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] Specifically, the frequency conversion skid further comprises an incoming line unit 50 and a cabinet 30, the cabinet 30 has a first accommodating cavity, a second accommodating cavity and a third accommodating cavity arranged at intervals, the incoming line unit 50 is arranged in the first accommodating cavity, the transformer unit 10 is arranged in the second accommodating cavity, and the power unit 20 is arranged in the third accommodating cavity. In this way, the incoming line unit 50, the transformer unit 10 and the power unit 20 can be respectively placed in different accommodating cavities, so as to facilitate modular management and maintenance and facilitate operation.

[0082] Specifically, the first accommodating cavity and the third accommodating cavity are respectively located on both sides of the second accommodating cavity, so as to facilitate the layout of the structure and facilitate the wiring operation of each unit.

[0083] Specifically, the second accommodating cavity is provided with a first heat dissipation unit, so as to facilitate heat dissipation operation of the transformer unit 10.

[0084] Specifically, the third accommodating cavity is provided with a second heat dissipation unit, so as to facilitate heat dissipation operation of the power unit 20.

[0085] In the embodiment, the cabinet 30 comprises a first cabinet body 31, a second cabinet body 32, a third cabinet body 33 and a bearing base, the first cabinet body 31 has the first accommodating cavity, the second cabinet body 32 has the second accommodating cavity, and the third cabinet body 33 has the third accommodating cavity.

[0086] Specifically, the first cabinet body 31 is detachably connected with the second cabinet body 32, and the connection part of the first cabinet body 31 and the second cabinet body 32 is provided with a first buffer structure. In this way, assembly can be facilitated, and the first cabinet body 31 and the second cabinet body 32 can be effectively protected from being subjected to a large impact during transportation and use.

[0087] Specifically, the second cabinet body 32 is detachably connected with the third cabinet body 33, and the connection part of the second cabinet body 32 and the third cabinet body 33 is provided with a second buffer structure. In this way, assembly can be facilitated, and the first cabinet body 31 and the second cabinet body 32 can be effectively protected from being subjected to a large impact during transportation and use, so as to meet the vibration reduction requirement of the equipment.

[0088] Specifically, the first buffer structure and the second buffer structure can adopt elastic components of rubber or polyurethane plate, and the second cabinet body 32 in which the transformer unit 10 is installed can adopt an elastic damping component with stronger rigidity.

[0089] Specifically, the second cabinet body 32 and the third cabinet body 33 are in a closed structure, so as to effectively protect the transformer unit 10 and the power unit 20.

[0090] Specifically, at least one of the first cabinet 31, the second cabinet 32 and the third cabinet 33 is provided with a damping buffer member with the bearing base. In this way, the first cabinet 31, the second cabinet 32 and the third cabinet 33 can be effectively damped and buffered, avoiding the situation that the first cabinet 31, the second cabinet 32 and the third cabinet 33 are subjected to a large impact during use or transportation, and meeting the damping requirements of the equipment.

[0091] Specifically, the damping buffer member can be a damping spring.

[0092] In the embodiment, the power unit 20 includes a rectifier module 22 and an inverter module 23.

[0093] Specifically, the rectifier module 22 and the inverter module 23 each include a heat dissipation member having a heat dissipation channel; the variable frequency sled further includes a heat dissipation pipe member 70 in communication with the heat dissipation channel, and the heat dissipation pipe member 70 is separately arranged in a different chamber from the power unit 20. With such a structure design, the heat dissipation pipe member 70 can be separated from the power unit 20, avoiding the situation that the heat dissipation liquid leaks to the power unit 20, and effectively protecting the power unit 20. Specifically, the heat dissipation pipe member 70 and the power unit 20 are separated in different chambers by a partition plate 80, the power unit 20 is arranged on one side of the partition plate 80, the heat dissipation pipe member 70 is arranged on the partition plate 80, a part of the heat dissipation pipe member 70 is located on one side of the partition plate 80 and is in communication with the heat dissipation member, and the other part of the heat dissipation pipe member 70 and the heat dissipation liquid driving pump are located on the other side of the partition plate 80, so as to be effectively separated by the partition plate 80.

[0094] Specifically, the power unit 20 further includes 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 mounted in mounting grooves of the frame structure 21; the first connecting busbar 25 is used to connect with the rectifier module 22 and a part of the plurality of capacitors 24; and the second connecting busbar 26 is used to connect with the inverter module 23 and another part of the plurality of capacitors 24. With such a module and frame structure 21 assembly, an integrated modular structure can be formed, which is convenient for maintenance and management, and facilitates assembly operation.

[0095] Specifically, the transformer unit 10 in the embodiment functions to step down the main power supply to reach the voltage level of the power unit 20, and mainly comprises a transformer winding, a winding temperature sensor, a cooling fan 40 and an air duct. The transformer unit 10 is installed in the second cabinet 32 and fixed on a bearing base at the bottom of the box 30 through a damping unit. An air inlet and an air outlet are installed on the second cabinet 32. The air inlet is provided with a filter screen to filter water vapor and dust, and the air outlet is provided with the fan 40 to discharge the hot air in the cabinet to the outside to cool the transformer unit 10 in the second cabinet 32. The air inlet is provided in a natural air inlet form or a form of being additionally provided with the fan 40 to ensure the air inlet amount, and the air outlet is provided in a form of being provided with the exhaust fan 40 to discharge the internal hot air through a self-falling louver. When the exhaust fan 40 is not working, the self-falling louver can ensure that the inside of the cabin is isolated from the outside to prevent moisture, dust and other sundries from entering the transformer cabin. An extendable dustproof cover is installed outside the air inlet and the air outlet. The cover can be pulled down for dust prevention during transportation and pulled open for air inlet and outlet during operation. The transformer unit 10 is further provided with a dehumidifying device and a heating device inside to heat the cabin and prevent the generation of condensed water. In order to prevent the loss caused by fire, a smoke alarm device is installed in the equipment to alarm in time when smoke is found.

[0096] Specifically, another form of the transformer unit 10 is a high-protection-grade transformer which can meet the protection requirements of the operation environment without the aid of a special cabin. The form of the transformer is not limited to oil-immersed transformers, fully-enclosed transformers and all other forms of transformers that meet the requirements of external waterproofing and dustproofing. The heat dissipation form of the high-protection transformer is not limited to forced air cooling, air fin cooling, oil pump circulation heat dissipation and other forms. Similarly, the transformer is connected and fixed to the cabin through damping components.

[0097] Specifically, the heat dissipation form of the transformer unit 10 can be forced air cooling, closed air-water cooling and air conditioning heat dissipation. Forced air cooling discharges the air in the cabin through the air inlet and outlet fan 40 or only the exhaust fan 40 to achieve heat dissipation of the transformer. The closed air-water cooling form places the transformer in a closed cabin without air inlets and outlets, completely isolates the transformer from the external environment and completely avoids the influence of moisture and dust on the equipment. An air-water heat exchange device is installed in the second cabinet 32 to cool the liquid in the heat exchange device and exchange heat with the air in the cabin to reduce the heat in the cabinet. The air conditioning heat dissipation form also installs the transformer unit 10 in the closed second cabinet 32, and reduces the temperature of the hot air in the cabinet through a high-power air conditioner to ensure that the temperature of the transformer is within a safe range.

[0098] In the embodiment, the transformer unit 10 comprises a main winding and an auxiliary winding, the main winding has a main output section, and the auxiliary winding has an auxiliary output end. The power supply converted by the main winding is used to supply the rectifier unit in the rear. The power supply converted by the auxiliary winding is used to supply the auxiliary system of the frequency conversion device and the power supply of external devices, and the auxiliary devices include the fan 40 used by the transformer and the water pump used by the heat dissipation system.

[0099] Specifically, the power unit 20 is used to convert the alternating power supply converted by the transformer unit 10 into direct current power supply. The power unit 20 can be divided into a rectifier unit, an inverter unit and a capacitor 24. The rectifier unit converts the alternating power supply into direct current power supply. The inverter unit converts the direct current unit into alternating power supply with controllable voltage and frequency. The capacitor 24 is used to buffer energy. The power unit 20 is installed in the closed third cabinet 33 to avoid the influence of dust and moisture. At the same time, the air conditioner and the heater installed in the cabinet are used to ensure that the temperature and humidity in the cabinet are within a suitable range. The smoke detector installed in the third cabinet 33 sends an alarm when smoke is detected. The structure of each power unit 20 is composed of power elements used to switch circuits, water-cooled plates used to cool the power unit 20, and laminated busbars connected to the power unit 20. The structure of the power unit 20 adopts the form of double-sided placement of elements (including IGBT, diode, power resistor, etc.) to reduce the space area.

[0100] Specifically, the power unit 20 adopts a frame structure, and all the power units 20 and the capacitor 24 are assembled together by a frame made of metal or insulating material. The upper part of the frame is used to place the power unit 20 components, including the rectifier unit and the inverter unit. The bottom of the frame is used to place the capacitor 24 elements. The electrical connection of all the power unit 20 and capacitor 24 elements is realized by the laminated busbars placed in the front. The rear of the power unit 20 is provided with an inlet and outlet water pipeline connector for heat dissipation. The connector is designed in the form of quick plug-in to ensure that the liquid in the pipeline does not flow out to cause pollution during maintenance, and to improve the replacement efficiency.

[0101] The overall structure of the frequency conversion skid provided in the embodiment can facilitate installation, maintenance and transfer, can be easily installed on a mobile transport vehicle, has the advantages of compact structure, high protection and easy transportation, etc. The frequency conversion skid can convert alternating power supply into alternating power supply with controllable frequency and voltage to drive the motor to rotate, so as to achieve the purpose of adjusting the motor speed.

[0102] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects: the frequency conversion skid is combined with the high-efficiency heat dissipation system, the environment control and the safety monitoring equipment, and the modular, detachable box body structure through the integrated transformer unit, the power unit and the various electric equipment, not only improves the integration and the operation efficiency of the equipment, but also enhances the stability and the safety of the equipment, is applicable to the fracturing equipment use occasion, and can provide the stable, efficient, safe power conversion and control solution.

[0103] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0104] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application, unless otherwise specifically stated. It should be understood that the dimensions of the various parts shown in the drawings are not necessarily to scale, for the sake of convenience in description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the specification where appropriate. In all examples shown and discussed herein, any specific value is to be interpreted as merely an example, and not as a limitation. Thus, other examples of the example embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0105] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without the opposite indication, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0106] For purposes of the description hereinafter, spatial

[0107] In addition, it should be noted that the use of the terms "first", "second", etc., to describe a component having a defined property is only intended to distinguish between that component and another component having a different defined property, and is not otherwise intended to limit the scope of the present application unless otherwise indicated. Thus, use of the term "first" to describe a component is intended to connote that the component so qualified is not necessarily described first, but is intended to serve its qualification purpose in distinguishing that component from another component which is "second" in order of description.

[0108] The preferred embodiments of the present application have been described above with the intent to enable those skilled in the art to make and use it. Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, to the extent that the present application is limited by any terms imposed by law, the specific terms are intended to be interpreted in accordance with the broadest possible interpretation consistent with the requirements of the prior art.

Claims

1. A variable frequency skid, characterized in that, include: A transformer unit (10) is provided, the input terminal of which 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. Power unit (20), the input end of the power unit (20) is connected to the main output end of the transformer unit (10), the power unit (20) is used to convert the AC power output from the main output end into AC power with a preset voltage and preset frequency; Electrical equipment, wherein the power supply port of the electrical equipment is connected to the auxiliary output terminal; An input unit (50) is provided, the input terminal of which can be selectively connected to or disconnected from an external power source, and 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 is used to magnetize and charge the capacitors (24) of the transformer unit (10) and / or the power unit (20).

2. The variable frequency skid according to claim 1, characterized in that, The transformer unit (10) includes a main transformer and an auxiliary transformer. The main transformer has the main output terminal, and the auxiliary transformer has the auxiliary output terminal. 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.

3. The variable frequency skid according to claim 1, characterized in that, The variable frequency skid also includes: The housing (30) contains the transformer unit (10) and has an air inlet and an air outlet spaced apart. The electrical equipment includes a fan (40), the power supply port of the fan (40) is connected to the auxiliary output terminal, and the fan (40) is located at the air inlet or air outlet.

4. The variable frequency skid according to claim 3, characterized in that, The variable frequency skid also includes: A filter element, wherein the filter element is disposed at the air inlet, the filter element being used to filter the air passing through the air inlet; and / or, A dustproof component is provided at the air inlet and / or the air outlet. The dustproof component is movably configured to move to an open position that avoids the air inlet and / or the air outlet, and to a closed position that blocks the air inlet and / or the air outlet.

5. The variable frequency skid according to claim 1, characterized in that, The variable frequency skid also includes a housing (30), and the transformer unit (10) is disposed inside the housing (30); The electrical equipment includes a water-cooled radiator, which has heat exchange pipes, at least a portion of which is disposed within the housing (30); and / or, The electrical equipment includes an air conditioner, and the indoor unit of the air conditioner is installed inside the housing (30).

6. The variable frequency skid according to any one of claims 3 to 5, characterized in that, The electrical equipment also includes: Temperature sensing element, disposed within the housing (30); and / or, Dehumidifiers are disposed within the housing (30); and / or, Heating element, disposed within the housing (30); and / or, An alarm device is installed inside the housing (30) and sounds an alarm when the alarm device detects smoke.

7. The variable frequency skid according to claim 1, characterized in that, The pre-charge module includes: The charging resistor is used to limit the current in the circuit when the input terminal of the input unit (50) is connected to the external power supply. A vacuum contactor is connected to the charging resistor; when the current in the circuit is greater than a preset current, the vacuum contactor disconnects the circuit. A circuit breaker, used to connect or disconnect the circuit.

8. The variable frequency skid according to claim 3, characterized in that, The frequency converter skid also includes an inlet unit (50) and a housing (30). The housing (30) has a first accommodating cavity, a second accommodating cavity and a third accommodating cavity arranged at intervals. The inlet unit (50) is disposed in the first accommodating cavity, the transformer unit (10) is disposed in the second accommodating cavity, and the power unit (20) is disposed in the third accommodating cavity. Wherein, the first receiving cavity and the third receiving cavity are respectively located on both sides of the second receiving cavity; and / or, The second receiving cavity is provided with a first heat dissipation unit; and / or, The third accommodating cavity is equipped with a second heat dissipation unit.

9. The variable frequency skid according to claim 1, characterized in that, The power unit (20) includes a rectifier module (22) and an inverter module (23); The rectifier module (22) and the inverter module (23) both include heat sinks, and the heat sinks have heat dissipation channels; the frequency converter skid also includes a heat dissipation pipe (70), which is connected to the heat dissipation channels, and the heat dissipation pipe (70) and the power unit (20) are separated and arranged in different chambers; and / or, 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), the inverter module (23) and the multiple capacitors (24) are all installed in the mounting slot of the frame structure (21). The first connecting busbar (25) is used to connect to a part of the rectifier module (22) and the multiple capacitors (24). The second connecting busbar (26) is used to connect to another part of the inverter module (23) and the multiple capacitors (24).

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