High-power integrated internal fuel gas driven fracturing pump set

Abstract

The invention discloses a high-power integrated internal combustion engine power generation electrically-driven fracturing pump trailer set which comprises two sets of integrated internal combustion engine power generation electrically-driven fracturing pump trailers and a set of integrated cooling trailer. Each set of fracturing pump trailer comprises a trailer chassis, and a high-power internal combustion engine, a transfer gearbox, a plurality of generators, a PWM power generation controller cabinet, an inverter controller cabinet, a plurality of driving motors, a resultant force planetary gear reduction gearbox and a fracturing pump are sequentially mounted on the trailer chassis from right to left; the cooling trailer comprises a cooling trailer chassis, two sets of cooling systems are arranged on the front portion and the rear portion of the cooling trailer chassis, and each set of cooling system comprises an internal combustion engine cylinder cooling unit, an internal combustion engine intercooling unit, a generator and PWM power generation controller cabinet, an inverter controller cabinet and a driving motor cooling unit. A fracturing pump of a traditional electric-driven fracturing pump is integrated with the motor unit, the rectification inversion unit and the power supply unit, high power is achieved, and the electric-driven fracturing pump has the advantages of being small in occupied area, light in weight and convenient and fast to move, install and transport.

Description

Technical Field

[0001] This invention relates to the field of oil drilling equipment technology, and in particular to a high-power integrated internal combustion engine generator-electrically driven fracturing pump trailer assembly. Background Technology

[0002] In recent years, shale oil and gas extraction technology has flourished, leading to the emergence of various extraction technologies and equipment. Among these, fracturing is currently one of the most effective measures to improve oil and gas well recovery rates, and has become a major means of transforming low-permeability oil and gas reservoirs and developing deep oil and gas reservoirs. Furthermore, with the development of fracturing technology, high-power, integrated, and easily transportable fracturing trucks have become the mainstream trend in fracturing equipment development. As the core surface equipment for reservoir fracturing and transformation, the fracturing truck's main function is to draw in fracturing fluid, pressurize it, and inject it into the well bottom to perform fracturing and transformation of the reservoir.

[0003] Currently, the mainstream vehicle-mounted internal combustion engine-driven fracturing trucks in China are easy to install and move, but their power is relatively small, generally below 3500HP, which can no longer meet market development needs. While electric fracturing skids have high power, with mainstream products being 5000-6000HP electric fracturing skids, they generally need to be divided into fracturing pump and motor units, rectifier and inverter units, power supply units, and cooling units. This results in high investment and a large footprint, posing significant challenges to installation and relocation. Summary of the Invention

[0004] The purpose of this invention is to provide a high-power integrated internal combustion engine generator-electrically driven fracturing pump trailer unit. Using an internal combustion engine as the energy source, it can provide power requirements of more than 3500HP. It integrates the fracturing pump, motor unit, rectifier-inverter unit and power supply unit of the traditional electric fracturing pump into one unit. The cooling system is independently carried and operated. It not only achieves high power, but also has the advantages of small footprint, light weight and convenient relocation and installation.

[0005] The technical solution adopted in this invention is as follows: A high-power integrated internal combustion engine generator-electric drive fracturing pump trailer assembly includes two integrated internal combustion engine generator-electric drive fracturing pump trailers and one integrated cooling trailer. Each integrated internal combustion engine generator electric drive fracturing pump trailer includes a trailer chassis, on which, from right to left, are installed a high-power internal combustion engine, a transfer gearbox, multiple generators, a PWM generator controller cabinet, an inverter controller cabinet, multiple drive motors, a combined planetary gear reducer and a fracturing pump. The power output shaft of the internal combustion engine is connected to the power input end of the transfer gearbox. The multiple output shafts of the transfer gearbox are connected to multiple generators. The power output port of each generator is connected to each PWM generator controller in the PWM generator controller cabinet. Then, through each one-to-one inverter controller in the inverter controller cabinet, they are connected to the corresponding multiple drive motors. That is, the power output end of each generator supplies power to the drive motor through a PWM generator controller and an inverter controller in sequence. The output shafts of the multiple drive motors are connected to the input end of a planetary gear reducer. The output shaft of the planetary gear reducer is connected to the crankshaft end of the fracturing pump to supply power to the fracturing pump. The integrated cooling trailer includes a cooling trailer chassis with two sets of cooling systems installed at the front and rear. Each cooling system includes an internal combustion engine cylinder cooling unit, an internal combustion engine intercooling unit, a generator and PWM generator controller cabinet, an inverter controller cabinet, and a drive motor cooling unit. The internal combustion engine cylinder cooling unit and the internal combustion engine intercooling unit cool the internal combustion engine with water. The generator and PWM generator controller cabinet, the inverter controller cabinet, and the drive motor cooling unit are all cooled with water. Both the trailer chassis and the cooling trailer chassis include a chassis, a wheel system, and a towing connection device.

[0006] The aforementioned transfer gearbox includes an input gear shaft and input gear, a transfer housing, a sealing ring, and multiple output gear shafts and output gears. The multiple output gear shafts are circumferentially distributed around the input gear shaft and are connected to multiple permanent magnet synchronous generators via couplings or an integrated structure. The multiple output gears mesh with the input gears. The input gear shafts and output gear shafts are fixed to the side plate of the transfer housing via bearings and sealed to the transfer housing via sealing rings. The speed ratio of the transfer gearbox is the ratio of the generator's rated speed to the internal combustion engine's rated speed.

[0007] The internal combustion engine mentioned above is a diesel engine with a power of 3500HP or more, or a gas engine or methanol engine with a power of 2000HP or more.

[0008] The generators mentioned are permanent magnet synchronous generators, and the number is two or more.

[0009] The PWM generator controller is a fully controlled rectifier controller equipped with IGBT switching devices, and the number of such controllers is two or more.

[0010] The inverter controllers are the same number as the generators, and are connected one-to-one with the PWM generator controllers. They are connected to DC power and output AC power with controllable frequency, controlling multiple motors one-to-one.

[0011] The electric motors mentioned are permanent magnet synchronous motors, and the number of them is the same as that of the generators.

[0012] The aforementioned planetary gear reducer includes a reducer body, multiple input gear shaft assemblies, input shafts of which extend out of the reducer body and are connected to the output shaft of a drive motor. The gears of the input gear shaft assemblies mesh with the resultant gears, and the input gear shaft assemblies are distributed circumferentially around the resultant gear shaft. The resultant gear shaft serves as the sun gear shaft of the planetary reduction gear system. The sun gear meshes with and connects to the planetary gear assembly, and is fixed to the reducer body through the planetary gear assembly. A planetary support is fixed at the center of the planetary gear assembly, and the planetary support extends out of the reducer body and docks with the end of the crankshaft.

[0013] The planetary gear assembly includes a planetary gear set, a planetary gear carrier, and an external gear ring of the planetary gear set. The planetary gear set meshes with the sun gear. The planetary gear carrier is positioned between the planetary gear sets. A crankshaft docking shaft is located at the center of the end face of the planetary gear carrier. The peripheral gears of the planetary gear set mesh with the external gear ring of the planetary gear set. The external gear ring of the planetary gear set is fixed to the inner wall of the gearbox.

[0014] This invention utilizes an internal combustion engine to drive multiple permanent magnet synchronous generators via a transfer case. The generator outputs electricity through an AC circuit breaker connected to a PWM (Pulse Width Modulation) rectifier controller. The rectified electricity then connects to an inverter controller, driving multiple permanent magnet synchronous motors one-to-one. Finally, a combined gearbox couples the output to a high-power fracturing pump. This solution fills the technological gap in integrated internal combustion engine-driven fracturing pump units exceeding 3500HP. It integrates the fracturing pump, motor unit, rectifier / inverter unit, and power supply unit of a traditional electric-driven fracturing pump into a single unit. This achieves high power output while offering advantages such as small footprint, light weight, and ease of relocation and installation. Furthermore, the internal combustion engine can be a diesel, gas, or methanol engine, among other fuels. The invention also features a separate cooling system mounted on a trailer, resulting in a more compact trailer for the integrated internal combustion engine-generator-electrically driven fracturing pump, reducing weight and mitigating heavy-load risks. The entire system is compact, lightweight, and easy to relocate and install. The generator adopts a split-box power generation and a combined-box drive structure, which enables the generator and drive motor to operate at high rated speeds, resulting in high efficiency, light weight, and reduced purchase costs. Attached Figure Description

[0015] Figure 1 This is a front view of the integrated internal combustion engine generator electric drive fracturing pump trailer of the present invention. Figure 2 For the present invention Figure 1 Enlarged view of part A in the image; Figure 3 For the present invention Figure 1 Enlarged view of part B in the image; Figure 4 This is a circuit diagram of the integrated internal combustion engine generator electric drive fracturing pump trailer of the present invention. Figure 5 This is a front view of the integrated cooling trailer of the present invention; Figure 6 This is a diagram showing the usage state of the present invention. Detailed Implementation

[0016] like Figure 1-4 and Figure 6 As shown, the present invention includes two integrated internal combustion engine generator-electrically driven fracturing pump trailers and one integrated cooling trailer; as Figure 6 As shown.

[0017] like Figure 1 As shown, each integrated internal combustion engine 1-2 generator electric drive fracturing pump 1-11 trailer includes a trailer chassis (2-1). On the trailer chassis (2-1), from right to left, are installed a high-power internal combustion engine 1-2, a transfer gearbox 1-4, multiple generators 1-5, a PWM generator controller cabinet 1-6, an inverter controller cabinet 1-7, multiple drive motors 1-8, a combined force planetary gear reducer 1-9, and a fracturing pump 1-11. like Figure 4 As shown, the power output shaft of the internal combustion engine 1-2 is connected to the power input end of the transfer gearbox 1-4 via the first coupling 1-3. The multiple output shafts of the transfer gearbox 1-4 are respectively connected to multiple generators 1-5. The power output port of each generator 1-5 is connected to each circuit breaker 1-6-1 in the PWM generator controller cabinet 1-6. Each circuit breaker 1-6-1 is connected to a PWM generator controller 1-6-2. Then, through each one-to-one inverter controller 1-7-1 in the inverter controller cabinet 1-7, they are connected to the corresponding multiple drive motors 1-8. That is, the power output end of each generator 1-5 supplies power to the drive motor 1-8 in sequence through a PWM generator controller 1-6-2 and an inverter controller 1-7-1. The output shafts of the multiple drive motors 1-8 are connected to the input end of a planetary gear reducer 1-9. The output shaft of the planetary gear reducer 1-9 is connected to the crankshaft end of the fracturing pump 1-11 via the second coupling 1-10 to supply power to the fracturing pump 1-11. like Figure 5 As shown, the integrated cooling trailer includes a cooling trailer chassis (2-1), on which two sets of cooling systems are installed at the front and rear. Each cooling system includes an internal combustion engine cylinder cooling unit 2-2, an internal combustion engine intercooling unit 2-3, a generator and PWM generator controller cabinet, an inverter controller cabinet, and a drive motor cooling unit 2-4. The internal combustion engine cylinder cooling unit 2-2 and the internal combustion engine intercooling unit 2-3 cool the internal combustion engine 1-2 with water cooling. The generator and PWM generator controller cabinet, the inverter controller cabinet, and the drive motor cooling unit 2-4 are cooled with water. Both the trailer chassis (1-1) and the cooling trailer chassis (2-1) include a chassis, a wheel system 11, and a towing connection device 12. They possess sufficient strength and reasonable structural dimensions, and comply with relevant national standards for highway driving.

[0018] like Figure 2 As shown, the transfer gearbox 1-4 includes an input gear shaft and input gear 1-4-3, a transfer housing 1-4-1, a sealing ring, and multiple output gear shafts and output gears 1-4-2. The multiple output gear shafts are distributed around the input gear shaft and are connected to multiple permanent magnet synchronous generators 1-5 via couplings or an integrated structure. The multiple output gears mesh with the input gears. The input gear shafts and output gear shafts are fixed to the side plate of the transfer housing 1-4-1 by bearings and sealed to the transfer housing 1-4-1 by the sealing ring. The speed ratio of the transfer gearbox 1-4 is the ratio of the rated speed of the generator 1-5 to the rated speed of the internal combustion engine 1-2.

[0019] The internal combustion engines 1-2 described above employ diesel engines with a power output of 3500HP or higher, or gas engines, methanol engines, or other fuel-efficient internal combustion engines with a power output of 2000HP or higher, achieving high efficiency and energy saving. This fills the technological gap of using internal combustion engines 1-2 with a power output of 3500HP or higher to generate and drive fracturing pumps 1-11 sets, or using natural gas internal combustion engines 1-2 or methanol internal combustion engines 1-2 to generate and drive fracturing pumps 1-11 sets. It achieves high power output while avoiding the impact of high-current DC and AC loads.

[0020] The generators 1-5 are permanent magnet synchronous generators, and there are two or more of them. The number of generators 1-5 in operation can be automatically switched according to the load size.

[0021] The PWM generator controller 1-6-2 described herein employs a fully controlled rectifier controller with IGBT switching devices, and the quantity is two or more units. PWM rectification ensures high power quality and low harmonic pollution.

[0022] The inverter controllers 1-7-1 are the same number as the generators 1-5, and are connected one-to-one with the PWM generator controllers 1-6-2. They are connected to DC power and output AC power with controllable frequency, controlling multiple motors one-to-one.

[0023] The motors mentioned are permanent magnet synchronous motors, and the number is the same as that of generators 1-5. The number of drive motors 1-8 in operation can also be automatically switched according to the load size.

[0024] The drive control from generators 1-5 to drive motors 1-8 employs a one-to-one approach to avoid circulating current. The electrical control topology is simple, highly reliable, and saves on components. Furthermore, when a single motor or controller fails, it does not affect the operation of other equipment, achieving power redundancy.

[0025] like Figure 3 As shown, the planetary gear reducer 1-9 includes a reducer body 1-9-1, multiple input gear shaft groups 1-9-2, the input shafts of the input gear shaft groups 1-9-2 extending out of the reducer body 1-9-1 and connected to the output shaft of the drive motor 1-8, the gears of the input gear shaft groups 1-9-2 meshing with the resultant gear, and the input gear shaft groups 1-9-2 distributed around the circumference of the resultant gear shaft 1-9-3; the resultant gear shaft 1-9-3 is coaxially connected to one end of the resultant output shaft 1-9-4, and the other end of the resultant output shaft 1-9-4 is connected to the center of the sun gear 1-9-5, the resultant gear shaft 1-9-3 is equivalent to the sun gear shaft of the planetary gear reducer system, the satellite gears 1-9-6 of the planetary gear system are distributed around the circumference of the sun gear 1-9-5, the center of the planetary gear carrier 1-9-7 is connected to the output shaft 1-9-8, and the output shaft 1-9-8 is connected to the crankshaft docking shaft through the second coupling 1-10.

[0026] The sun gear meshes with the planetary gear assembly and is fixed to the gearbox 1-9-1 via the planetary gear assembly. The planetary gear carrier is fixed at the center of the planetary gear assembly and extends out of the gearbox 1-9-1 to be connected to the end of the crankshaft via a coupling.

[0027] The planetary gear assembly includes a planetary gear set, a planetary gear carrier 1-9-7, and an external gear ring of the planetary gear set. The planetary gear set meshes with the sun gear. The planetary gear carrier is housed between the planetary gear sets. An output shaft 1-9-8 is located at the center of the end face of the planetary gear carrier and is connected to the crankshaft shaft via a coupling. The peripheral gears of the planetary gear set mesh with the external gear ring of the planetary gear set. The external gear ring of the planetary gear set is fixed to the inner wall of the reduction gearbox 1-9-1.

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] In this embodiment, five generators are used: generator 1-5, PWM generator controller 1-6-2, inverter controller 1-7-1, and drive motor 1-8. The internal combustion engine 1-2 inputs power to the transfer gearbox 1-4. The output shaft of the transfer gearbox 1-4 drives the five permanent magnet generators 1-5 to generate electricity. The five DC power supplies pass through an AC circuit breaker and are connected to the five IGBT rectifier controllers for PWM rectification into DC power. Then, they are connected one-to-one to the inverter controller 1-7-1. The DC power output after inversion drives the five drive motors 1-8. The five motors are mechanically coupled through a force box and connected to the input shaft of the fracturing pump 1-11 via the output shaft to realize the operation of the fracturing pump 1-11.

[0030] Specifically: The internal combustion engine 1-2 operates, driving the input gear of the transfer gearbox 1-4 through the first coupling 1-3. The input gear drives the five output gear shafts through meshing transmission, which in turn drive the five permanent magnet generators 1-5. The generators 1-5 generate AC power, which is connected to the five circuit breakers installed in the rectifier cabinet. The AC power is then rectified by the five IGBT rectifier controllers in the rectifier cabinet using PWM. The rectified DC power enters the inverter cabinet and is connected one-to-one to the five inverter controllers 1-7-1, which in turn drive the five permanent magnet motors. The permanent magnet motors drive the five input gear shafts on the planetary gearbox through couplings, which in turn drive the planetary gears through gear meshing. The planetary gears then drive the sun gear of the planetary gear train through the output shaft, which in turn drives the planetary carrier, which in turn drives the planetary output shaft, and finally drives the fracturing pump 1-11.

[0031] Meanwhile, the two cooling systems of the cooling trailer cool the two trailers respectively. During use, such as Figure 6As shown, two integrated internal combustion engine generator-electrically driven fracturing pump trailers are located on the left and right sides of an integrated cooling trailer. The cooling system at the front of the cooling trailer cools the trailer 1. The internal combustion engine cylinder cooling unit 2-2 cools the internal combustion engine 1-2 through water cooling pipes 100-1 and 100-2. The internal combustion engine intercooling unit 2-3 cools the internal combustion engine 1-2 through air cooling or water cooling (pipes 100-3 and 100-4). The generator and PWM generator controller cabinet, inverter controller cabinet, and drive motor cooling unit 2-4 cool the generator 1-5, PWM generator controller cabinet 1-6, inverter controller cabinet 1-7, and drive motor 1-8 through water cooling pipes 100-5 and 100-6. Similarly, the cooling system at the rear of the cooling trailer cools the trailer 1". The internal combustion engine cylinder cooling unit 2-2 cools the internal combustion engine 1-2 through water cooling pipes 200-1 and 200-2. The internal combustion engine intercooling unit 2-3 cools the internal combustion engine 1-2 through air cooling or water cooling (pipes 200-3 and 200-4). The generator and PWM generator controller cabinet, inverter controller cabinet, and drive motor cooling unit 2-4 cool the generator 1-5, PWM generator controller cabinet 1-6, inverter controller cabinet 1-7, and drive motor 1-8 through water cooling pipes 200-5 and 200-6.

[0032] This invention uses an internal combustion engine 1-2 to drive multiple permanent magnet synchronous generators 1-5 through a transfer case to generate electricity. The electricity is then connected to a PWM (Pulse Width Modulation) rectifier controller via an AC circuit breaker. After rectification, the electricity is connected to an inverter controller 1-7-1, which drives multiple permanent magnet synchronous motors one-to-one. Finally, the motors are coupled through a gearbox to drive a high-power fracturing pump 1-11. This solution fills the technical gap of integrated internal combustion engine 1-2 driving fracturing pump 1-11 groups with a capacity of 3500HP or more. It integrates the fracturing pump 1-11 of the traditional electric fracturing pump 1-11 with the motor unit, rectifier inverter unit, and power supply unit into one unit. This achieves high power while also having the advantages of small footprint, light weight, and convenient relocation and installation. Furthermore, the internal combustion engine 1-2 can be a diesel engine, a gas engine, or a methanol engine, among other fuels. Furthermore, this invention independently mounts the cooling system on a trailer, making the trailer for the integrated internal combustion engine 1-2 generator-electrically driven fracturing pump 1-11 more compact and reducing its weight, thus lowering the risk of heavy loads. The entire system also has a small footprint, is lightweight, and is easy to relocate and install. The use of a transfer case generator and a combined case drive structure enables the generator 1-5 and drive motor 1-8 to operate at high rated speeds, resulting in high efficiency, light weight, and reduced purchase costs.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-power integrated internal combustion engine generator-electric drive fracturing pump trailer assembly, characterized in that: It includes two integrated internal combustion engine generator-electrically driven fracturing pump trailers and one integrated cooling trailer; Each integrated internal combustion engine generator electric drive fracturing pump trailer includes a trailer chassis, on which, from right to left, are installed a high-power internal combustion engine, a transfer gearbox, multiple generators, a PWM generator controller cabinet, an inverter controller cabinet, multiple drive motors, a combined planetary gear reducer and a fracturing pump. The power output shaft of the internal combustion engine is connected to the power input end of the transfer gearbox. The multiple output shafts of the transfer gearbox are connected to multiple generators. The power output port of each generator is connected to each PWM generator controller in the PWM generator controller cabinet. Then, through each one-to-one inverter controller in the inverter controller cabinet, they are connected to the corresponding multiple drive motors. That is, the power output end of each generator supplies power to the drive motor through a PWM generator controller and an inverter controller in sequence. The output shafts of the multiple drive motors are connected to the input end of a planetary gear reducer. The output shaft of the planetary gear reducer is connected to the crankshaft end of the fracturing pump to supply power to the fracturing pump. The integrated cooling trailer includes a cooling trailer chassis with two sets of cooling systems installed at the front and rear. Each cooling system includes an internal combustion engine cylinder cooling unit, an internal combustion engine intercooling unit, a generator and PWM generator controller cabinet, an inverter controller cabinet, and a drive motor cooling unit. The internal combustion engine cylinder cooling unit and the internal combustion engine intercooling unit cool the internal combustion engine with water. The generator and PWM generator controller cabinet, the inverter controller cabinet, and the drive motor cooling unit are all cooled with water. Both the trailer chassis and the cooling trailer chassis include a chassis, a wheel system, and a towing connection device; The aforementioned transfer gearbox includes an input gear shaft and input gear, a transfer housing, a sealing ring, and multiple output gear shafts and output gears. The multiple output gear shafts are circumferentially distributed around the input gear shaft and are connected to multiple permanent magnet synchronous generators via couplings or an integrated structure. The multiple output gears mesh with the input gears. The input gear shafts and output gear shafts are fixed to the side plate of the transfer housing via bearings and sealed to the transfer housing via sealing rings. The speed ratio of the transfer gearbox is the ratio of the generator's rated speed to the internal combustion engine's rated speed.

2. The high-power integrated internal combustion engine generator-electrically driven fracturing pump trailer assembly according to claim 1, characterized in that: The internal combustion engine mentioned above is a diesel engine with a power of 3500HP or more, or a gas engine or methanol engine with a power of 2000HP or more.

3. The high-power integrated internal combustion engine generator-electrically driven fracturing pump trailer assembly according to claim 1, characterized in that: The generators mentioned are permanent magnet synchronous generators, and the number is two or more.

4. The high-power integrated internal combustion engine generator-electrically driven fracturing pump trailer assembly according to claim 1, characterized in that: The PWM generator controller is a fully controlled rectifier controller equipped with IGBT switching devices, and the number of such controllers is two or more.

5. The high-power integrated internal combustion engine generator-electrically driven fracturing pump trailer assembly according to claim 4, characterized in that: The inverter controllers are the same number as the generators, and are connected one-to-one with the PWM generator controllers. They are connected to DC power and output AC power with controllable frequency, controlling multiple motors one-to-one.

6. The high-power integrated internal combustion engine generator-electrically driven fracturing pump trailer assembly according to claim 5, characterized in that: The electric motors mentioned are permanent magnet synchronous motors, and the number of them is the same as that of the generators.

7. The high-power integrated internal combustion engine generator-electrically driven fracturing pump trailer assembly according to claim 1, characterized in that: The aforementioned planetary gear reducer includes a reducer body, multiple input gear shaft assemblies, input shafts of which extend out of the reducer body and are connected to the output shaft of a drive motor. The gears of the input gear shaft assemblies mesh with the resultant gears, and the input gear shaft assemblies are distributed circumferentially around the resultant gear shaft. The resultant gear shaft serves as the sun gear shaft of the planetary reduction gear system. The sun gear meshes with and connects to the planetary gear assembly, and is fixed to the reducer body through the planetary gear assembly. A planetary support is fixed at the center of the planetary gear assembly, and the planetary support extends out of the reducer body and docks with the end of the crankshaft.

8. The high-power integrated internal combustion engine generator-electrically driven fracturing pump trailer assembly according to claim 7, characterized in that: The planetary gear assembly includes a planetary gear set, a planetary gear carrier, and an external gear ring of the planetary gear set. The planetary gear set meshes with the sun gear. The planetary gear carrier is positioned between the planetary gear sets. A crankshaft docking shaft is located at the center of the end face of the planetary gear carrier. The peripheral gears of the planetary gear set mesh with the external gear ring of the planetary gear set. The external gear ring of the planetary gear set is fixed to the inner wall of the gearbox.

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