Electrically-driven pump truck

Abstract

The invention discloses an electric drive pump truck. The electric drive pump truck comprises a chassis truck arranged at the bottom; a power system, a transmission system, an electric control system and an execution system are arranged on the chassis vehicle. By using the pump truck, the defects in the prior art can be overcome, the problems of energy efficiency, control, reliability and maneuverability are solved on a single device in an overall planning mode, and the effects of energy-saving, accurate, reliable and flexible field operation are achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of engineering machinery, and particularly relates to an electric drive pump truck, and more particularly relates to an electric drive pump truck for high-pressure pumping operations such as fracturing and well cementing. BACKGROUND

[0002] High-pressure pump trucks are needed in scenarios such as oil fields that require fracturing operations. In traditional high-pressure pump trucks, such as fracturing trucks, an engine is usually used to directly drive a plunger pump through a complex mechanical transfer case. This mechanical driving method has the following defects: the engine speed must be changed according to the displacement requirement of the pump, which cannot work continuously in the best fuel economy zone, resulting in high energy consumption; the displacement and pressure of the pump are adjusted by adjusting the engine throttle and mechanical gear shifting, which is relatively slow and has limited control accuracy; the periodic load of the plunger pump directly acts on the engine transmission system, causing a huge impact and reducing the service life of key components; the large mechanical transmission mechanism occupies a large space, resulting in inflexible vehicle layout and high center of gravity.

[0003] With the development of electric drive technology, some pumping equipment that attempts to use electric power has also appeared, but there are inherent limitations in its implementation path: first, it relies on external power supply, which cannot be achieved in remote field operation sites, and the process of connecting to the grid is complex, and the capacity and quality of the grid may become a bottleneck for operation; second, it uses a large independent power generation vehicle for power supply, which solves the power supply problem, but forms a multi-device integrated system, occupies a large area, and has complex cable connection, slow system response, and low overall energy efficiency and management efficiency. The above two modes have not achieved truly integrated single-device mobile electric drive operation. SUMMARY

[0004] The present application provides an electric drive pump truck, which can overcome the shortcomings of the prior art and achieve energy saving, precision, reliability, and flexibility in field operation by solving the problems of energy efficiency, control, reliability, and mobility on a single device.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an electric drive pump truck, comprising a chassis truck arranged at the bottom; a power system, a transmission system, an electric control system, and an execution system are arranged on the chassis truck.

[0006] Preferably, the lower part of the chassis truck is provided with tires.

[0007] Preferably, the power system comprises an engine arranged on the chassis truck.

[0008] Preferably, the transmission system comprises a transfer case connected with the output shaft of the engine; and an electric generator is connected to the rear end of the transfer case.

[0009] Preferably, the power divider is provided with a main output end connected with the generator; and the power divider is further provided with at least one auxiliary output end for driving an auxiliary system of the electric drive pump truck.

[0010] Preferably, the engine is provided with at least two engines, and the two engines jointly drive the generator through the power divider.

[0011] Preferably, the execution system comprises an electric motor connected with the generator rear end; and the electric motor rear end is connected with a plunger pump.

[0012] Preferably, the generator and the electric motor are provided with radiators.

[0013] Preferably, the electric power generated by the generator is transmitted through a frequency converter to control the electric motor, thereby driving the plunger pump to operate.

[0014] Preferably, the electric control system comprises a VFD house arranged on the chassis truck.

[0015] Compared with the prior art, the present application has the following beneficial effects: 1. By directly integrating the VFD house on the chassis truck, the present application realizes a fundamental change from a "unit" to a "single truck" for the fracturing pump truck. The equipment does not need to disassemble any power and control cables between the VFD house and the pump truck during the transfer, realizes the rapid deployment ability of "getting off the truck and using, and leaving after finishing the work", and shortens the on-site preparation time from several hours to minutes; 2. The electric drive architecture adopted realizes complete decoupling of the engine and the plunger pump, so that the engine can be constantly operated in the high-efficiency interval, and the fuel consumption is significantly reduced; the frequency converter is used to steplessly adjust the speed of the electric motor, so that the pumping flow and pressure are precisely and continuously controlled; the electric drive effectively smooths the load impact, and improves the system reliability; at the same time, the architecture lays a foundation for the highly integrated layout of key components, so that a single device has excellent mobility and wide working condition adaptability; 3. The engine and the plunger pump are decoupled, and can be constantly operated at the best economic point of 1500 rpm. The entire electric drive system is in the constant power zone of 52 Hz to 96 Hz, and the electric motor efficiency is stably maintained at a high level of 96%, and the comprehensive energy efficiency is much higher than that of the traditional mechanical drive; 4. Through stepless speed regulation of the frequency converter, the system realizes continuous, precise and stable adjustment of the pump output flow from 0.452 m 3 / h to 0.833 m 3 / h, and the output pressure from 91.67 MPa to 49.72 MPa, while maintaining the rated power of 800 kW; 5. The power chain of each unit has sufficient power margin, ensuring the stability of the system during long-term operation. The electric power transmission system can smoothly absorb the periodic load impact inherent in the piston pump, avoiding direct impact on the engine and mechanical transmission system, effectively extending the service life of key components such as the engine and transfer case. The maximum torque multiplier of the motor in the entire constant power region is greater than 1.2, providing strong overload and starting capacity protection, and easily coping with complex working condition fluctuations; 6. The piston pump adopts modular design, which can be flexibly adapted to different operation requirements such as "high pressure - medium flow" or "medium pressure - large flow" by replacing 3-inch or 3.5-inch pistons, greatly expanding the application range of a single pump truck, realizing "one machine with multiple functions", and improving the investment return rate of the equipment; 7. The vehicle-mounted range-extending power generation is independent of external power grids; the unique power distribution design achieves high functional integration, enabling a single device to have complete mobile operation capability. In addition, by integrating external power supply functions, the electric drive pump truck of the present application expands its use as a "mobile power station". At the well site, a pump truck can provide power for its own operation while outputting excess power to power other electrical equipment, achieving energy sharing and optimal allocation. In extreme cases, it can even serve as the main power supply unit to provide reliable power for emergency or auxiliary power needs, enhancing the flexibility and reliability of the entire operation system; Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments thereof, which description should be taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the related art, the following will briefly introduce the drawings needed to be used in the embodiment or related art description. Obviously, the drawings in the following description are only embodiments of the present disclosure, and those skilled in the art can obtain other drawings without creative labor based on the provided drawings.

[0017] Figure 1 It is a perspective view of the electric drive pump truck of the present application; Figure 2 It is a front view of the electric drive pump truck of the present application; Figure 3 It is a front view of the electric drive pump truck of the present application; Figure 4 It is a top view of the electric drive pump truck of the present application; Figure 5 It is an enlarged view of a part of the electric drive pump truck of the present application; In the figure: 1, chassis truck, 2, tire, 3, engine, 4, transfer case, 5, generator, 6, motor, 7, piston pump, 8, radiator, 9, VFD house. DETAILED DESCRIPTION

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. 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 figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0020] 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.

[0021] Please see Figures 1-5 The present invention provides a technical solution: An electric pump truck includes a chassis 1 and a power system, transmission system, electronic control system and execution system mounted on the chassis 1.

[0022] The power system comprises an engine 3. The transmission system comprises a transfer case 4, the input end of which is connected to the output shaft of the engine 3, the transfer case 4 is provided with a main output end for driving a generator 5, and at least one power take-off (PTO) for driving an auxiliary system. The execution system comprises a plunger pump 7 driven by an electric motor 6, the electric motor 6 is connected with the plunger pump 7 through a reduction box. The electric control system comprises a frequency converter and a system controller; wherein the power generated by the generator 5 is transmitted and the electric motor 6 is controlled through the frequency converter, so as to drive the plunger pump 7; the system controller is used for coordinating the operation of the engine 3, the frequency converter and the auxiliary system. Further, the plunger pump 7 is a replaceable modular component, which can adapt to the requirements of different working pressures and flow rates.

[0023] The execution system comprises an electric motor 6 and a plunger pump 7 driven thereby. The electric motor 6 is preferably a three-phase asynchronous motor with a cooling fan, the output shaft of which is connected with the plunger pump 7 through a reduction box, forming an independent electric drive execution module. The electric control system comprises a VFD room, which is a separate modular compartment, fixedly installed on the frame of the chassis vehicle 1, and forms a unified work platform with the chassis vehicle 1, which can be jointly transported. The electric energy generated by the generator 5 is transmitted to the VFD room, and after being processed by a transformer and a frequency converter, the electric motor 6 is driven; the VFD room is the core room of the electrical control of the oil drilling rig, and is mainly used to control the output power of the generator, for example, to control which generator is online or offline, to control the power distribution and frequency adjustment of the output power of all online generators. The PLC control cabinet is the control center of the whole vehicle, and is connected with the engine, the frequency converter and the auxiliary system signal, and realizes cooperative control.

[0024] The electric drive pump truck of the application also has a thermal management system, the core of which is a horizontal radiator 8. The radiator 8 is arranged above the generator 5 and the electric motor 6, forming an efficient vertical heat dissipation structure. Through the installation position of the horizontal radiator 8 and the air flow organization, the cooling air flow generated thereby can simultaneously cover the key components arranged below, such as the engine 3, the transfer case 4, the generator 5, the electric motor 6, the plunger pump 7 and the hydraulic pipeline, for auxiliary air cooling, thereby forming a cooperative whole vehicle thermal management system.

[0025] The VFD room 9 is specifically installed at a position above the second axle of the chassis vehicle 1.

[0026] Specifically, the power system adopts a single high-power diesel engine 3 as the only prime mover. In this way, a compact and single-controlled power source can be formed, achieving the highest system integration and cost-effectiveness. Of course, the configuration of the power system is not limited to this. According to the needs of redundancy backup and power segmentation control, other forms can also be used. For example, two medium-sized engines 3 with a rated power of about 450kW are used in parallel to drive the same generator 5. This configuration can continue to operate at half power when one of the engines 3 fails, significantly improving the task reliability of remote well site operations. Alternatively, in the case of extremely severe load fluctuations, one engine 3 can be configured to be always on, and the other engine can be configured as a peak power supplement to optimize fuel economy.

[0027] The engine 3 uses diesel fuel. It can be understood that the energy type of the engine 3 is not limited to this and can be adaptively selected according to the energy endowment and environmental protection requirements of the operation site. For example, in areas rich in natural gas resources, gas engines 3 or even dual-fuel engines 3 can be used to significantly reduce operating costs and reduce carbon emissions.

[0028] Specifically, a 50Hz, 1500rpm, 904Kw generator 5 can be used. It can be understood that the technical type of the generator 5 is not limited to this. For example, in the scenario of pursuing higher power density and efficiency, a permanent magnet synchronous generator 5 can be used, which has the advantages of small size and more flat efficiency curve, and is especially suitable for operation environments with frequent changes in working conditions. Of course, in the case of considering cost and reliability comprehensively, it is also a feasible alternative solution to continue to use the mature and easy-to-maintain asynchronous generator.

[0029] The VFD house 9 is directly fixed to the chassis car girder as a modular compartment, realizing true single-vehicle integration operation. It can be understood that the integration method of the VFD house 9 is not limited to this. For example, in the scenario of needing to extremely reduce the center of gravity of the whole vehicle or optimize the chassis layout, the VFD house 9 can be designed as a split structure, and the main components such as the high-voltage switch cabinet, transformer, frequency converter, etc. in the interior are integrated in different reserved spaces of the chassis frame. The electrical connection is made through the rigid busbar and the standardized interface, so that higher layout design freedom can be obtained while maintaining the integrity of the whole vehicle function. Embodiment one:

[0030] An electrically driven pump truck, comprising: a chassis car 1, a power system, a transmission system, an execution system and an electric control system.

[0031] The power system, the transmission system, the execution system and the electric control system are respectively arranged on the chassis car 1.

[0032] The power system includes an engine 3 with a rated power of 880Kw and a rated speed of 1500rpm.

[0033] The transmission system includes a transfer case 4 and a generator 5, wherein the output power of the engine 3 is connected to the transfer case 4, the transfer case 4 is provided with an input end, an output end and two PTO ports. Among them, the main drive path is the main output end of the transfer case 4 driving the generator 5, which converts mechanical energy into electrical energy, the auxiliary drive path is the first PTO port driving the lubricating pump, which provides forced lubrication for the plunger pump 7; the second PTO port drives the closed pump to provide power cooling for the radiator 8.

[0034] The execution system includes a drive motor 6 and a working pump plunger pump 7. The rated power of the drive motor 6 is 800 Kw, the constant power speed range is 1002-1900 r / min, the motor 6 drives a five-cylinder plunger pump 7 through a reduction gearbox with a reduction ratio of 7.944, and the plunger pump 7 adopts modular design.

[0035] The core of the electric control system is a VFD house 9, which adopts modular design and solid compartment structure, and is directly fixed and installed on the second bridge of the chassis car 1 above the beam area. This layout makes full use of the load bearing space of the chassis car 1, optimizes the axle load distribution, and significantly reduces the vehicle gravity center. The vehicle-mounted integrated VFD house 9 integrates all necessary electrical equipment. Since the VFD house 9 has become part of the vehicle, compared with the traditional scheme, the transportation cost of independent VFD house 9 trailer, the time of on-site placement and leveling, and the expensive and heavy high-voltage cable required for connection between the two are completely eliminated, realizing significant optimization of operation cost and operation efficiency.

[0036] In this embodiment, the specific technical parameters of the generator 5 selected by the power generation unit are: the rated output power is 904 Kw, and under the drive of the engine 3 at the rated speed of 1500 rpm, it stably outputs 50 Hz power frequency alternating current.

[0037] In this embodiment, the specific technical parameters of the motor 6 selected by the core drive unit of the execution system are: the rated power is 800 Kw, the constant power working interval is 1002 r / min to 1900 r / min, the rated torque output is 7627 N·m at the rated point speed of 1002 r / min, and the rated working current is 930.1 A. The motor 6 is equipped with a cooling fan to ensure effective heat dissipation during continuous high-power output. This motor 6 is controlled by a frequency converter and can accurately stepless speed regulation within the constant power zone, so as to drive the plunger pump 7 to realize the required flow and pressure output.

[0038] The motor 6 drives a five-cylinder piston pump 7 through a reduction gearbox. The generator 5 has the following technical parameters: rated output power of 904 kW, and stable output of 50 Hz power frequency alternating current under the driving of the engine 3 at the rated speed of 1500 rpm. The piston pump 7 can be designed in a modular manner to adapt to different operating pressure and flow requirements. Specifically, two specifications can be used: one is equipped with a 3-inch piston, and the single-stroke displacement is 0.92 gallons; the other is equipped with a 3.5-inch piston, and the single-stroke displacement is 1.25 gallons. The maximum input power of the two specifications of the pump is 746 Kw, which is well matched with the 800 Kw motor, and the same 7.944 reduction ratio is used to connect with the engine 3.

[0039] In the embodiment of the application, the motor 6 is driven by the variable frequency power supply output by the VFD house 9. When the output frequency of the VFD house 9 is set to 50.5 Hz, the motor 6 stably operates at its rated operating point, and the specific parameters are as follows: The speed reaches 1002 r / min, the input current is 930.1 A, the output power is 800 Kw, and the output torque is 7627 N·m. At this time, the operating efficiency of the motor 6 is as high as 96%, the power factor is 0.86, and excellent energy conversion efficiency and power grid characteristics are exhibited. The maximum torque capacity is 2.32 times the rated torque, which ensures strong overload starting and impact resistance. The output shaft of the motor 6 is connected to the input end of the five-cylinder piston pump 7 through a shaft coupling. The pump is integrated with a reduction mechanism with a reduction ratio of 7.944. Therefore, the output speed of the pump is 126.13 r / min.

[0040] At this speed and corresponding displacement, the output performance of the five-cylinder piston pump 7 is as follows: Output flow: 116.04 gal / min, about 26.36 m³ / h; output pressure: 13,680.53 psi, about 94.34 MPa.

[0041] The specific working process is as follows: The operator sets the required working condition through the control system, and the VFD house 9 receives the instruction and accurately outputs 50.5 Hz power supply to drive the motor 6 to the rated speed of 1002 r / min. The motor 6 transmits power to the five-cylinder piston pump 7 through the reduction mechanism, and finally converts mechanical energy into hydraulic energy to stably output the above-mentioned flow and pressure to drive the arm support hydraulic cylinder or pumping mechanism to perform high-strength and high-precision concrete pumping or large-flow drainage operation.

[0042] The following describes the embodiment of the application through three representative operating points from the start to the end in the constant power operating area, to fully illustrate the wide range and excellent ability of high efficiency and stable operation of the application: When the system needs to run at rated power 800Kw, but the output flow and pressure are adjusted according to the job requirements, the PLC control cabinet can accurately set the output frequency of the frequency converter. As shown in Table 1, the system exhibits excellent performance at three key frequency points:

[0043] High pressure working condition (Example 1, 52Hz): When the job requires higher pressure (about 91.67 MPa) and medium flow (0.452 m 3 / h), the system runs at this point. The motor 6 outputs a large torque of 7407 N·m at a speed of 1031 r / min, perfectly meeting the high thrust requirement.

[0044] Balanced working condition (Example 2, 74Hz): When the flow and pressure need to be balanced, the system runs at the middle point. The motor 6 speed increases to 1467 r / min, outputting a torque of 5208 N·m, providing a flow of 0.643 m 3 / h and a pressure of 64.42 MPa, demonstrating excellent adaptability.

[0045] High flow working condition (Example 3, 96Hz): When the job pursues maximum flow (0.833 m 3 / h) and lower pressure (49.72 MPa), the system runs at the end of the constant power zone. The motor runs at a speed of 1901 r / min, still able to maintain a power output of 800Kw.

[0046] This example fully demonstrates the advancement and superiority of the technical scheme of the present application: Three examples 1-3 clearly prove that the system has a continuous and stable constant power working interval from 52 Hz to 96 Hz. Within this interval, by adjusting the frequency, the output flow and pressure can be smoothly and inversely changed, and the total power is constant.

[0047] Within the entire frequency range of 52Hz to 96Hz, the efficiency of the motor 6 is always maintained at a very high level of 96%, which proves that the energy conversion efficiency of the present application is not affected by the dramatic change of working conditions, and always operates in the best state.

[0048] This feature makes a single device not only capable of dealing with high pressure cementing operations, but also meeting the needs of large flow fracturing construction, realizing "one machine multi-use", greatly improving the market competitiveness and field application value of the device.

[0049] As shown above, when the system is configured with the 3-inch plunger pump 7, the flow rate can be adjusted from 116.04 gal / min to 220.16 gal / min and the pressure output can be adjusted from 13680.53 psi to 7210.89 psi in the constant power region under the rated power of 800 Kw.

[0050] In addition, thanks to the modular design of the present application, the plunger pump 7 can be replaced with a 3.5-inch specification. Under the same input power of 746 Kw and the reduction ratio of 7.944, this configuration shifts the operating characteristics of the system to the direction of large flow rate. Compared with the 3-inch plunger pump 7, the 3.5-inch plunger pump 7 can output a larger flow rate at the same output rotational speed due to its single-stroke displacement of 1.25 gallons, which is suitable for work scenarios with higher flow rate requirements and slightly lower extreme pressure requirements. This flexible configuration scheme greatly expands the application range of a single pump truck.

[0051] The motor 6 described in the embodiments of the present application has the characteristics of low-speed constant torque and high-speed constant power. The present application mainly utilizes the constant power operating region, which covers a rotational speed range of about 1002 r / min to 1901 r / min. Within this range, the system continuously changes the output flow rate and pressure of the plunger pump 7 through stepless speed regulation by the frequency converter, so that it can adapt to various operating conditions from high pressure and small flow rate to low pressure and large flow rate without overloading. The constant torque region and the instantaneous overload capacity of the motor 6 are not described here.

[0052] The specific working mode of the present application is described as follows: After the equipment arrives at the work site, the diesel engine 3 is started, and the PLC control cabinet of the VFD house 9 executes the preset initialization program to accurately control and stabilize the engine 3 at the rated speed of 1500 rpm. During this stage, the transfer case 4 starts to distribute power. The main path drives the generator 5 to rotate, establishing a stable 50Hz / 904 Kw power output; the auxiliary path drives the lubricating pump and the closed pump through the two PTO ports, immediately establishing a forced lubrication circulation and a power source for the heat dissipation system of the plunger pump 7.

[0053] The operator sets the target operating parameters, such as the displacement of 0.643 m 3 / h or the pressure of 64.42 MPa, through the human-machine interface. The instruction is sent to the PLC control cabinet, which serves as the control center of the whole vehicle and immediately performs collaborative calculation and scheduling. On the power generation side, the engine 3 is maintained at a stable operation in the high-efficiency region of 1500 rpm to ensure the power generation quality; on the electric drive side, the PLC calculates the optimal operating point of the motor 6 according to the target parameters and the built-in performance MAP, and sends a vector control instruction to the frequency converter in the VFD house 9.

[0054] After receiving the instruction, the frequency converter drives the motor 6 to enter the constant power working area. The motor 6 rapidly increases the rotating speed to the target value 1467 r / min and outputs the corresponding torque 5208 N·m. During the whole process, the frequency converter samples the rotating speed, torque and current of the motor 6 in real time through high-precision sensors to form a closed-loop control, so as to ensure that the output power is stable at the rated value of 800 kW. The power of the motor 6 is increased through the reduction gearbox with a reduction ratio of 7.944, and the five-cylinder plunger pump 7 is precisely driven, so that the pump 7 accurately outputs the set flow and pressure at the input rotating speed of 184.67 r / min for operation needs.

[0055] Among them, with the dynamic response of the system thermal management unit to the load change, the heat generated by the engine 3, the hydraulic system and the frequency converter is concentrated and dissipated by the horizontal radiator 8. The cooling air flow generated by the operation of the radiator 8 simultaneously covers the transfer case 4, the generator 5, the motor 6, the plunger pump 7 and the hydraulic pipeline coiled below, and performs auxiliary air cooling. The PLC dynamically adjusts the rotating speed of the fan of the radiator 8 according to the feedback of the temperature sensors of each circuit, so as to ensure that all key components are in the optimal working temperature range.

[0056] The core technical advantage of the application is the stepless speed regulation capability in the constant power range. When the operation demand is switched from high pressure (such as 94.34 MPa) to large flow (0.833 m 3 / h), the operator only needs to change the setting, and the system can smoothly adjust the rotating speed of the motor 6 from 1002 r / min to 1900 r / min by increasing the frequency of the frequency converter (such as from 50.5 Hz to 96 Hz), while the torque of the motor 6 is automatically reduced from 7627 N·m to 4019 N·m, realizing automatic, continuous and inverse proportional adjustment of the output flow and pressure, and maintaining the rated power output and 96% efficiency of the motor 6 throughout the process.

[0057] Among them, the PLC control cabinet continuously monitors the state of the whole system. Once abnormal conditions such as low lubricating pressure, overload of the motor 6 or over-temperature of the radiator are detected, the pre-defined protection strategy will be executed immediately: first, reduce the output of the frequency converter, if the fault continues, orderly stop and report the specific fault information through the man-machine interface, to ensure the safety of the equipment.

[0058] Through the decoupling design of constant-speed high-efficiency power generation of the engine 3 and variable-frequency precise driving of the motor 6, supplemented by intelligent collaborative control and thermal management, the application realizes efficient, precise, reliable and self-adaptive operation of a single pump truck under wide working conditions, and the comprehensive performance is far superior to that of traditional mechanical driving equipment.

[0059] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. An electrically driven pump truck, characterized in that: The electric pump truck includes a chassis (1) located at the bottom; the chassis (1) is equipped with a power system, a transmission system, an electronic control system and an execution system.

2. The electrically driven pump truck according to claim 1, characterized in that: The chassis (1) is equipped with tires (2) on its underside.

3. The electrically driven pump truck according to claim 1, characterized in that: The power system includes an engine (3) mounted on the chassis (1).

4. The electrically driven pump truck according to claim 1, characterized in that: The transmission system includes a transfer case (4) connected to the output shaft of the engine (3); a generator (5) is connected to the rear end of the transfer case (4).

5. An electrically driven pump truck according to claim 4, characterized in that: The transfer case (4) is provided with a main output terminal connected to the generator (5); the transfer case (4) is also provided with at least one auxiliary output terminal for driving the electric pump truck.

6. An electrically driven pump truck according to claim 4, characterized in that: At least two engines (3) are provided, and the two engines (3) drive the generator (5) together through the transfer case (4).

7. An electrically driven pump truck according to claim 1, characterized in that: The execution system includes a motor (6) connected to the rear end of the generator (5); a plunger pump (7) is connected to the rear end of the motor (6).

8. An electrically driven pump truck according to claim 7, characterized in that: The generator (5) and motor (6) are equipped with radiators (8).

9. An electrically driven pump truck according to claim 7, characterized in that: The power generated by the generator (5) is transmitted through the frequency converter to control the motor (6), thereby driving the plunger pump (7) to operate.

10. An electrically driven pump truck according to claim 1, characterized in that: The electronic control system includes a VFD room (9) installed on the chassis (1).

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