Fracturing truck

Abstract

A fracturing truck, comprising a base (1), and a fracturing pump (2), an electric motor (3) and a frequency converter (4), which are arranged on the base (1), wherein the electric motor (3) is connected to the frequency converter (4) to control the operation of the fracturing pump (2); and a rotating shaft (31) of the electric motor (3) is connected to the fracturing pump (2) by means of a transmission assembly (9). The fracturing pump (2) comprises a lubrication system (8), a frame (23), and a crankshaft (24) and a crosshead (25), which are arranged in the frame (23), wherein the lubrication system (8) comprises a first pipe set (81) for lubricating a rolling bearing supported by the crankshaft (24), and a second pipe set (82) for lubricating the crosshead (25), with the first pipe set (81) and the second pipe set (82) being integrated in the frame (23). The fracturing machine can ensure a sufficient oil supply at a distal oil end, reduce joint connections between pipes, avoid oil leakage, and maintain an aesthetically pleasing appearance.

Description

A fracturing truck Technical Field

[0001] This invention relates to the field of fracturing truck technology, and particularly to a fracturing truck. Background Technology

[0002] With the continuous development of oilfield oil and gas production enhancement technologies, the number of fracturing equipment operating simultaneously during fracturing operations is increasing, and the duration of each operation is also lengthening. During operations, frequent replacement of vulnerable parts such as valves and packing glands of the fracturing pump is necessary. Sometimes, the position of the fracturing pump plunger obstructs the space for replacing these parts, making replacement impossible. In such cases, it is necessary to rotate the fracturing pump crankshaft to move the plunger to a suitable position for easy replacement. Currently, fracturing operations widely use a pry bar inserted into the universal joint of the drive shaft to move the drive shaft, thereby moving the fracturing pump crankshaft and plunger. However, to save space, a radiator and its support frame are usually installed above the universal joint, and the inspection cover of the universal joint must be opened to rotate the pump. Therefore, this method of rotating the pump is inconvenient and inefficient. In addition, most well site safety operation regulations do not allow for the maintenance of equipment while it is powered on, so the automatic pump described in the patent CN214330878U electric fracturing device automatic pump system cannot be used.

[0003] Furthermore, fracturing pump equipment is often subject to transportation restrictions due to its excessive size, making size reduction essential. Additionally, the fracturing pump is a key component in fracturing operations, bearing significant pressure, making lubrication of this critical component extremely important. Conventional lubrication lines installed outside the frame negatively impact aesthetics and increase the number of joints, thus increasing potential leakage points. Summary of the Invention

[0004] The purpose of this invention is to provide a fracturing truck that solves the problem that the existing lubrication system of fracturing trucks has insufficient oil supply at the far end because the lubricating oil enters from one end and then flows to the crosshead bearing and crankshaft bearing. At the same time, the existing lubrication system uses joints to connect the pipelines, which are prone to oil leakage and are also troublesome to assemble.

[0005] The present invention is implemented as follows: a fracturing truck includes a base and a fracturing pump, a motor, and a frequency converter placed on the base. The motor is connected to the frequency converter for controlling the operation of the fracturing pump. The motor shaft is connected to the fracturing pump through a transmission assembly. The fracturing pump includes a lubrication system, a frame, and a crankshaft and a crosshead placed within the frame. The lubrication system includes a first pipeline group for lubricating the crankshaft support rolling bearings and a second pipeline group for lubricating the crosshead. The first pipeline group and the second pipeline group are integrated within the frame.

[0006] Existing lubrication systems typically have lubricating oil entering from one end and then branching to the crosshead bearing and crankshaft bearing, resulting in insufficient oil supply at the distal end. Furthermore, existing lubrication systems use connectors between pipes, which are prone to leaks and cumbersome to assemble. In this invention, the lubrication system includes a first pipe assembly for lubricating the crankshaft support rolling bearings and a second pipe assembly for lubricating the crosshead bearings, reducing branches and ensuring sufficient oil supply at the distal end. Moreover, the first and second pipe assemblies are integrated into the frame, preventing aesthetic issues and increased connectors associated with increased piping, reducing leaks, and maintaining an aesthetically pleasing appearance.

[0007] A further technical solution of the present invention is: the second pipeline assembly includes a second lubrication chamber and a main pipe, the second lubrication chamber is located at both ends of the top of the frame, and the main pipe is used to connect the second lubrication chamber and the crosshead at both ends.

[0008] Multiple main pipes can be installed between the second lubrication chambers to ensure the flow rate of lubricating oil into the branch pipes, thereby ensuring the lubrication effect on the crosshead; moreover, the main pipes and the second lubrication chambers can be connected by welding to reduce leakage problems caused by joint connections.

[0009] A further technical solution of the present invention is: the main pipe includes a first main pipe, the first main pipe is connected to a plurality of branch pipes, the branch pipes are arranged between adjacent crossheads, and the branch pipes are used to lubricate the crosshead slide and the crosshead bearing.

[0010] The number of branch pipes is determined by the number of crossheads. The branch pipes do not take up extra space and are aesthetically pleasing.

[0011] A further technical solution of the present invention is: the main tube further includes a second main tube, and a plurality of branch tubes are connected to the second main tube, the branch tubes being used to connect the second main tube with the slide rail on the crosshead.

[0012] The main pipe used for lubricating the crosshead slide is different from the main pipe used for lubricating the crosshead slide and bearing. It ensures that the flow of lubricating oil to lubricate the crosshead is sufficient, thus ensuring proper lubrication of the crosshead.

[0013] A further technical solution of the present invention is: the first pipeline group includes a first lubrication cavity located at both ends of the top of the frame and a first channel group for connecting the two ends of the first lubrication cavity and the crankshaft, and the first channel group may be multiple.

[0014] Multiple first channel groups can be set between the first lubrication chambers to ensure the lubrication effect on the crankshaft support rolling bearings; moreover, the first channel groups and the first lubrication chambers can be connected by welding to reduce leakage problems caused by joint connections.

[0015] A further technical solution of the present invention is: the first channel group includes a first channel and a second channel, the second channel is opened in the frame, the first channel is used to connect the adjacent second channel, and the second channel is used to connect the first channel and the crankshaft support rolling bearing.

[0016] Lubricating oil enters from the first lubrication chamber at one end, then passes through the first and second channels to lubricate the crankshaft support rolling bearing. The first channel is a channel formed on the frame, and the second channel connects to the adjacent first channel. The first channel can be welded to the frame and communicates with the second channel, thus avoiding joint connections and preventing oil leakage in the first pipeline assembly. Specifically, the first channel communicates with the outer ring of the crankshaft bearing.

[0017] A further technical solution of the present invention is that the second channel includes two pathways forming a certain angle α, where 0° < α < 180°. The specific angle is set according to the frame thickness and actual working requirements.

[0018] One of the pathways connects to the first channel, and the other pathway connects to the crankshaft, thereby achieving the effect of lubricating the crankshaft and supporting the rolling bearing.

[0019] A further technical solution of the present invention is: a disc pump system is provided at one end of the motor near the frequency converter, and the disc pump system includes a disc pump shaft connected to the rotating shaft.

[0020] During long-term use of fracturing trucks, easily damaged components such as valves and packing in the fracturing pump need to be replaced. However, there are situations where the plunger of the fracturing pump blocks the parts that need to be replaced. To address this problem, the existing method is to pry the drive shaft at the universal joint of the drive shaft, thereby driving the crankshaft and plunger of the fracturing pump. However, as described in the background art, this method has problems of inconvenience, low efficiency, or safety issues. To address this technical problem, the present invention has sufficient space at the end of the motor near the frequency converter, allowing the disc pump system to be placed there without adding installation space. Specifically, the disc pump system includes a disc pump shaft, which is connected to the motor shaft. Therefore, rotating the disc pump shaft drives the motor shaft to rotate, thereby driving the crankshaft and plunger to move, solving the problem of the plunger blocking easily replaceable parts. In solving this technical problem, the present invention makes full use of existing space, providing sufficient space for operation. The connection between the disc pump shaft and the motor shaft facilitates operation, greatly improves work efficiency, and allows for manual rotation of the disc pump shaft, avoiding the safety issues of operating with electricity.

[0021] A further technical solution of the present invention is that the end of the disc pump shaft is located outside the motor and is equipped with a disc pump structure. When disc pump operation is required, it can be completed outside the fracturing truck, which provides ample external space and facilitates convenient and efficient operation.

[0022] A further technical solution of the present invention is: the disc pump structure includes a hole and / or a polygonal end. A tool is inserted into the hole, or a tool is fitted onto the polygonal end, and rotating the tool drives the disc pump shaft to rotate; the operation is simple and easy to implement.

[0023] A further technical solution of the present invention is: the motor includes a motor housing, a detachable protective cover is provided on the outside of the motor housing, one end of the disc pump shaft is connected to the rotating shaft, and one end of the disc pump shaft with a disc pump structure extends out of the motor housing and is placed inside the protective cover.

[0024] A disc pump shaft is installed at one end of the motor near the frequency converter. A seal is provided between the disc pump shaft and the motor housing to prevent external rainwater from entering the motor. A quick-removable protective cover is also provided on the motor housing for the safety of the motor shaft and disc pump shaft during operation. The disc pump shaft is equipped with a disc pump structure, which consists of a disc pump hole and / or a polygonal end. The shape of the hole and / or polygonal end is set according to actual working needs. When disc pumping, the motor is stopped, the protective cover is removed, and the disc pump structure is used for disc pumping operation. This disc pumping method offers ample space and simple operation, greatly improving work efficiency.

[0025] A further technical solution of the present invention is: a first sealing element is provided between the motor housing and the disc pump shaft. This further ensures the internal environment of the motor.

[0026] A further technical solution of the present invention is that the center line of the disc pump shaft coincides with or is parallel to the center line of the motor shaft. This makes the disc pump system easy to operate and requires less operating space.

[0027] A further technical solution of the present invention is: the fracturing pump includes a reciprocating plunger and a rod connected to the plunger, a rod sealing system is sleeved on the rod, the rod sealing system includes a rod mounting seat, and the rod mounting seat is provided with a receiving groove extending along the axial direction of the rod.

[0028] Considering the size of fracturing pumps, which would restrict transportation, this invention provides a receiving groove on the rod mounting base for installing the rod. In the same reciprocating stroke, the length of the rod can be shortened compared to the prior art, thus the length of the entire rod sealing system can also be shortened accordingly, effectively reducing the size of the fracturing pump.

[0029] A further technical solution of the present invention is that the opening of the receiving groove faces the plunger. In the same reciprocating stroke, the length of the rod in the present invention can be shortened compared to the prior art.

[0030] A further technical solution of the present invention is: the rod sealing system further includes a second sealing element and a pressure plate, the second sealing element is placed on the inner periphery of the rod mounting seat for sealing with the rod, and the pressure plate is placed on the side of the rod mounting seat for limiting the second sealing element.

[0031] The second seal is placed on the inner circumference of the rod mounting base, occupying little space in terms of length, further reducing the length of the rod. The rod sealing system of the present invention has a simple structure and small size.

[0032] The beneficial effects of the present invention are as follows: In the present invention, the lubrication system includes a first pipeline group for lubricating the crankshaft support rolling bearing and a second pipeline group for lubricating the crosshead, reducing the number of branches and ensuring the oil supply at the far end; at the same time, the first pipeline group and the second pipeline group of the present invention are integrated into the frame, so that the present invention not only does not cause aesthetic problems or an increase in joints due to the increase of pipelines, but also reduces the joint connections between pipelines, avoids oil leakage, and maintains the external appearance.

[0033] This invention provides sufficient space at the motor end near the frequency converter, allowing the disc pump system to be placed there without requiring additional installation space. Specifically, the disc pump system includes a disc pump shaft connected to the motor's rotating shaft. Therefore, rotating the disc pump shaft drives the rotating shaft, which in turn drives the crankshaft and plunger, solving the problem of the plunger blocking easily replaceable parts. In solving this technical problem, this invention makes full use of existing space, providing ample room for operation. The connection between the disc pump shaft and the motor's rotating shaft facilitates operation, greatly improving work efficiency. Furthermore, the safety issues associated with operating under power can be avoided by manually rotating the disc pump shaft.

[0034] Considering the size of fracturing pumps, which would restrict transportation, this invention provides a receiving groove on the rod mounting base for installing the rod. In the same reciprocating stroke, the length of the rod can be shortened compared to the prior art, thus the length of the entire rod sealing system can also be shortened accordingly, effectively reducing the size of the fracturing pump.

[0035] This invention aims to improve the efficiency and safety of oilfield oil and gas production enhancement operations. The disc pump system solves the problems of cumbersome and inefficient operation of traditional disc pumps, achieving highly efficient disc pump operation. In addition, this invention also provides a new rod seal and fracturing pump frame, simplifying the structure, reducing size, and improving lubrication reliability; the newly designed lubrication system, by adding a bypass, ensures the reliability of lubrication of power-end components, reduces leakage points, and improves overall aesthetics and assembly efficiency. Attached Figure Description

[0036] Figure 1 is a perspective view of a fracturing truck provided by the present invention;

[0037] Figure 2 is a structural schematic diagram of a fracturing truck provided by the present invention;

[0038] Figure 3 is a cross-sectional view of the disc pump system provided by the present invention;

[0039] Figure 4 is a schematic diagram of the position of the rod sealing system provided by the present invention in a fracturing truck;

[0040] Figure 5 is a schematic diagram of the structure of the rod sealing system provided by the present invention;

[0041] Figure 6 is a schematic diagram of the connection structure between the fracturing pump and the lubrication system provided by the present invention;

[0042] Figure 7 is a cross-sectional view of the connection between the fracturing pump and the second pipeline group provided by the present invention;

[0043] Figure 8 is a cross-sectional view of the connection between the fracturing pump and the second pipeline group provided by the present invention;

[0044] Figure 9 is a cross-sectional view of the connection between the fracturing pump and the first pipeline group provided by the present invention.

[0045] Reference numerals: 1. Base, 2. Fracturing pump, 21. Ramp rod, 22. Plunger, 23. Frame, 24. Crankshaft, 25. Crosshead, 3. Motor, 31. Shaft, 32. Motor housing, 33. Protective cover, 34. First seal, 4. Frequency converter, 5. Disc pump system, 51. Disc pump shaft, 52. Disc pump structure, 6. Ramp rod sealing system, 61. Ramp rod mounting seat, 62. Receiving groove, 63. Second seal, 64. Pressure plate, 65. Connecting bolt, 66. O-ring, 67. Screw, 7. Connecting part, 8. Lubrication system, 81. First pipeline assembly, 811. First lubrication chamber, 812. First channel, 813. Second channel, 82. Second pipeline assembly, 821. Second lubrication chamber, 822. Main pipe, 823. Branch pipe, 824. Sub-pipe, 9. Transmission assembly. Detailed Implementation

[0046] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0047] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0048] Example 1:

[0049] Figures 1-9 show a fracturing truck, including a base 1 and a fracturing pump 2, a motor 3, and a frequency converter 4 placed on the base 1. The motor 3 is connected to the frequency converter 4 to control the operation of the fracturing pump 2. The rotating shaft 31 of the motor 3 is connected to the fracturing pump 2 through a transmission assembly 9. The fracturing pump 2 includes a lubrication system 8, a frame 23, and a crankshaft 24 and a crosshead 25 placed in the frame 23. The lubrication system 8 includes a first pipeline group 81 for lubricating the rolling bearing supporting the crankshaft 24 and a second pipeline group 82 for lubricating the crosshead 25. The first pipeline group 81 and the second pipeline group 82 are integrated in the frame 23.

[0050] In existing lubrication systems, lubricating oil enters from one end and then branches to the crosshead bearing and crankshaft bearing, resulting in insufficient oil supply at the far end. Furthermore, existing lubrication systems use joints to connect the pipes, which are prone to leaks and are cumbersome to assemble. In this invention, the lubrication system 8 includes a first pipe assembly 81 for lubricating the crankshaft 24 supporting rolling bearings and a second pipe assembly 82 for lubricating the crosshead 25. This reduces branching, ensuring sufficient oil supply at the far end. Simultaneously, the first and second pipe assemblies 81 and 82 are integrated into the frame 23, reducing the number of joints between pipes, preventing leaks, and maintaining an aesthetically pleasing appearance.

[0051] In this embodiment, the second pipeline assembly 82 includes a second lubrication chamber 821 and a main pipe 822. The second lubrication chamber 821 is located at both ends of the top of the frame 23, and the main pipe 822 is used to connect the second lubrication chamber 821 and the crosshead 25 at both ends.

[0052] In this embodiment, the main pipe 822 includes a first main pipe, which is connected to a plurality of branch pipes 823. The branch pipes 823 are arranged between adjacent crossheads 25 and are used to lubricate the lower slide of the crosshead 25 and the crosshead 25 bearing.

[0053] In this embodiment, the branch pipe 823 is connected to the lower slide of the crosshead 25. Since the bearing of the crosshead 25 is connected to the lower slide, the branch pipe 823 can simultaneously lubricate the bearing of the crosshead 25 and the lower slide.

[0054] In this embodiment, the main pipe 822 further includes a second main pipe, on which a plurality of branch pipes 824 are connected. The branch pipes 824 are used to connect the second main pipe 822 with the slide rail on the crosshead 25.

[0055] In this embodiment, the branch pipe 824 is welded to the frame 23. One end of the branch pipe 824 can be welded and connected to the second main pipe, and the other end can be welded and connected to the upper slide of the crosshead 25, thus avoiding oil leakage caused by using joint connections. In this embodiment, lubricating oil enters from the second lubrication chamber 821 at one end, passes through the main pipe 822, and then enters the branch pipe 823 and the branch pipe 824. The lubricating oil flows out from the branch pipe 823 to lubricate the bearing and lower lubrication channel of the crosshead, and flows out from the branch pipe 824 to lubricate the upper slide of the crosshead, thereby completing the lubrication of the crosshead 25.

[0056] In this embodiment, the main tube 822 further includes a third main tube, which has no branches and is directly connected to the second lubrication cavities 821 at both ends.

[0057] In this embodiment, the first pipeline group 81 includes a first lubrication cavity 811 located at both ends of the top of the frame 23 and a first channel group for connecting the two ends of the first lubrication cavity 811 and the crankshaft 24. The first channel group may be multiple.

[0058] In this embodiment, the first channel group includes a first channel 812 and a second channel 813. The second channel 813 is opened in the frame 23. The first channel 812 is used to connect the adjacent second channel 813, and the second channel 813 is used to connect the first channel 812 and the crankshaft 24 support rolling bearing.

[0059] Lubricating oil enters from the first lubrication chamber 811 at one end, then passes through the first channel 812 and the second channel 813 to lubricate the crankshaft 24 supporting rolling bearing. The first channel 812 is a channel formed on the frame 23, and the second channel 813 connects to the adjacent first channel 812. The first channel 812 can be welded to the frame 23 and communicates with the second channel 813. Therefore, the connection of the first pipeline 81 avoids joint connections and prevents oil leakage. Specifically, the first channel 812 communicates with the outer ring of the bearing on the crankshaft 24.

[0060] In this embodiment, the first channel 812 extends along the straight line where the first lubrication cavities 811 at both ends are located.

[0061] In this embodiment, the second channels 813 at both ends are used to connect the first lubrication cavity 811, the first channel 812 and the crankshaft 24 supporting rolling bearing, and adjacent second channels 813 are connected through the first channel 812.

[0062] In this embodiment, the second channel 813 includes two paths that form a certain angle α with each other, where 0° < α < 180°. The specific angle is set according to the frame thickness and actual working needs.

[0063] In this embodiment, the angle α between the two passages of the second channel 813 is 90°. One passage is connected to the first channel 812, and the other passage is used to connect to the crankshaft 24 support rolling bearing. This design occupies little space and is easy to manufacture.

[0064] In this embodiment, the two paths of the second channel 813 have a T-shaped structure;

[0065] In another embodiment, the two passages of the second channel 813 are cross-shaped; when the two passages of the second channel 813 are cross-shaped, they form a through hole with the top of the frame. The through hole is an observation hole, which allows for observation of the crankshaft's lubrication status at any time, so that maintenance can be carried out in a timely manner.

[0066] This invention provides a novel fracturing pump frame that ensures reliable lubrication of the power-end components. Specifically, the crankshaft 24 and crosshead 25 employ two sets of lubrication pipelines, solving the problem of insufficient oil supply at the far end due to oil inlet at one end. The lubrication pipelines at the power end are welded together with the frame 23, reducing joint connections and thus reducing leakage points. This also reduces assembly workload. The structure is simple, with the entire lubrication system connected by steel pipes inside the frame 23, improving the overall aesthetics.

[0067] In this embodiment, the main pipe 822 includes three pipes. The first main pipe is connected to the branch pipe 823 for lubricating the lower lubrication channel and bearing of the crosshead 25. The second main pipe is connected to the branch pipe 824 for lubricating the upper slide of the crosshead 25. The third main pipe has no branches but is directly connected to the second lubrication chambers 821 at both ends, wherein the second lubrication chambers 821 are symmetrically arranged at both ends of the frame 23. Lubricating oil flows in from the second lubrication chamber 821 at one end, enters the three main pipes 822 respectively, then enters the cavity of the upper slide, flows along the second main pipe 822, enters the lower slide and the crosshead bearing, and finally flows out from the second lubrication chamber 821 at the other end of the frame 23.

[0068] In this embodiment, in the first pipeline group 81, the first lubrication chamber 811 is symmetrically arranged at both ends of the frame 23, and the second channel 813 lubricates the rolling bearing of the crankshaft 24; the lubricating oil flows in from the first lubrication chamber 811 at one end, lubricates the crankshaft 24 through the first channel 812 and the second channel 813, and finally flows out from the first lubrication chamber 811 at the other end.

[0069] In this embodiment, a disc pump system 5 is provided at one end of the motor 3 near the frequency converter 4. The disc pump system 5 includes a disc pump shaft 51 connected to the rotating shaft 31.

[0070] This patent also applies to skid-mounted fracturing pump units.

[0071] In this embodiment, the fracturing truck includes a fracturing pump 2, a motor 3, a transmission assembly 9, a control system, and a frequency converter 4. The frequency converter 4 controls the speed of the motor 3 to achieve efficient pump rotation operation. The transmission assembly 9 is provided between the fracturing pump 2 and the motor 3, and the motor 2 drives the fracturing pump 2 to operate through the transmission assembly 9. The control system is electrically connected to the frequency converter 4, and the frequency converter 4 is electrically connected to the motor 3. The frequency converter 4 is used to control the speed of the motor 3.

[0072] In this embodiment, the end of the disc pump shaft 51 is located outside the motor 3 and is provided with a disc pump structure 52.

[0073] When pump operation is required, it can be done from outside the fracturing truck, which offers ample external space and makes operation convenient and efficient.

[0074] In this embodiment, the disc pump structure 52 is a hole; the hole can be triangular, square, pentagonal, or hexagonal, etc., and can be set according to actual working needs. By inserting a tool into the hole and rotating the tool, the disc pump shaft can be driven to rotate, making the operation simple and easy to implement.

[0075] In another embodiment, the disc pump structure 5 has a polygonal end, which can be a triangle, quadrilateral, pentagon, hexagon, or other polygons. A tool is fitted onto the polygonal end, and rotating the tool drives the disc pump shaft to rotate, making the operation simple and easy to implement.

[0076] In this embodiment, the motor 3 includes a motor housing 32, and a detachable protective cover 33 is provided on the outside of the motor housing 32. One end of the disc pump shaft 51 is connected to the rotating shaft 31, and one end of the disc pump shaft 51, which is provided with a disc pump structure 52, extends out of the motor housing 32 and is placed inside the protective cover 33.

[0077] A pump shaft 51 is installed at one end of the motor 3 near the frequency converter 4. A seal is provided between the pump shaft 51 and the motor housing 32 to prevent external rainwater from entering the motor 3. The motor housing 32 is also equipped with a quick-release protective cover 33 for the safety protection of the motor shaft and the pump shaft 51 when the motor 3 is working. The pump shaft 51 is provided with a tool insertion hole. When pumping, the motor is stopped, the protective cover 33 is removed, and a pry bar or other rod-shaped tool is inserted into the tool insertion hole to perform the pumping operation. The pumping space here is open and the operation is simple, which can greatly improve work efficiency.

[0078] In this embodiment, a first seal 34 is provided between the motor housing 32 and the disc pump shaft 51 to further ensure the internal environment of the motor.

[0079] In this embodiment, the center line of the disc pump shaft 51 coincides with the center line of the motor shaft 3. This makes the disc pump system easy to operate and requires less operating space.

[0080] In another embodiment, the disc pump shaft 51 is parallel to the center line of the motor 3's rotating shaft. Without considering space occupation and operability, the disc pump shaft 51 and the motor 3's rotating shaft can also form a certain angle.

[0081] In this embodiment, the fracturing pump 2 includes a reciprocating plunger 22 and a rod 21 connected to the plunger 22. A rod sealing system 6 is sleeved on the rod 21. The rod sealing system 6 includes a rod mounting seat 61. The rod mounting seat 61 is provided with a receiving groove 62 extending axially along the rod 21.

[0082] Considering the size of the fracturing pump, which would restrict transportation, the present invention provides a receiving groove on the rod mounting base 61 for mounting the rod 21. In the same reciprocating stroke, the length of the rod 21 can be shortened compared to the prior art. Therefore, the length of the entire rod sealing system 6 can also be shortened simultaneously, thus effectively reducing the size of the fracturing pump 2.

[0083] In the prior art, the mounting base for mounting the rod in the rod sealing system is plate-shaped, and the connecting part 7 between the rod 21 and the plunger 22 is larger than the rod 21. When the rod 21 moves away from the plunger 22, the connecting part 7 interferes with the plate-shaped mounting base, and the stroke of the rod 21 is limited by the connecting part 7. In this application, the rod mounting base 61 is provided with a receiving groove 62 arranged along the axial direction of the rod 21. The receiving groove 62 can be used to accommodate the connecting part 7. Therefore, for the same stroke of the rod 21, the rod 21 of the present invention can be made shorter.

[0084] In this embodiment, the opening of the receiving groove 62 faces the plunger 22. During the same reciprocating stroke, the length of the rod in this invention can be shortened compared to existing technologies.

[0085] In this embodiment, the rod sealing system 6 further includes a second sealing element 63 and a pressure plate 64. The second sealing element 63 is placed on the inner periphery of the rod mounting base 61 for sealing with the rod 21, and the pressure plate 64 is placed on the side of the rod mounting base 61 for limiting the second sealing element 63.

[0086] The second seal 63 is placed on the inner circumference of the rod mounting base 61, occupying little space in terms of length, further reducing the length of the rod 21. The rod sealing system 6 of the present invention has a simple structure and small size.

[0087] In this embodiment, the rod mounting base 61 is connected to the pump support frame via connecting bolts 65. An O-ring 66 is provided on the rod mounting base 61, and the rod mounting base 61 is fixed to the pressure plate 64 by screws 67. The rod sealing system is connected to the support frame via connecting bolts 65. Since the connection between the rod 21 and the plunger 22 can move into the receiving groove 62, the rod 21 of this invention can be shortened for the same reciprocating stroke, reducing the overall size of the fracturing pump 2.

[0088] In this embodiment, the cross-section of the connection between the rod mounting base 61 and the pump support frame is L-shaped, and an O-ring 66 is provided at the connection between the rod mounting base 61 and the pump support frame; the cross-section of the connection between the rod mounting base 61 and the second sealing member 63 is L-shaped.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fracturing truck, comprising a base (1) and a fracturing pump (2), a motor (3), and a frequency converter (4) disposed on the base (1), wherein the motor (3) is connected to the frequency converter (4) for controlling the operation of the fracturing pump (2); the rotating shaft (31) of the motor (3) is connected to the fracturing pump (2) via a transmission assembly (9), characterized in that: The fracturing pump (2) includes a lubrication system (8), a frame (23), and a crankshaft (24) and a crosshead (25) placed in the frame (23). The lubrication system (8) includes a first pipeline assembly (81) for lubricating the rolling bearings supporting the crankshaft (24) and a second pipeline assembly (82) for lubricating the crosshead (25). The first pipeline assembly (81) and the second pipeline assembly (82) are integrated in the frame (23).

2. The fracturing truck according to claim 1, characterized in that: The second pipeline assembly (82) includes a second lubrication chamber (821) and a main pipe (822). The second lubrication chamber (821) is located at both ends of the top of the frame (23), and the main pipe (822) is used to connect the second lubrication chamber (821) at both ends and the crosshead (25).

3. A fracturing truck according to claim 2, characterized in that: The main tube (822) includes a first main tube connected to a plurality of branch tubes (823), the branch tubes (823) being arranged between adjacent crossheads (25), the branch tubes (823) being used to lubricate the lower slide of the crosshead (25) and the crosshead (25) bearing.

4. A fracturing truck according to claim 3, characterized in that: The main tube (822) also includes a second main tube, on which multiple branch tubes (824) are connected. The branch tubes (824) are used to connect the second main tube (822) with the slide rail on the crosshead (25).

5. A fracturing truck as claimed in any one of claims 1 to 4, characterized in that: The first pipeline assembly (81) includes a first lubrication cavity (811) located at both ends of the top of the frame (23) and a first channel assembly for connecting the two ends of the first lubrication cavity (811) and the crankshaft (24). The first channel assembly may be multiple.

6. A fracturing truck as defined in claim 5, wherein: The first channel group includes a first channel (812) and a second channel (813). The second channel (813) is opened in the frame (23). The first channel (812) is used to connect the adjacent second channel (813). The second channel (813) is used to connect the first channel (812) and the crankshaft (24) support rolling bearing.

7. A fracturing truck as defined in claim 6, wherein: The second channel (813) includes two pathways forming an angle α, where 0° < α < 180°.

8. A fracturing truck as claimed in any one of claims 1-4, characterized in that: The motor (3) is provided with a disc pump system (5) at one end near the frequency converter (4), and the disc pump system (5) includes a disc pump shaft (51) connected to the rotating shaft (31).

9. A fracturing truck according to claim 8, characterized in that: The end of the disc pump shaft (51) is located outside the motor (3) and is provided with a disc pump structure (52).

10. A fracturing truck according to claim 9, characterized in that: The disc pump structure (52) includes holes and / or polygonal ends.

11. A fracturing truck according to claim 9, characterized in that: The motor (3) includes a motor housing (32), and a detachable protective cover (33) is provided on the outside of the motor housing (32). One end of the disc pump shaft (51) is connected to the rotating shaft (31), and one end of the disc pump shaft (51) with a disc pump structure (52) extends out of the motor housing (32) and is placed inside the protective cover (33).

12. A fracturing truck according to claim 8, characterized in that: The pump shaft (51) coincides with / is parallel to the center line of the motor shaft (3).

13. A fracturing truck according to any one of claims 1-4, characterized in that: The fracturing pump (2) includes a reciprocating plunger (22) and a rod (21) connected to the plunger (22). A rod sealing system (6) is fitted on the rod (21). The rod sealing system (6) includes a rod mounting seat (61). The rod mounting seat (61) is provided with a receiving groove (62) extending axially along the rod (21).

14. A fracturing truck according to claim 13, characterized in that: The opening of the receiving groove (62) faces the plunger (22).

15. A fracturing truck according to claim 13, characterized in that: The rod sealing system (6) further includes a second seal (63) and a pressure plate (64). The second seal (63) is placed on the inner periphery of the rod mounting base (61) for sealing with the rod (21), and the pressure plate (64) is placed on the side of the rod mounting base (61) for limiting the second seal (63).

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