Fracturing plunger pump

Abstract

The utility model relates to the technical field of plunger pumps, and discloses a fracturing plunger pump, a power end assembly of the fracturing plunger pump comprises a power end shell, a connecting rod body crosshead assembly and a crankshaft assembly, one side of the connecting rod body crosshead assembly is connected with a crankshaft of the crankshaft assembly, and the other side of the connecting rod body crosshead assembly is installed in a crosshead cavity of the power end shell; the power end shell comprises a plurality of crosshead cylinder sleeves, a plurality of crankshaft bearing pedestals and a plurality of vertical plates, the crankshaft bearing pedestals are installed on the vertical plates in a one-to-one correspondence mode, and a first containing cavity used for containing a crank throw of a crankshaft is formed between every two adjacent crankshaft bearing pedestals. A second containing cavity used for containing the crosshead cylinder sleeves is formed between every two adjacent vertical plates, each crosshead cylinder sleeve is provided with a crosshead cavity, and the crosshead cavities communicate with the first containing cavities. The reliability of the plunger pump can be improved through the vertical plates of the power end shell, the plunger pump is simple, reasonable and compact in overall structure, and light weight of the plunger pump is achieved.

Description

Technical Field

[0001] This utility model relates to the field of plunger pump technology, specifically to a fracturing plunger pump. Background Technology

[0002] As oilfield extraction operations trend towards higher pressure and larger displacement, the operational capacity of fracturing equipment used in oilfield extraction is increasing. Currently, the problem of excessive weight of fracturing and cementing equipment used in oilfield extraction is becoming increasingly prominent, and the overall structural strength and reliability of fracturing equipment are insufficient. Utility Model Content

[0003] The present invention aims to at least solve the technical problems of excessive weight, insufficient structural strength, and low reliability of fracturing equipment in the prior art.

[0004] To solve the above-mentioned technical problems, this utility model provides a fracturing plunger pump, including a power end assembly, a hydraulic end assembly, and a reduction mechanism assembly. The power end assembly and an external power source are respectively connected to the reduction mechanism assembly, and the power end assembly is connected to the hydraulic end assembly.

[0005] The power end assembly includes a power end housing, a connecting rod crosshead assembly, and a crankshaft assembly. One side of the connecting rod crosshead assembly is connected to the crankshaft of the crankshaft assembly, and the other side of the connecting rod crosshead assembly is installed in the crosshead cavity of the power end housing.

[0006] The power end housing includes multiple crosshead cylinder liners, multiple crankshaft bearing seats, and multiple vertical plates. The multiple crankshaft bearing seats are mounted one-to-one on the multiple vertical plates. A first receiving cavity for accommodating the crankshaft crank is formed between two adjacent crankshaft bearing seats. A second receiving cavity for accommodating the crosshead cylinder liners is formed between two adjacent vertical plates. Each crosshead cylinder liner has a crosshead cavity, and the crosshead cavity communicates with the first receiving cavity.

[0007] In some embodiments, the crosshead cylinder liner is welded to the vertical plate, and the weld between the crosshead cylinder liner and the vertical plate is along the axial direction of the force applied at the hydraulic end.

[0008] In some embodiments, the power end housing further includes an upper cover plate, a lower cover plate, a front end plate, and a rear cover plate disposed on the upper side, lower side, front end, and rear end of the vertical plate. The upper cover plate, lower cover plate, front end plate, and rear cover plate are respectively welded to the vertical plate. The weld between the upper cover plate and the vertical plate and the weld between the lower cover plate and the vertical plate are parallel to the axial direction of the force applied by the hydraulic end. The upper cover plate and the lower cover plate are respectively connected to the front end plate through a tenon plate structure.

[0009] In some embodiments, the front ends of the upper cover plate and the lower cover plate are respectively provided with falcon heads, the front end plate is provided with falcon holes that mate with the falcon heads, and the falcon heads and / or the falcon holes are provided with multiple falcon welding bevels.

[0010] In some embodiments, the upper cover plate has an upper observation window, the lower cover plate has a lower observation window, the front end plate has a front observation window, and the rear cover plate has a rear observation window. The upper observation window and the lower observation window are torque assembly holes.

[0011] In some embodiments, the power end assembly further includes a main oil pipe assembly detachably mounted on the power end housing.

[0012] The main oil pipe assembly includes a main oil pipe and a transition joint. The main oil pipe is fixed to the power end housing via the transition joint, and the end of the main oil pipe is provided with a thread for connection to the transition joint; and / or

[0013] A sealing ring is provided between the transition joint and the power end housing; a split flange is provided on the outside of the transition joint; and the split flange is fixed to the transition joint; and / or

[0014] The power end housing is provided with a transition joint mounting surface.

[0015] In some embodiments, the connecting rod crosshead assembly includes a tie rod, a crosshead, a connecting rod body, and a connecting rod body seat connected in sequence. The crosshead is connected to the connecting rod body via a cross pin. A small end bearing of the crosshead is provided between the crosshead and the connecting rod body. The connecting rod body seat is connected to the crankshaft crank. A large end bearing of the connecting rod is provided between the connecting rod body seat and the crankshaft.

[0016] The ratio of the crank radius of the crankshaft to the connecting rod length of the connecting rod body is 0.19 to 0.25.

[0017] In some embodiments, the crankshaft assembly includes a crankshaft, a crankshaft moving bearing, a crankshaft fixed bearing, and a crankshaft connecting flange. The crankshaft is connected to the reduction gear assembly via the crankshaft connecting flange. The crankshaft moving bearing and the crankshaft fixed bearing are mounted in the crankshaft bearing housing and are respectively connected to the crankshaft; and / or

[0018] The crankshaft is provided with weight-reducing grooves at both axial ends.

[0019] In some embodiments, the reduction gear assembly includes a drive flange, a herringbone gear structure, and a drive connecting shaft. One end of the drive flange is connected to the herringbone gear structure, and the other end of the drive flange is connected to the external power source. One end of the drive connecting shaft is connected to the herringbone gear structure, and the other end of the drive connecting shaft is connected to the crankshaft connecting flange; and / or

[0020] The herringbone gear structure includes a gearbox housing and a large gear bearing, a large gear, a small gear bearing, and a small gear installed inside the gearbox housing. The large gear and the small gear mesh. The gearbox housing is provided with a large gear bearing seat and a small gear bearing seat. The large gear bearing is installed inside the large gear bearing seat and is axially connected to the large gear. The small gear bearing is installed inside the small gear bearing seat and is axially connected to the small gear.

[0021] In some embodiments, the fracturing plunger pump further includes a lubrication system assembly, the lubrication system assembly including an oil collection block having a lubrication oil inlet and a plurality of lubrication oil outlets, the lubrication system assembly further including a plurality of lubrication points disposed on the power end assembly, the plurality of lubrication points being connected to the plurality of lubrication oil outlets; and / or

[0022] The plurality of lubrication points include at least one of the following: pinion shaft bearing lubrication point, gear bearing lubrication point, gear pair meshing position lubrication point, crankshaft bearing lubrication point, crosshead lubrication point, crankshaft lubrication input point, and connecting rod big end bearing lubrication point; and / or

[0023] The upper cover plate and the lower cover plate are respectively provided with oil return ports.

[0024] The fracturing plunger pump provided in this embodiment of the utility model is configured to include a power end assembly, a hydraulic end assembly, and a reduction mechanism assembly. The power end assembly and an external power source are respectively connected to the reduction mechanism assembly. The power end assembly is connected to the hydraulic end assembly. The power end assembly includes a power end housing, a connecting rod crosshead assembly, and a crankshaft assembly. One side of the connecting rod crosshead assembly is connected to the crankshaft of the crankshaft assembly, and the other side of the connecting rod crosshead assembly is installed in the crosshead cavity of the power end housing. The power end housing includes multiple crosshead cylinder liners, multiple crankshaft bearing seats, and multiple vertical plates. The multiple crankshaft bearing seats are installed one-to-one on the multiple vertical plates. A space is formed between two adjacent crankshaft bearing seats to accommodate the crankshaft in the crankshaft assembly. The first receiving cavity of the crankshaft has a second receiving cavity formed between two adjacent vertical plates for accommodating the crosshead cylinder liner. Each crosshead cylinder liner has a crosshead cavity, which communicates with the first receiving cavity. Multiple vertical plates ensure the overall reliability of the power end housing structure, improve the reliability of the fracturing plunger pump, and facilitate the disassembly and maintenance of the connecting rod crosshead assembly and crankshaft assembly. The overall structure of the fracturing plunger pump is simple, reasonable, and compact. The design of multiple vertical plates and crankshaft bearing seats can shorten the cylinder spacing, shorten the stroke, and reduce the reduction ratio, achieving a lightweight design for the fracturing plunger pump. In addition, this utility model can be configured with a corresponding number of crosshead cylinder liners, multiple crankshaft bearing seats, and multiple vertical plates according to different usage needs, and it is easy to process and has a wide range of applications. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the fracturing plunger pump according to an embodiment of the present invention;

[0027] Figure 2 This is a front sectional view of the fracturing plunger pump according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the power end housing according to an embodiment of the present utility model;

[0029] Figure 4 This is a schematic diagram of the power end housing from another direction according to an embodiment of the present utility model;

[0030] Figure 5This is a structural schematic diagram of the power end housing in another direction of an embodiment of the present utility model (including the exploded structure of the main oil pipe assembly);

[0031] Figure 6 This is an exploded structural diagram of the power end housing according to an embodiment of the present utility model;

[0032] Figure 7 This is a schematic diagram of the structure of the upper cover plate and the lower cover plate according to an embodiment of the present utility model;

[0033] Figure 8 This is a schematic diagram of the assembly structure of the upper cover plate and the front end plate according to an embodiment of the present utility model;

[0034] Figure 9 This is a schematic diagram of the connecting rod crosshead assembly according to an embodiment of the present utility model;

[0035] Figure 10 This is a schematic diagram of the crankshaft structure according to an embodiment of the present utility model;

[0036] Figure 11 This is a schematic diagram of the crankshaft in another direction according to an embodiment of the present invention;

[0037] Figure 12 This is an exploded structural diagram of the deceleration mechanism assembly according to an embodiment of the present utility model;

[0038] Figure 13 This is a cross-sectional view of the hydraulic end assembly according to an embodiment of the present utility model;

[0039] Figure 14 This is a first structural schematic diagram of the lubrication system assembly according to an embodiment of the present utility model;

[0040] Figure 15 This is a second structural schematic diagram of the lubrication system assembly according to an embodiment of the present utility model;

[0041] Figure 16 This is a third structural schematic diagram of the lubrication system assembly according to an embodiment of the present utility model;

[0042] Figure 17 This is a schematic diagram of the crankshaft lubrication oil passage according to an embodiment of the present invention;

[0043] Figure 18 This is a schematic diagram of the oil collecting block according to an embodiment of the present invention;

[0044] Figure 19 This is another structural schematic diagram of the oil collecting block according to an embodiment of the present utility model;

[0045] Figure 20 This is a top view of the fracturing plunger pump according to an embodiment of the present invention;

[0046] Figure 21 This is a schematic diagram of the torque assembly hole in an embodiment of the present invention. Figure 20 (Part A in the middle circle);

[0047] Figure 22 This is a bottom view of the fracturing plunger pump according to an embodiment of the present invention;

[0048] Figure 23 This is a schematic diagram of the structure of the oil return port according to an embodiment of the present invention. Figure 22 (Part B in the middle circle);

[0049] Figure 24 This is another structural schematic diagram of the oil return port according to an embodiment of the present utility model.

[0050] Figure label:

[0051] 1-Power end assembly, 11-Power end housing, 111-Crosshead cylinder liner, 1111-Crosshead cavity, 112-Crankshaft bearing housing, 113-Vertical plate, 1141-First receiving cavity, 1142-Second receiving cavity, 115-Upper cover plate, 1151-Upper observation window, 116-Lower cover plate, 1161-Lower observation window, 117-Front end plate, 1171-Front observation window, 118-Rear cover plate, 1181-Rear observation window, 1191-Finger head, 1192-Finger hole, 1193-Finger welding bevel; 1101-Front reinforcing plate, 1102-Crosshead cylinder liner support plate, 1103-Base, 1104-Lifting hole, 1105 - Hydraulic end connection bolt fixing hole, 1106- Tie rod oil seal seat fixing hole, 1107- Base fixing hole, 12- Connecting rod body crosshead assembly, 121- Tie rod, 122- Crosshead, 123- Connecting rod body, 124- Connecting rod body seat, 125- Cross pin head, 126- Crosshead small end bearing, 127- Connecting rod large end bearing, 13- Crankshaft assembly, 131- Crankshaft, 1311- Crank crank, 1312- Weight reduction groove, 14- Main oil pipe assembly, 141- Main oil pipe, 142- Transition joint, 143- Sealing ring, 144- Split flange, 145- Fixing bolt, 146- Spring washer, 147- Bolt mounting hole, 148- Transition joint mounting surface;

[0052] 2-Hydraulic end assembly, 21-Valve box, 22-Plunger, 23-Valve body assembly, 24-Valve seat assembly, 25-Clamp assembly, 261-Packing assembly, 262-Packing cap, 263-Anti-loosening handle, 271-Valve spring, 272-Valve spring seat, 273-Valve spring seat sleeve, 281-Discharge cap, 282-Discharge gland, 283-Discharge gland seal;

[0053] 3-Reduction gear assembly, 31-Drive flange, 32-Herringbone tooth structure, 321-Large gear bearing, 322-Large gear, 323-Pinner gear bearing, 324-Pinner gear, 325-Large gear bearing housing, 326-Pinner gear bearing housing, 3271-First housing, 3272-Second housing, 33-Drive connecting shaft;

[0054] 4-Lubrication system assembly, 41-Oil collection block, 411-Lubricating oil interface, 412-Lubricating oil outlet, 421-Pinary gear shaft bearing lubrication point, 422-Large gear bearing lubrication point, 423-Gear pair meshing position lubrication point, 424-Crankshaft bearing lubrication point, 425-Crosshead lubrication point, 426-Crankshaft lubrication input point, 427-Connecting rod big end bearing lubrication point, 43-Oil return port, 431-Snap-fit ​​part. Detailed Implementation

[0055] Various embodiments and features of this utility model are described herein with reference to the accompanying drawings.

[0056] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this invention will be apparent to those skilled in the art.

[0057] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present invention and, together with the general description of the present invention given above and the detailed description of the embodiments given below, serve to explain the principles of the present invention.

[0058] These and other features of the present invention will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0059] It should also be understood that although the present invention has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of the present invention, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0060] The above and other aspects, features and advantages of the present invention will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0061] Specific embodiments of the present invention will now be described with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present invention, which may be implemented in various ways. Well-known and / or repeated functions and structures have not been described in detail to avoid unnecessary or redundant details that could obscure the present invention. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use the present invention in a variety of substantially any suitable detailed structures.

[0062] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to the present invention.

[0063] Figures 1 to 24 A schematic diagram of the fracturing plunger pump provided in an embodiment of this utility model is shown. Figures 1 to 24 As shown in the figure, this utility model embodiment provides a fracturing plunger pump, including a power end assembly 1, a hydraulic end assembly 2, and a reduction mechanism assembly 3. The power end assembly 1 and an external power source are respectively connected to the reduction mechanism assembly 3, and the power end assembly 1 is connected to the hydraulic end assembly 2.

[0064] The power end assembly 1 includes a power end housing 11, a connecting rod body crosshead assembly 12, and a crankshaft assembly 13. One side of the connecting rod body crosshead assembly 12 is connected to the crankshaft 131 of the crankshaft assembly 13, and the other side of the connecting rod body crosshead assembly 12 is installed in the crosshead cavity 1111 of the power end housing 11.

[0065] The power end housing 11 includes a plurality of crosshead cylinder liners 111, a plurality of crankshaft bearing seats 112, and a plurality of vertical plates 113. The plurality of crankshaft bearing seats 112 are mounted one-to-one on the plurality of vertical plates 113. A first receiving cavity 1141 for accommodating the crankshaft 1311 is formed between two adjacent crankshaft bearing seats 112. A second receiving cavity 1142 for accommodating the crosshead cylinder liners 111 is formed between two adjacent vertical plates 113. Each crosshead cylinder liner 111 has a crosshead cavity 1111, and the crosshead cavity 1111 communicates with the first receiving cavity 1141.

[0066] Specifically, the drive flange 31 in the reduction mechanism assembly 3 is connected to an external power source. The external power source transmits torque to the reduction mechanism assembly 3 through the drive flange 31. The reduction mechanism assembly 3 reduces the speed and increases the torque transmitted by the external power source before transmitting it to the crankshaft 131 of the crankshaft assembly 13 in the power end assembly 1. The crankshaft 131 and the connecting rod crosshead assembly 12 form a crank-connecting rod mechanism. The rotational motion of the crankshaft 131 can be converted into the reciprocating motion of the connecting rod crosshead assembly 12. The pull rod 121 in the connecting rod crosshead assembly 12 is connected to the plunger in the hydraulic end assembly 2. The reciprocating motion of the connecting rod crosshead assembly 12 can drive the plunger in the hydraulic end assembly 2 to reciprocate. The reciprocating motion of the plunger can drive the valve body and valve seat structure in the hydraulic end assembly 2 to open and close regularly, thereby realizing the pumping effect of high-pressure liquid.

[0067] The crankshaft assembly 13 in the power end assembly 1 is mounted on the crankshaft bearing seat 112 in the power end housing 11. The connecting rod big end side of the connecting rod body crosshead assembly 12 is mounted on the crankshaft crank 1311 of the crankshaft assembly 13. The crosshead 122 in the connecting rod body crosshead assembly 12 is mounted in the crosshead cavity 1111 of the power end housing 11. The rotational motion of the crankshaft assembly 13 can drive the connecting rod body crosshead assembly 12 to reciprocate.

[0068] For example, in this embodiment, six crankshaft bearing seats 112 and six upright plates 113 are provided. Each upright plate 113 is provided with crankshaft bearing seat mounting holes. The six crankshaft bearing seats 112 are welded together with the six upright plates 113 respectively. Each crankshaft bearing seat 112 adopts a circumferential butt weld structure on both sides of the plate body of each upright plate 113. The circumferential butt weld has a large welding area and a regular weld geometry, which can ensure the temperature and uniformity of the welding strength, resulting in high welding strength and ensuring the force between the crankshaft bearing seat 112 and the upright plate 113.

[0069] like Figure 10 and Figure 11 As shown, the crankshaft 131 passes through and connects to each crankshaft bearing housing 112 along its axial direction. The crankshaft 131 has multiple cranks 1311, each crank 1311 located within a first receiving cavity 1141. The crankshaft 131 is composed of several cranks 1311, with the left and right crank arms and the left and right main journals forming one crank 1311. Figure 3 and Figure 6 As shown, the six vertical plates 113 form five first receiving cavities 1141 and five second receiving cavities 1142. The number of cranks 1311 is five, and the number of crosshead cylinder liners 111 is also five. The crosshead cavity 1111 inside the crosshead cylinder liner 111 is used to support the connecting rod crosshead assembly 12, realizing the reciprocating motion of the connecting rod crosshead assembly 12 within the crosshead cavity 1111.

[0070] The fracturing plunger pump provided in this embodiment configures the power end assembly 1 as including a power end housing 11, a connecting rod body crosshead assembly 12, and a crankshaft assembly 13. The power end housing 11 includes multiple crosshead cylinder liners 111, multiple crankshaft bearing seats 112, and multiple vertical plates 113. The multiple crankshaft bearing seats 112 are mounted one-to-one on the multiple vertical plates 113. A first receiving cavity 1141 for accommodating the crankshaft crank in the crankshaft assembly 13 is formed between two adjacent crankshaft bearing seats 112. A second receiving cavity 1141 for accommodating the crosshead cylinder liners 111 is formed between two adjacent vertical plates 113. The two receiving cavities 1142, each of the crosshead cylinder liners 111 having a crosshead cavity 1111, the crosshead cavity 1111 communicating with the first receiving cavity 1141, can ensure the overall reliability of the power end housing 11 structure through multiple vertical plates 113, improve the reliability of the fracturing plunger pump, and facilitate the disassembly and maintenance of the connecting rod body crosshead assembly 12 and crankshaft assembly 13; the overall structure of the fracturing plunger pump is simple, reasonable, and compact, and the design of multiple vertical plates 113 and crankshaft bearing seats 112 can shorten the cylinder spacing, shorten the stroke, and reduce the reduction ratio, achieving a lightweight design of the fracturing plunger pump. In addition, this utility model can be configured with a corresponding number of crosshead cylinder liners 111, multiple crankshaft bearing seats 112, and multiple vertical plates 113 according to different usage needs, and is easy to process and has a wide range of applications.

[0071] The fracturing plunger pump provided in this embodiment can be used for cementing and fracturing operations in oilfield development, as well as for fracturing operations in coalbed methane extraction, etc.

[0072] In some embodiments, the crosshead cylinder liner 111 is welded to the vertical plate 113, and the weld between the crosshead cylinder liner 111 and the vertical plate 113 is along the axial direction of the force applied at the hydraulic end.

[0073] Welded seams are generally classified into two types: connecting welds and working welds. Connecting welds are those associated with the connected components, parallel to the direction of force, and transmit very small loads. Working welds are those on the welded structure that are connected in series with the connecting elements, bearing the entire load; if they break, the structure immediately fails. The crosshead cylinder liner 111 is welded to the vertical plate 113 using a connecting weld, which can bear small loads and has good load-bearing capacity. Meanwhile, the circumferential butt weld structure used between the crankshaft bearing housing 112 and the vertical plate 113 increases the load-bearing capacity of the working weld and improves the reliability of the welded load. In this embodiment, the power end housing 11 adopts a high-strength welded structure. Compared to cast housings, thinner steel plates can be used to weld the entire housing, resulting in controllable and lightweight weight. This also helps avoid the problems of poor weld load-bearing capacity and easy welding cracking found in ordinary welded housings.

[0074] In some embodiments, the power end housing 11 further includes an upper cover plate 115, a lower cover plate 116, a front end plate 117, and a rear cover plate 118 disposed on the upper side, lower side, front end, and rear end of the vertical plate. The upper cover plate 115, lower cover plate 116, front end plate 117, and rear cover plate 118 are respectively welded to the vertical plate 113. The weld between the upper cover plate 115 and the vertical plate 113, and the weld between the lower cover plate 116 and the vertical plate 113 are parallel to the axial direction of the force applied by the hydraulic end. The upper cover plate 115 and the lower cover plate 116 are respectively connected to the front end plate 117 through a tenon plate structure.

[0075] Multiple upper cover plates 115 and lower cover plates 116 are provided on the upper and lower sides of the first receiving cavity 1141 and the second receiving cavity 1142, respectively. That is, the upper cover plates 115 and lower cover plates 116 are connected to the upper and lower sides of the vertical plate 113, respectively. An upper cover plate 115 and a lower cover plate 116 are provided between two adjacent vertical plates 113. On the one hand, the two adjacent vertical plates 113 can be positioned. On the other hand, the weld between the upper cover plate 115 and the vertical plate 113 is parallel to the axis of the force applied by the hydraulic end. It is a connecting weld. The connecting weld is associated with the connected parts and is parallel to the direction of the force. It is a weld that transmits a very small load, that is, it only transmits part of the load and has a good load-bearing effect.

[0076] Each vertical plate 113 has a front end mounting and positioning groove at its front end (the end closest to the hydraulic end assembly 2). The front end plate 117 is positioned through the front end mounting and positioning groove and welded to the vertical plate 113. The front ends of the upper cover plate 115 and the lower cover plate 116 are connected to the front end plate 117 through a tenon structure and welded together. The tenon structure refers to the connection between the plates using grooves and tenon joints.

[0077] The tenon plate structure can increase the load-bearing capacity of the working weld between the upper cover plate 115 and the lower cover plate 116 and the front end plate 117 at critical stress points where it is not possible to design it as a connecting weld, thereby improving the reliability of the welded load-bearing capacity.

[0078] In some embodiments, such as Figure 8 As shown, the front ends of the upper cover plate 115 and the lower cover plate 116 are respectively provided with tenon head 1191, the front end plate 117 is provided with tenon hole 1192 that mates with the tenon head 1191, and the tenon head 1191 and / or the tenon hole 1192 are provided with a plurality of tenon welding bevels 1193.

[0079] The tenon head 1191 and the tenon hole 1192 are inserted and matched to ensure the reliability of the connection between the upper cover plate 115 and the lower cover plate 116 and the front end plate 117.

[0080] In this embodiment, the upper cover plate 115 and the lower cover plate 116 are designed as independent plate structures and welded to the upright plate 113 and the front end plate 117, which reduces the number of welds required for the power end housing 11. Simultaneously, tenon head 1191 is designed at the front end of the upper cover plate 115 and the lower cover plate 116, and tenon hole 1192 is designed on the front end plate 117 to engage with the tenon head 18. The two are then welded together. Furthermore, multiple tenon welding bevels 1193 (e.g., 5) are designed between the tenon head 1191 and the front end plate 117, and welding is performed at these bevels, effectively improving welding reliability. Since the tenon structure itself is supported by the front end plate 117, the stress on the weld is reduced, further improving welding reliability.

[0081] Similarly, such as Figure 6 As shown, among the multiple upright plates 113, the front ends of the two upright plates 113 located on the left and right sides are connected to the front end plate 117 through a tenon plate structure and welded together. This improves the welding load-bearing reliability between the upright plates 113 and the front end plate 117, while dispersing the overall weld stress of the power end housing 11 through the two upright plates 113 on the left and right sides. Furthermore, the tenon plate structure can be equipped with multiple tenon plate welding bevels 1193 to cooperate with multiple working welds, effectively reducing the load of a single working weld and improving welding reliability.

[0082] The power end housing 11 also includes a front reinforcing plate 1101 disposed below the front end plate 117. The front reinforcing plate 1101 is welded to the front end plate 117 and welded together with multiple upright plates 113. The front reinforcing plate 1101 can be welded below the front end plate 117 and welded together with 6 upright plates 9 to support the front end plate 117 and to provide structural reinforcement to the entire front end of the power end housing 11.

[0083] In this embodiment, the front end plate 117 and the front reinforcing plate 1101 are separate structures, which facilitates the connection between the front end plate 117 and the front end of the crosshead cylinder liner 111 and ensures the reliability of the connection. In a specific implementation, the front end plate 117 and the front reinforcing plate 1101 can be an integral structure to reduce the number of welds.

[0084] The front end plate 117 has a crosshead cylinder liner support hole for connecting with the crosshead cylinder liner 111. The front end of the crosshead cylinder liner 111 is welded to the corresponding crosshead cylinder liner support hole on the front end plate 117. The weld between the crosshead cylinder liner 111 and the front end plate 117 is a working weld. To enhance the load-bearing capacity of the weld at this location, a circumferential butt weld with a large welding area is formed between the crosshead cylinder liner 111 and the front end plate 117 to improve the load-bearing capacity at this location.

[0085] Optionally, the upper and lower ends of the crosshead cylinder liner 111 are respectively provided with crosshead cylinder liner support plates 1102. The crosshead cylinder liner support plates 1102 are welded to the left and right sides of the vertical plate 113, and the crosshead cylinder liner 111 is also welded to the left and right sides of the vertical plate 9. The welds between the crosshead cylinder liner 111 and the vertical plate 113 are all along the axis of the force applied at the hydraulic end, which are connecting welds with good load-bearing capacity.

[0086] like Figure 4 As shown, the power end housing 11 also includes a base 1103 disposed at the bottom of the power end housing 11, which is used to install the power end housing 11 with the whole machine. The rear cover plate 118 is welded to the rear end of the power end housing 11 (connected to the rear end of the upright plate 113) and is used for the assembly of components such as the connecting rod body seat 124 and for daily maintenance.

[0087] As can be seen from the above, the power end housing 11 in this embodiment is mainly in the form of connecting welds. Connecting welds can bear small loads and have good load-bearing effect. At key stress points where connecting welds cannot be designed, structures such as tenon plates and circumferential butt welds are designed to increase the load-bearing capacity of the working welds and improve the reliability of welding load-bearing. This effectively solves the abnormalities such as welding cracks caused by insufficient weld load-bearing capacity in traditional welded housings. The high-strength welded housing structure in this embodiment can take into account both the reliability of the power end housing load-bearing and the overall lightweight design, effectively realizing the lightweight design of the plunger pump.

[0088] In some embodiments, such as Figures 3 to 5 As shown, the power end assembly 1 also includes a main oil pipe assembly 14 detachably mounted on the power end housing 11. The main oil pipe assembly 14 includes a main oil pipe 141 and a transition joint 142. The main oil pipe 141 is fixed to the power end housing 11 through the transition joint 142. The end of the main oil pipe 141 is provided with a thread for connection to the transition joint 142.

[0089] The main oil pipe 141 is the main lubricating oil pipe. The main oil pipe 141 passes through the left and right ends of the power end housing 11. At the two ends exposed in the power end housing 11, the main oil pipe 141 is provided with external threads, which are reliably tightened and fixed to the transition joints 142 by means of threaded connection. Due to the tightening effect of the threads at both ends, the main oil pipe 36 is in a stretched state, thereby fixing the main oil pipe 141 to the power end housing 11 through the two transition joints 142 on the left and right sides. In this embodiment, the main oil pipe 141 is fixed to the power end housing 11 using a structure with threads at both ends. Compared to the traditional plunger pump structure where the main oil pipe 141 is directly welded to the power end housing 111, this embodiment uses a non-welded structure to fix the main oil pipe 141 to the power end housing 11 (installed on the outermost vertical plate 113), reducing unnecessary welding structures on the power end housing 11, avoiding the risk of potential weld defects, and improving the overall welding quality of the power end housing 11. In addition, the structure of fixing the main oil pipe 141 with threads at both ends is reliable and highly practical.

[0090] Furthermore, a sealing ring 143 is provided between the transition joint 142 and the power end housing 11, and a split flange 144 is provided on the outside of the transition joint 142, and the split flange 144 is fixed to the transition joint 142.

[0091] To achieve a seal between the transition joint 142 and the power end housing 11, a sealing ring 143 is installed between the transition joint mounting surface 144 and the transition joint 142. To ensure the sealing effect of the sealing ring 143, the transition joint 142 should not be tightened too much. To ensure the sealing effect of the sealing ring 143 and to prevent the transition joint 142 from loosening during operation, a split flange 144 is provided on the outer side of the transition joint 142 (the side away from the power end housing 11). The split flange 144 is used to compress and limit the transition joint 142, preventing it from loosening during operation. The split flange 144 is fixed by fixing bolts 145 and spring washers 146. The spring washer 146 is positioned between the fixing bolts 145 and the split flange 144. The fixing bolts 145 pass through the spring washer 146 and the split flange 144 in sequence and are fixed to the power end housing 11. The power end housing 11 has bolt mounting holes 147 for connecting to the fixing bolts 145.

[0092] Preferably, in order to achieve a reliable seal between the transition joint 142 and the power end housing 11, a transition joint mounting surface 148 can be machined on the power end housing 11, a sealing ring 143 is assembled between the transition joint mounting surface 148 and the transition joint 142, and a bolt mounting hole 147 is formed on the transition joint mounting surface 148.

[0093] In some embodiments, such as Figure 2 As shown, the connecting rod crosshead assembly 12 includes a pull rod 121, a crosshead 122, a connecting rod body 123, and a connecting rod body seat 124 connected in sequence. The crosshead 122 and the connecting rod body 123 are connected by a cross pin head 125. A crosshead small end bearing 126 is provided between the crosshead 122 and the connecting rod body 123. The connecting rod body seat 124 is connected to the crank 1311 of the crankshaft 131. A connecting rod large end bearing 127 is provided between the connecting rod body seat 124 and the crank 1311.

[0094] The tie rod 121 and the crosshead 122 are fixed together by bolts. The crosshead 122 and the connecting rod body 123 are connected together by the crosshead pin 125. The small end bearing 126 of the crosshead 122 and the connecting rod body 123 is assembled between them. The connecting rod body 123 and the connecting rod body seat 124 are fixed together by bolts. The connecting rod body seat 124 is assembled with the crank 1311 structure of the crankshaft 131. The big end bearing 127 of the connecting rod is assembled between the connecting rod body seat 124 and the crank 1311. The connecting rod body crosshead assembly 12 and the crankshaft assembly 13 are combined to form a crank-connecting rod mechanism. The rotational motion of the crankshaft assembly 13 drives the connecting rod body crosshead assembly 12 to reciprocate.

[0095] Preferably, the ratio of the crank radius of the crankshaft 131 to the connecting rod length of the connecting rod body 123 is 0.19 to 0.25.

[0096] This ratio is the connecting rod body ratio. In this embodiment, by reasonably designing the connecting rod body ratio, the load-bearing capacity and lightweight design of the entire pump can be balanced. Increasing the connecting rod body ratio parameter can shorten the distance between the crankshaft center of the plunger pump and the front end plate 117, and reduce the design weight of the connecting rod body 123 and the power end housing 11. However, increasing the connecting rod body ratio will increase the plunger acceleration and the swing angle of the connecting rod body 123, and the corresponding inertial force and lateral force will increase. In addition, the connecting rod body 123 and the crosshead 122 are prone to interference. Therefore, the parameter value of the connecting rod body ratio is set to 0.19 to 0.25, which balances the weight design and load-bearing design of the plunger pump, and achieves weight reduction of the plunger pump while ensuring the reliable load-bearing capacity of the plunger pump.

[0097] In some embodiments, the upper cover plate 115 has an upper observation window 1151, the lower cover plate 116 has a lower observation window 1161, the front end plate 117 has a front observation window 1171, and the rear cover plate 118 has a rear observation window 1181. The upper observation window 1151 and the lower observation window 1161 are torque assembly holes.

[0098] The upper observation window 21 is used for installing the bearing housing welding oil pipe, and to provide assembly space when applying torque between the fixing bolts and nuts on the upper side between the connecting rod body seat 124 and the connecting rod body 123. For example... Figure 20 and Figure 21 As shown, the upper observation window 1151 is positioned directly opposite the fixing nut between the connecting rod body 123 and the connecting rod body seat 124. When applying the required torque to the fixing nut between the connecting rod body 123 and the connecting rod body seat 124, a torque wrench can be inserted into the power end housing 11 through the upper observation window 1151 and connected to the fixing nut to apply the required torque. The lower observation window 29 provides assembly space when applying torque to the fixing bolts and nuts on the lower side between the connecting rod body seat 124 and the connecting rod body 123. Its function is similar to that of the upper observation window 1151, and will not be described further here.

[0099] By providing an upper observation window 1151 and a lower observation window 1161 on the power end housing 11, with the upper observation window 1151 and the lower observation window 1161 positioned directly opposite the fixing nuts of the connecting rod body seat 124 and the connecting rod body 123, a torque wrench can be applied to the required torque value through the upper observation window 1151 and the lower observation window 1161 respectively to the upper fixing nut and the lower fixing nut between the connecting rod body seat 124 and the connecting rod body 123. This effectively solves the problem of insufficient assembly space in the traditional power end housing 11 and the connecting rod body seat 123. The problem of the fixing nut between 24 and the connecting rod body 123 can only be tightened by a pneumatic wrench, making it impossible to accurately control the torque value of the fixing bolt between the connecting rod body seat 124 and the connecting rod body 123, has been addressed by improving the assembly quality of the product. At the same time, the structure of the upper observation window 1151 and the lower observation window 1161 can provide assembly space for the installation of the lubrication pipeline and connector of the crankshaft bearing seat 112. During routine maintenance, the usage status of the internal components of the power end can also be checked through the upper observation window 1151 and the lower observation window 1161.

[0100] The front observation window 1171 provides assembly and installation space for the lubrication pipes at the positions of the main oil pipe 141 and the crosshead 122. In this embodiment, as shown... Figure 1 As shown, the front observation window 1171 is opened on the front reinforcing plate 1101.

[0101] In some embodiments, such as Figure 3 and Figure 4 As shown, the power end housing 11 is also provided with a hoisting hole 1104, a hydraulic end connecting bolt fixing hole 1105, a tie rod oil seal seat fixing hole 1106, a base fixing hole 1107, etc.

[0102] For example, the power end housing 11 is provided with six lifting holes 1104, which are located at the front, middle and rear positions on the left and right sides of the power end housing, respectively. When lifting the power end assembly 1, four lifting holes 1104 at the front and rear positions are used; when assembling the whole machine onto the platform structure, the four lifting holes 1104 at the front and middle positions are used as mounting holes for fixing to the upper platform structure.

[0103] In this embodiment, to facilitate the hoisting of the plunger pump and improve the assembly efficiency of the whole machine, the power end housing 111 is designed with a hoisting hole 1104 and / or a mounting hole for the upper platform of the whole machine. The structural design of the hoisting hole 1104 facilitates the hoisting of the power end assembly 1 and the plunger pump assembly; the structural design of the mounting hole for the upper platform of the whole machine facilitates the installation of the upper platform of the whole machine, which improves the production efficiency of the whole machine compared with the traditional welding assembly method.

[0104] The hydraulic end connecting bolt fixing hole 1105 is used to fix the hydraulic end connecting bolt together. Multiple hydraulic end connecting bolts are fixed together with the hydraulic end assembly 2 to realize the connection between the power end assembly 1 and the hydraulic end assembly 2.

[0105] The tie rod oil seal seat fixing hole 1106 is used to fix the tie rod oil seal seat and tie rod oil seal assembly to achieve sealing of the tie rod 121 during reciprocating motion. The base fixing hole 1107 is used to install the plunger pump on the complete machine.

[0106] In some embodiments, such as Figure 9 As shown, the crankshaft assembly 13 includes a crankshaft 131, a crankshaft moving bearing 132, a crankshaft fixed bearing 133, and a crankshaft connecting flange 134. The crankshaft 131 is connected to the reduction gear assembly 3 through the crankshaft connecting flange 134. The crankshaft moving bearing 132 and the crankshaft fixed bearing 133 are installed in the crankshaft bearing housing 112 and are respectively connected to the crankshaft 131.

[0107] The reduction gear assembly 3 is connected to the crankshaft 131 via the crankshaft connecting flange 134, driving the crankshaft 131 to rotate. The crankshaft moving bearing 132 and the crankshaft fixed bearing 133 are installed in the crankshaft bearing housing 112 to support the crankshaft 131 and enable its rotational movement. The crankshaft fixed bearing 133 also serves to axially limit the crankshaft assembly 13.

[0108] Preferred, such as Figure 10 and Figure 11 As shown, the crankshaft 131 has weight-reducing grooves 1312 at both ends of its axial direction, which can achieve a lightweight design of the crankshaft 131 while ensuring its performance.

[0109] In some embodiments, such as Figure 12As shown, the reduction mechanism assembly 3 includes a drive flange 31, a herringbone tooth structure 32, and a drive connecting shaft 33. One end of the drive flange 31 is connected to the herringbone tooth structure 32, and the other end of the drive flange 31 is connected to an external power source. One end of the drive connecting shaft 33 is connected to the herringbone tooth structure 32, and the other end of the drive connecting shaft 33 is connected to the crankshaft connecting flange 134.

[0110] An external power source drives the herringbone tooth structure 32 to move through the drive flange 31, and transmits the power to the crankshaft connecting flange 134 through the drive connecting shaft 33 to drive the crankshaft assembly 13 to rotate.

[0111] The drive connecting shaft 33 is preferably a spline connecting shaft, with its two ends connected to the herringbone tooth structure 32 and the crankshaft connecting flange 134 respectively via splines. The two ends of the spline connecting shaft have external splines, and the herringbone tooth structure 32 and the crankshaft connecting flange 134 have internal splines that are connected to the external splines.

[0112] like Figure 12 As shown, the herringbone tooth structure 32 includes a gearbox housing and a large gear bearing 321, a large gear 322, a small gear bearing 323, and a small gear 324 installed in the gearbox housing. The large gear 322 and the small gear 324 mesh. The gearbox housing is provided with a large gear bearing seat 325 and a small gear bearing seat 326. The large gear bearing 321 is installed in the large gear bearing seat 325 and is axially connected to the large gear 322. The small gear bearing 321 is installed in the small gear bearing seat 326 and is axially connected to the small gear 324.

[0113] In this configuration, the external teeth of the large gear 322 and the external teeth of the small gear 324 mesh to form a herringbone tooth structure 32. A large gear bearing 321 is mounted on each of the axial sides of the large gear 322. Large gear bearing seats 325, connected to the large gear bearings 321, are located on opposite sides of the gearbox housing. The outer diameter of the large gear bearing 321 is fitted within the large gear bearing seat 325, and the inner diameter of the large gear bearing 321 is connected to the large gear shaft or large gear bushing of the large gear 322 (the large gear shaft or large gear bushing is located at the center of the large gear 322). This achieves the supporting function of the large gear bearing 321 on the large gear 322 and enables the rotational movement of the large gear 322. Similarly... A pinion bearing 323 is mounted on each of the two axial sides of the pinion 324. A pinion bearing seat 326 connected to the pinion bearing 323 is provided on the opposite sides of the gearbox housing. The outer diameter of the pinion bearing 323 is fitted inside the pinion bearing seat 326. The inner diameter of the pinion bearing 323 is connected to the pinion shaft or pinion bushing of the pinion 324 (the pinion shaft or pinion bushing is located at the center of the pinion 324), so as to realize the supporting function of the pinion bearing 323 on the pinion 324 and realize the rotational movement of the pinion 324. The axial end of the pinion 324 is provided with an external spline 3241, which is connected to the internal spline of the drive flange 31.

[0114] An external power source drives a pinion 324 to rotate via a drive flange 31. The pinion 324 meshes with a large gear 322. The rotation of the pinion 55 drives the large gear 322 to rotate via the meshing of the herringbone teeth. The rotation of the large gear 322 drives the crankshaft assembly 13 to rotate via the drive connecting shaft 33 and the crankshaft connecting flange 134.

[0115] The gearbox housing includes a first housing 3271 and a second housing 3272 arranged opposite to each other. Both the first housing 3271 and the second housing 3272 are provided with a large gear bearing seat 325 and a small gear bearing seat 326.

[0116] The first housing 3271 is preferably a housing with a certain accommodating space to accommodate the large gear bearing 321, the large gear 322, the small gear bearing 323, and the small gear 324; the second housing 3272 is preferably a cover, which facilitates disassembly and assembly and prevents the large gear bearing 321, the large gear 322, the small gear bearing 323, and the small gear 324 from being arranged at the connection between the first housing 3271 and the second housing 3272, which could cause damage to the large gear bearing 321, the large gear 322, the small gear bearing 323, and the small gear 324.

[0117] In this embodiment, the reduction mechanism of the reduction mechanism assembly 3 is set as a herringbone gearbox structure. Compared with the gear pair structure used in traditional plunger pumps, this effectively reduces the overall thickness of the large gear 322 and eliminates the pinion shaft structure, reducing the overall weight of the reduction structure and achieving a lightweight design for the plunger pump. Specifically, eliminating the pinion shaft structure means that the pinion shaft support structure and assembly space can be removed from the power end housing 11, achieving a lightweight design for the power end housing 11. Furthermore, the herringbone gearbox effectively eliminates the axial force of gear meshing, achieving higher transmission accuracy and transmitting larger torque, resulting in smooth operation and low noise, meeting the usage requirements of the plunger pump.

[0118] In some embodiments, such as Figure 13 As shown, the hydraulic end assembly 2 includes a valve box 21, a plunger 22, a valve body assembly 23, and a valve seat assembly 24. The valve box 21 is connected to the power end assembly 1 via hydraulic end connecting bolts, a positioning sleeve, and a hydraulic end connecting nut. The plunger 22 is connected to the pull rod 121 in the power end assembly 1 via a clamp assembly 25. The valve body assembly 23 and the valve seat assembly 24 are connected by a conical contact. The reciprocating motion of the pull rod 121 drives the plunger 22 in the hydraulic end assembly 2 to reciprocate together, thereby changing the volume of the sealing cavity in the valve box 21. This causes the valve body assembly 23 and the valve seat assembly 24 to open and close in a regular manner, achieving the purpose of pumping high-pressure liquid by the hydraulic end assembly 2.

[0119] Specifically, the hydraulic end assembly 2 also includes a packing assembly 261 and a packing cap 262. The packing assembly 261 is used to seal the plunger 22, and the packing cap 262 is used to fix the packing assembly 261. The packing cap 262 is also provided with an anti-loosening handle 263.

[0120] like Figure 13 As shown, the hydraulic end assembly 2 also includes a valve spring 271, a valve spring seat 272, and a valve spring seat sleeve 273. The valve spring 271 is connected to the valve body assembly 23. The valve spring seat sleeve 273 is used to fix the valve spring seat 272 and is connected to the valve body assembly 23 through the valve spring 271. The valve body assembly 23 and the valve seat assembly 24 are in conical contact.

[0121] like Figure 13 As shown, the hydraulic end assembly 2 also includes a discharge cap 281, a discharge cover 282, and a discharge cover seal 283. The discharge cap 281 is used to fix the discharge cover 282, and the discharge cover seal 283 on the discharge cover 282 is used to seal the position of the discharge cover 282. The boss at the lower end of the discharge cover 282 is connected to one end of the valve spring 271, and the other end of the valve spring 271 is connected to the valve body assembly 23.

[0122] In some embodiments, such as Figures 14 to 19 As shown, the fracturing plunger pump also includes a lubrication system assembly 4, which includes an oil collection block 41. The oil collection block 41 has a lubrication oil interface 411 and multiple lubrication oil outlets 412. The lubrication system assembly also includes multiple lubrication points disposed on the power end assembly, and the multiple lubrication points are connected to the multiple lubrication oil outlets 412.

[0123] The lubricating oil inlet 411 is connected to an external lubricating oil tank. External lubricating oil enters the oil collection block 41 through the lubricating oil inlet 411 and flows out from multiple lubricating oil outlets 412 to each lubrication point, lubricating the key lubrication positions in the power end assembly 1. The lubricating oil outlets 412 and the lubrication points can be connected by lubricating oil pipes or lubricating oil channels provided on the components.

[0124] Furthermore, such as Figures 15 to 17 As shown, the plurality of lubrication points include at least one of the following: pinion shaft bearing lubrication point 421, large gear bearing lubrication point 422, gear pair meshing position lubrication point 423, crankshaft bearing lubrication point 424, crosshead lubrication point 425, crankshaft lubrication input point 426, and connecting rod big end bearing lubrication point 427.

[0125] In some embodiments, such as Figure 7 As shown, the upper cover plate 115 and the lower cover plate 116 are respectively provided with oil return ports 43. The oil return ports 43 are used to return the lubricating oil of the power end assembly 1, so that the lubricating oil flows back to the lubricating oil tank, thereby realizing the circulation of lubricating oil in the entire lubrication system.

[0126] Preferred, such as Figure 22 and Figure 23 As shown, the oil return port 43 has a slot structure with a snap-fit ​​part 431. The slot structure of the oil return port 43 can be fixed together with the oil return pipeline of the whole machine by clamps. The structure is simple, reliable, easy to operate, and more reliable in performance.

[0127] like Figure 24 As shown, the oil return port 43 can also be a threaded structure. However, the oil return pipe of the whole machine needs to be screwed into the threaded hole of the oil return port 43. At the same time, in order to prevent the oil return pipe and the oil return port 43 from loosening and causing oil leakage during operation, the oil return pipe will be screwed into the threaded hole of the oil return port and then welded together with the oil return port. This operation may be inconvenient.

[0128] Lightweight design concepts for plunger pumps include shortening cylinder spacing, shortening stroke, reducing reduction ratio, and increasing connecting rod body ratio. The fracturing plunger pump provided in this embodiment can achieve lightweight design by adopting a high-strength welded shell structure, increasing the connecting rod body ratio, and using a herringbone gearbox structure, while maintaining the same cylinder spacing, stroke, and reduction ratio parameters as traditional plunger pumps. This lightweight design better meets customers' needs for lightweight plunger pumps and enhances the market competitiveness of plunger pump products.

[0129] The above description is merely a preferred embodiment of this utility model and an explanation of the techniques used. Those skilled in the art should understand that the scope of disclosure involved in this utility model is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this utility model.

[0130] Furthermore, although the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. Multitasking and parallel processing may be advantageous in certain environments. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this invention. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0131] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A fracturing plunger pump characterized by, The power end assembly, the hydraulic end assembly and the reduction mechanism assembly are connected with an external power source respectively, the power end assembly is connected with the hydraulic end assembly, The power end assembly comprises a power end housing, a connecting rod body crosshead assembly and a crankshaft assembly, one side of the connecting rod body crosshead assembly is connected with the crankshaft of the crankshaft assembly, and the other side of the connecting rod body crosshead assembly is installed in a crosshead cavity of the power end housing; The power end housing comprises a plurality of crosshead cylinder sleeves, a plurality of crankshaft bearing seats and a plurality of vertical plates, the plurality of crankshaft bearing seats are installed on the plurality of vertical plates one by one, a first accommodating cavity for accommodating a crank web of the crankshaft is formed between two adjacent crankshaft bearing seats, a second accommodating cavity for accommodating the crosshead cylinder sleeve is formed between two adjacent vertical plates, each crosshead cylinder sleeve has the crosshead cavity, and the crosshead cavity is communicated with the first accommodating cavity.

2. The fracturing plug pump of claim 1, wherein, The crosshead cylinder sleeve is welded with the vertical plate, and the welding seam between the crosshead cylinder sleeve and the vertical plate is along the axis direction of the force applied by the hydraulic end.

3. The fracturing plug pump of claim 1, wherein, The power end housing further comprises an upper cover plate, a lower cover plate, a front end plate and a rear cover plate arranged on the upper side, the lower side, the front end and the rear end of the vertical plate, the upper cover plate, the lower cover plate, the front end plate and the rear cover plate are welded with the vertical plate respectively, the welding seam between the upper cover plate and the vertical plate and the welding seam between the lower cover plate and the vertical plate are parallel to the axis direction of the force applied by the hydraulic end, and the upper cover plate and the lower cover plate are connected with the front end plate through a swallow plate structure respectively.

4. The fracturing plug pump of claim 3, wherein, The front end of the upper cover plate and the front end of the lower cover plate are respectively provided with a swallow plate head, the front end plate is provided with a swallow plate hole matched with the swallow plate head, and a plurality of swallow plate welding grooves are arranged on the swallow plate head and / or the swallow plate hole.

5. The fracturing plug pump of claim 3, wherein, An upper observation window hole is arranged on the upper cover plate, a lower observation window hole is arranged on the lower cover plate, a front observation window hole is arranged on the front end plate, and a rear observation window hole is arranged on the rear cover plate, and the upper observation window hole and the lower observation window hole are torque assembly holes.

6. The fracturing plug pump of claim 1, wherein, The power end assembly further comprises a main oil pipe assembly detachably installed on the power end housing, The main oil pipe assembly comprises a main oil pipe and a transition joint, the main oil pipe is fixed with the power end housing through the transition joint, and the end of the main oil pipe is provided with a thread connected with the transition joint; and / or A sealing ring is arranged between the transition joint and the power end housing, the outer side of the transition joint is provided with a split flange fixed with the transition joint; and / or The transition joint mounting surface is arranged on the power end housing.

7. The fracturing plug pump of claim 1, wherein, The connecting rod body crosshead assembly comprises a pull rod, a crosshead, a connecting rod body and a connecting rod body seat connected in sequence, the crosshead is connected with the connecting rod body through a cross pin head, a crosshead small-end bushing is arranged between the crosshead and the connecting rod body, the connecting rod body seat is connected with the crank web of the crankshaft, and a connecting rod big-end bushing is arranged between the connecting rod body seat and the crank web; and / or The ratio of the crank radius of the crankshaft to the connecting rod length of the connecting rod body is 0.19-0.

25.

8. The fracturing plug pump of claim 1, wherein, The crankshaft assembly comprises a crankshaft, a crankshaft dynamic bearing, a crankshaft fixed bearing and a crankshaft connecting flange, the crankshaft is connected with the speed reduction mechanism assembly through the crankshaft connecting flange, the crankshaft dynamic bearing and the crankshaft fixed bearing are installed in the crankshaft bearing seat and connected with the crankshaft respectively; and / or The crankshaft is provided with a weight-reducing groove at both axial ends.

9. The fracturing plug pump of claim 8, wherein, The speed reduction mechanism assembly comprises a driving flange, a herringbone tooth structure and a driving connecting shaft, one end of the driving flange is connected with the herringbone tooth structure, the other end of the driving flange is connected with the external power source, one end of the driving connecting shaft is connected with the herringbone tooth structure, and the other end of the driving connecting shaft is connected with the crankshaft connecting flange; and / or The herringbone tooth structure comprises a gear box shell and a large gear bearing, a large gear, a pinion bearing and a pinion installed in the gear box shell, the large gear and the pinion are engaged, the gear box shell is provided with a large gear bearing seat and a pinion bearing seat, the large gear bearing is installed in the large gear bearing seat and connected with the large gear in an axial direction, and the pinion bearing is installed in the pinion bearing seat and connected with the pinion in an axial direction.

10. The fracturing plug pump of claim 3, wherein, The fracturing plunger pump further comprises a lubricating system assembly, the lubricating system assembly comprises an oil collecting block, the oil collecting block is provided with a lubricating oil interface and a plurality of lubricating oil outlets, the lubricating system assembly further comprises a plurality of lubricating points arranged in the power end assembly, and the plurality of lubricating points are connected with the plurality of lubricating oil outlets; and / or The plurality of lubricating points comprise at least one of a pinion shaft bearing lubricating point, a large gear bearing lubricating point, a gear pair engagement position lubricating point, a crankshaft bearing lubricating point, a cross head lubricating point, a crankshaft lubricating input point and a connecting rod big end bearing lubricating point; and / or The upper cover plate and the lower cover plate are respectively provided with an oil return port.

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