Long-stroke fracturing pump power end and fracturing pump

Abstract

The invention discloses a long-stroke fracturing pump power end and a fracturing pump, and relates to the technical field of reciprocating pumps, and the power end comprises an input shaft assembly, a crankshaft gear, a crankshaft assembly, a rocker, a subdivision sliding block, a crosshead, an integral sliding block, a pump body, a sliding shoe and a rocker shaft. External power drives the input shaft assembly to rotate, the input shaft assembly drives the crankshaft assembly to rotate through the crankshaft gear so as to drive the subdivision sliding block to slide, the subdivision sliding block drives the rocker to swing in a reciprocating mode from the middle of the rocker, and the integral sliding block on the lower portion of the rocker drives the crosshead to do synchronous reciprocating motion. The stroke of the crosshead is far greater than the rotation diameter of the crankshaft due to the displacement amplification effect of the rocker, so that the long stroke of the fracturing pump is realized; the crankshaft is arranged right above the sliding shoe, a connecting rod in a traditional fracturing pump is omitted, the stroke of the fracturing pump is increased, but the length is reduced, and the weight is not increased; the fracturing pump power end and the fracturing pump are long in stroke, low in stroke frequency, long in service life of quick-wear parts, compact in structure and convenient to assemble and disassemble.

Description

Technical Field

[0001] The present invention relates to the technical field of reciprocating pumps in the fields of petroleum, chemical engineering, and machinery manufacturing, and more specifically, to a power end of a long-stroke fracturing pump and a fracturing pump. Background Art

[0002] Fracturing is a key technology for increasing oil and gas production, and its core equipment is a fracturing pump. The fracturing pump is a typical reciprocating pump. Currently, the power end of the fracturing pump widely adopts the working principle of a crank-link mechanism. Its main advantages are stable commutation, reliable operation, and simple multi-cylinder phase control; the main disadvantages are a short stroke, a high stroke frequency, a short service life of the pump valve and the reciprocating high-pressure seal, and it is difficult to reduce the weight and size.

[0003] Multiple patents at home and abroad have proposed hydraulic-driven fracturing pumps. Although they can increase the stroke of the fracturing pump and reduce the stroke frequency, they require a high-power hydraulic pumping station, with a complex system, low efficiency, and poor reliability.

[0004] Patent CN110454348A discloses a long-stroke reciprocating pump with a crank-link mechanism plus a gear-rack stroke-increasing mechanism, achieving the purpose of increasing the stroke, but both the length and the total weight of the pump will increase. Patent CN114135459A discloses a long-stroke reciprocating pump with a crank-link mechanism plus a swing rod stroke-increasing mechanism, solving the problem of the increase in the length of the reciprocating pump caused by the increase in the stroke, but the newly added swing rod increases the weight of the reciprocating pump and fails to solve the problem of the excessive weight of the pump. Summary of the Invention

[0005] In order to overcome the defects existing in the above-mentioned prior art, the present invention discloses a power end of a long-stroke fracturing pump and a fracturing pump to solve the problems of large structural size and weight and poor transportability of the crank-link mechanism long-stroke reciprocating pump in the prior art.

[0006] In order to achieve the above purposes, the technical solution adopted by the present invention is as follows: A power end of a long-stroke fracturing pump includes an input shaft assembly, a crankshaft gear, a crankshaft assembly, a rocker, a split slider, a crosshead, an integral slider, a pump body, a slipper, and a rocker shaft; Both the input shaft assembly and the crankshaft assembly are rotationally assembled on the pump body, and the crankshaft gear is assembled at both ends of the crankshaft assembly and meshes with the input shaft assembly; The upper part of the rocker is rotatably installed on the pump body through a rocker shaft, a split groove is provided in the middle part, and the lower part is connected to the integral slider; the inner hole of the split slider is assembled on the crank of the crankshaft assembly, and the outer surface is slidably assembled in the split groove of the rocker; the integral slider is connected to the crosshead, the slipper is assembled on the pump body, and the crosshead is slidably assembled on the slipper; The input shaft assembly rotates driven by the input power, drives the crankshaft assembly to rotate through the meshing crankshaft gear, the rotation of the crankshaft assembly drives the split slider to slide in the rocker split groove, drives the rocker to swing reciprocally around the rocker shaft, and drives the integral slider and the crosshead at the bottom of the rocker to reciprocate on the slipper to provide the reciprocating power of the fracturing pump; During the swinging process of the rocker, the stroke of the reciprocating movement in the horizontal direction at the connection part with the integral slider in the lower part is greater than the stroke of the horizontal reciprocating movement at the contact part between the middle part of the rocker and the split slider.

[0007] In the present invention, the function of the power end of the long-stroke fracturing pump is to convert the rotational motion and torque input on the input shaft assembly into the reciprocating motion and thrust of the crosshead, and obtain a longer stroke than that of the fracturing pump with the traditional crank connecting rod mechanism.

[0008] In the present invention, the input shaft assembly rotates driven by the input power, simultaneously drives the two crankshaft gears fixed at both ends of the crankshaft assembly through the two input shaft gears fixedly connected thereto, makes the crankshaft rotate, and the crank pin pushes the split slider connected to the crank pin and capable of rotating around the center of the crank pin to generate a thrust or pulling force on the rocker at the middle position of the rocker, makes the rocker swing back and forth around the upper rotation center, thereby driving the integral slider connected to the pin hole at the lower part of the rocker and capable of rotating around the center of the pin hole to generate a horizontal thrust or pulling force on the crosshead, realizes the reciprocating motion of the crosshead, and then sucks and pressurizes the fracturing fluid through the connecting rod, the clamp, and the piston rod to push the piston (plunger) and then discharges it.

[0009] As Figure 1 shown, during the swinging process of the rocker, the stroke of the reciprocating movement in the horizontal direction of the center of the pin hole in the lower part is 2B, which is equal to the stroke of the crosshead, that is, the stroke of the fracturing pump is 2B, and its size is the distance between the two extreme positions of the center of the pin hole in the lower part of the rocker, and is proportional to the rotation radius L2 of the center of the pin hole in the lower part of the rocker; when the rocker is at the two extreme positions, the crank radius is perpendicular to the rocker, and the horizontal distance between the centers of the crank pins at the two extreme positions is 2A. Since the included angle of the rocker at the two extreme positions is small, the value of 2A is very close to the rotation diameter of the crank pin; when the rocker is at the two extreme positions, the distance from the foot of the perpendicular of the crank radius to the rotation center of the rocker is L1, and the stroke 2B of the fracturing pump = 2A×(L2 / L1); because L2 / L1>1, the stroke 2B of the fracturing pump is greater than the rotation diameter of the crank pin, and the stroke is amplified. When L2 / L1 = 2, the stroke 2B of the fracturing pump is about twice the rotation diameter of the crank pin, and the long stroke of the fracturing pump is realized without changing the rotation radius of the crankshaft.

[0010] In the present invention, the crankshaft assembly is installed above the middle position of the slipper, and pushes or pulls the rocker through the split slider at the middle position of the rocker, canceling the connecting rod in the traditional fracturing pump, increasing the stroke of the fracturing pump but reducing the total length, and not increasing the weight of the pump.

[0011] Preferably, in one cycle of reciprocating motion of the crosshead, the angle of rotation of the crankshaft assembly during the liquid discharge stroke of pushing the piston is not equal to the angle of rotation of the crankshaft assembly during the liquid suction stroke of pulling the piston, and the angle of rotation during the liquid discharge stroke is greater than the angle of rotation during the liquid suction stroke.

[0012] In the present invention, in one cycle of reciprocating motion of the crosshead, the angle of rotation of the crankshaft during the liquid discharge stroke of pushing the piston (plunger) is not equal to the angle of rotation of the crankshaft during the liquid suction stroke of pulling the piston (plunger). The reciprocating motion of the crosshead has the characteristic of quick-return motion. By selecting the rotation direction of the crankshaft, the rotation angle of the crankshaft during the liquid discharge stroke is made greater than the rotation angle of the crankshaft during the liquid suction stroke, so as to reduce the moving speed of the crosshead when it bears a large thrust, thereby reducing the wear speed of the piston (plunger) seal, the crosshead and the slipper, the integral slider and the split slider, and reducing the peak power required to be input by the fracturing pump; in addition, the quick-return motion characteristic increases the peak value of the discharge flow rate of the fracturing pump and increases the pulsation rate of the displacement, which is suitable for the vibration fracturing process.

[0013] Preferably, the input shaft assembly includes an input shaft, an input shaft gear, a first rolling bearing, a first screw, an input shaft retaining ring and a bushing; The input shaft includes a large-diameter middle section and small-diameter left and right sections. The first rolling bearing is assembled at both ends of the large-diameter section, and the input shaft assembly is installed in the pump body through the first rolling bearing; the input shaft gear is assembled on the small-diameter left and right sections, and the bushing is located on the input shaft between the first rolling bearing and the input shaft gear; the input shaft retaining ring is arranged at both ends of the input shaft, and the first screw is assembled on the input shaft retaining ring.

[0014] Preferably, the crankshaft assembly includes a flange, a crankshaft, a second rolling bearing, a second screw, a split retaining ring, a shaft end retaining ring and a third screw; The flange is assembled at both ends of the crankshaft, and the shaft end retaining ring is assembled on the flange and a third screw is provided thereon; a plurality of second rolling bearings are provided and assembled on the crankshaft. The crankshaft assembly is installed in the pump body through the plurality of second rolling bearings, and the split retaining ring is assembled at both ends of the second rolling bearing and a second screw is provided thereon.

[0015] Preferably, the rocker includes a rocker body, a rod end cover and a first bolt; The lower part of the rocker body is of a U-shaped structure and is provided with a lower pin hole, and the upper part is provided with an upper pin hole; the contact position between the middle part of the rocker body and the split slider is set as a groove, and the contact surface between the groove and the split slider is a cylindrical surface; The rod end cover adopts a groove structure and is fixed at the groove of the rocker body through the first bolt. The two grooves are opposite to form a slider guide groove; the contact surface between the groove of the rod end cover and the split slider is a cylindrical surface, and has the same radius as the cylindrical surface where the rocker body contacts the split slider and the centers coincide after assembly.

[0016] Preferably, the split slider includes a slider body, a slider cover and a second bolt; The slider cover covers the slider body and is fixed by the second bolt. Half holes are provided on both the slider body and the slider cover. After covering, the two half holes form a crankshaft transverse perforation, and a bearing installation groove is provided in the crankshaft transverse perforation; on the side surfaces of the slider body and the slider cover where they contact the rocker, cylindrical surfaces with the same radius as the cylindrical surface on the rocker are provided; A self-aligning bearing is installed in the bearing installation groove, and a gap is reserved between the cylindrical surfaces at the contact part of the split slider and the rocker.

[0017] In the present invention, the split slider connected to the crank pin is split into a slider body and a slider cover from the central position of the inner hole, a groove for installing a bearing is provided in the inner hole, and a self-aligning bearing is used to install on the crank pin; the contact part between the slider and the rocker is set as a cylindrical surface structure, and an interference fit is adopted between the contacting cylindrical surfaces, which not only limits the axial position of the slider on the crank pin, but also allows the slider to rotate relative to the rocker around the center of the cylindrical surface; the outer cylindrical surface where the split slider contacts the rocker and the inner hole groove for installing the bearing are both machined after the slider body and the slider cover are assembled into a whole. The part of the bearing embedded in the inner hole groove during assembly has an axial and radial positioning effect on the slider body and the slider cover, and no other positioning devices need to be set.

[0018] In the present invention, the groove where the rocker contacts the split slider adopts a split structure, so that the crankshaft and the split slider can be conveniently assembled and passed through the rocker.

[0019] Preferably, the crosshead includes a crosshead body, a head end cover and an inner hexagon screw; The end of the crosshead body is in an inverted T-shaped structure, and the bottom surface of the inverted T-shaped structure is a cylindrical surface that contacts the slipper; a U-shaped groove is opened in the middle of the crosshead body, and the head end cover is covered in the U-shaped groove through the inner hexagon screw to form an integral slider installation cavity, and a cylindrical surface adapted to the integral slider is provided in the integral slider installation cavity.

[0020] In the present invention, the crosshead is a combined structure, and the part connected to the slider is designed as a U-shaped groove structure with an arc-shaped cross section. The slider can be conveniently inserted into the groove of the crosshead, and the machining accuracy of the cylindrical surface where the U-shaped groove contacts the slider is high and the machining is simple.

[0021] Preferably, the integral slider includes a pin shaft, an integral slider body, an integral slider retaining ring, and a fourth screw; The integral slider body is slidably assembled in the integral slider installation cavity. The part of the integral slider body in contact with the crosshead body is a cylindrical surface, whose radius is the same as the nominal size of the cylindrical surface at the contact part of the U-shaped groove of the crosshead body, and a gap is reserved between the two contact cylindrical surfaces. A cylindrical hole is provided in the middle part of the integral slider body, and the pin shaft passes through the cylindrical hole. A sliding bearing or a rolling bearing is used for the assembly between the cylindrical hole in the middle of the integral slider body and the pin shaft; The length of the pin shaft is shorter than the outer width of the U-shaped structure at the lower part of the rocker body. The pin shaft passes through the pin hole at the lower part of the rocker body. After the integral slider retaining ring is respectively fixed to both ends of the pin shaft with the fourth screw, the integral slider retaining ring generates a pressing force on the outside of the U-shaped structure at the lower part of the rocker body, and the pin shaft and the rocker body are fixed together.

[0022] In the present invention, in the integral slider that pushes the crosshead, the contact surface between the slider and the crosshead is also designed as a cylindrical surface, and an interference fit is also adopted between the cylindrical surfaces in contact between the crosshead and the slider, which is coordinated with the cylindrical surface contact between the crosshead and the slipper, and can well adapt to the geometric tolerance between the crankshaft rotation center, the pin hole center on the rocker, and the slipper center.

[0023] Preferably, the pump body includes a pump head fixing plate, a first bearing seat, side plates, brackets, a second bearing seat, a main bearing seat, a bearing cover, a third bolt, a bottom plate, a rear side plate, a lower fixing seat, an inclined bottom plate, an upper fixing seat, a top plate, and a front side plate; The pump head fixing plate, the bracket, the front side plate, the rear side plate, the side plates, the top plate, and the bottom plate are respectively located at the head of the pump body, the bottom end of the head, the front side, the rear side, the left and right sides, the top, and the bottom; The first bearing seat is located behind the pump head fixing plate and is used for assembling the first rolling bearing of the input shaft assembly; the second bearing seat is located behind and above the first bearing seat and is used for assembling the bearing of the rocker shaft; the main bearing seat is located in the middle of the pump body and is used for installing the second rolling bearing of the crankshaft assembly. The bearing cover is installed on the main bearing seat through the third bolt; The lower fixing seat is located in front of the rear side plate, the inclined bottom plate is located below the main bearing seat, and the upper fixing seat is located in front of the main bearing seat.

[0024] Based on the above power end of the long-stroke fracturing pump, the present invention also provides a long-stroke fracturing pump, including the power end of the long-stroke fracturing pump, as well as a connecting rod, a clamp, a piston rod, a piston, a pump head, a suction valve, a suction pipe, a discharge pipe, and a discharge valve; The crosshead of the power end of the long-stroke fracturing pump is connected to the intermediate rod, the intermediate rod is connected to the piston rod through the clamp, the piston rod is connected to the piston, the piston is arranged in the pump head, the pump head is connected with a suction pipe and a discharge pipe, and the suction valve and the discharge valve are respectively arranged on the suction pipe and the discharge pipe.

[0025] In the present invention, the structures of the intermediate rod, the clamp, the piston rod, the cylinder liner, the piston, the pump head, the suction valve, the discharge valve, the liquid inlet pipe and the liquid discharge pipe and the connection modes among them are the same as those of the existing fracturing pump. The three-cylinder, five-cylinder or seven-cylinder arrangements can be adopted.

[0026] The structural principle of the power end of the ultra-long-stroke fracturing pump of the present invention can be applied to other reciprocating pumps, such as drilling mud pumps; the double-cylinder, 4-cylinder or six-cylinder arrangements can also be adopted.

[0027] The beneficial effects of the present invention are as follows: (1) The center of rotation of the crankshaft is located at the middle position of the rocker, the crosshead is located at the lower end of the rocker, and the reciprocating motion stroke of the crosshead is amplified and much larger than the rotation diameter of the crankshaft, significantly increasing the stroke of the reciprocating pump without changing the rotation diameter of the crankshaft.

[0028] (2) The contact parts between the split slider and the rocker, the integral slider and the crosshead, and the crosshead and the slipper all adopt cylindrical surface contact, which not only realizes the required moving function, but also enables the two contacting parts to rotate relative to each other around the center of the contact cylindrical surface, having good adaptability to the form and position tolerances among the center of rotation of the crankshaft, the rocker and the crosshead, and reducing the processing precision requirements for the pump body.

[0029] (3) The split slider can be conveniently assembled onto the crankshaft.

[0030] (4) The slider guide groove of the rocker adopts a split structure, making it easier for the slider and the crankshaft to be assembled with the rocker.

[0031] (5) The crosshead adopts a combined structure, the integral slider is inserted into the groove of the crosshead body from above, and the cylindrical surface diameter of the groove of the crosshead body can be obtained with good processing precision by grinding, which is convenient for processing.

[0032] (6) The reciprocating motion of the crosshead has a quick-return motion characteristic. The speed during the liquid discharge stroke is low, which can reduce the wear rates of the piston (plunger) seal, the crosshead, the slider, etc. and the peak value of the input power of the fracturing pump; the quick-return motion characteristic causes a large pulsation in the displacement of the fracturing pump, and vibration fracturing can be realized without adding other equipment.

[0033] (7) Since there is no connecting rod and the installation position of the crankshaft is above the middle of the slipper, the total length of the fracturing pump is significantly reduced compared with the traditional crank-slider mechanism, and the weight does not increase.

[0034] (8) It can achieve a low stroke frequency and further improve the service life of the pump head, pump valve, piston (plunger) seal, crosshead, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a working schematic diagram of the power end of a long-stroke fracturing pump according to the present invention; Figure 2 It is a working schematic diagram of a long-stroke fracturing pump according to the present invention; Figure 3 It is a three-dimensional structure of an embodiment of a long-stroke fracturing pump according to the present invention Figure 1 ; Figure 4 It is a three-dimensional structure of an embodiment of a long-stroke fracturing pump according to the present invention Figure 2 ; Figure 5 It is a three-dimensional view of the rocker in the embodiment of the present invention; Figure 6 It is a three-dimensional view of the rocker body in the embodiment of the present invention; Figure 7 It is a three-dimensional view of the rod end cover in the rocker of the embodiment of the present invention; Figure 8 It is a three-dimensional view of the split slider in the embodiment of the present invention; Figure 9 It is a three-dimensional view of the crosshead in the embodiment of the present invention; Figure 10 It is a three-dimensional view of the crosshead body in the crosshead of the embodiment of the present invention; Figure 11 It is a three-dimensional view of the head body end cover of the crosshead in the embodiment of the present invention; Figure 12 It is a three-dimensional assembly view of the lower integral slider in the embodiment of the present invention; Figure 13 It is a three-dimensional view of the integral slider body in the integral slider of the embodiment of the present invention; Figure 14 It is a three-dimensional view of the input shaft assembly in the embodiment of the present invention; Figure 15 It is a three-dimensional view of the crankshaft assembly in the embodiment of the present invention; Figure 16 It is a three-dimensional view of the pump body in the embodiment of the present invention.

[0036] REFERENCE SIGNS: 100 - Input shaft assembly; 101 - Input shaft; 102, 104 - Input shaft gears; 103 - First rolling bearing; 105 - First screw; 106 - Input shaft retaining ring; 107 - Bush; 2, 20 - Crankshaft gears; 300 - Crankshaft assembly; 301 - Flange; 302 - Crankshaft; 303 - Second rolling bearing; 304 - Second screw; 305 - Split retaining ring; 306 - Shaft end retaining ring; 307 - Third screw; 400 - Rocker; 401 - Rocker body; 402 - Rod end cover; 403 - First bolt; 500 - Split slider; 501 - Slider body; 502 - Slider cover; 503 - Second bolt; 600 - Crosshead; 601 - Crosshead body; 602 - Head body cover; 603 - Socket head cap screw; 700 - Integral slider; 701 - Pin shaft; 702 - Integral slider body; 703 - Integral slider retaining ring; 704 - Fourth screw; 800 - Pump body; 801 - Pump head fixing plate; 802 - First bearing seat; 803 - Side plate; 804 - Bracket; 805 - Second bearing seat; 806 - Main bearing seat; 807 - Bearing cover; 808 - Third bolt; 809 - Bottom plate; 810 - Rear side plate; 811 - Lower fixing seat; 812 - Inclined bottom plate; 813 - Upper fixing seat; 814 - Top plate; 815 - Front side plate; 9 - Slipper; 10 - Intermediate rod; 11 - Clamp; 12 - Piston rod; 13 - Piston (or plunger); 14 - Pump head; 15 - Suction valve; 16 - Suction pipe; 17 - Discharge pipe; 18 - Discharge valve; 19 - Rocker shaft. Detailed implementation manners

[0037] The following will clearly and completely describe the concept, specific structure and technical effects generated by the present invention in combination with the embodiments and the drawings, so as to fully understand the purpose, features and effects of the present invention.

[0038] Embodiment 1 A power end of a long - stroke fracturing pump, as Figures 1-4 shown, includes an input shaft assembly 100, crankshaft gears 2 and 20, a crankshaft assembly 300, a rocker 400, a split slider 500, a crosshead 600, an integral slider 700, a pump body 800, a slipper 9 and a rocker shaft 19; The input shaft assembly 100 and the crankshaft assembly 300 are both rotationally assembled on the pump body 800, and the crankshaft gears 2 and 20 are assembled at both ends of the crankshaft assembly 300 and mesh with the input shaft assembly 100; The upper part of the rocker 400 is rotatably mounted on the pump body 800 through a rocker shaft 19, a split groove is provided in the middle part, and the lower part is connected to the integral slider 700; the inner hole of the split slider 500 is assembled on the crank of the crankshaft assembly 300, and the outer surface is slidably assembled in the split groove of the rocker 400; the integral slider 700 is connected to the crosshead 600, the slipper 9 is assembled on the pump body 800, and the crosshead 600 is slidably assembled on the slipper 9; The input shaft assembly 100 rotates under the drive of the input power, drives the crankshaft assembly 300 to rotate through the meshing crankshaft gears 2 and 20, the rotation of the crankshaft assembly 300 drives the split slider 500 to slide in the split groove of the rocker 400, drives the rocker 400 to swing reciprocally around the rocker shaft 19, and drives the integral slider 700 and the crosshead 600 at the bottom of the rocker 400 to reciprocate on the slipper 9 to provide the reciprocating power of the fracturing pump; During the swinging process of the rocker 400, the stroke of the reciprocating movement in the horizontal direction at the connecting part between the lower part and the integral slider 700 is greater than the stroke of the horizontal reciprocating movement at the contact part between the middle part of the rocker 400 and the split slider 500.

[0039] In this embodiment, the function of the power end of the long-stroke fracturing pump is to convert the rotational motion and torque input on the input shaft assembly 100 into the reciprocating motion and thrust of the crosshead 600, and obtain a longer stroke than that of the traditional crank and connecting rod mechanism fracturing pump.

[0040] The input shaft assembly 100 rotates under the drive of the input power, drives the crankshaft gears 2 and 20 to rotate through the input shaft gears 102 and 104 on it to make the crankshaft assembly 300 rotate, the crank pin of the crankshaft assembly 300 pushes the split slider 500 to generate a thrust or pulling force on the rocker 400, makes the rocker 400 swing back and forth around the upper rotation center, thereby driving the integral slider 700 to generate a horizontal thrust or pulling force on the crosshead 600 to make the crosshead 600 reciprocate, and then pushes the piston (plunger) 13 through the connecting rod 10, the clamp 11, and the piston rod 12 to suck and pressurize the fracturing fluid and then discharge it; during the swinging process of the rocker 400, the stroke of the reciprocating movement in the horizontal direction at the connecting part between the lower part and the integral slider 700 is greater than the stroke of the horizontal reciprocating movement at the contact part between the middle part of the rocker 400 and the split slider 500. Therefore, with the same crank pin rotation radius as that of the traditional crank and connecting rod mechanism fracturing pump, the crankshaft assembly 300 can achieve a larger reciprocating stroke of the crosshead 600 than that of the traditional crank and connecting rod mechanism fracturing pump, so that the fracturing pump obtains a long stroke.

[0041] Embodiment 2 This embodiment is further elaborated on the basis of Embodiment 1. During one cycle of reciprocating motion of the crosshead 600, the angle by which the crankshaft assembly 300 of the piston's liquid discharge stroke rotates is not equal to the angle by which the crankshaft assembly 300 of the piston's liquid suction stroke rotates, and the angle of rotation during the liquid discharge stroke is greater than the angle of rotation during the liquid suction stroke.

[0042] In this embodiment, during one cycle of reciprocating motion of the crosshead 600, the angle by which the crankshaft 302 of the piston (plunger) 13's liquid discharge stroke rotates is not equal to the angle by which the crankshaft 302 of the piston (plunger) 13's liquid suction stroke rotates. The reciprocating motion of the crosshead 600 has the characteristic of quick-return motion. By selecting the rotation direction of the crankshaft 302, the rotation angle of the crankshaft 302 during the liquid discharge stroke is (π + 2θ), which is greater than the rotation angle (π - 2θ) of the crankshaft 302 during the liquid suction stroke, so as to reduce the motion speed of the crosshead during liquid discharge, thereby reducing the wear speed of the seal of the piston (plunger) 13, the crosshead 600, the slipper 9, the integral slider 700, and the split slider 500, and at the same time reducing the peak power required to be input by the fracturing pump; in addition, the quick-return motion characteristic increases the peak value of the discharge flow rate of the fracturing pump and the pulsation rate of the displacement, and is applicable to the vibration fracturing process.

[0043] Embodiment 3 This embodiment is further elaborated on the basis of Embodiment 2, as Figure 14 shown, the input shaft assembly 100 includes an input shaft 101, input shaft gears 102 and 104, a first rolling bearing 103, a first screw 105, an input shaft retaining ring 106, and a shaft sleeve 107; The input shaft 101 includes a large-diameter middle section and small-diameter left and right sections. The first rolling bearing 103 is assembled at both ends of the large-diameter section, and the input shaft assembly 100 is installed in the pump body 800 through the first rolling bearing 103. The input shaft gears 102 and 104 are assembled on the small-diameter left and right sections, and the shaft sleeve 107 is located on the input shaft 101 between the first rolling bearing 103 and the input shaft gears 102 and 104; the input shaft retaining ring 106 is provided at both ends of the input shaft 101, and the first screw 105 is assembled on the input shaft retaining ring 106.

[0044] In this embodiment, referring to Figure 14, the diameter of the middle shaft section of the input shaft 101 is the largest, and the first rolling bearings 103, the mounting steps for the input shaft gears 102 and 104 are arranged on both sides in sequence; after the first rolling bearings 103 are assembled onto the input shaft 101 from both ends, the bushing 107 is assembled onto the input shaft 101, and then the input shaft gears 102 and 104 are respectively assembled from both ends. The connection between the input shaft gears 102 and 104 and the input shaft 101 can select spline or flat key connection according to the power of the fracturing pump; after the power input components at both ends of the input shaft 101 are assembled, the input shaft retaining rings 106 are fixed on the input shaft 101 with the first screws 105 at both ends of the input shaft 101 respectively.

[0045] The input shaft assembly 100 is installed in the first bearing seat 802 of the pump body 800 through the first rolling bearings 103.

[0046] Embodiment 4 This embodiment is further elaborated on the basis of Embodiment 3, as Figure 15 shown, the crankshaft assembly 300 includes a flange 301, a crankshaft 302, second rolling bearings 303, second screws 304, split retaining rings 305, shaft end retaining rings 306 and third screws 307; The flange 301 is assembled at both ends of the crankshaft 302, the shaft end retaining ring 306 is assembled on the flange 301 and the third screw 307 is arranged thereon; a plurality of second rolling bearings 303 are provided and assembled on the crankshaft 302. The crankshaft assembly 300 is installed in the pump body 800 through the plurality of second rolling bearings 303, and the split retaining ring 305 is assembled at both ends of the second rolling bearing 303 and the second screw 304 is arranged thereon.

[0047] In this embodiment, referring to Figure 15 and 16 , the structure of the crankshaft 302 is the same as that of the traditional fracturing pump; the crankshaft assembly 300 is installed in the main bearing seat 806 of the pump body 800 through a plurality of second rolling bearings 303, and the second rolling bearings 303 are fixed on the pump body 800 by using a bearing cover 807 and third bolts 808.

[0048] Embodiment 5 This embodiment is further elaborated on the basis of Embodiment 4, as Figure 5 , 6 and 7 shown, the rocker 400 includes a rocker body 401, a rod end cover 402 and a first bolt 403; The lower part of the rocker body 401 is a U-shaped structure and is provided with a lower pin hole, and the upper part is provided with an upper pin hole; the contact position between the middle part of the rocker body 401 and the split slider 500 is set as a groove, and the contact surface between the groove and the split slider 500 is a cylindrical surface; The rod end cover 402 adopts a groove structure and is fixed at the groove of the rocker body 401 by the first bolt 403. The two grooves are opposite to form a slider guide groove; the contact surface between the groove of the rod end cover 402 and the split slider 500 is a cylindrical surface, and has the same radius as the cylindrical surface where the rocker body 401 contacts the split slider 500 and the centers coincide after assembly.

[0049] In this embodiment, referring to Figures 5 to 7 , the lower part of the rocker body 401 is of a U-shaped structure, and a lower pin hole is provided and connected to the pin shaft 701 in the integral slider 700. An upper pin hole is provided in the upper part of the rocker body 401 and connected to the rocker shaft 19 fixedly installed on the pump body 800. The rocker 400 can rotate around the rocker shaft 19. The weights of the rocker 400 and the integral slider 700 are borne by the rocker shaft 19, avoiding the partial weight of the connecting rod in the traditional crank and connecting rod mechanism of the fracturing pump acting on the crosshead, and reducing the friction force of the crosshead 600 in the slipper 9; the contact position between the middle part of the rocker body 401 and the split slider 500 is set as a shallow groove, so that the middle part of the rocker body 401 has a larger cross-sectional dimension to bear a larger load, and the contact surface between the groove and the split slider 500 is designed as a cylindrical surface; the rod end cover 402 also adopts a groove structure, the contact surface between the groove and the split slider 500 is designed as a cylindrical surface, and has the same radius as the cylindrical surface where the rocker body 401 contacts the split slider 500 and the centers coincide after assembly; during the assembly process, after the split slider 500 is placed in the middle groove of the rocker body 401, the rod end cover 402 is fixed to the rocker body 401 by the first bolt 403; when the fracturing pump discharges liquid, a large working resistance needs to be overcome. At this time, the crankshaft 302 pushes the rocker 400 to swing through the split slider 500, and the thrust is transmitted through the cylindrical surface where the split slider 500 contacts the rocker body 401. The shallow groove design on the rocker body 401 enables the rocker body 401 to have a great ability to bear the thrust; when sucking liquid, the working resistance to be overcome is very small, and the acting force is transmitted through the cylindrical surface where the split slider 500 contacts the rod end cover 402 and pulls the rocker 400 to swing. Therefore, the rod end cover 402 only needs a relatively light structure and size.

[0050] Embodiment 6 This embodiment is further elaborated on the basis of Embodiment 5. As Figure 8 shown, the split slider 500 includes a slider body 501, a slider cover 502 and a second bolt 503; The slider cover 502 covers the slider body 501 and is fixed by the second bolt 503. Half holes are provided on both the slider body 501 and the slider cover 502. After being covered, the two half holes form a crankshaft horizontal through hole, and a bearing installation groove is provided in the crankshaft horizontal through hole; on the side surfaces of the slider body 501 and the slider cover 502 at the contact parts with the rocker 400, cylindrical surfaces with the same radius as the cylindrical surface on the rocker 400 are provided; A self-aligning bearing is installed in the bearing installation groove, and a clearance is reserved between the cylindrical surfaces of the contact parts of the split slider 500 and the rocker 400.

[0051] In this embodiment, referring to Figure 8 , the contact parts of the slider body 501, the slider cover 502 and the rocker 400 are designed as cylindrical surfaces with the same radius; grooves are opened on the inner half holes of the slider body 501 and the slider cover 502 to install the self-aligning bearing; during processing, the slider body 501 and the slider cover 502 are assembled into a whole with the second bolt 503 to machine the outer cylindrical surface, the inner hole and the groove; during the assembly of the fracturing pump, first install the self-aligning bearing on the crank pin of the crankshaft 302, and then snap the inner hole groove of the slider body 501 and the slider cover 502 onto the outer ring of the bearing and fasten it with the second bolt 503. The outer ring of the bearing also plays an axial positioning role for the slider body 501 and the slider cover 502, so that there is no need to set up additional positioning structures between the slider body 501 and the slider cover 502; if the self-aligning bearing used is a rolling bearing, the inner hole grooves of the slider body 501 and the slider cover 502 adopt cylindrical surfaces, and if the self-aligning bearing used is a sliding bearing, the inner hole grooves of the slider body 501 and the slider cover 502 can adopt spherical structures; a self-aligning bearing is used between the split slider 500 and the crank pin of the crankshaft 302, which can better meet the geometric tolerances between the crankshaft assembly 300 and the rocker 400.

[0052] The nominal dimensions of the radii of the cylindrical surfaces of the contact parts of the rocker 400 and the split slider 500 are the same, and at the same time, a certain clearance is ensured between the cylindrical surfaces of the rocker 400 and the split slider 500 in contact, so that the split slider 500 can rotate relative to the rocker body 401 with the center of the contact cylindrical surface, and at the same time can move along the center direction of the cylindrical surface. This design of cylindrical surface contact enables the split slider 500 to perform axial positioning without setting a positioning device on the crank pin of the crankshaft 3.

[0053] Embodiment 7 This embodiment is further elaborated on the basis of Embodiment 6, as shown in Figure 9 , 10 and 11, the crosshead 600 includes a crosshead body 601, a head body end cover 602 and an inner hexagon screw 603; The end of the crosshead body 601 is in an inverted T-shaped structure, and the bottom surface of the inverted T-shaped structure is a cylindrical surface in contact with the slipper 9; a U-shaped groove is opened in the middle of the crosshead body 601, and the head body end cover 602 is covered in the U-shaped groove through the inner hexagon screw 603 to form an integral slider installation cavity, and a cylindrical surface adapted to the integral slider 700 is arranged in the integral slider installation cavity.

[0054] In this embodiment, referring to Figures 9 to 11, viewed from the end of the crosshead body 601, its shape is an inverted T-shaped structure. The lower part has a large contact area with the slipper 9. The gravity of the crosshead acts on the large contact area at the lower part, which can reduce the pressure per unit area and reduce wear. A U-shaped groove is provided in the middle of the crosshead body 601. The cross-sectional shape of the groove is composed of two parts of the same cylindrical surface, which can be formed by turning or milling at one time, with convenient processing and high processing accuracy. After the inner cylindrical surface of the head body end cover 602 is fitted with the cylindrical surface of the crosshead body 601 where the threaded hole is provided in the upper part of the U-shaped groove, it is fastened to the crosshead body 601 with an internal hexagonal screw, and then the cylindrical surface of the crosshead 600 in contact with the slipper 9 is integrally finish-machined.

[0055] Example 8 This embodiment is further elaborated on the basis of Embodiment 7, as Figure 12 and 13 shown, the overall slider 700 includes a pin shaft 701, an overall slider body 702, an overall slider retaining ring 703, and a fourth screw 704; The overall slider body 702 is slidably assembled in the overall slider installation cavity. The part of the overall slider body 702 in contact with the crosshead body 601 is a cylindrical surface, and its radius is the same as the nominal size of the cylindrical surface of the contact part of the U-shaped groove of the crosshead body 601, and a gap is reserved between the two contact cylindrical surfaces. A cylindrical hole is provided in the middle of the overall slider body 702. The pin shaft 701 passes through the cylindrical hole, and a sliding bearing or a rolling bearing is used for the assembly between the middle cylindrical hole of the overall slider body 702 and the pin shaft 701; The length of the pin shaft 701 is shorter than the outer width of the U-shaped structure at the lower part of the rocker body 401. The pin shaft 701 passes through the pin hole at the lower part of the rocker body 401. After the overall slider retaining ring 703 is fixed to both ends of the pin shaft 701 with the fourth screw 704 respectively, the overall slider retaining ring 703 generates a pressing force on the outside of the U-shaped structure at the lower part of the rocker body 401, and the pin shaft 701 and the rocker body 401 are fixed together.

[0056] In this embodiment, refer to Figures 12 to 13, the part of the integral slider body 702 in contact with the crosshead body 601 is designed as a cylindrical surface, and the radius of this cylindrical surface is the same as the nominal dimension of the cylindrical surface at the contact part of the U-shaped groove of the crosshead body 601, and there is a certain gap between the two contact cylindrical surfaces, so that the contact part can rotate relatively around the center of the cylindrical surface; a cylindrical hole is opened in the middle part of the integral slider body 702. When connecting with the pin hole at the lower part of the rocker body 401, the integral slider body 702 is clamped into the U-shaped structure at the lower part of the rocker body 401, and then the pin shaft 701 is passed through the pin hole at the lower part of the rocker body 401 and the cylindrical hole in the middle of the integral slider body 702, and then the integral slider retaining ring 703 is fixed to both ends of the pin shaft 701 with the fourth screw 704 respectively; the length of the pin shaft 701 is slightly shorter than the outer width of the U-shaped structure at the lower part of the rocker body 401. When the integral slider retaining ring 703 is fixed, it simultaneously generates a pressing force on the outside of the U-shaped structure at the lower part of the rocker body 401, and the pin shaft 701 and the rocker body 401 are fixed together; a sliding bearing or a rolling bearing is adopted between the cylindrical hole in the middle of the integral slider body 702 and the pin shaft 701, so that the integral slider body 702 can rotate around the center of the pin shaft 701.

[0057] Embodiment 9 This embodiment is further elaborated on the basis of Embodiment 8, as Figure 16 shown, the pump body 800 includes a pump head fixing plate 801, a first bearing seat 802, a side plate 803, a bracket 804, a second bearing seat 805, a main bearing seat 806, a bearing cover 807, a third bolt 808, a bottom plate 809, a rear side plate 810, a lower fixing seat 811, an inclined bottom plate 812, an upper fixing seat 813, a top plate 814 and a front side plate 815; The pump head fixing plate 801, the bracket 804, the front side plate 815, the rear side plate 810, the side plate 803, the top plate 814, and the bottom plate 809 are respectively located at the head, the bottom of the head, the front side, the rear side, the left and right sides, the top, and the bottom of the pump body 800; The first bearing seat 802 is located behind the pump head fixing plate 801 and is used for assembling the first rolling bearing 103 of the input shaft assembly 100; the second bearing seat 805 is located behind and above the first bearing seat 802 and is used for assembling the bearing of the rocker shaft 19; the main bearing seat 806 is located in the middle of the pump body 800 and is used for installing the second rolling bearing 303 of the crankshaft assembly 300, and the bearing cover 807 is installed on the main bearing seat 806 through the third bolt 808; The lower fixing seat 811 is located in front of the rear side plate 810, the inclined bottom plate 812 is located below the main bearing seat 806, and the upper fixing seat 813 is located in front of the main bearing seat 806.

[0058] In this embodiment, except for the bearing cover 807 and the third bolt 808, all other parts are connected by welding; the number of side plates 803 is one more than the number of cylinders of the fracturing pump, and they have the same structure; rectangular holes are opened at the lower positions of the welded group bearing seats 806 on the side plates 803 to facilitate the assembly and disassembly of the slippers 9, pin shafts 701, retaining rings 703, and fourth screws 704.

[0059] After welding is completed, the arcs on the lower fixed seat 811 and the upper fixed seat 813 are finely machined, and it is ensured that the lower fixed seat 811 and the upper fixed seat 813 have a certain coaxiality; after the main bearing seat 806 and the bearing cover 807 are assembled with the third bolt 808, the inner hole thereof is finely machined; the inner holes of the first bearing seat 802 and the second bearing seat 805 are also finely machined.

[0060] Embodiment 10 . A long-stroke fracturing pump, as Figure 2 shown, includes a power end of the long-stroke fracturing pump, as well as a connecting rod 10, a clamp 11, a piston rod 12, a piston 13, a pump head 14, a suction valve 15, a suction pipe 16, a discharge pipe 17, and a discharge valve 18; The crosshead 600 at the power end of the long-stroke fracturing pump is connected to the connecting rod 10, the connecting rod 10 is connected to the piston rod 12 through the clamp 11, the piston rod 12 is connected to the piston 13, the piston 13 is arranged inside the pump head 14, the pump head 14 is connected with a suction pipe 16 and a discharge pipe 17, and the suction valve 15 and the discharge valve 18 are respectively arranged on the suction pipe 16 and the discharge pipe 17.

[0061] In this embodiment, the structures of the connecting rod 10, the clamp 11, the piston rod 12, the piston (or plunger) 13, the pump head 14, the suction valve 15, the discharge valve 18, the liquid inlet pipe 16, and the liquid discharge pipe 17 and the connection manners therebetween are the same as those of the existing fracturing pump.

[0062] The power end of the long-stroke fracturing pump and the fracturing pump in this embodiment can adopt a three-cylinder, five-cylinder, or seven-cylinder arrangement.

[0063] The structural principle of the power end of the long-stroke fracturing pump in this embodiment can also be applied to other reciprocating pumps, and a two-cylinder, four-cylinder, or six-cylinder arrangement can also be adopted.

[0064] The above has specifically described the embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalents or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. A power end of a long-stroke fracturing pump, characterized in that, It includes an input shaft assembly (100), a crankshaft gear (2, 20), a crankshaft assembly (300), a rocker (400), a split slider (500), a crosshead (600), a solid slider (700), a pump body (800), a slipper (9) and a rocker shaft (19); The input shaft assembly (100) and the crankshaft assembly (300) are both rotationally assembled on the pump body (800), and the crankshaft gears (2, 20) are assembled at both ends of the crankshaft assembly (300) and mesh with the input shaft assembly (100); The upper part of the rocker (400) is rotationally installed on the pump body (800) through the rocker shaft (19), a split groove is provided in the middle, and the lower part is connected to the solid slider (700); the inner hole of the split slider (500) is assembled on the crank of the crankshaft assembly (300), and the outer surface is slidably assembled in the split groove of the rocker (400); the solid slider (700) is connected to the crosshead (600), the slipper (9) is assembled on the pump body (800), and the crosshead (600) is slidably assembled on the slipper (9); The input shaft assembly (100) rotates under the drive of the input power, drives the crankshaft assembly (300) to rotate through the meshing crankshaft gears (2, 20), the rotation of the crankshaft assembly (300) drives the split slider (500) to slide in the split groove of the rocker (400), drives the rocker (400) to swing reciprocally around the rocker shaft (19), and drives the solid slider (700) and the crosshead (600) at the bottom of the rocker (400) to reciprocate on the slipper (9) to provide the reciprocating power of the fracturing pump; During the swinging process of the rocker (400), the stroke of the reciprocating movement in the horizontal direction at the connection part between the lower part and the solid slider (700) is greater than the stroke of the horizontal reciprocating movement at the contact part between the middle part of the rocker (400) and the split slider (500).

2. The power end of the long-stroke fracturing pump according to claim 1, characterized in that During one cycle of the reciprocating movement of the crosshead (600), the angle of rotation of the crankshaft assembly (300) when pushing the piston for the liquid discharge stroke is not equal to the angle of rotation of the crankshaft assembly (300) when pulling the piston for the liquid suction stroke, and the angle of rotation during the liquid discharge stroke is greater than the angle of rotation during the liquid suction stroke.

3. The power end of the long-stroke fracturing pump according to claim 1, characterized in that The input shaft assembly (100) includes an input shaft (101), input shaft gears (102, 104), a first rolling bearing (103), a first screw (105), an input shaft retaining ring (106) and a bushing (107); The input shaft (101) includes a large-diameter middle section and small-diameter left and right sections. The first rolling bearings (103) are assembled at both ends of the large-diameter section, and the input shaft assembly (100) is installed in the pump body (800) through the first rolling bearings (103); the input shaft gears (102, 104) are assembled on the small-diameter left and right sections, and the shaft sleeve (107) is located on the input shaft (101) between the first rolling bearings (103) and the input shaft gears (102, 104); the input shaft retaining rings (106) are arranged at both ends of the input shaft (101), and the first screws (105) are assembled on the input shaft retaining rings (106).

4. The power end of the long-stroke fracturing pump according to claim 1, characterized in that The crankshaft assembly (300) includes a flange (301), a crankshaft (302), second rolling bearings (303), second screws (304), split retaining rings (305), shaft-end retaining rings (306) and third screws (307); The flange (301) is assembled at both ends of the crankshaft (302), and the shaft-end retaining rings (306) are assembled on the flange (301) and the third screws (307) are arranged thereon; a plurality of second rolling bearings (303) are provided and assembled on the crankshaft (302), and the crankshaft assembly (300) is installed in the pump body (800) through the plurality of second rolling bearings (303). The split retaining rings (305) are assembled at both ends of the second rolling bearings (303) and the second screws (304) are arranged thereon.

5. The power end of the long-stroke fracturing pump according to claim 1, characterized in that, The rocker (400) includes a rocker body (401), a rod-end cover (402) and a first bolt (403); The lower part of the rocker body (401) is of a U-shaped structure and is provided with lower pin holes, and the upper part is provided with upper pin holes; the contact position between the middle part of the rocker body (401) and the split slider (500) is provided with a groove, and the contact surface between the groove and the split slider (500) is a cylindrical surface; The rod-end cover (402) adopts a groove structure and is fixed at the groove of the rocker body (401) through the first bolt (403). The two grooves are opposite to form a slider guide groove; the contact surface between the groove of the rod-end cover (402) and the split slider (500) is a cylindrical surface, and has the same radius as the cylindrical surface of the contact between the rocker body (401) and the split slider (500) and the centers coincide after assembly.

6. The power end of the long-stroke fracturing pump according to claim 5, characterized in that, The split slider (500) includes a slider body (501), a slider cover (502) and a second bolt (503); The slider cover (502) covers the slider body (501) and is fixed by the second bolt (503). Half holes are provided on both the slider body (501) and the slider cover (502). After covering, the two half holes form a crankshaft transverse through hole, and a bearing mounting groove is arranged in the crankshaft transverse through hole; the contact parts of the sides of the slider body (501) and the slider cover (502) with the rocker (400) are both provided with cylindrical surfaces having the same radius as the cylindrical surface on the rocker (400); A self-aligning bearing is installed in the bearing mounting groove, and a gap is reserved between the cylindrical surfaces of the contact parts of the split slider (500) and the rocker (400).

7. The power end of the long-stroke fracturing pump according to claim 5, characterized in that The crosshead (600) includes a crosshead body (601), a head body end cover (602), and an internal hexagonal screw (603); The end of the crosshead body (601) is in an inverted T-shaped structure, and the bottom surface of the inverted T-shaped structure is a cylindrical surface that contacts the slipper (9); a U-shaped groove is provided in the middle of the crosshead body (601), and the head body end cover (602) is covered in the U-shaped groove through the internal hexagonal screw (603) to form an integral slider installation cavity, and a cylindrical surface adapted to the integral slider (700) is provided in the integral slider installation cavity.

8. The power end of the long-stroke fracturing pump according to claim 7, wherein The integral slider (700) includes a pin shaft (701), an integral slider body (702), an integral slider retaining ring (703), and a fourth screw (704); The integral slider body (702) is slidably assembled in the integral slider installation cavity. The part of the integral slider body (702) in contact with the crosshead body (601) is a cylindrical surface, and its radius is the same as the nominal dimension of the cylindrical surface at the contact part of the U-shaped groove of the crosshead body (601), and a gap is reserved between the two contact cylindrical surfaces; a cylindrical hole is provided in the middle of the integral slider body (702), and the pin shaft (701) passes through the cylindrical hole. A sliding bearing or a rolling bearing is used for assembly between the cylindrical hole in the middle of the integral slider body (702) and the pin shaft (701); The length of the pin shaft (701) is shorter than the outer width of the U-shaped structure at the lower part of the rocker body (401). The pin shaft (701) passes through the pin hole at the lower part of the rocker body (401). After the integral slider retaining ring (703) is fixed to both ends of the pin shaft (701) with the fourth screw (704) respectively, the integral slider retaining ring (703) generates a pressing force on the outside of the U-shaped structure at the lower part of the rocker body (401), and the pin shaft (701) and the rocker body (401) are fixed together.

9. The power end of the long-stroke fracturing pump according to claim 1, characterized in that, The pump body (800) includes a pump head fixing plate (801), a first bearing seat (802), a side plate (803), a bracket (804), a second bearing seat (805), a main bearing seat (806), a bearing cover (807), a third bolt (808), a bottom plate (809), a rear side plate (810), a lower fixing seat (811), an inclined bottom plate (812), an upper fixing seat (813), a top plate (814), and a front side plate (815); The pump head fixing plate (801), the bracket (804), the front side plate (815), the rear side plate (810), the side plate (803), the top plate (814), and the bottom plate (809) are respectively located at the head, the bottom of the head, the front side, the rear side, the left and right sides, the top, and the bottom of the pump body (800); The first bearing housing (802) is located behind the pump head fixing plate (801) and is used for assembling the first rolling bearing (103) of the input shaft assembly (100); the second bearing housing (805) is located above and behind the first bearing housing (802) and is used for assembling the bearing of the rocker shaft (19); the main bearing housing (806) is located in the middle of the pump body (800) and is used for installing the second rolling bearing (303) of the crankshaft assembly (300), and the bearing cover (807) is installed on the main bearing housing (806) through the third bolt (808); The lower fixing seat (811) is located in front of the rear side plate (810), the inclined bottom plate (812) is located below the main bearing housing (806), and the upper fixing seat (813) is located in front of the main bearing housing (806).

10. A long-stroke fracturing pump, characterized in that, It includes the power end of the long-stroke fracturing pump according to any one of claims 1-10, as well as the connecting rod (10), the clamp (11), the piston rod (12), the piston (13), the pump head (14), the suction valve (15), the suction pipe (16), the discharge pipe (17) and the discharge valve (18); The crosshead (600) of the power end of the long-stroke fracturing pump is connected to the connecting rod (10), the connecting rod (10) is connected to the piston rod (12) through the clamp (11), the piston rod (12) is connected to the piston (13), the piston (13) is arranged in the pump head (14), the pump head (14) is connected with the suction pipe (16) and the discharge pipe (17), and the suction valve (15) and the discharge valve (18) are respectively arranged on the suction pipe (16) and the discharge pipe (17).

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