WO2021051397A1

WO2021051397A1 - Five-cylinder plunger pump

Info

Publication number: WO2021051397A1
Application number: PCT/CN2019/107022
Authority: WO
Inventors: 崔海萍; 王继鑫; 崔文平; 魏小淞; 李朋; 李海龙
Original assignee: 烟台杰瑞石油装备技术有限公司
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2021-03-25

Abstract

Disclosed is a five-cylinder plunger pump, comprising a power end assembly (1), a fluid end assembly (2) and a reduction gearbox assembly (3). One end of the power end assembly (1) is connected to the fluid end assembly (2), and the other end of the power end assembly (1) is connected to the reduction gearbox assembly (3); the reduction gearbox assembly (3) comprises planetary reduction gearboxes (29, 31) and a parallel-stage reduction gearbox (30); the planetary reduction gearboxes (29, 31) cooperate with the parallel-stage reduction gearbox (30) for use; and the transmission ratio of the reduction gearbox assembly (3) is 60:1 to 106:1.

Description

A five-cylinder plunger pump

Technical field

The invention relates to the technical field of plunger pumps, in particular to a five-cylinder plunger pump.

Background technique

With the continuous development of ultra-high pressure, ultra-deep wells, and horizontal wells in oil and gas fields, their operating conditions have become more and more severe, requiring high-pressure and large-displacement operations. Therefore, the requirements for plunger pumps have become higher and higher. Cracking equipment can output high pressure and large displacement, so that the plunger pump is required to output high power and high pressure; especially in unconventional oil and gas operations-shale gas operations, the operating conditions are harsh and require long and large Displacement, high-pressure operations, and the frequency of operations are becoming more and more frequent, so the requirements for fracturing equipment are getting higher and higher, and the plunger pump is the core component of the fracturing equipment, so the requirements for the plunger pump are also increasing. The higher the turbine fracturing equipment, which is driven by a motor and powered by a turbine engine, its input power can reach 5600hp, and its input speed can reach 16000rpm. The current plunger pump on the market has a maximum power of 7000hp, but the highest input speed is Around 2100rpm, the general structure of the turbo fracturing equipment is to rely on the output power of the turbine engine. The output end of the turbine engine is connected to the high-speed heavy-duty reduction gearbox. The function of the high-speed heavy-duty reduction gearbox is mainly to reduce the high speed of the turbine engine to about 2100rpm. , And increase the output torque at the same time to achieve the effect of reducing speed and increasing torque; the output end of the high-speed and heavy-duty reduction box is connected with the transmission shaft, and the other end of the transmission shaft is connected with the reduction box on the plunger pump; the main function of the reduction box of the plunger pump It is to reduce the input speed from 2100rpm to several hundred revolutions; it also achieves the effect of reducing speed and increasing torque; in this way, the entire turbo fracturing equipment requires two reduction boxes and a transmission shaft; this will inevitably increase the weight of the entire vehicle and the entire vehicle The overall size of the vehicle affects the layout of the vehicle; therefore, it is necessary to develop a plunger pump with ultra-high speed and ultra-high power to match the turbo fracturing equipment.

Summary of the invention

The purpose of the present invention overcomes the shortcomings of the prior art and provides a five-cylinder plunger pump whose rated input power is increased to 5000-7000hp and can reach a stroke of 10-12in. The maximum input speed of the reduction box assembly on the plunger pump The increase from the existing 2100rpm to 16000rpm satisfies the deceleration requirements from the turbine engine to the plunger pump, that is, the gearbox can be directly connected with the turbine engine to solve the problem that the existing turbine fracturing equipment relies on two gearboxes to reduce speed. Reduce the weight of the vehicle and reduce the overall size of the equipment.

The purpose of the present invention is achieved through the following technical measures: a five-cylinder plunger pump, including a power end assembly, a hydraulic end assembly and a reduction box assembly, one end of the power end assembly and the hydraulic end assembly The other end of the power end assembly is connected with the reduction box assembly. The reduction box assembly includes a planetary reduction box and a parallel-stage reduction box. The planetary reduction box and the parallel-stage reduction box are used in conjunction with the transmission The ratio is 60:1—106:1.

Further, there are two planetary gearboxes, including a first planetary gearbox and a second planetary gearbox. One end of the first planetary gearbox is connected to the power end assembly, and the other end of the first planetary gearbox is connected to the parallel stage. The gearbox is connected, and the other end of the parallel-stage gearbox is connected with the second planetary gearbox.

Further, the planetary reduction gearbox includes a sun gear, four planetary gears and a gear ring. The four planetary gears form a planetary gear mechanism. The sun gear is located at the center of the planetary gear mechanism. The planetary gears are adjacent to the sun gear and gear ring. In a constant meshing state, the parallel-stage reduction gearbox includes a small gear and a large gear, the small gear is coaxial with the sun gear in the first planetary reduction gearbox, and the large gear is coaxial with the sun gear of the second planetary reduction gearbox.

Further, the other end of the power end assembly and the reduction box assembly are connected by a spline or a flexible coupling.

Further, the input angle of the reduction gearbox assembly can be adjusted according to input requirements.

Further, the power end assembly includes a crankcase, a crosshead case, and a spacer frame, one end of the crosshead case is connected to the crankcase body, and the other end of the crosshead case is connected to the spacer frame, The hydraulic end assembly is arranged at one end of the spacer frame, and is connected with the crankcase body through the spacer frame and the crosshead box body by bolts. The reduction gearbox assembly is connected with the crankcase body by bolts. The crankshaft in the crankcase body is made of alloy It is forged from steel and includes six journals and five crankshafts. A crank is arranged between two adjacent journals. The distance between the crankshaft and the center of rotation of the crankshaft is 120 to 160 mm.

Further, a crosshead mechanism is provided in the crosshead box, a connecting rod mechanism is arranged in the crankshaft case and the crosshead box, one end of the connecting rod mechanism is connected with the crankshaft, and the other end of the connecting rod mechanism is connected with the crosshead mechanism The connecting rod mechanism includes a connecting rod cover, a connecting rod bearing bush and a connecting rod body. The connecting rod cover and the connecting rod body are connected by bolts. The connecting rod bearing bush is located in the cylindrical space formed by the connecting rod cover and the connecting rod body. Both sides are flanging structures, and the wide-side structure has a large width-to-diameter ratio.

Compared with the prior art, the present invention has the beneficial effects of increasing the maximum input speed (to 16000rpm) by changing the transmission ratio of the gearbox assembly, and passing two gearboxes and one gearbox between the existing turbine engine and the pump. The connection mode of the drive shaft is shortened to the point that the turbine engine can be directly connected to the reduction box assembly on the pump, and it can also meet its speed reduction requirements, which simplifies the structure of the overall fracturing equipment, shortens the length, facilitates transportation, and reduces investment costs. Now, the maintenance is convenient. By optimizing the distance between the crankshaft and the center of rotation of the crankshaft, the maximum power of the plunger pump is increased to the current 5000-7000hp. Both sides of the connecting rod bearing bush are flanging structure, the flanging structure has a large width-to-diameter ratio, which can achieve high load-bearing capacity and good positioning effect. The input angle of the reduction box can be adjusted according to the input requirements, which can meet the multi-angle adjustment and adapt to various installation requirements.

The present invention will be described in detail below with reference to the drawings and specific embodiments.

Description of the drawings

Figure 1 is a schematic diagram of the structure of a five-cylinder plunger pump.

Figure 2 is a schematic diagram of the structure of the gearbox assembly.

Figure 3 is a schematic diagram of the structure of the power end assembly.

Figure 4 is a cross-sectional view of a five-cylinder plunger pump.

Fig. 5 is a cross-sectional view of the B-B and D-D directions (planetary reduction gearbox) in the schematic diagram of the structure of the reduction gearbox assembly.

Fig. 6 is a cross-sectional view of the C-C direction (parallel-stage gearbox) in the schematic diagram of the structure of the gearbox assembly.

Fig. 7 is a schematic diagram of the connection structure of the link mechanism and the crosshead mechanism.

Figure 8 is a schematic diagram of the crankshaft structure.

Among them, 1 power end assembly, 2 hydraulic end assembly, 3 reduction box assembly, 4 crankcase, 5 crosshead box, 6 spacer, 7 crankshaft, 8 journal, 9 crank, 10 cylindrical roller Sub-shaft, 11 valve box, 12 plunger, 13 bearing seat, 14 front end plate, 15 cover plate, 16 legs, 17 slide rail, 18 tie rod screw, 19 connecting rod cover, 20 connecting rod bearing, 21 connecting rod body, 22 cross head, 23 cross head gland, 24 cross head connecting screw, 25 cross head guide plate, 26 guide plate bolt, 27 tie rod, 28 clamp, 29 first planetary gear box, 30 parallel stage gear box, 31 second planetary gear box Box, 32 large gears, 33 small gears, 34 planetary gears, 35 gear rings, 36 sun gears.

detailed description

As shown in Figures 1 to 8, a five-cylinder plunger pump includes a power end assembly 1, a hydraulic end assembly 2 and a reduction box assembly 3. One end of the power end assembly 1 and the hydraulic end assembly The other end of the power end assembly 1 is connected to the reduction gearbox assembly 3. The reduction gearbox assembly 3 includes a planetary gearbox 29 and a parallel-stage gearbox 30, the planetary gearbox 29 and the parallel stage The gearbox 30 is used in conjunction, and its transmission ratio is 60:1—106:1. By changing the transmission ratio of the reduction box assembly 3, the maximum input speed is increased (to 16000 rpm), and the connection between the existing turbine engine and the pump is shortened to that the turbine engine can be directly connected to the pump through two reduction boxes and a drive shaft. The gearbox assembly 3 on the pump is connected to meet its speed reduction requirements, so that the overall fracturing equipment structure is simplified, the length is shortened, the transportation is convenient, the investment cost is reduced, and the maintenance is convenient.

There are two planetary gearboxes. The planetary gearboxes include a first planetary gearbox 29 and a second planetary gearbox 31. One end of the first planetary gearbox 29 is connected to the crankshaft 7 of the power end assembly. The first planetary gearbox The other end of 29 is connected with the parallel stage reduction box 30, the other end of the parallel stage reduction box 30 is connected with the second planetary reduction box 31, and the other end of the second planetary reduction box 31 is connected with the transmission shaft of the turbine engine. During work, the kinetic energy transmitted through the transmission shaft of the turbine engine is decelerated for the first time by the second planetary gearbox 31, the second deceleration is achieved by the parallel-stage gearbox 30, and finally the third deceleration is achieved by the first planetary gearbox 29.

The planetary reduction gearbox includes a sun gear 36, four planetary gears 34 and a gear ring 35. The four planetary gears 34 form a planetary gear mechanism. The sun gear 36 is located at the center of the planetary gear mechanism. The planetary gear 34 and the adjacent sun gear 36. The gear ring 35 is in a constant meshing state. The planetary gearbox adopts four evenly distributed planetary gears 34 to transmit motion and power at the same time. The centrifugal inertia force generated by the revolution of the four planetary gears 34 and the reaction force between the tooth profile The radial force components are balanced and offset each other, so that the force on the main shaft is reduced, and high power transmission is realized. The parallel-stage reduction box 30 includes a small gear 33 and a large gear 32. The small gear 33 is coaxial with the sun gear 36 in the first planetary reduction box 29, and the large gear 32 is coaxial with the sun gear 36 of the second planetary reduction box 31. . In the parallel-stage reduction box 30, it is transmitted to the large gear 32 via the pinion 33 to achieve deceleration.

The other end of the power end assembly 1 and the reduction box assembly 3 are connected by a spline or a flexible coupling.

The power end assembly 1 adopts a segmented structure design. The segmented design makes the overall structure of the power end assembly 1 compact and easier to manufacture. The assembly and subsequent maintenance of the entire pump are also more convenient, and it also reduces Processing cost. The power end assembly 1 includes a crankshaft case 4, a crosshead case 5 and a spacer 6, one end of the crosshead case 5 is connected to the crank case 4, and the other end of the crosshead case 5 is connected to The spacer frame 6 is connected, and the hydraulic end assembly 2 is arranged at one end of the spacer frame 6, and the bolts pass through the spacer frame 6, the crosshead box body 5 and the crankcase body 4 in turn, and the reduction box assembly 3 is connected to the crankshaft case body by bolts. 4 is connected, the crankshaft 7 in the crankcase 4 is forged from alloy steel, including six journals 8 and five crankshafts 9, and a crankshaft 9 is arranged between two adjacent journals 8, that is, five crankshafts. Cylinder structure design. The five-cylinder structure design increases the output displacement of the plunger pump. At the same time, compared with the three-cylinder pump, the five-cylinder pump works smoothly without vibration, which can reduce the vibration of the whole pump and extend the service life; the crank 9 The distance from the rotation center of the crankshaft 7 is 120 to 160 mm. By further studying the distance between the crankshaft 9 and the rotation center of the crankshaft 7, the maximum power of the plunger pump is increased to the current 5000-7000hp, which ensures that the plunger pump can output a higher pressure, which is to provide technical support for long strokes. The stroke can reach 10-12in. It can achieve large displacement operation requirements, while reducing pump strokes and increasing the service life of various parts.

The hydraulic end assembly 2 includes a valve box 11 and a plunger 12, the plunger 12 is arranged in the valve box 11, and the crankcase body 4 is welded by steel plates. It mainly consists of six bearing seats 13 and a front end plate 14, a cover plate. 15. The legs 16 are assembled and welded together. After the welding is completed, the bearing seat 13 and the front end plate 14 are processed by finishing. The crosshead box body 5 is welded by steel plates, the arc-shaped slide rail 17 is fixed on the crosshead box body 5, and the arc-shaped slide rail 17 is forged from alloy steel; the spacer 6 has an arched structural support column, Improve the support strength; through holes are left on the crosshead box body 5 and the spacer frame 6, and the hydraulic end valve box 11 is connected to the crankcase body 4 through the spacer frame 6, the crosshead box body 5 and the crankcase body 4 by bolts. A cylindrical roller shaft 10 is installed on the journal 8, and the outer ring of the cylindrical roller shaft 10 is installed on a bearing seat 13.

The crosshead box 5 is provided with a crosshead mechanism, the crankcase 4 and the crosshead box 5 are provided with a connecting rod mechanism, one end of the connecting rod mechanism is connected with the crankshaft 7, and the other end of the connecting rod mechanism is connected with the crosshead mechanism The connecting rod mechanism includes a connecting rod cover 19, a connecting rod bearing 20 and a connecting rod body 21. The connecting rod cover 19 and the connecting rod body 21 are connected by bolts, and the connecting rod bearing 20 is located in the connecting rod cover 19 and the connecting rod body 21 to form a connection In the cylindrical space, both sides of the connecting rod bearing bush 20 are flanging structures, and the wide-side structure has a large width-to-diameter ratio, which can achieve a high load-bearing capacity and a good positioning effect. The cross-head mechanism includes a cross-head 22, a cross-head gland 23, a cross-head connecting screw 24, a cross-head guide plate 25, a guide plate bolt 26, the cross-head 22 and the cross-head gland 23 are forged from alloy steel, and one end of the connecting rod mechanism is forged with alloy steel. The crank 9 is connected, and the other end is connected to the cross head 22 by the cross head gland 23 and the cross head connecting screw 24; the cross head guide plate 25 is fixed to the cross head 22 by the guide plate bolt 26, the cross head guide plate 25 is arc-shaped, and the surface There is an oil groove; the cross head 22 is connected to the plunger 12 of the hydraulic end assembly 2 through a tie rod 27 and a clamp 28, and further, the cross head 22 and the tie rod 27 are connected by a tie rod screw 18.

The input angle of the reduction box assembly 3 can be adjusted according to input requirements. It can meet multi-angle adjustment and adapt to various installation requirements.

The reduction box assembly 3 drives the crankshaft 7 to rotate, the crankshaft 7 rotates in the bearing supported by the bearing housing 13, the crankshaft 7 drives the connecting rod body 21, and the connecting rod body 21 drives the crosshead 22, which is in the crosshead box 5. The arc-shaped slide rail 17 reciprocates inside, and the crosshead 22 drives the plunger 12 through the pull rod 27 to reciprocate inside the valve box 11 of the hydraulic end assembly 2 to perform liquid suction and discharge.

Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have Various changes and improvements fall within the scope of the claimed invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

A five-cylinder plunger pump is characterized in that it comprises a power end assembly, a hydraulic end assembly and a reduction gear box assembly. One end of the power end assembly is connected to the hydraulic end assembly. The other end of the component is connected with a reduction gearbox assembly, which includes a planetary gearbox and a parallel-stage gearbox. The planetary gearbox and the parallel-stage gearbox are used together, and the transmission ratio is 60:1—106: 1.
The five-cylinder plunger pump according to claim 1, wherein there are two planetary reduction gearboxes, including a first planetary reduction gearbox and a second planetary reduction gearbox. One end of the first planetary reduction gearbox is combined with the power end. The other end of the first planetary gearbox is connected with the parallel-stage gearbox, and the other end of the parallel-stage gearbox is connected with the second planetary gearbox.
The five-cylinder plunger pump according to claim 2, characterized in that: the planetary reduction gearbox includes a sun gear, four planetary gears and a gear ring, the four planetary gears form a planetary gear mechanism, and the sun gear is located in the planetary gear. In the center of the mechanism, the planetary gears and the adjacent sun gears and gear rings are in constant meshing state. The parallel-stage reduction gearbox includes a small gear and a large gear. The small gear is coaxial with the sun gear in the first planetary reduction gearbox. The sun gear of the second planetary gearbox is coaxial.
The five-cylinder plunger pump according to claim 1, wherein the input angle of the reduction box assembly can be adjusted according to input requirements.
The five-cylinder plunger pump according to claim 1, wherein the other end of the power end assembly and the reduction box assembly are connected by a spline or a flexible coupling.
The five-cylinder plunger pump according to claim 1, wherein the power end assembly includes a crankcase, a crosshead case, and a spacer, and one end of the crosshead case is connected to the crankcase. The other end of the crosshead box body is connected to the spacer frame, the hydraulic end assembly is arranged at one end of the spacer frame, through the spacer frame, the crosshead box body is connected with the crankcase body by bolts, and the reduction box assembly is connected with the crankcase body by bolts. The crankcase body is connected. The crankshaft in the crankcase body is forged from alloy steel, including six journals and five crankshafts. A crankshaft is provided between two adjacent journals. The crankshaft is connected to the crankshaft. The center of rotation distance is 120 to 160mm.
The five-cylinder plunger pump according to claim 6, characterized in that: a crosshead mechanism is arranged in the crosshead box, a connecting rod mechanism is arranged in the crankcase and the crosshead box, and one end of the connecting rod mechanism is Connected with the crankshaft, the other end of the connecting rod mechanism is connected with the crosshead mechanism. The connecting rod mechanism includes a connecting rod cover, a connecting rod bearing bush and a connecting rod body. The connecting rod cover and the connecting rod body are connected by bolts, and the connecting rod bearing bush is located between the connecting rod cover and the connecting rod body. In the cylindrical space formed by the connecting rod body, both sides of the connecting rod bearing bush are flanging structures, and the wide-side structure has a large width-to-diameter ratio.