CN111749863A - A seven-cylinder plunger pump - Google Patents

Abstract

The invention discloses a seven-cylinder plunger pump. The crankshaft of the seven-cylinder plunger pump has seven cranks, seven plungers, and seven cylinders in a valve box. The box reciprocates, and each piston is powered by the rotation of a crank. Beneficial effects: Compared with the five-cylinder plunger pump under the same rotational speed and stroke conditions of the seven-cylinder structure, the seven-cylinder plunger pump has higher displacement, higher pressure, and lower discharge pulsation, which meets the requirements of large displacement and high pressure in the well site. need.

Description

A seven-cylinder plunger pump

technical field

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

Background technique

With the continuous development of oil and gas fields, the development of ultra-high pressure, ultra-deep wells and horizontal wells is becoming more and more difficult, and the fracturing operation conditions are getting worse and worse, especially unconventional fracturing - shale gas fracturing, fracturing The scale of construction operations continues to increase, requiring high-pressure, large-displacement, and continuous operation of fracturing equipment. The reciprocating plunger pump is the core equipment in the fracturing process. The current oil and gas field fracturing operation reciprocating plunger pump equipment mostly adopts a five-cylinder structure, and most of them use a single crankshaft and multiple sets of connecting rod crossheads to form the power end, driving The hydraulic end plunger pump completes the reciprocating motion, and its power end and the main structure of the pump are mostly arranged on one side of the input end. With the increase of the power of the plunger pump, the vibration problem during the operation of the reciprocating pump arranged on one side relative to the input end becomes more and more prominent. Therefore, it is necessary to propose a new solution to meet the ever-increasing demand for power and displacement, while improving the Dynamic balance performance of the power end. When the five-cylinder plunger pump is working, the suction and discharge process of the working liquid medium is alternately carried out by the discharge pulsation, resulting in uneven flow fluctuation, and there is a pulsation shock during work, especially when the pulsation increases with large displacement, which not only increases the noise and shock , and reduce the service life of the plunger pump and its accessories.

Under the condition that the total pressure of the well site is constant, the smaller the power displacement of a single fracturing equipment, the more fracturing equipment the well site needs to meet the demand of total pressure. At present, the area of the well site for oil and gas exploitation is required to be smaller and smaller, and reducing the number of fracturing equipment is one of the effective means; the actual well site access is also more rugged. The longer the well site layout time, the more time-consuming and laborious has become more and more urgent.

Therefore, a large displacement and high pressure plunger pump is urgently needed, which can meet the requirements of different working conditions and can also meet the requirements of different fracturing operation forms.

SUMMARY OF THE INVENTION

The object of the present invention overcomes the deficiencies of the prior art, and provides a seven-cylinder plunger pump. Compared with the five-cylinder plunger pump under the same rotational speed and stroke condition of the seven-cylinder structure, the seven-cylinder plunger pump has higher displacement and higher pressure. Larger and lower discharge pulsation, meeting the needs of large displacement and high pressure in the well site.

The object of the present invention is achieved by the following technical measures: a seven-cylinder plunger pump, the crankshaft of the seven-cylinder plunger pump has 7 cranks, the plunger has 7, the valve box has 7 cylinders, and each piston has 7 crankshafts. Corresponding to 1-cylinder valve box and reciprocating in the valve box, each piston is powered by the rotation of a crank.

Further, the seven-cylinder plunger pump includes a power end assembly, a hydraulic end assembly and a gear transmission mechanism, the power end assembly and the hydraulic end assembly are connected by bolts, and the gear transmission mechanism is used for the power end assembly. into the power input.

Further, the power end assembly includes a power end casing, a crankshaft assembly and a connecting rod crosshead assembly, the crankshaft assembly and the connecting rod crosshead assembly are arranged inside the power end casing, and the crankshaft assembly and the connecting rod crosshead assembly are arranged inside the power end casing. The connecting rod crosshead assembly is connected, the hydraulic end assembly includes a plunger and a valve box, one end of the piston reciprocates in the valve box, the other end of the piston is connected with the connecting rod crosshead assembly, and the power end The casing includes a crankshaft case, a crosshead case, a large gear shaft case and a pinion shaft case, and the crankshaft case is respectively connected with the crosshead case, the large gear shaft case and the pinion shaft case.

Further, the power end housing is integrally welded.

Further, the crankshaft assembly includes a crankshaft, a crankshaft bearing and a large gear shaft, the crankshaft includes a crankshaft and a crankshaft, the crankshaft and the crankshaft are connected, the crankshaft bearing is sleeved on the crankshaft, and there are two large gear shafts. , 2 large gear shafts are located at both ends of the crankshaft.

Further, the two large gear shafts and the crankshaft are of an integral structure.

Further, the gear transmission mechanism includes a pinion shaft, a large gear and a pinion bearing, and there are two large gears. The two large gears are respectively arranged at both ends of the crankshaft, and one large gear and one large gear shaft. Corresponding to the socket connection, one end of the pinion shaft is provided with a spline and a left-handed gear, and the other end of the pinion shaft is provided with a right-handed gear. The pinion shaft is connected with the power end housing through the pinion bearing.

Further, the large gear shafts at both ends of the crankshaft extend into the large gear shaft case along the length direction, the large gear is arranged in the large gear shaft case, the large gear shaft case is two, and the two large gears The axle housings are respectively arranged on both sides of the crank housing.

Further, the pinion bearing is a cylindrical spherical roller bearing.

Further, the number of the pinion shaft casings is two, the two pinion shaft casings are respectively arranged on both sides of the crankcase body, and the two ends of the pinion shaft respectively extend into the pinion shaft along the length direction. The box body, the left-handed gear and the right-handed gear of the pinion shaft are respectively arranged in two pinion shaft boxes, the spline of the pinion shaft is arranged on the outside of the pinion shaft box, and the pinion shaft is connected with the external power through the spline. source connection.

Compared with the prior art, the beneficial effects of the present invention are:

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

Description of drawings

1 is a schematic structural diagram of a seven-cylinder plunger pump of the patent;

Fig. 2 is a schematic diagram of the internal structure of a seven-cylinder plunger pump of the patent;

Fig. 3 is the schematic diagram of the gear transmission mechanism of the patent;

Fig. 4 is the structural schematic diagram of the crankshaft and the large gear shaft of the patent;

Figure 5 is a schematic diagram of the pinion shaft of the patent;

FIG. 6 is a schematic diagram of the structure of the power end housing of the patent;

FIG. 7 is a schematic structural diagram of the hydraulic end assembly of the patent.

Among them, 1. Power end assembly, 2. Hydraulic end assembly, 3. Gear transmission mechanism, 4. Power end housing, 5. Crankshaft assembly, 6. Connecting rod crosshead assembly, 7. Plunger, 8. Valve box, 9. Pinion shaft, 10. Large gear, 11. Pinion bearing, 12. Crankshaft, 13. Crank, 14. Crank neck, 15. Large gear shaft, 16. Right-handed gear, 17. Left-handed gear, 18. Splines, 19. Crankshaft case, 20. Large gear shaft case, 21. Pinion shaft case, 22. Crosshead case.

Detailed ways

As shown in Figures 1 to 7, a seven-cylinder plunger pump, the crankshaft 12 of the seven-cylinder plunger pump has 7 cranks 13, the plunger 7 has 7, the valve box 8 has 7 cylinders, each piston Corresponding to 1-cylinder valve box 8 and reciprocating in the valve box 8, each piston is powered by the rotation of a crank 13 to provide reciprocating motion. Compared with the five-cylinder plunger pump and the triplex plunger pump under the same speed and stroke conditions, the seven-cylinder plunger pump has higher displacement, higher pressure and lower discharge pulsation, which can meet the large displacement of the well site. high stress demands. By increasing the displacement pressure of a single seven-cylinder plunger pump, the number of fracturing equipment in the fracturing wellsite can be effectively reduced, and the layout of the wellsite can be more convenient and simplified.

The seven-cylinder plunger pump includes a power end assembly 1, a hydraulic end assembly 2 and a gear transmission mechanism 3. The power end assembly 1 and the hydraulic end assembly 2 are connected by bolts, and the gear transmission mechanism 3 is used for Power input of power end assembly 1.

The power end assembly 1 includes a power end casing 4, a crankshaft assembly 5 and a connecting rod crosshead assembly 6, and the crankshaft assembly 5 and the connecting rod crosshead assembly 6 are arranged inside the power end casing 4, The crankshaft assembly 5 is connected with the connecting rod crosshead assembly 6. The hydraulic end assembly 2 includes a plunger 7 and a valve box 8. One end of the plunger 7 reciprocates in the valve box 8, and the other end of the plunger 7 reciprocates in the valve box 8. One end is connected with the connecting rod crosshead assembly 6. The power end housing 4 includes a crankcase 19, a crosshead case 22, a large gear shaft case 20 and a pinion shaft case 21. The crankcase 19 is respectively connected to the The cross head case 22 , the large gear shaft case 20 and the pinion shaft case 21 are connected. The connecting rod crosshead assembly 6 includes a crosshead mechanism and a connecting rod mechanism. The crosshead mechanism is arranged in the crosshead case 22, and the crankshaft assembly 5 is arranged in the crankcase 19. Between the crankcase 19 and the crosshead case A connecting rod mechanism is arranged between 22 , one end of the connecting rod mechanism is connected with the crankshaft 12 , the other end of the connecting rod mechanism is connected with the crosshead mechanism, and the other end of the crosshead mechanism is connected with the plunger 7 .

The power end housing 4 is integrally welded. The structure strength of the power end assembly 1 is higher, and the support stability is better, the bearing deformation of the power end casing 4 can be effectively reduced, the overall vibration of the seven-cylinder plunger pump can be reduced, and the operation stability of the seven-cylinder plunger pump can be improved.

The crankshaft assembly 5 includes a crankshaft 12, a crankshaft bearing and a large gear shaft 15. The crankshaft 12 includes a crank crank 13 and a crank neck 14, the crank crank 13 and the crank neck 14 are connected, and there are seven crank cranks 13 and crank necks 14. There are 8 crankshafts, a crank 13 is arranged between two adjacent crank journals 14, a crankshaft bearing is sleeved on each crankshaft 14, the crankshaft 12 is connected to the crankcase 19 through the crankshaft bearing, and the large gear shaft 15 has 2 One and two large gear shafts 15 are respectively provided on both ends of the crankshaft 12 .

The two large gear shafts 15 and the crankshaft 12 are integral structures, which ensure good and stable transmission performance of the large gear shaft 15 to the crankshaft 12 under the condition that a larger displacement and higher pressure are required compared to the five-cylinder plunger pump. , which ensures a good and stable power output of the crankshaft 12 .

The gear transmission mechanism 3 includes a pinion shaft 9, a large gear 10 and a pinion bearing 11. There are two large gears 10. The two large gears 10 are respectively arranged at both ends of the crankshaft 12. A large gear shaft 15 is correspondingly sleeved, one end of the pinion shaft 9 is provided with a spline 18 and a left-handed gear 17, and the other end of the pinion shaft 9 is provided with a right-handed gear 16, and the pinion shaft 9 is respectively connected by a left-handed gear. 17 and the right-handed gear 16 mesh with two large gears 10 , and the pinion shaft 9 is connected to the power end housing 4 through the pinion bearing 11 .

The large gear shafts 15 at both ends of the crankshaft 12 extend into the large gear shaft case 20 along the length direction. The large gears 10 are arranged in the large gear shaft case 20. There are two large gear shaft cases 20. The large gear shaft housings 20 are respectively disposed on both sides of the crankshaft housing 19 . The pinion bearing 11 is a cylindrical spherical roller bearing. The number of the pinion shaft housings 21 is two, and the two pinion shaft housings 21 are respectively arranged on both sides of the crankshaft housing 19 , and both ends of the pinion shaft 9 extend into the pinion gears along the length direction respectively. The shaft box 21, the left-handed gear 17 and the right-handed gear 16 of the pinion shaft 9 are respectively arranged in the two pinion shaft boxes 21, and the splines 18 of the pinion shaft 9 are arranged on the outside of the pinion shaft box 21, The pinion shaft 9 is connected to an external power source through splines 18 . The gear transmission mechanism 3 drives the large gears 10 at both ends of the crankshaft 12 through the left-handed gear 17 and the right-handed gear 16 on the pinion shaft 9 at the same time. When each crank 13 drives a plunger 7 to rotate, compared with the triplex plunger pump and the five-cylinder plunger pump, the discharge pulsation of the hydraulic end assembly 2 is significantly reduced, and the flow pulsation is smaller, which can effectively reduce the seven-cylinder plunger pump. The vibration of each component of the plunger pump prolongs the service life of each component, and can also reduce the vibration impact of the entire manifold during fracturing operations, and can better meet the needs of high pressure and large displacement at the well site.

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

Claims (10)

1. A seven-cylinder plunger pump is characterized in that: the crankshaft of the seven-cylinder plunger pump is provided with 7 crank throws, the plungers are provided with 7 plungers, the valve box is provided with 7 cylinders, each piston corresponds to the valve box with 1 cylinder and reciprocates in the valve box, and the rotation of the 1 crank throw provides reciprocating motion power for each piston.

2. The seven-cylinder plunger pump of claim 1, wherein: the seven-cylinder plunger pump comprises a power end assembly, a hydraulic end assembly and a gear transmission mechanism, wherein the power end assembly is connected with the hydraulic end assembly through a bolt, and the gear transmission mechanism is used for power input of the power end assembly.

3. The seven-cylinder plunger pump of claim 2, wherein: the power end assembly includes power end casing, bent axle assembly and connecting rod cross head assembly establish inside power end casing, and bent axle assembly and connecting rod cross head assembly are connected, hydraulic end assembly includes plunger and valve box, and reciprocating motion is made in the valve box to the one end of piston, and the other end and the connecting rod cross head assembly of piston are connected, power end casing includes the crankcase, the cross head box, gear shaft box and pinion shaft box, the crankcase respectively with the cross head box, gear shaft box and pinion shaft box are connected.

4. The seven-cylinder plunger pump of claim 3, wherein: the power end shell is integrally welded.

5. The seven-cylinder plunger pump of claim 3, wherein: the crankshaft assembly comprises a crankshaft, crankshaft bearings and bull gear shafts, the crankshaft comprises a crank throw and a crank neck, the crank throw is connected with the crank neck, the crankshaft bearings are sleeved on the crank neck, the number of the bull gear shafts is 2, and the 2 bull gear shafts are respectively arranged at two ends of the crankshaft.

6. The seven-cylinder plunger pump of claim 5, wherein: 2 the gear shaft and the crankshaft are of an integral structure.

7. The seven-cylinder plunger pump of claim 5, wherein: gear drive includes pinion shaft, gear wheel and pinion bearing, the gear wheel has 2, and 2 gear wheels are established respectively at the both ends of bent axle, and 1 gear wheel corresponds with 1 gear wheel and cup joints, and the one end of pinion shaft is equipped with spline and left hand gear, and the other end of pinion shaft is equipped with right hand gear, the pinion shaft is respectively through left hand gear and right hand gear and 2 gear engagement, the pinion shaft passes through pinion bearing and power end shell connection.

8. The seven-cylinder plunger pump of claim 7, wherein: the bull gear axle at bent axle both ends extends along length direction and gets into the bull gear axle box, the bull gear is established in the bull gear axle box, and the bull gear axle box is 2, 2 the bull gear axle box is established respectively in the both sides of bent axle box.

9. The seven-cylinder plunger pump of claim 7, wherein: the pinion bearing is a cylindrical self-aligning roller bearing.

10. The seven-cylinder plunger pump of claim 7, wherein: the pinion shaft box is 2, 2 the both sides at the crankcase body are established respectively to the pinion shaft box, the both ends of pinion shaft extend along length direction respectively and get into the pinion shaft box, and the levogyration gear and the dextrorotation gear of pinion shaft establish respectively in 2 pinion shaft boxes, and the spline of pinion shaft is established in the outside of pinion shaft box, and the pinion shaft passes through the spline and is connected with external power source.

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