阅读说明：本技术 一种七缸柱塞泵 (Seven-cylinder plunger pump ) 是由 魏小淞 李海龙 王继鑫 李朋 崔文平 张树林 于 2020-07-25 设计创作，主要内容包括：本发明公开了一种七缸柱塞泵,所述七缸柱塞泵的曲轴有7个曲拐,柱塞有7个,阀箱有7缸,每个活塞对应1缸阀箱并在阀箱内作往复运动,每个活塞由1个曲拐的旋转提供往复运动的动力。有益效果：七缸结构相同转速及冲程工况下相对于五缸柱塞泵,七缸柱塞泵的排量更高、压力更大,排出脉动更低,满足井场大排量高压力的需求。(The invention discloses a seven-cylinder plunger pump, wherein a crankshaft of the seven-cylinder plunger pump is provided with 7 crank throws, plungers are provided with 7 cylinders, a valve box is provided with 7 cylinders, each piston corresponds to a 1-cylinder valve box and reciprocates in the valve box, and the rotation of the 1 crank throw provides reciprocating motion power for each piston. Has the advantages that: compared with a five-cylinder plunger pump under the working conditions of the same rotating speed and stroke of the seven-cylinder structure, the seven-cylinder plunger pump has higher discharge capacity, higher pressure and lower discharge pulsation, and meets the requirements of a well site for large discharge capacity and high pressure.)

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.

Technical Field

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

Background

Along with continuous development of oil and gas fields, development difficulty of ultrahigh pressure, ultra-deep wells and horizontal wells is increased, the working condition of fracturing construction operation is also increased, especially unconventional fracturing-shale gas fracturing, the scale of the fracturing construction operation is increased continuously, and high-pressure, large-displacement operation and continuous operation of fracturing equipment are required. The reciprocating plunger pump is a core device in the fracturing operation process, the reciprocating plunger pump device for the fracturing operation of the current oil-gas field mostly adopts a five-cylinder structure, most of the reciprocating plunger pumps adopt a single crankshaft and a plurality of sets of connecting rod crosshead to form a power end, the plunger pump at the hydraulic end is driven to complete reciprocating motion, and the power end and a pump main body structure are mostly arranged on one side of an input end. With the increase of the power of the plunger pump, the vibration problem in the operation process of the reciprocating pump arranged on the single side of the relative input end is more prominent, so that a new scheme needs to be provided, the requirements of continuously improved power and displacement are met, and the dynamic balance performance of the power end is improved. The five-cylinder plunger pump has the advantages that the flow fluctuation is uneven due to the fact that discharge pulsation is alternately performed in the process of sucking and discharging working liquid media when the five-cylinder plunger pump works, pulsation impact exists during work, particularly the pulsation is increased when the discharge amount is large, noise and impact are increased, and the service life of the plunger pump and accessories of the plunger pump is shortened.

Under the condition that the total pressure of a well site is certain, the smaller the power discharge capacity of a single fracturing device is, the more the number of the fracturing devices are needed in order to meet the requirement of the total pressure of the well site. At present, the occupied area of a well site for oil and gas exploitation is required to be smaller and smaller, and the reduction of the number of fracturing equipment is one of effective means; the actual well site access is also prone to be rugged, the more fracturing equipment, the longer the well site layout time is needed, the more time and labor are consumed, so the smaller the power discharge of single fracturing equipment is, the more contradiction between the well site floor area and the well site access is, and the aim of small well site operation is more urgent.

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

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the seven-cylinder plunger pump, and compared with a five-cylinder plunger pump under the working conditions of the same rotating speed and stroke of a seven-cylinder structure, the seven-cylinder plunger pump has higher discharge capacity, higher pressure and lower discharge pulsation, and meets the requirements of large discharge capacity and high pressure of a well site.

The aim of the invention is achieved by the following technical measures: a seven-cylinder plunger pump is characterized in that a crankshaft of the seven-cylinder plunger pump is provided with 7 crank throws, a plunger is provided with 7 plungers, a valve box is provided with 7 cylinders, each piston corresponds to a valve box with 1 cylinder and reciprocates in the valve box, and each piston is powered by the rotation of the 1 crank throw to reciprocate.

Furthermore, 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.

Further, power end assembly includes power end casing, bent axle assembly and connecting rod crosshead assembly establish inside power end casing, and bent axle assembly and connecting rod crosshead assembly are connected, hydraulic end assembly includes plunger and valve box, and reciprocating motion is made to the one end of piston in the valve box, and the other end and the connecting rod crosshead assembly of piston are connected, power end casing includes the crankcase, the crosshead box body, gear shaft box body and pinion shaft box body, the crankcase respectively with the crosshead box body, gear shaft box body and pinion shaft box body are connected.

Further, the power end shell is integrally welded.

Further, the bent axle assembly includes the bent axle, crankshaft bearing and bull gear axle, the bent axle includes crank throw and crank neck, and crank throw and crank neck are connected, and the crank axle bearing cup joints on the crank neck, and the bull gear axle has 2, and 2 bull gear axles are established respectively at the both ends of bent axle.

Further, 2 the pinion shaft and the crankshaft are of an integral structure.

Further, 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-handed gear, and the other end of pinion shaft is equipped with right hand gear, the pinion shaft is respectively through left-handed gear and right-handed gear and 2 gear engagement, the pinion shaft passes through pinion bearing and power end shell and is connected.

Furthermore, the bull gear shafts at the two ends of the crankshaft extend into the bull gear shaft boxes along the length direction, the bull gears are arranged in the bull gear shaft boxes, the number of the bull gear shaft boxes is 2, and the 2 bull gear shaft boxes are respectively arranged on the two sides of the crankshaft box.

Further, the pinion bearing is a cylindrical self-aligning roller bearing.

Furthermore, the pinion shaft box body is 2, 2 the both sides at the crankcase body are established respectively to the pinion shaft box body, the both ends of pinion shaft extend along length direction respectively and get into the pinion shaft box body, and the levogyration gear and the dextrorotation gear of pinion shaft establish respectively in 2 pinion shaft box bodies, and the spline of pinion shaft is established in the outside of pinion shaft box body, and the pinion shaft passes through the spline and is connected with external power source.

Compared with the prior art, the invention has the beneficial effects that:

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

Drawings

FIG. 1 is a schematic view of a seven-cylinder plunger pump according to the present invention;

FIG. 2 is a schematic diagram of an internal structure of a seven-cylinder plunger pump according to the present invention;

FIG. 3 is a schematic view of a gear train according to the present invention;

FIG. 4 is a schematic structural view of a crankshaft and a pinion shaft of the present patent;

FIG. 5 is a schematic view of a pinion shaft of the present patent;

FIG. 6 is a schematic view of the power end housing of this patent;

FIG. 7 is a schematic view of a fluid end assembly of the present patent.

The hydraulic power end assembly comprises a power end assembly 1, a hydraulic end assembly 2, a gear transmission mechanism 3, a power end shell 4, a crankshaft assembly 5, a connecting rod crosshead assembly 6, a plunger 7, a valve box 8, a pinion shaft 9, a bull gear 10, a pinion bearing 11, a crankshaft 12, a crank throw 13, a crank neck 14, a bull gear shaft 15, a right-hand gear 16, a left-hand gear 17, a spline 18, a crankcase 19, a bull gear box 20, a pinion shaft box 21 and a crosshead box 22.

Detailed Description

As shown in fig. 1 to 7, a seven-cylinder plunger pump has a crankshaft 12 with 7 crank throws 13, a plunger 7 with 7 cylinders, a valve box 8 with 7 cylinders, and each piston corresponding to 1 cylinder valve box 8 and reciprocating in the valve box 8, and each piston is powered by the rotation of 1 crank throw 13. Compared with a five-cylinder plunger pump and a three-cylinder plunger pump under the working conditions of the same rotating speed and stroke of the seven-cylinder structure, the seven-cylinder plunger pump has higher discharge capacity, higher pressure and lower discharge pulsation, and meets the requirements of large discharge capacity and high pressure of a well site. Through the increase of single seven jar plunger pump discharge capacity pressure, can also effectively reduce the fracturing equipment quantity of fracturing operation well site, more convenient and simplify the well site and arrange.

The seven-cylinder plunger pump comprises a power end assembly 1, a hydraulic end assembly 2 and a gear transmission mechanism 3, wherein the power end assembly 1 is connected with the hydraulic end assembly 2 through a bolt, and the gear transmission mechanism 3 is used for power input of the power end assembly 1.

Power end assembly 1 includes power end casing 4, crankshaft assembly 5 and connecting rod crosshead assembly 6 are established inside power end casing 4, and crankshaft assembly 5 and connecting rod crosshead assembly 6 are connected, hydraulic end assembly 2 includes plunger 7 and valve box 8, and reciprocating motion is made in valve box 8 to the one end of plunger 7, and the other end and the connecting rod crosshead assembly 6 of plunger 7 are connected, power end casing 4 includes crankcase 19, crosshead box 22, bull gear box 20 and pinion shaft box 21, crankcase 19 respectively with bull gear crosshead box 22, bull gear box 20 and pinion shaft box 21 are connected. The connecting rod crosshead assembly 6 includes a crosshead mechanism and a connecting rod mechanism, the crosshead mechanism is arranged in a crosshead case 22, the crankshaft assembly 5 is arranged in a crankcase 19, the connecting rod mechanism is arranged between the crankcase 19 and the crosshead case 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 shell 4 is integrally welded. The structure strength of the power end assembly 1 is higher, the supporting stability is better, the bearing deformation of the power end shell 4 can be effectively reduced, the integral vibration of the seven-cylinder plunger pump can be reduced, and the running stability of the seven-cylinder plunger pump is improved.

The crankshaft assembly 5 comprises a crankshaft 12, crankshaft bearings and a bull gear shaft 15, wherein the crankshaft 12 comprises crank throws 13 and crank necks 14, the crank throws 13 are connected with the crank necks 14, the number of the crank throws 13 is 7, the number of the crank necks 14 is 8, one crank throw 13 is arranged between every two adjacent crank necks 14, each crank neck 14 is sleeved with one crankshaft bearing, the crankshaft 12 is connected with a crankshaft box body 19 through the crankshaft bearings, the number of the bull gear shafts 15 is 2, and the 2 bull gear shafts 15 are respectively arranged at two ends of the crankshaft 12.

2 the big gear shaft 15 and the crankshaft 12 are of an integral structure, and under the condition that a larger displacement and a larger pressure are needed compared with a five-cylinder plunger pump, the good and stable transmission performance of the big gear shaft 15 to the crankshaft 12 is ensured, namely the good and stable power output of the crankshaft 12 is ensured.

Gear drive 3 includes pinion shaft 9, gear wheel 10 and pinion bearing 11, gear wheel 10 has 2, and 2 gear wheel 10 establish respectively at the both ends of bent axle 12, and 1 gear wheel 10 corresponds with 1 gear wheel shaft 15 and cup joints, and the one end of pinion shaft 9 is equipped with spline 18 and levogyration gear 17, and the other end of pinion shaft 9 is equipped with dextrorotation gear 16, pinion shaft 9 meshes with 2 gear wheel 10 through levogyration gear 17 and dextrorotation gear 16 respectively, pinion shaft 9 passes through pinion bearing 11 and is connected with power end casing 4.

The large gear shafts 15 at two ends of the crankshaft 12 extend into the large gear shaft box bodies 20 along the length direction, the large gears 10 are arranged in the large gear shaft box bodies 20, the number of the large gear shaft box bodies 20 is 2, and the 2 large gear shaft box bodies 20 are respectively arranged at two sides of the crankshaft box body 19. The pinion bearing 11 is a cylindrical self-aligning roller bearing. The number of the pinion shaft boxes 21 is 2, the 2 pinion shaft boxes 21 are respectively arranged on two sides of the crankcase 19, two ends of the pinion shaft 9 respectively extend into the pinion shaft boxes 21 along the length direction, the left-hand gear 17 and the right-hand gear 16 of the pinion shaft 9 are respectively arranged in the 2 pinion shaft boxes 21, the spline 18 of the pinion shaft 9 is arranged on the outer side of the pinion shaft boxes 21, and the pinion shaft 9 is connected with an external power source through the spline 18. By adopting a bilateral gear transmission mode, the gear transmission mechanism 3 simultaneously drives the large gears 10 at two ends of the crankshaft 12 through the left-handed gear 17 and the right-handed gear 16 on the small gear shaft 9, and the stress at two ends of the crankshaft 12 is balanced during bilateral transmission. When each crank throw 13 drives one plunger 7 to rotate, compared with a three-cylinder plunger pump and a five-cylinder plunger pump, the discharge pulsation of the hydraulic end assembly 2 is obviously reduced, the flow pulsation is smaller, the vibration of each part of the seven-cylinder plunger pump can be effectively reduced, the service life of each part is prolonged, the vibration impact of the whole manifold during fracturing operation can be reduced, and the use requirement of high pressure and large displacement of a well site can be met.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.