CN109882372A - A kind of reciprocating three-cylinder plunger pump of oil gas field - Google Patents

Abstract

The present invention provides a kind of reciprocating three-cylinder plunger pumps of oil gas field, including the gearbox assembly, power end assembly and fluid end assembly being successively driven, the fluid end assembly includes packing and plunger, the power end assembly includes crankshaft, connecting rod, sliding rail and crosshead, power is transmitted to plunger from crosshead, pull rod and mud guard are equipped between the plunger and crosshead, pull rod is fixed in crosshead, plunger is fixed on pull rod, mud guard is fixed between pull rod and plunger by plunger, and the outer diameter of mud guard is greater than the outer diameter of plunger and pull rod.The working media that the present invention is able to solve in fluid end assembly in the prior art is sprayed onto inside power end assembly along plunger, replaces the problems such as inconvenient packing, big end bearing shell lack of lubrication.

Description

A kind of reciprocating three-cylinder plunger pump of oil gas field

Technical field

The present invention relates to oil gas drilling-production equipment fields, and in particular to a kind of reciprocating three-cylinder plunger pump of oil gas field.

Background technique

Reciprocating three-cylinder plunger pump belongs to positive displacement pump, and conveying liquid is reached by means of the cyclically-varying of working chamber internal volumeThe purpose of body.At work, mechanical energy is converted into the pressure energy of conveying liquid through plunger pump.Reciprocating plunger pump is extensiveIt is the critical component of the equipment such as oil gas field well cementation, acidification, pressure break for oil gas field field.

Reciprocating three-cylinder plunger pump generally all can be by being installed on vehicle or sled, when with back-to-back in back-to-back fashionWhen form is installed, the overall width of two pumps is no more than rto request.For example, on the road of China and Russia when driving,The overall width of equipment is no more than 2550mm.Reciprocating three-cylinder plunger pump in order in back-to-back installation overall width can satisfyRoad requires, and overall structure is very compact.

Plunger in the prior art is mounted directly in the crosshead inside power end assembly, on the one hand, when fluid end is totalAfter packing in for sealed plunger is damaged, the high-pressure working medium inside fluid end assembly will directly be let out along plungerLeakage, and then the sealing element at power end assembly is contacted and destroys, the working media inside final fluid end assembly will be sprayed ontoInside power end assembly；On the other hand, packing is in order to seal up the high-pressure working medium inside fluid end assembly, with columnThe magnitude of interference of plug is very big, i.e. packing can tightly embrace plunger, and the plunger rear surface that works long hours can be worn, it may appear thatThe deep groove mark of a lot of, the working media leaked out after packing damage can enter with the reciprocating motion of plunger along groove markTo inside power end assembly.After working media in fluid end assembly enters power end assembly inside, lubricating oil can be polluted, mostLead to the damage of power end assembly and gearbox assembly eventually.

Operating space at packing in the prior art is very narrow, since the packing of sealed plunger belongs to vulnerable part, needsIt often to replace, require first to disassemble the sealing element of power end when replacing packing every time, then could replace packing, graspIt is inconvenient to make.There is no lubricating oil duct inside crankshaft in the prior art, big end bearing shell is in end lubrication, there is lubrication notThe situation of foot.

Summary of the invention

It is sprayed onto it is an object of the invention to solving the working media in fluid end assembly in the prior art along plunger dynamicInside the assembly of power end, the problems such as replacement packing is inconvenient, big end bearing shell lack of lubrication, a kind of oil gas field is provided with reciprocating threeCylinder plunger pump.

The purpose of the present invention is what is reached by following technical measures:

The reciprocating three-cylinder plunger pump of a kind of oil gas field, including the gearbox assembly, power end assembly and liquid being successively drivenPower end assembly, the fluid end assembly include packing and plunger, and the power end assembly includes crankshaft, connecting rod, sliding rail and crossHead, power are transmitted to plunger from crosshead, and pull rod and mud guard are equipped between the plunger and crosshead, and pull rod is fixed on crossOn head, plunger is fixed on pull rod, and mud guard is fixed between pull rod and plunger by plunger, and the outer diameter of mud guard is bigIn the outer diameter of plunger and pull rod.

Further, the power end assembly further includes power end housing, oil seal of pull rod, oil seal of pull rod seat and oil seal of pull rodBaffle, oil seal of pull rod seat and oil seal of pull rod baffle are fixed in power end housing, and oil seal of pull rod is installed to inside oil seal of pull rod seat,And it is fixed by oil seal of pull rod baffle.

Further, one end of the connecting rod is connect with crankshaft, and the other end is connect with crosshead, and the sliding rail is fixed on dynamicIn power end housing, crosshead moves back and forth inside sliding rail, and crosshead drives plunger past inside fluid end assembly by pull rodMultiple movement carries out the sucking and discharge work of liquid.

Further, the power end assembly further include crosshead pin shaft, crosshead pin hubcap, small end of connecting rod bearing shell,Connecting rod upper bearing shell and connecting rod lower bearing shell, connecting rod upper bearing shell, connecting rod lower bearing shell are mounted in connecting rod, and small end of connecting rod bearing shell is fixed to tenInside prefix, crosshead pin hubcap is mounted on cross both sides of head, is used to support crosshead pin shaft, is equipped with inside the microcephaly of connecting rodCrosshead axle sleeve, and linked together by crosshead pin shaft and crosshead.

Further, crosshead pin shaft two sides are limited by circlip for shaft；Between crosshead and pull rodAdded with for preventing the oil leak inside power end assembly to external O-ring.

Further, oil leab is equipped in the crankshaft, crankshaft is connected with crankshaft rotary joint, crankshaft rotary joint peaceIn power end housing, the bearing shell at big end is lubricated when lubricating oil passes through crankshaft.

Further, the pull rod passes through Surface hardening treatment.

Further, the oil seal of pull rod baffle bottom is provided with the remaining a small amount of working media of oil seal of pull rod baffle bottomThe dirt discharge groove exhausted.

By adopting the above-described technical solution, the invention has the advantages that

Pull rod and mud guard are added between crosshead and plunger, cure process is passed through on pull rod surface, and wearability is good, can be withIt uses for a long time；

The outer diameter of mud guard will be big than the outer diameter of pull rod and plunger, after packing damage, the work that is leaked out along plungerMedium can effectively be stopped by mud guard, and working media will not touch pull rod periphery and oil seal of pull rod, and then block workMedium is sprayed onto inside power end；

Oil seal of pull rod baffle bottom is provided with dirt discharge groove, the remaining a small amount of working media of oil seal of pull rod baffle bottom can be arrangedFall；

The operating space of replacement packing is increased, it is same to replace without disassembling oil seal of pull rod seat when replacing packingWithout disassembly packing box when oil seal of pull rod；

There is oil leab in crankshaft, and crankshaft rotary joint is installed in crankshaft side, lubricating oil is big to connecting rod by crankshaftHead bearing shell carries out sufficient lubrication, improves the service life of big end bearing shell.

Present invention will be further explained below with reference to the attached drawings and specific embodiments.

Detailed description of the invention

Fig. 1 is the back-to-back scheme of installation of the present invention；

Fig. 2 is structural schematic diagram of the prior art in lower dead point position；

Fig. 3 is structural schematic diagram of the prior art in upper dead center position；

Fig. 4 is structural schematic diagram of the present invention in lower dead point position；

Fig. 5 is the structural schematic diagram of the present invention at an arbitrary position；

Fig. 6 is structural schematic diagram of the present invention in upper dead center position；

Fig. 7 is connecting rod cross head assembly structural schematic diagram of the present invention；

Fig. 8 is oil seal of pull rod seat assembly structural schematic diagram of the present invention,

Wherein, 1, power end assembly, 2, gearbox assembly, 3, fluid end assembly, 4, crankshaft rotary joint, 5, plunger, 6,Packing, 7, mud guard, 8, hexagon socket cap head screw, 9, pull rod, 10, oil seal of pull rod baffle, 11, O-ring, 12, oil seal of pull rodSeat, 13, oil seal of pull rod, 14, O-ring, 15, pressing plate, 16, hexagon socket cap head screw, 17, crosshead, 18, sliding rail, 19, connecting rodMicrocephaly's bearing shell, 20, crosshead axle sleeve, 21, crosshead pin shaft, 22, connecting rod, 23, connecting rod lower bearing shell, 24, connecting rod upper bearing shell, 25,Crankshaft, 26, bearing, 27, power end housing, 28, crosshead pin hubcap, 29, circlip for shaft, 30, plunger (existing skillArt), 31, sealing seat assembly (prior art), 32, sliding rail (prior art), 33, plunger connection bolt (prior art), 34, tenPrefix (prior art), 35, small end of connecting rod bearing shell (prior art), 36, crosshead pin (prior art), 37, connecting rod (existing skillArt), 38, dirt discharge groove.

Specific embodiment

The prior art is as shown in Figure 2 and Figure 3, and plunger 30 connects bolt 33 by plunger and is mounted directly in power end assemblyIn the crosshead 34 in portion, on the one hand, after the packing 6 for being used for sealed plunger 30 in fluid end assembly 3 is damaged, fluid end is totalIt will directly be leaked along plunger 30 at the high-pressure working medium inside 3, and then contact and destroy the seal receptacle at power end assembly 1Sealing element in assembly 31, the working media inside final fluid end assembly 3 will be sprayed onto inside power end assembly 1；It is anotherAspect, packing 6 is in order to seal up the high-pressure working medium inside fluid end assembly 3, very with the magnitude of interference of plunger 30Greatly, i.e. packing 6 can tightly embrace plunger 30, and the rear surface that works long hours of plunger 30 can be worn, it may appear that a lot of ratioDeeper groove mark, the working media that packing 6 leaks out after damaging can enter with the reciprocating motion of plunger 30 along groove mark dynamicInside power end assembly 1.After working media in fluid end assembly 3 enters 1 inside of power end assembly, lubricating oil can be polluted, mostLead to the damage of power end assembly 1 and gearbox assembly 2 eventually.

As shown in Fig. 1, Fig. 4-8, the present invention includes power end assembly 1, gearbox assembly 2 and fluid end assembly 3；Gear-boxAssembly 2 and fluid end assembly 3 are bolted on power end assembly 1, the output end and power end assembly of gearbox assembly 22 crankshaft 25 connects.Sliding rail 18 is bolted in power end housing 27, the interior hexagonal cylindrical head of small end of connecting rod bearing shell 19Screw 16 and pressing plate 15 are fixed in crosshead 17, and crosshead pin hubcap 28 can be mounted directly in crosshead 17, by tenPrefix 17, hexagon socket cap head screw 16, pressing plate 15, small end of connecting rod bearing shell 19, crosshead pin hubcap 28 are co-mounted to dynamicOn sliding rail 18 in power end housing 27, bearing 26 is mounted on crankshaft 25, and bearing 26 and crankshaft 25 are fixed to power end togetherOn shell 27, crosshead axle sleeve 20, connecting rod upper bearing shell 24, connecting rod lower bearing shell 23 are mounted in connecting rod 22,22 one end of connecting rod withCrankshaft 25 connects, and the other end is linked together by crosshead pin shaft 21 with crosshead 17, and 21 both ends of crosshead pin shaft are used with axisCirclip 29 is limited, and O-ring 14 is installed in crosshead 17, for preventing the lubricating oil inside power end assembly 1Outside is leaked into, pull rod 9 is fixed in crosshead 17 with hexagon socket cap head screw 8, oil seal of pull rod 13, O-ring 11 are installedOnto oil seal of pull rod seat 12, oil seal of pull rod seat 12, oil seal of pull rod 13 and O-ring 11 are co-mounted in power end housing, used10 steady brace oil sealing 13 of oil seal of pull rod baffle, with hexagon socket cap head screw by oil seal of pull rod seat 12, oil seal of pull rod baffle 10It is fixed in power end housing 27 together, pull rod 9 is fixed by screws in crosshead 17；There is external screw thread in 5 one end of plunger, can be withIt is affixed directly on pull rod 9；Mud guard 7 is located among pull rod 9 and plunger 5, is fixed by plunger 5, the outer diameter of mud guard 7Outer diameter than plunger 5 and pull rod 9 is all big, can prevent the working media emitted back inside fluid end assembly 3 from touching drawing9 periphery of bar and oil seal of pull rod 13, and then block working media and be sprayed onto inside power end assembly 1.Crankshaft rotary joint 4 is pacifiedIt is attached in power end housing, and is connected with crankshaft 25, for being the connecting rod lower bearing shell 23 at big end by crankshaft 25 and connectingBar top bearing shell 24 provides lubricating oil.

Implementation process of the invention:

As shown in Fig. 1, Fig. 4-8, power end housing 27 supports crankshaft 25 by bearing 26, and gearbox assembly 2 drives songAxis 25 rotates, and crankshaft 25 drives connecting rod 22, and connecting rod 22 drives crosshead 17 by crosshead pin shaft 21, and crosshead 17 is in sliding rail 18Inside moves back and forth, and crosshead 17 drives plunger 5 to move back and forth inside fluid end assembly 3 by pull rod 9, carries out the suction of liquidEnter and discharge work.

After packing 6 damages, the high-pressure working medium inside fluid end assembly 3 will leak into outside along plunger 5, with gearMud plate 7 directly contacts, and since the outer diameter of mud guard 7 will be big than the outer diameter of pull rod 9 and plunger 5, leaks out along plunger 5Working media can effectively be stopped by mud guard 7, liquid will not touch 9 periphery of pull rod and oil seal of pull rod 13, finally preventWorking media inside fluid end assembly 3 is sprayed onto inside power end assembly 1.In addition, in 5 reciprocatory movement of plunger,Mud guard 7 can also move back and forth in oil seal of pull rod baffle 10 with plunger 5, therefore leaked out after the damage of packing 6 along plunger 5Working media can flow to the bottom of oil seal of pull rod baffle 10 along mud guard 7, due in 7 outer diameter of mud guard and oil seal of pull rod baffle 10Gap between diameter is very small, therefore can quilt along the most work medium that mud guard 7 flows to 10 bottom of oil seal of pull rod baffleMud guard 7 is released, and a small amount of working media under remaining can be discharged to outside along the dirt discharge groove 38 of 10 bottom of oil seal of pull rod baffle.

Claims (8)

1. the reciprocating three-cylinder plunger pump of a kind of oil gas field, including the gearbox assembly, power end assembly and fluid power being successively drivenAssembly is held, the fluid end assembly includes packing and plunger, and the power end assembly includes crankshaft, connecting rod, sliding rail and crosshead,Power is transmitted to plunger from crosshead, it is characterised in that: pull rod and mud guard is equipped between the plunger and crosshead, pull rod is solidIt is scheduled in crosshead, plunger is fixed on pull rod, and mud guard is fixed between pull rod and plunger by plunger, mud guardOuter diameter be greater than plunger and pull rod outer diameter.

2. a kind of reciprocating three-cylinder plunger pump of oil gas field according to claim 1, it is characterised in that: the power end is totalAt further including power end housing, oil seal of pull rod, oil seal of pull rod seat and oil seal of pull rod baffle, oil seal of pull rod seat and oil seal of pull rod baffleIt is fixed in power end housing, oil seal of pull rod is installed to inside oil seal of pull rod seat, and is fixed by oil seal of pull rod baffle.

3. a kind of reciprocating three-cylinder plunger pump of oil gas field according to claim 2, it is characterised in that: the one of the connecting rodEnd is connect with crankshaft, and the other end is connect with crosshead, and the sliding rail is fixed in power end housing, and crosshead is past inside sliding railMultiple movement, crosshead drive plunger to move back and forth inside fluid end assembly by pull rod, carry out the sucking and discharge work of liquidMake.

4. a kind of reciprocating three-cylinder plunger pump of oil gas field according to claim 3, it is characterised in that: the power end is totalAt further including crosshead pin shaft, crosshead pin hubcap, small end of connecting rod bearing shell, connecting rod upper bearing shell and connecting rod lower bearing shell, on connecting rodBearing shell, connecting rod lower bearing shell are mounted at the major part of connecting rod, and small end of connecting rod bearing shell is fixed to inside crosshead, crosshead pin hubcapIt is mounted on cross both sides of head, crosshead pin shaft is used to support, crosshead axle sleeve is housed inside the microcephaly of connecting rod, and pass through crossheadPin shaft and crosshead link together.

5. a kind of reciprocating three-cylinder plunger pump of oil gas field according to claim 4, it is characterised in that: the crosshead pinAxis two sides are limited by circlip for shaft；Added with for preventing inside power end assembly between crosshead and pull rodO-ring of the oil leak to outside.

6. a kind of reciprocating three-cylinder plunger pump of oil gas field according to claim 4, it is characterised in that: set in the crankshaftThere is oil leab, crankshaft is connected with crankshaft rotary joint, and crankshaft rotary joint is mounted in power end housing, and lubricating oil passes through songThe bearing shell at big end is lubricated when axis.

7. a kind of reciprocating three-cylinder plunger pump of oil gas field according to claim 1, it is characterised in that: the pull rod passes throughSurface hardening treatment.

8. a kind of reciprocating three-cylinder plunger pump of oil gas field according to claim 2, it is characterised in that: the oil seal of pull rodBaffle bottom is provided with the dirt discharge groove for exhausting the remaining a small amount of working media of oil seal of pull rod baffle bottom.