CN114718833A - Bushing structure and hydraulic end valve box of fracturing pump - Google Patents
Bushing structure and hydraulic end valve box of fracturing pump Download PDFInfo
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- CN114718833A CN114718833A CN202210220103.3A CN202210220103A CN114718833A CN 114718833 A CN114718833 A CN 114718833A CN 202210220103 A CN202210220103 A CN 202210220103A CN 114718833 A CN114718833 A CN 114718833A
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- bushing
- valve box
- interference surface
- plunger
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- 238000007789 sealing Methods 0.000 claims description 49
- 210000004907 gland Anatomy 0.000 claims description 39
- 230000007704 transition Effects 0.000 claims description 33
- 230000000903 blocking effect Effects 0.000 claims description 12
- 239000007788 liquid Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000003754 machining Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 230000008014 freezing Effects 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 229920001778 nylon Polymers 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Valves (AREA)
Abstract
The application relates to the technical field of fracturing pumps, in particular to a bushing structure and a hydraulic end valve box of a fracturing pump, wherein the bushing comprises a first interference surface and a second interference surface, one end of the first interference surface is connected with the second interference surface at an included angle, and the other end of the first interference surface extends along a direction far away from a first direction and close to a second direction; the bushing is provided with a first through hole along the second direction, and the bushing is provided with a second through hole along the first direction; the first direction and the second direction are perpendicular to each other; the limiting structure of the bushing in the valve box body is limited mainly by inclined surface contact, so that the falling risk of the bushing during operation under severe working conditions of high pressure, reciprocation, vibration and corrosivity for a long time is eliminated.
Description
Technical Field
The application relates to the technical field of fracturing pumps, in particular to a lining structure and a hydraulic end valve box of a fracturing pump.
Background
In the process of oil and natural gas exploitation, a fracturing pump is a device for realizing liquid pressurization by utilizing the reciprocating motion of a plunger in a cylinder body, and has the characteristics of compact structure, high pressure and high efficiency.
The valve box is a quick-wear part at the hydraulic end of the fracturing pump, most of common carbon steel valve boxes have the service life of less than 350 hours, and the long-life stainless steel valve boxes have the service life of 800 plus 1000 hours, but the valve box is expensive, and the whole valve box cannot be used due to the crack of one cavity.
The main working area of the valve box is the intersection of the horizontal through hole and the vertical through hole, and the intersection line is subjected to comprehensive actions of high pressure, corrosive medium, fatigue load and the like, so that cracks are easily generated in the valve box, and leakage occurs.
Disclosure of Invention
The technical problem that this application will be solved lies in overcoming above-mentioned prior art, and embedded valve box bush does not have strong limit structure in the axial, when being in the operation under the abominable operating mode of high pressure, reciprocal, vibration, corrosivity for a long time, appears the technical problem who drops easily, provides a bush structure and fracturing pump hydraulic end valve box.
In order to achieve the purpose, the invention adopts the following technical scheme:
a bushing structure is used for being installed in a hydraulic end valve box of a fracturing pump, and comprises a first interference surface and a second interference surface, wherein one end of the first interference surface is connected with the second interference surface in an included angle mode, and the other end of the first interference surface extends along a direction far away from a first direction and close to a second direction;
the bushing is provided with a first through hole along the second direction, and the bushing is provided with a second through hole along the first direction;
the first direction and the second direction are perpendicular to each other.
Preferably, the bushing is provided with a boss, and the boss is arranged on the first interference surface in a surrounding manner.
Preferably, the first through hole is formed in the second interference surface, and the boss and the first through hole are arranged at an interval.
Preferably, the first interference surface and the second interference surface form an included angle of 90-180 degrees and are connected.
The invention also protects a hydraulic end valve box of the fracturing pump, which comprises a valve box body and the lining structure;
a first sealing hole is formed in the valve box body along a first direction, and the bushing is located in the first sealing hole and is in interference fit with the valve box body;
wherein the first interference surface has the same slope as the first transition surface in the valve box body bore.
Preferably, a plurality of bosses are arranged on the second interference surface, and the interference surface of each boss is the same as the slope of the second transition surface and the slope of the third transition surface in the valve box body hole.
Preferably, the valve box body is provided with a second sealing hole along a second direction; the second interference surface is respectively arranged with the second transition surface and the third transition surface in a clearance mode, and the boss is arranged at the edge of the second sealing hole in a spaced mode.
Preferably, the valve housing body includes:
one end of the end cover is positioned in the first sealing hole and is in transition fit with the first end of the valve box body, and the end cover is connected with the bushing;
one end of the gland is positioned in the first sealing hole and is in transition fit with the second end of the valve box body, the gland is connected with the bushing, and the plunger penetrates through the gland and moves back and forth in the first sealing hole along the first direction;
wherein the first end is disposed opposite the second end.
Preferably, the gland is provided with an assembly hole, the plunger is installed in the assembly hole, one end of the plunger, which is located in the assembly hole, is sleeved with a sliding sleeve, and the sliding sleeve and the plunger are hermetically arranged at the plunger end of the bushing;
the bushing is provided with a second through hole along a first direction, the assembly hole is communicated with the second through hole, and the plunger can move back and forth towards the end cover along the assembly hole and the second through hole.
Preferably, one end of the sliding sleeve is connected with the end face of the lining, and the other end of the sliding sleeve is connected with a blocking cover;
wherein, the sliding sleeve with be equipped with seal assembly between the blanking cover, the blanking cover with the gland can be dismantled and be connected.
The technical scheme of the invention has the following advantages:
the limiting structure of the bushing in the valve box body is limited mainly by inclined surface contact, so that the falling risk of the bushing during operation under severe working conditions of high pressure, reciprocation, vibration and corrosivity for a long time is eliminated; furthermore, the main axial force (along the first direction) of the bushing is transmitted by matching with the inclined surface of the valve box, so that the requirement on the interference force is reduced, the assembling process only needs conventional interference assembly without liquid nitrogen auxiliary freezing assembly, the assembling difficulty between the bushing and the valve box is reduced, and the disassembling difficulty in replacement of easily damaged parts is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
FIG. 1 is a schematic diagram of a hydraulic end valve box of a fracturing pump;
FIG. 2 is a schematic view of the bushing;
FIG. 3 is a schematic structural view of the valve box body;
FIG. 4 is a schematic view of the bushing engaging the valve housing body;
FIG. 5 is an enlarged view of part A of FIG. 4;
FIG. 6 is a schematic structural view of the gland;
FIG. 7 is a schematic view of the construction of the closure;
FIG. 8 is a schematic structural view of an end cap;
FIG. 9 is a schematic structural view of an end face seal;
FIG. 10 is a schematic view of a portion B of FIG. 4;
wherein the reference numerals are as follows: 10. a valve box body; 11. a first seal bore; 111. a first transition surface; 112. a second transition surface; 113. a third transition surface; 12. a second sealing aperture; 20. a bushing; 21. a first interference surface; 22. a second interference surface; 221. a boss; 23. a first through hole; 24. a second through hole; 30. an end cap; 31. an end cover body; 32. a second groove; 33. a first bolt hole; 40. a gland; 41. a radial bore; 42. a nozzle tip; 43. a first groove; 44. an assembly hole; 45. pressing the cover body; 46. a second bolt hole; 47. an end face groove; x, a first direction; y, a second direction; 50. a plunger; 60. a sliding sleeve; 70. blocking the cover; 71. blocking the cover body; 72. framework oil seal; 73. a hollow annular groove; 80. a seal assembly; 90. and an end face seal body.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 2, an embodiment of the present invention provides a bushing structure, which is configured to be installed in a hydraulic end valve box of a fracturing pump, where a bushing 20 includes a first interference surface 21 and a second interference surface 22, one end of the first interference surface 21 is connected to the second interference surface 22 at an included angle, and the other end of the first interference surface 21 extends in a direction away from a first direction X and close to a second direction Y; wherein, the bush 20 is opened with a first through hole 23 along the second direction Y, and the bush 20 is opened with a second through hole 24 along the first direction X; the first direction X and the second direction Y are perpendicular to each other.
In an embodiment, the material of the bushing 20 of the present invention may be designed as a high strength material that is impact resistant, corrosion resistant, and wear resistant, such as stainless steel;
in an embodiment, the bushing 20 of the present invention may be used for an interference fit with the valve housing body 10; the bushing 20 is provided with a group of through holes (second through holes 24) in the axial direction (first direction X), the through holes (second through holes 24) are coaxially arranged with the outer cylindrical surface of the bushing 20, the slope of the inclined surface (first interference surface 21) of the bushing 20 close to the hole end of the end cover 30 is consistent with the slope of the transition inclined surface (first transition surface 111) of the valve box, and the designed structure aims to form a strong limiting structure in the axial direction (first direction X) of the bushing 20 of the valve box, so that the bushing 20 and the valve box body 10 are favorably connected in small interference fit, and meanwhile, when the valve box operates under severe working conditions of high pressure, reciprocation, vibration and corrosivity for a long time, the risk that the bushing 20 falls off is reduced;
in the embodiment, the bushing 20 of the present invention is further provided with a vertical (second direction Y) through hole (first through hole 23) perpendicular to the through hole (second through hole 24) in the axial direction (first direction X), and when the bushing 20 is installed in place, the vertical (second direction Y) through hole (first through hole 23) of the bushing 20 is aligned with the vertical (second direction Y) through hole (second seal hole 12) of the valve box, so as to ensure that the liquid sucking, draining and dispensing can enter the axial cavity. Similarly, when the axial liquid distribution scheme is adopted, the upper end or the lower end or both the upper end and the lower end of the vertical through hole can be eliminated, and the elimination scheme is consistent with the valve box scheme.
The limiting structure of the bushing 20 in the valve box body 10 is mainly limited by inclined surface contact, so that the falling risk of the bushing 20 during operation under severe working conditions of high pressure, reciprocation, vibration and corrosivity for a long time is eliminated; furthermore, the main axial force (along the first direction X) of the bushing 20 is transmitted by matching with the inclined surface of the valve box, so that the requirement on the interference force is reduced, the assembly process only needs conventional small interference assembly without liquid nitrogen auxiliary freezing assembly, the assembly difficulty between the bushing 20 and the valve box is reduced, and the disassembly difficulty in replacing the easily damaged parts is improved;
meanwhile, the bush 20 of the invention does not need to penetrate through the whole valve box body 10, the machining size of a high-precision hole required by the valve box is shortened, and the machining difficulty is reduced.
As shown in fig. 2, 4, 5 and 10, in the present embodiment, the bushing 20 is provided with a boss 221, and the boss 221 is disposed around the first interference surface 21;
the first through hole 23 is formed in the second interference surface 22, and the boss 221 and the first through hole 23 are arranged at intervals;
the valve box body 10 is provided with a second sealing hole 12 along a second direction Y; the second interference surface 22 is respectively arranged with the second transition surface 112 and the third transition surface 113 in a clearance manner, and the boss 221 is arranged with the edge of the second sealing hole 12 at an interval.
In an embodiment, the second interference surface 22 of the bushing 20 of the invention is provided as a cylindrical surface; the second interference surface 22 is provided with 2 stages of bosses 221 near both ends, and the radial through hole (first through hole 23) of the bush 20 is located between the two stages of bosses 221. When assembling, the outer surface of the boss 221 is matched with the inner surface of the first sealing hole 11 of the valve box body 10,
in the embodiment, a certain gap h exists between the second interference surface 22 of the bushing 20 and the inner wall of the first sealing hole 11, and the preferable value range h of h is less than or equal to 0.01D. In the liquid outlet direction, the boss 221 and the second sealing hole 12 of the valve box body 10 have a minimum distance S, and S preferably has a value range S of not less than 20 mm. The distances S1, S2 between the edge of the second sealing hole 12 and the bosses 221 at both ends may not be equal.
The invention reduces the abrasion of liquid to the hole edge at the intersection of the second sealing hole 12 and the first sealing hole 11. When liquid flows through the gap, small eddy currents are generated at the position, close to the hole, of the gap, and the existence of the eddy currents is beneficial to reducing the liquid pressure near the gap, so that the aim of reducing the abrasion to the edge is fulfilled.
Meanwhile, the bushing is provided with the boss 221, so that the inclined surface of the bushing does not need to be matched with the transition inclined surface in the valve box, the axial force transmitted from the end cover and the gland at two ends can completely act on the end face seal, the sealing performance of the end face seal is improved, and the requirement on the machining precision of the normal inner transition inclined surface can be reduced.
As shown in fig. 2, in the present embodiment, the first interference surface 21 and the second interference surface 22 are connected at an included angle of 90 ° to 180 °.
In an embodiment, the first interference surface 21 and the second interference surface 22 may be selected to be connected at an included angle of 145 °;
the limiting structure of the bushing 20 in the valve box body 10 is limited mainly by the included angle between the second interference surface 22 and the first interference surface 21 and the included angle between the inclined surfaces of 145 degrees, so that the falling risk of the bushing 20 during long-time operation under the severe working conditions of high pressure, reciprocation, vibration and corrosiveness is eliminated.
As shown in fig. 1, the present embodiment further provides a hydraulic end valve box of a fracturing pump, which includes a valve box body 10 and a bushing structure; a first sealing hole 11 is formed in the valve box body 10 along a first direction, and the bushing 20 is located in the first sealing hole 11 and is in interference fit with the valve box body 10; wherein, the slope of the first interference surface 21 is the same as that of the first transition surface 111 in the hole of the valve box body 10;
the second interference surface 22 is provided with a plurality of bosses 221, and the interference surface of each boss 221 has the same slope as the second transition surface 112 and the third transition surface 113 in the hole of the valve box body 10;
the valve box body 10 includes: one end of the end cover 30 is positioned in the first sealing hole 11 and is in transition fit with the first end of the valve box body 10, and the end cover 30 is connected with the bushing 20; the gland 40 and the plunger 50, one end of the gland 40 is positioned in the first sealing hole 11 and is in transition fit with the second end of the valve box body 10, the gland 40 is connected with the bush 20, and the plunger 50 penetrates through the gland 40 and moves back and forth in the first sealing hole 11 along a first direction; wherein the first end and the second end are oppositely arranged.
In an embodiment, the valve box body 10 of the present invention may be made of carbon steel, and has a through hole (first sealing hole 11) in the horizontal direction (first direction X), and the diameter of the first sealing hole 11 is larger at the end close to the plunger 50 and smaller at the end close to the end cap 30;
the interference surface of the valve box body 10 in interference fit with the bushing 20 is designed as bevel transition, if the interference surface is designed as right-angle transition, when the end cover 30 is installed, the force at the thread part forms stress concentration on the right-angle side of the valve box body 10, which easily causes cracks in the valve box, thereby causing leakage; two ports of the through hole (first sealing hole 11) in the horizontal direction (first direction X) of the valve box body 10 are provided with threads or a plurality of bolt mounting holes for flange connection, and are respectively used for mounting and fixing the end cover 30 and the gland 40.
Further, a through hole (second seal hole 12) in the vertical direction (second direction Y) of the valve box body 10 and a through hole (first seal hole 11) in the horizontal direction (first direction X) penetrate through the range where the bush 20 is attached, and dispense liquid for sucking and discharging liquid of the plunger 50. One conventional solution is to dispense liquid in a vertical direction (second direction Y), wherein a lower port in the vertical direction (second direction Y) is a liquid inlet, and an upper port in the vertical direction (second direction Y) is a liquid outlet. When an axial (first direction X) dispensing scheme is employed, there may be no vertical upper or lower ports, or neither.
In the embodiment shown in fig. 8, the end cap 30 of the present invention is composed of an end cap body 31 and an O-ring, and is in transition fit with the valve box fitting portion. The end cover body 31 is provided with a plurality of first bolt holes 33 distributed around the center, a second groove 32 is arranged on the outer diameter close to the end of the lining 20, and an O-shaped sealing ring is installed; when an axial (first direction X) liquid distribution structure is adopted, the end cap 30 further has a through hole for axial liquid distribution.
In the embodiment, the gland 40 of the present invention is composed of a gland body 45, an O-ring, and a nozzle tip 42, and is in transition fit with the valve box fitting portion. The gland body 45 has a large axially concentric through hole and a plurality of second bolt holes 46 surrounding the axial hole, the second bolt holes 46 being for bolt mounting, and the large through hole being for mounting the blanking cap 70, the plunger 50, the seal assembly 80, and the sliding sleeve 60. There is also an internal thread at the end near the cap 70 for threaded connection with the cap 70. The position of the radial hole 41 is aligned with the empty annular groove of the blocking cover 70, and the oil nozzle 42 is arranged on the outer side of the radial hole 41 and used for injecting lubricating oil into the empty annular groove of the blocking cover 70; a first groove 43 is provided on the outer diameter of the gland 40 near the end of the liner 20 for receiving an O-ring seal. An end face groove 47 is also provided adjacent the end face of the bushing 20 for mounting an end face seal.
The limiting structure of the bushing 20 in the valve box body 10 is mainly limited by inclined surface contact, so that the falling risk of the bushing 20 during operation under severe working conditions of high pressure, reciprocation, vibration and corrosivity for a long time is eliminated; furthermore, the main axial force (along the first direction X) of the bushing 20 is transmitted by matching with the inclined surface of the valve box, so that the requirement on the interference force is reduced, the assembly process only needs conventional small interference assembly without liquid nitrogen auxiliary freezing assembly, the assembly difficulty between the bushing 20 and the valve box is reduced, and the disassembly difficulty in replacing the easily damaged parts is improved;
meanwhile, the bush 20 of the invention does not need to penetrate through the whole valve box body 10, the machining size of a high-precision hole required by the valve box is shortened, and the machining difficulty is reduced;
in addition, the end cover 30 and the gland 40 are tightly pressed at the two opposite ends of the bush 20, and form axial sealing together with the plunger 50 at the plunger end of the bush 20, when facing high-pressure load, not only the interference force of the valve box and the bush 20 is required to resist external force, but also the end cover 30 and the gland 40 resist external force at the same time, so that the bush 20 is protected, and the standardization and batch production of parts of the bush 20 are facilitated.
As shown in fig. 6, in the present embodiment, the pressing cover 40 is provided with an assembly hole 44, the plunger 50 is installed in the assembly hole 44, one end of the plunger 50 located in the assembly hole 44 is sleeved with a sliding sleeve 60, and the sliding sleeve 60 and the plunger 50 are hermetically disposed at the plunger end of the bushing 20;
the bush 20 has a second through hole 24 along the first direction X, the fitting hole 44 communicates with the second through hole 24, and the plunger 50 can move back and forth along the fitting hole 44 and the second through hole 24 toward the end cap 30.
In an embodiment, the gland 40 of the present invention is connected to the valve housing by bolts (or flanges); by injecting lubricating oil into the nozzle 42 of the gland 40, the lubricating oil enters the gap between the plug 70 and the plunger 50 through the radial hole 41 of the plug 70, and provides lubrication for the movement of the plunger 50 in a series of seals, so that the high-pressure liquid generated between the plunger 50 and the bush 20 is completely confined in the cavity of the bush 20 by the end face seal body 90, the end cover 30 and the gland 40.
As shown in fig. 1 and 2, in the present embodiment, one end of the sliding sleeve 60 is connected to the end surface of the bushing 20, and the other end of the sliding sleeve 60 is connected to the blocking cover 70;
wherein, a sealing component 80 is arranged between the sliding sleeve 60 and the blocking cover 70, and the blocking cover 70 is detachably connected with the gland 40.
In an embodiment, the sliding sleeve 60 of the present invention is made of a material having self-lubricating property, and has a hardness lower than that of the plunger 50 and higher than that of the sealing group of the plunger 50, and preferably made of brass, plastic, nylon, etc. The plunger 50 and the gland 40 are in transition fit, one end of the end surface of the plunger 50 is contacted with the end surface of the bush 20, and the other end of the end surface of the plunger 50 is contacted with the end surface of the sealing group;
as shown in fig. 7, in the embodiment, the cap 70 of the present invention is composed of a cap body 71, an O-ring, and a skeleton oil seal 72. There is an axial (first direction X) through bore having a different diameter, larger near the end of the seal assembly 80. An inner annular groove is arranged at the end with the smaller diameter, and a framework oil seal 72 is installed; there are 2 sets of outer annular grooves on the outer diameter of the larger inner diameter end, with the O-ring installed in the annular groove away from the seal assembly 80, a hollow annular groove 73 located near the seal assembly 80, and one or more radial holes in the groove communicating the hollow annular groove 73 with the larger diameter inner bore, so that the lubricant entering the outer annular groove from the gland 40 can enter the inner larger diameter region through the radial holes. An external thread is provided on the outer surface of the blocking body 71 farther from the sealing assembly 80 with respect to the O-ring installation position to facilitate the connection of the blocking body 71 with the gland 40.
The sliding sleeve 60 of the present invention is not only designed to facilitate axial sealing with the plunger 50 at the plunger end of the bushing 20, but also to reduce wear on the plunger 50 and to reduce friction during operation of the plunger 50.
As shown in fig. 6, in the present embodiment, the gland 40 is opened with a radial hole 41 along the second direction Y, the radial hole 41 is provided with a nozzle 42, and the nozzle 42 is used for injecting the lubricating oil into the block cover 70.
In an embodiment, the design of the inventive nozzle tip 42 provides lubrication for the movement of the plunger 50 in a series of seals.
As shown in fig. 1 and 3, in the present embodiment, the second sealing hole 12 is disposed to intersect with the first sealing hole 11 and is used for dispensing the liquid to the plunger 50.
As shown in fig. 1 and 3, in the present embodiment, the first seal hole 11 is aligned with the second through hole 24, and the second seal hole 12 is aligned with the first through hole 23.
As shown in fig. 1, 3 and 9, in the present embodiment, the end face seal 90 is provided at each end of the bush 20 close to the plunger and the end of the bush 20 close to the end cap 30.
In the embodiment, the two end face sealing bodies 90 of the invention have the same structure, only have annular structures with different sizes, and are divided into 2 layers or a plurality of layers in the radial direction, the hardness of the inner ring material is lower than that of the bush 20, the end cover 30 and the gland 40 which are in contact with the inner ring material, and the inner ring material is preferably made of materials such as brass; the outer ring is made of a material having a lower hardness than the inner ring but a higher elasticity than the inner ring, and is preferably made of a material such as rubber or plastic. The outer ring and the inner ring are fixedly connected together, such as embedded, glued or vulcanized.
One of the end face sealing bodies 90 is pressed against the end cover 30 of the bushing 20 by the end cover 30 to form radial and axial sealing, so that high pressure in the bushing 20 cannot leak during operation.
As shown in fig. 6, in the present embodiment, the gland 40 is provided with a first groove 43 near the end surface of the liner 20, and an end surface sealing body 90 is mounted in the first groove 43.
In summary, the hydraulic end valve box of the fracturing pump provided by the invention mainly comprises a blocking cover 70, a gland 40, a valve box body 10, an end cover 30, an end face sealing body 90, a bushing 20, a sliding sleeve 60 and a sealing assembly 80; all the parts are coaxially arranged with the first-direction X through hole of the valve box body 10, wherein the bush is in small interference connection with the valve box; the end face seal body 90 is pressed tightly against the bush by the gland 40 to form a seal in the radial direction of the plunger end of the bush 20; the sliding sleeve 60, the seal assembly 80, is compressed against the end face of the liner 20 by the cap 70, together with the plunger 50, forming an axial seal at the plunger end of the liner 20. The gland 40 is connected with the valve box body 10, and the blanking cover 70 is connected with the gland 40 through bolts (or flanges); the end face sealing body 90 is tightly pressed at the end cover end of the bushing 20 by the end cover 30, radial and axial sealing is formed, and high pressure in the bushing cannot leak in work; except for the matching connection with special requirements, all connection structures such as flanges, threads, vulcanization and the like provided in the scheme are not limited by the scheme, and the connection structures which are used in the field and can realize the required requirements are all within the protection range of the scheme.
The limiting of the bushing 20 under the action of large pressure is limited by the contact of the inclined plane, so that the falling risk of the bushing in operation under the severe working conditions of high pressure, reciprocation, vibration and corrosivity for a long time is eliminated; meanwhile, the bushing 20 does not need to penetrate through the whole valve box, the machining size of a high-precision hole needed by the valve box is shortened, and the machining difficulty is reduced; the main axial force of the bushing 20 is transmitted by matching with the inclined plane of the valve box, so that the requirement on interference force is reduced, the assembly process only needs conventional interference assembly, liquid nitrogen auxiliary freezing assembly is not needed, and the assembly difficulty is reduced; the assembly difficulty of the bushing 20 and the valve box is low, and the disassembly difficulty in replacement of easily damaged parts is improved; the high-pressure load does not need the interference resistance of the valve box and the bushing 20, even if the mounting hole of the bushing 20 of the valve box is slightly worn, the bushing 20 and the valve box do not need to be kept in strict matching relation, and the standardization and the batch production of the parts of the bushing 20 are facilitated.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present application and are presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A bushing structure is used for being installed in a hydraulic end valve box of a fracturing pump, and is characterized in that a bushing (20) comprises a first interference surface (21) and a second interference surface (22), one end of the first interference surface (21) is connected with the second interference surface (22) in an included angle mode, and the other end of the first interference surface (21) extends in a direction far away from a first direction and close to a second direction;
wherein the bush (20) is provided with a first through hole (23) along the second direction, and the bush (20) is provided with a second through hole (24) along the first direction;
the first direction and the second direction are perpendicular to each other.
2. The bushing arrangement according to claim 1, characterized in that the bushing (20) is provided with a boss (221), the boss (221) being provided around the first interference surface (21).
3. A bushing arrangement according to claim 2, characterized in that the first through hole (23) opens in the second interference surface (22), and the boss (221) is arranged at a distance from the first through hole (23).
4. A bushing arrangement according to claim 1, characterized in that said first interference surface (21) is connected to said second interference surface (22) at an angle of 90 ° to 180 °.
5. A frac pump hydraulic end valve manifold comprising a manifold body (10) and a liner structure as claimed in claim 3;
a first sealing hole (11) is formed in the valve box body (10) along a first direction, and the bushing (20) is located in the first sealing hole (11) and is in interference fit with the valve box body (10);
wherein the first interference surface (21) has the same slope as a first transition surface (111) in the bore of the valve housing body (10).
6. The fracturing pump hydraulic end valve box according to claim 5, wherein the second interference surface (22) is provided with a plurality of bosses (221), and the interference surface of each boss (221) is the same as the slope of the second transition surface (112) and the third transition surface (113) in the hole of the valve box body (10).
7. The fracturing pump hydraulic end valve box according to claim 6, wherein the valve box body (10) is provided with a second sealing hole (12) along a second direction; the second interference surface (22) is in clearance arrangement with the second transition surface (112) and the third transition surface (113), and the boss (221) is in clearance arrangement with the edge of the second sealing hole (12).
8. The frac pump hydraulic end valve manifold of claim 5, wherein the manifold body (10) comprises:
one end of the end cover (30) is located in the first sealing hole (11) and is in transition fit with the first end of the valve box body (10), and the end cover (30) is connected with the bushing (20);
a gland (40) and a plunger (50), wherein one end of the gland (40) is positioned in the first sealing hole (11) and is in transition fit with the second end of the valve box body (10), the gland (40) is connected with the bushing (20), and the plunger (50) penetrates through the gland (40) and moves back and forth in the first sealing hole (11) along the first direction;
wherein the first end is disposed opposite the second end.
9. The fracturing pump hydraulic end valve box according to claim 8, wherein the gland (40) is provided with a fitting hole (44), the plunger (50) is installed in the fitting hole (44), one end of the plunger (50) positioned in the fitting hole (44) is sleeved with a sliding sleeve (60), and the sliding sleeve (60) and the plunger (50) are hermetically arranged at the plunger end of the bushing (20);
wherein the bush (20) is provided with a second through hole (24) along a first direction, the assembly hole (44) is communicated with the second through hole (24), and the plunger (50) can move back and forth along the assembly hole (44) and the second through hole (24) towards the end cover (30).
10. The fracturing pump hydraulic end valve box according to claim 9, wherein one end of the sliding sleeve (60) is connected with the end face of the bushing (20), and the other end of the sliding sleeve (60) is connected with a blocking cover (70);
wherein, be equipped with seal assembly 80 between sliding sleeve (60) and blanking cover (70), blanking cover (70) with gland (40) can dismantle the connection.
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