CN215979846U - Fluid end and plunger pump - Google Patents

Abstract

A fluid end and plunger pump. The hydraulic end comprises a valve box and a first cavity which is positioned in the valve box and extends along a first direction; the first cavity comprises a first end part and a second end part, the first end part comprises a first threaded part and a first groove, the first groove is positioned on one side, close to the second end part, of the first threaded part, and the first groove is recessed towards the valve box from the inner side wall of the first cavity. Therefore, the hydraulic end is provided with the first groove on one side of the first thread part close to the second end part, namely the first groove is arranged at the root of the first thread part, so that the root of the first thread part can be prevented from generating large alternating stress under the action of high pressure, and cracks can be relieved or even avoided. Therefore, the hydraulic end can enable the plunger pump adopting the hydraulic end to have longer service life, and can reduce the maintenance cost caused by the generation of cracks in the valve box.

Description

Fluid end and plunger pump

Technical Field

Embodiments of the present disclosure relate to a hydraulic tip and plunger pump.

Background

In the field of oil and gas exploitation, the fracturing technology refers to a technology for forming cracks on oil and gas layers by using high-pressure fracturing fluid in the oil or gas exploitation process. The fracturing technology enables the oil-gas layer to form cracks, so that the flowing environment of oil or natural gas underground can be improved, and the yield of an oil well is increased. Therefore, the fracturing technology can be applied to the development of unconventional oil and gas and shale oil and gas and is also a main yield increasing mode in the exploitation process of oil and gas fields.

The plunger pump is a device which converts the rotation motion of a crankshaft into the reciprocating motion of a plunger by using a crankshaft connecting rod mechanism and realizes the pressurization of liquid by using the reciprocating motion of the plunger in a cavity inside a valve box. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and the like, so the plunger pump is widely applied to the fracturing technology.

SUMMERY OF THE UTILITY MODEL

In a general plunger pump, on one hand, because the pressure change in a fluid cavity in a fluid end is large, phenomena such as cracking and the like are easily generated at some stress concentration positions; and the strength of the hydraulic end per se also needs to be optimized; on the other hand, the installation and maintenance work is complicated due to the fact that the number of parts of the hydraulic end is large.

In order to solve the above technical problem, embodiments of the present disclosure provide a hydraulic end and a plunger pump. The hydraulic end comprises a valve box and a first cavity which is positioned in the valve box and extends along a first direction; the first cavity comprises a first end part and a second end part, the first end part comprises a first threaded part and a first groove, the first groove is positioned on one side, close to the second end part, of the first threaded part, and the first groove is recessed towards the valve box from the inner side wall of the first cavity. Therefore, the hydraulic end is provided with the first groove on one side of the first thread part close to the second end part, namely the first groove is arranged at the root of the first thread part, so that the root of the first thread part can be prevented from generating large alternating stress under the action of high pressure, and cracks can be relieved or even avoided. Therefore, the hydraulic end can enable the plunger pump adopting the hydraulic end to have longer service life, and can reduce the maintenance cost caused by the generation of cracks in the valve box.

At least one embodiment of the present disclosure provides a fluid end, comprising: a valve box; the first cavity is positioned inside the valve box and extends along a first direction; the first cavity includes a first end portion and a second end portion, the first end portion includes a first thread portion and a first groove, the first groove is located on a side of the first thread portion close to the second end portion, and the first groove is recessed from an inner side wall of the first cavity toward the valve housing.

For example, in the fluid end provided in an embodiment of the present disclosure, the second end portion includes a second threaded portion and a second groove, the second groove is located on a side of the second threaded portion close to the first end portion, and the second groove is recessed from an inner side wall of the first cavity toward the valve housing.

For example, in the hydraulic end provided in an embodiment of the present disclosure, the first groove is an annular groove disposed along an inner sidewall of the first cavity, and a diameter of the first groove is greater than an inner diameter of the first end portion.

For example, in the hydraulic end provided in an embodiment of the present disclosure, the second groove is an annular groove disposed along an inner sidewall of the first cavity, and a diameter of the second groove is larger than an inner diameter of the second end portion.

For example, an embodiment of the present disclosure provides a fluid end further including: the second cavity is positioned inside the valve box and extends along a second direction, the second direction is intersected with the first direction, the second cavity comprises a third end portion and a fourth end portion, the third end portion comprises a third threaded portion and a third groove, the third groove is positioned on one side, close to the fourth end portion, of the third threaded portion, and the third groove is recessed towards the valve box from the inner side wall of the second cavity.

For example, an embodiment of the present disclosure provides a fluid end further including: a packing assembly located at the first end; the packing pressing cap is positioned at the first end part and is positioned at one side of the packing assembly, which is far away from the second end part; the packing presses the cap with first screw thread portion passes through threaded connection, the packing subassembly includes hole in the middle of the first, the packing presses the cap to include hole in the middle of the second.

For example, an embodiment of the present disclosure provides a fluid end further including: a plunger at least partially located at the first end and configured to move within the first intermediate bore and the second intermediate bore, a face of the plunger proximate the second end being spherical.

For example, an embodiment of the present disclosure provides a fluid end further including: and the packing anti-loosening assembly is positioned on the packing pressing cap and is configured to prevent the packing pressing cap from loosening.

For example, in a fluid end provided in an embodiment of the present disclosure, the packing gland includes packing threads, the first threaded portion includes first threads, and the pitch of the packing threads and the first threads is greater than 5 millimeters.

For example, an embodiment of the present disclosure provides a fluid end further including: a first gland at the second end; and the first pressing cap is positioned at the second end part and is positioned on one side of the first pressing cover, which is far away from the first end part, and the first pressing cap is in threaded connection with the second threaded part.

For example, an embodiment of the present disclosure provides a fluid end further including: a second gland located at the third end; and the second pressing cap is positioned at the third end part and is positioned on one side of the second pressing cover, which is far away from the fourth end part, and the second pressing cap is in threaded connection with the third threaded part.

For example, in the hydraulic end provided in an embodiment of the present disclosure, the valve box includes a first main body portion and a second main body portion, the first cavity extends from the first main body portion to the second main body portion, the first end portion is at least partially located within the first main body portion, the second end portion is at least partially located within the second main body portion, the first main body portion includes a cavity portion and a connecting portion, the first end portion is at least partially located in the cavity portion, the connecting portion extends from the cavity portion radially outward of the first end portion and is spaced apart from the second main body portion, and the valve box further includes a connecting hole located in the connecting portion and penetrating through the connecting portion.

For example, in a fluid end provided in an embodiment of the present disclosure, the fluid end includes N first cavities, the N first cavities are spaced apart along a third direction, the third direction is perpendicular to the first direction, the valve housing includes 2(N +1) connecting holes, and a diameter of the connecting holes ranges from 1.5 inches to 2.5 inches.

For example, an embodiment of the present disclosure provides a fluid end further including: a lifting latch on the valve box and configured to couple to a lifting tool.

An embodiment of the present disclosure provides a plunger pump including any one of the fluid ends described above.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure and are not limiting to the present disclosure.

FIG. 1 is a schematic cross-sectional view of a fluid end according to an embodiment of the present disclosure;

FIG. 2 is an enlarged schematic view of a first groove in a fluid end according to one embodiment of the present disclosure;

FIG. 3 is an enlarged schematic view of a second groove in a fluid end according to one embodiment of the present disclosure;

FIG. 4 is an enlarged schematic view of a third groove in a fluid end according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a hydraulic tip according to an embodiment of the present disclosure;

FIG. 6A is a schematic diagram of another fluid end according to an embodiment of the present disclosure;

FIG. 6B is a schematic cross-sectional view of another fluid end provided in accordance with an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of another fluid end according to an embodiment of the present disclosure; and

fig. 8 is a schematic structural diagram of a plunger pump according to an embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

Typically, a plunger pump includes a power end, a fluid end, and a plunger; the power end comprises a crankshaft connecting rod mechanism, a crosshead mechanism and a pull rod, and the pull rod is connected with the plunger; the fluid end includes a fluid cavity. The power end can convert the rotary motion input by the prime motor into the reciprocating motion of the pull rod through the matching of the crankshaft connecting rod mechanism and the crosshead mechanism, so that the plunger connected with the pull rod can reciprocate; the plunger is at least partially positioned in the fluid cavity, and the volume of the fluid cavity can be changed during the reciprocating motion of the plunger, so that the fluid and the suction and compression are realized, and the continuous conversion of low-pressure fluid into high-pressure fluid can be realized.

However, the inventors of the present application noted that: on one hand, the pressure change in the fluid cavity in the hydraulic end is large, so that the phenomena of cracking and the like are easily generated at some stress concentration parts; and the strength of the hydraulic end per se also needs to be optimized; on the other hand, the installation and maintenance work is complicated due to the fact that the number of parts of the hydraulic end is large.

In this regard, the disclosed embodiments provide a hydraulic tip and plunger pump. The hydraulic end comprises a valve box and a first cavity which is positioned in the valve box and extends along a first direction; the first cavity comprises a first end part and a second end part, the first end part comprises a first threaded part and a first groove, the first groove is positioned on one side, close to the second end part, of the first threaded part, and the first groove is recessed towards the valve box from the inner side wall of the first cavity. Therefore, the hydraulic end is provided with the first groove on one side of the first thread part close to the second end part, namely the first groove is arranged at the root of the first thread part, so that the root of the first thread part can be prevented from generating large alternating stress under the action of high pressure, and cracks can be relieved or even avoided. Therefore, the hydraulic end can enable the plunger pump adopting the hydraulic end to have longer service life, and can reduce the maintenance cost caused by the generation of cracks in the valve box.

Hereinafter, the hydraulic tip and the plunger pump provided by the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

An embodiment of the present disclosure provides a hydraulic end of a plunger pump. Fig. 1 is a schematic cross-sectional view of a hydraulic tip according to an embodiment of the present disclosure. As shown in fig. 1, the fluid end 100 includes a valve housing 110 and a first cavity 120 located inside the valve housing 110 and extending in a first direction; the first chamber 120 includes a first end portion 121 and a second end portion 122, the first end portion 121 includes a first screw portion 121A and a first groove 121B, the first groove 121B is located on a side of the first screw portion 141A near the second end portion 122, and the first groove 121B is recessed from an inner sidewall of the first chamber 120 toward the valve housing 110. The first screw part 121A is provided with a screw on an inner side wall thereof, so that it can be fixedly connected to other components by means of the screw.

In the hydraulic end provided by the embodiment of the disclosure, the first groove is arranged on one side of the first thread part close to the second end part, that is, the first groove is arranged at the root of the first thread part, the first groove can be used as a transition structure between the first thread part and the non-thread part in the first end part, and the root of the first thread part can be prevented from generating large alternating stress under the action of high pressure, so that cracks can be relieved or even avoided. Therefore, the hydraulic end can enable the plunger pump adopting the hydraulic end to have longer service life, and can reduce the maintenance cost caused by the generation of cracks in the valve box.

Fig. 2 is an enlarged schematic view of a first groove in a hydraulic tip according to an embodiment of the present disclosure. As shown in fig. 2, the surface of the first groove 121B recessed into the valve housing 110 may be a curved surface, such as a circular arc surface, so that stress concentration may be further prevented, and thus, cracks may be prevented.

In some examples, as shown in fig. 1 and 2, a ratio of a width of the first groove 121B in the first direction to a width of the first threaded portion 121A in the first direction may be 1/8-1/3.

For example, as shown in fig. 2, a ratio of a width of the first groove 121B in the first direction to a width of the first threaded part 121A in the first direction may be 1/5 to 1/4.

In some examples, as shown in fig. 1 and 2, the first groove 121B is an annular groove disposed along an inner sidewall of the first cavity 120, and the diameter of the first groove 121B is greater than the inner diameter of the first end portion 121.

In some examples, as shown in fig. 1, the second end portion 122 includes a second threaded portion 122A and a second groove 122B, the second groove 122B is located on a side of the second threaded portion 122A near the first end portion 121, and the second groove 122B is recessed from an inner sidewall of the first cavity 120 toward the valve housing 110. The second screw portion 122A has a screw thread on an inner side wall thereof, so that it can be fixedly connected to other components by a screw thread. Therefore, the second groove is formed in the side, close to the first end, of the second thread part, namely the second groove is formed in the root of the second thread part, the second groove can serve as a transition structure between the second thread part and the non-thread part in the second end, the root of the second thread part can be prevented from generating large alternating stress under the action of high pressure, and therefore cracks can be relieved and even avoided.

Fig. 3 is an enlarged schematic view of a second groove in a hydraulic tip according to an embodiment of the present disclosure. As shown in fig. 3, the surface of the second groove 122B recessed into the valve housing 110 may be a curved surface, such as a circular arc surface, so that stress concentration may be further prevented, and thus, cracks may be prevented.

In some examples, as shown in fig. 1 and 3, a ratio of a width of the first groove 121B in the first direction to a width of the first threaded part 121A in the first direction may be 0.05 to 0.25.

For example, as shown in fig. 3, a ratio of a width of the first groove 121B in the first direction to a width of the first threaded part 121A in the first direction may be 0.1 to 0.2.

In some examples, as shown in fig. 1 and 3, the second groove 122B is an annular groove disposed along an inner sidewall of the first cavity 120, the second groove 122B having a diameter greater than an inner diameter of the second end 122.

In some examples, as shown in fig. 1, the fluid end 100 further includes a second cavity 130, the second cavity 130 being located inside the valve housing 110 and extending in a second direction, the second direction intersecting the first direction. It should be noted that, although the fluid end shown in fig. 1 shows both the first cavity and the second cavity, the embodiments of the present disclosure include, but are not limited to, this, and the fluid end may also include only the first cavity without providing the second cavity.

For example, as shown in fig. 1, the second cavity 130 intersects the first cavity 120 and is an alternating cavity 140; the first direction and the second direction are perpendicular to each other.

In some examples, as shown in fig. 1, the second cavity 130 includes a third end 131 and a fourth end 132, the third end 131 includes a third threaded portion 131A and a third groove 131B, the third groove 131B is located on a side of the third threaded portion 131A near the fourth end 132, and the third groove 131B is recessed from an inner sidewall of the second cavity 130 toward the valve housing 110. Therefore, the third groove is formed in the side, close to the fourth end, of the third thread part, namely the third groove is formed in the root of the third thread part, the third groove can serve as a transition structure between the third thread part and the non-thread part in the second end, the root of the third thread part can be prevented from generating large alternating stress under the action of high pressure, and therefore cracks can be relieved and even avoided. Therefore, the hydraulic end can enable the plunger pump adopting the hydraulic end to have longer service life, and can reduce the maintenance cost caused by the generation of cracks in the valve box.

Fig. 4 is an enlarged schematic view of a third groove in a hydraulic tip according to an embodiment of the present disclosure. As shown in fig. 4, the surface of the third groove 131B recessed into the valve housing 110 may be a curved surface, such as a circular arc surface, so that stress concentration may be further prevented, and thus, cracks may be prevented.

In some examples, as shown in fig. 1 and 4, a ratio of a width of the third groove 131B in the first direction to a width of the third threaded portion 131A in the first direction may be 0.05-0.25.

For example, as shown in fig. 4, a ratio of a width of the third groove 131B in the first direction to a width of the third screw part 131A in the first direction may be 0.1-0.2.

In some examples, as shown in fig. 1 and 4, the third groove 131B is an annular groove disposed along an inner sidewall of the first cavity 120, and the diameter of the third groove 131B is greater than the inner diameter of the third end 131.

Fig. 5 is a schematic structural diagram of a hydraulic terminal according to an embodiment of the present disclosure. As shown in fig. 5, the fluid end 100 further includes a packing assembly 151 and a packing gland 152; the packing assembly 151 is located at the first end 121; the packing gland 152 is located at the first end 121 and at a side of the packing assembly 151 away from the second end 122; the packing cap 152 is threadedly coupled to the first threaded portion 121A, the packing assembly 151 includes a first central bore 1510, and the packing cap 152 includes a second central bore 1520. In the hydraulic end, a first middle hole in the packing assembly and a second middle hole in the packing pressing cap can be used for placing a plunger; the outer side wall of the packing gland comprises threads, and the inner side wall of the first thread part comprises threads, so that connection and fixation can be realized through meshing of the threads. From this, the packing subassembly can be used to the sealed of plunger, and the packing pressure cap is used for compressing tightly the packing subassembly to realize the sealed of first end.

For example, as shown in fig. 5, the valve housing 110 further includes a lubricating oil passage 119 communicating with the first end portion 121 and configured to be filled with lubricating oil or grease so that a sealed state can be maintained in the reciprocating motion of the plunger.

In some examples, as shown in fig. 5, fluid end 100 further includes a plunger 160, plunger 160 being at least partially located at first end 121A; the plunger 160 is movable within the first central bore 1510 and the second central bore 1520. For example, the plunger 160 may reciprocate in a first direction. The face of the plunger 160 near the second end 122 is spherical. Therefore, in the process that the plunger contacts the fluid, as the surface of the plunger close to the second end part is a spherical surface, the fluid can more smoothly pass through the spherical surface of the plunger, the erosion effect of the fluid on the plunger is reduced, and the service life of the plunger can be prolonged.

In some examples, as shown in fig. 5, an end of the plunger 160 near the second end 122 is provided with a lightening hole 165, so that the weight of the plunger 160 can be reduced to achieve a light weight design.

In some examples, as shown in fig. 5, the end surface of the lightening hole 165 near the second end 122 includes a jackscrew chamfer, so that the machining cost of the welding plug can be saved while the weight of the plunger is reduced.

In some examples, as shown in fig. 5, the fluid end 100 also includes a packing anti-loosening assembly 170 located on the packing cap 152 and configured to prevent the packing cap 152 from loosening. Therefore, the packing anti-loosening assembly 170 can be loosened in the operation process of the plunger pump, so that the risk of jacking the plunger pump in the operation process can be eliminated.

For example, the end of the packing gland 152 is provided with a cylindrical hole, and the packing anti-loosening assembly 170 may include a cylindrical boss that may be placed within the cylindrical hole, so that the packing gland may be prevented from loosening by disposing the cylindrical boss within the cylindrical hole and clamping the cylindrical boss. It should be noted that, the embodiment of the present disclosure does not specifically limit the packing anti-loose assembly, as long as the packing anti-loose assembly can play a role in preventing the packing from loosening.

In some examples, as shown in fig. 5, the packing cap 152 includes packing threads, the first threaded portion 121A includes first threads, and the packing cap 152 and the first threaded portion 121A are coupled by engagement of the packing threads and the first threads, the packing threads and the first threads having a pitch greater than 5 millimeters. From this, press the screw thread of cap and first screw thread portion to set up to coarse thread with the packing, can solve the difficult problem of disassembling of screw thread lock to can reduce the assembly and maintain the degree of difficulty.

In some examples, as shown in fig. 5, the thread pitch of the packing thread and the first thread is greater than 6 millimeters.

In some examples, the inner sidewalls of the first and second end portions 121, 122 may be hardened, such as by carburizing, nitriding, spray welding, or other forms of hardening.

In some examples, as shown in fig. 5, the fluid end 100 further includes a first gland 181 and a first gland 182, each of the first gland 181 and the first gland 182 being located at the second end 122; the first pressing cap 182 is located at the second end 122 and at a side of the first pressing cover 181 far away from the first end 121, and the first pressing cap 182 is connected with the second threaded portion 122A through a thread. The first gland may seal the second end and the first gland may compress the first gland and further seal the second end; therefore, the first pressing cover and the first pressing cap can achieve a good sealing effect.

In some examples, as shown in fig. 5, the fluid end 100 further includes a second gland 191 and a second gland 192, each of the second gland 191 and the second gland 192 being located at the third end 131; the second pressing cap 192 is located on a side of the second pressing cover 191 away from the fourth end 132, and the second pressing cap 182 is screwed with the third screw part 131A. The second gland may seal the third end and the second gland may compress the second gland and further seal the third end; therefore, the second pressing cover and the second pressing cap can achieve a good sealing effect.

In some examples, as shown in fig. 5, the fluid tip 100 further includes an inlet port 230 and an outlet port 240; the liquid inlet 230 may be located at the second end 132 of the second cavity 130. Thus, low pressure liquid can enter the second chamber 130 from the liquid inlet 230, then enter the first chamber 120, be pressurized by the cooperation of the plunger 160 and the valve assembly, be converted into high pressure liquid, and be discharged from the liquid outlet 240.

In some examples, as shown in fig. 5, the fluid end 100 includes a first valve component 251 and a second valve component 152, the first valve component 251 being located at the third end 131 and the second valve component 152 being located at the fourth end 132; the first valve assembly 251 is located on a side of the first gland 181 adjacent the fourth end 132.

In some examples, as shown in fig. 5, first valve assembly 251 and second valve assembly 252 are both one-way valves; the first valve assembly 251 allows fluid from the exterior (e.g., the loading port 230) to enter the second chamber 130, but prevents fluid in the second chamber 130 from flowing out; the second valve assembly 252 allows the fluid in the second cavity 130 to flow out, but prevents the fluid from entering the second cavity 130 from the outside. Thus, as the plunger 160 moves in a reverse stroke (e.g., away from the second end), the volumes of the first chamber 120 and the second chamber 130 within the valve housing 110 gradually increase, creating a partial negative pressure or vacuum; at this time, the first valve assembly 251 is opened, the second valve assembly 252 is closed, and the external fluid enters the first chamber 120 and the second chamber 130; when the plunger 160 returns to the limit position, the interiors of the first and second chambers 120 and 130 are filled with fluid, and a fluid suction process is completed. Then, when the plunger 160 makes a progressive movement, the volumes of the first chamber 120 and the second chamber 130 inside the valve housing 110 gradually decrease, the fluid inside the first chamber 120 and the second chamber 130 is squeezed, and the pressure increases; at this time, the first valve assembly 251 is closed, the second valve assembly 252 is opened, and the fluid inside the valve housing 110 is discharged through the second valve assembly 252; when the plunger 160 is advanced to the limit position, the volumes of the first chamber 120 and the second chamber 130 inside the valve housing 110 are minimized, and a fluid discharge process is completed. Accordingly, the above-described fluid suction process and fluid discharge process are alternately performed by the reciprocating motion of the plunger 160, so that the low-pressure fluid can be continuously converted into the high-pressure fluid and output.

In some examples, as shown in fig. 5, the fluid end 100 includes a valve sleeve 260 disposed at the location of the alternating cavity 140; at this time, the second valve assembly 252 includes a spring seat 252A, a spring 252B, a valve seat 252C, and a valve body 252D; the spring seat 252A is fixed to the valve seat sleeve 260, the spring 252B is sleeved on the spring seat 252A, the valve seat 252C is fixed to the fourth end portion 132, and the valve body 252D is disposed in the valve seat 252C. It should be noted that the specific structure of the first valve component can be referred to the related description of the second valve component. In addition, the first valve component and the second valve component provided by the embodiment of the disclosure include, but are not limited to, the situation shown in fig. 5 as long as the first valve component and the second valve component can realize the function of a one-way valve.

FIG. 6A is a schematic diagram of another fluid end according to an embodiment of the present disclosure; fig. 6B is a schematic cross-sectional view of another fluid end according to an embodiment of the present disclosure. As shown in fig. 6A and 6B, the valve housing 110 includes a first body portion 112 and a second body portion 114, the first cavity 120 extends from the first body portion 112 to the second body portion 114, the first end portion 121 is at least partially located within the first body portion 112, and the second end portion 122 is at least partially located within the second body portion 114; the first main body 112 includes a cavity 1120 and a connecting portion 1122, the first end 121 is at least partially located in the cavity 1120, and the connecting portion 1122 extends from the cavity 1120 outward in a radial direction of the first end 121 and is spaced apart from the second main body 114; valve housing 110 also includes a connecting bore 118 located at connecting portion 1122 and extending through connecting portion 1122. Thus, bolts may be provided on the attachment holes 118 to fixedly attach the fluid end and the power end.

In some examples, as shown in fig. 6A and 6B, the fluid end 100 includes N first cavities 120, the N first cavities 120 being spaced apart along a third direction, the third direction being perpendicular to both the first direction and the second direction; the valve housing 110 includes 2(N +1) connecting holes 118, the diameter of the connecting holes 118 ranges from 1.5 inches to 2.5 inches, and the value of N may range from a positive integer greater than or equal to 1. Therefore, the size of the connecting holes can be increased, the number of the connecting holes can be reduced, and the installation and maintenance difficulty of the plunger pump adopting the hydraulic end can be reduced. It should be noted that, although the number of the first cavities is limited in this example, when the fluid end includes the second cavities, the second cavities are arranged in one-to-one correspondence with the first cavities, that is, the number of the second cavities is also N.

For example, N may take any one of values 3, 4, 5, 6, 7, 8, and 9. That is, the plunger pump using the hydraulic end may be a three-cylinder plunger pump, a four-cylinder plunger pump, a five-cylinder plunger pump, a six-cylinder plunger pump, a seven-cylinder plunger pump, an eight-cylinder plunger pump, or a nine-cylinder plunger pump.

For example, as shown in fig. 6A and 6B, the fluid end 100 includes 5 first cavities 120; at this time, the valve housing 110 includes 12 connection holes 118.

Fig. 7 is a schematic structural diagram of another fluid end according to an embodiment of the present disclosure. As shown in fig. 7, the fluid end 100 includes a lifting latch 200, which is located on the valve housing 110 and is configured to be coupled to a lifting tool. Therefore, the hydraulic end is convenient to install and maintain, and the installation and maintenance difficulty of the plunger pump adopting the hydraulic end can be reduced. On the other hand, the hoisting lock catch can also avoid the danger caused by hoisting other parts of the hydraulic end, and the potential safety hazard is reduced.

In some examples, as shown in fig. 7, the fluid end 100 further includes a flange tee 210 and a drain flange 220, one on each side of the valve housing 110. The bottom of the valve box 110 may be provided with a liquid inlet for inputting low pressure fluid. The flange tee 210 and the discharge flange 210 may be used to output high pressure fluid.

In some examples, as shown in FIG. 7, the flange tees 210 and drain flanges 220 may be selected with large sized bolt holes to accommodate larger, more expensive bolts, thereby further optimizing the load carrying capacity of the anchor bolts. For example, the bolt holes on the flange tee 210 and the exhaust flange 220 may be greater than 2 inches in diameter.

An embodiment of the present disclosure also provides a plunger pump. Fig. 8 is a schematic structural diagram of a plunger pump according to an embodiment of the present disclosure. As shown in fig. 8, plunger pump 500 includes fluid tip 100 of any of the above. Because the plunger pump adopts the hydraulic end provided by the embodiment, the plunger pump has longer service life and can reduce the maintenance cost caused by the crack of the valve box.

In some examples, as shown in fig. 8, the plunger pump 500 further includes a power end 400; power end 400 is connected to fluid end 100. Thus, power end 400 may convert mechanical power provided by a prime mover into reciprocating motion of a plunger, which may effect pressurization of a low-pressure fluid to a high-pressure fluid at power end 100. Of course, the disclosed embodiments include but are not limited to this, and the plunger pump can also directly drive the plunger to reciprocate by using a linear motor.

In some examples, as shown in fig. 8, power end 400 includes a crankshaft linkage 410, a crosshead mechanism 420, and a pull rod 430. Thus, the crankshaft connecting rod mechanism 410 and the crosshead mechanism 420 may convert the rotational motion of the prime mover into the reciprocating motion of the draw rod 430, and the draw rod 430 is connected to the plunger 160, thereby driving the plunger 160 to reciprocate, under the driving of the prime mover.

The following points need to be explained:

(1) in the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are referred to, and other structures may refer to general designs.

(2) Features of the disclosure in the same embodiment and in different embodiments may be combined with each other without conflict.

The above is only a specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and shall be covered by the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims (15)

1. A fluid end, comprising:

a valve box;

the first cavity is positioned inside the valve box and extends along a first direction;

the first cavity comprises a first end part and a second end part, the first end part comprises a first threaded part and a first groove, the first groove is positioned on one side, close to the second end part, of the first threaded part, and the first groove is recessed towards the valve box from the inner side wall of the first cavity.

2. The fluid end of claim 1 wherein the second end portion includes a second threaded portion and a second groove on a side of the second threaded portion adjacent the first end portion, the second groove being recessed from an inner sidewall of the first cavity toward the valve housing.

3. The fluid end of claim 1 wherein the first groove is an annular groove disposed along an inner sidewall of the first cavity, the first groove having a diameter greater than an inner diameter of the first end portion.

4. The fluid end of claim 2 wherein the second groove is an annular groove disposed along an inner sidewall of the first cavity, the second groove having a diameter greater than an inner diameter of the second end portion.

5. The fluid tip of any one of claims 1-4, further comprising:

a second cavity located inside the valve box and extending in a second direction that intersects the first direction,

wherein the second cavity includes a third end portion and a fourth end portion, the third end portion includes a third threaded portion and a third groove, the third groove is located on a side of the third threaded portion close to the fourth end portion, and the third groove is recessed from an inner side wall of the second cavity toward the valve housing.

6. The fluid tip of any one of claims 1-4, further comprising:

a packing assembly located at the first end;

the packing pressing cap is positioned at the first end part and is positioned at one side of the packing assembly, which is far away from the second end part;

the packing pressing cap is connected with the first thread portion through threads, the packing assembly comprises a first middle hole, and the packing pressing cap comprises a second middle hole.

7. The fluid tip of claim 6, further comprising:

a plunger at least partially located at the first end and configured to move within the first intermediate bore and the second intermediate bore,

wherein, the surface of the plunger close to the second end part is a spherical surface.

8. The fluid tip of claim 6, further comprising:

and the packing anti-loosening assembly is positioned on the packing pressing cap and is configured to prevent the packing pressing cap from loosening.

9. The fluid end of claim 6 wherein the packing gland includes packing threads, the first threaded portion includes first threads, and the pitch of the packing threads and the first threads is greater than 5 millimeters.

10. The fluid tip of claim 2, further comprising:

a first gland at the second end; and

a first gland located at the second end and at a side of the first gland away from the first end,

wherein the first pressing cap is connected with the second thread part through threads.

11. The fluid tip of claim 5, further comprising:

a second gland located at the third end; and

a second gland located at the third end and at a side of the second gland away from the fourth end,

wherein the second pressing cap is in threaded connection with the third threaded part.

12. The fluid tip of any one of claims 1-4, wherein the valve housing includes a first body portion and a second body portion, the first cavity extending from the first body portion to the second body portion, the first end portion being at least partially within the first body portion, the second end portion being at least partially within the second body portion,

the first main body part comprises a cavity part and a connecting part, the first end part is at least partially positioned in the cavity part, the connecting part extends outwards from the cavity part along the radial direction of the first end part and is arranged at an interval with the second main body part,

the valve box further comprises a connecting hole which is located in the connecting portion and penetrates through the connecting portion.

13. The fluid tip of claim 12, comprising N of the first cavities spaced apart along a third direction, the third direction being perpendicular to the first direction,

the valve housing includes 2 times the number of the connecting holes as N +1, the diameter of the connecting holes being in the range of 1.5-2.5 inches.

14. The fluid tip of any one of claims 1-4, further comprising:

a lifting latch on the valve box and configured to couple to a lifting tool.

15. A plunger pump, characterized in that it comprises a fluid end according to any one of claims 1-14.

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