CN215672583U - Power end and plunger pump - Google Patents

Abstract

A power end and plunger pump. The power end comprises a crankshaft, a driving gear and a gear shaft; the driving gear is assembled on the crankshaft; the gear shaft includes a shaft portion and a gear portion connected to the shaft portion. The gear part is meshed with the driving gear, and the gear shaft is configured to drive the crankshaft to rotate through the driving gear; the shaft portion includes a first end portion, a middle portion, and a second end portion, the first end portion and the second end portion being located on both sides of the middle portion, a radial dimension of the first end portion and the second end portion being larger than a radial dimension of the middle portion. Therefore, the power end realizes light weight design while enhancing the strength of the gear shaft and the bearing capacity of the gear shaft bearing.

Description

Power end and plunger pump

Technical Field

Embodiments of the present disclosure relate to a power end 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

The disclosed embodiments provide a power end and a plunger pump. The power end comprises a crankshaft, a driving gear and a gear shaft; the driving gear is assembled on the crankshaft; the gear shaft includes a shaft portion and a gear portion connected to the shaft portion. The gear part is meshed with the driving gear, and the gear shaft is configured to drive the crankshaft to rotate through the driving gear; the shaft portion includes a first end portion, a middle portion, and a second end portion, the first end portion and the second end portion being located on both sides of the middle portion, a radial dimension of the first end portion and the second end portion being larger than a radial dimension of the middle portion. Therefore, the strength of the gear shaft can be increased by increasing the radial size of the first end part and the second end part, and the size of the gear shaft bearing corresponding to the gear shaft is increased, so that the bearing capacity of the gear shaft bearing can be improved. On the other hand, because the radial dimension of the first end part and the second end part is larger than that of the middle part, the power end can reduce the mass of the gear shaft while ensuring higher performance of the gear shaft, thereby realizing light-weight design. Therefore, the power end realizes light weight design while enhancing the strength of the gear shaft and the bearing capacity of the gear shaft bearing.

At least one embodiment of the present disclosure provides a power end, comprising: a crankshaft; a driving gear assembled on the crankshaft; a gear shaft including a shaft portion and a gear portion coupled to the shaft portion, the gear portion being engaged with the drive gear, the gear shaft being configured to rotate the crankshaft by the drive gear, the shaft portion including a first end portion, an intermediate portion, and a second end portion, the first end portion and the second end portion being located at both sides of the intermediate portion, a radial dimension of the first end portion and the second end portion being greater than a radial dimension of the intermediate portion.

For example, in the power end provided in an embodiment of the present disclosure, the power end includes two of the driving gears, the gear shaft includes two of the gear portions, one of the two gear portions is located on a side of the first end portion away from the middle portion, and the other of the two gear portions is located on a side of the second end portion away from the middle portion.

For example, in the power end provided by one embodiment of the present disclosure, the radial dimension of the first end portion and the second end portion ranges from 190 mm to 210 mm, and the radial dimension of the middle portion ranges from 180 mm to 200 mm.

For example, in a power end provided in an embodiment of the present disclosure, the gear shaft further includes a driving portion located on a side of the gear portion away from the shaft portion, the driving portion includes: an outer spline structure; and the driving flange is sleeved on the outer spline structure and comprises an inner spline structure matched with the outer spline structure.

For example, in a power end provided in an embodiment of the present disclosure, the power end further includes: the first gear shaft bearing is sleeved at the first end part; and the second gear shaft bearing is sleeved at the second end part.

For example, in a power end provided by an embodiment of the present disclosure, at least one of the first gear shaft bearing and the second gear shaft bearing employs a self-aligning roller bearing.

For example, in a power end provided in an embodiment of the present disclosure, the crankshaft includes a plurality of bell crank structures, and the power end further includes: the connecting rod structure comprises a connecting rod big head, a connecting rod small head and a connecting rod body positioned between the connecting rod big head and the connecting rod small head; the crosshead comprises a crosshead pin shaft; the connecting rod big end is connected with the crank structure, the connecting rod small end is connected with the crosshead pin shaft, and the crosshead pin shaft bush is sleeved on the connecting rod small end and is respectively in contact with the crosshead and the connecting rod small end.

For example, in a power end provided in an embodiment of the present disclosure, the power end further includes: a pull rod coupled to the crosshead and configured to reciprocate a plunger.

For example, in a power end provided by an embodiment of the present disclosure, the power end further includes a power end housing, the crankshaft being at least partially located within the power end housing.

For example, in a power end provided by an embodiment of the present disclosure, the power end housing is made of high strength steel with a yield strength greater than 600 Mpa.

At least one embodiment of the present disclosure also provides a plunger pump, including: the power end of any of the above; and a hydraulic end connected with the power end.

For example, in a plunger pump provided in an embodiment of the present disclosure, the fluid end includes: the valve box comprises a valve box shell and a cavity positioned inside the valve box shell; a plunger at least partially positioned within the cavity and configured to couple to the pull rod of the power end; a valve assembly located within the cavity; the liquid inlet is positioned in the valve box and communicated with the cavity; and the liquid outlet is positioned in the valve box and communicated with the cavity.

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 partial schematic view of a power end provided in accordance with an embodiment of the present disclosure;

FIG. 2 is a schematic illustration of a gear shaft in the power end provided by an embodiment of the present disclosure;

fig. 3 is a schematic cross-sectional view of a plunger pump according to an embodiment of the present disclosure;

FIG. 4 is a schematic view of a linkage structure provided in an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a power end of a plunger pump provided in accordance with an embodiment of the present disclosure;

FIG. 6 is a schematic view of a plunger pump according to an embodiment of the present disclosure; and

fig. 7 is a schematic cross-sectional view of a fluid end 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.

With the continuous development of fracturing technology, plunger pumps for fracturing technology are also continuously developed in the direction of high pressure and large displacement. However, as the working pressure increases and the displacement increases, the plunger pump may experience various forms of structural damage, thereby increasing maintenance costs and decreasing service life. Therefore, it is necessary to enhance the structure of the plunger pump to reduce the maintenance cost of the plunger pump and to improve the stability and the service life of the plunger pump while achieving high pressure and large displacement.

In this regard, the disclosed embodiments provide a power end and plunger pump. The power end comprises a crankshaft, a driving gear and a gear shaft; the driving gear is assembled on the crankshaft; the gear shaft includes a shaft portion and a gear portion connected to the shaft portion. The gear part is meshed with the driving gear, and the gear shaft is configured to drive the crankshaft to rotate through the driving gear; the shaft portion includes a first end portion, a middle portion, and a second end portion, the first end portion and the second end portion being located on both sides of the middle portion, a radial dimension of the first end portion and the second end portion being larger than a radial dimension of the middle portion. Therefore, the strength of the gear shaft can be increased by increasing the radial size of the first end part and the second end part, and the size of the gear shaft bearing corresponding to the gear shaft is increased, so that the bearing capacity of the gear shaft bearing can be improved. On the other hand, because the radial dimension of the first end part and the second end part is larger than that of the middle part, the power end can reduce the mass of the gear shaft while ensuring higher performance of the gear shaft, thereby realizing light-weight design. Therefore, the power end realizes light weight design while enhancing the strength of the gear shaft and the bearing capacity of the gear shaft bearing.

The power end and the plunger pump provided by the embodiment of the disclosure are described in detail below with reference to the accompanying drawings.

An embodiment of the present disclosure provides a power end. FIG. 1 is a partial schematic view of a power end provided in accordance with an embodiment of the present disclosure. Fig. 2 is a schematic view of a gear shaft in a power end provided in an embodiment of the present disclosure. As shown in fig. 1 and 2, the power end 100 includes a crankshaft 110, a drive gear 120, and a gear shaft 130; the driving gear 120 is fitted on the crankshaft 110; the gear shaft 130 includes a shaft portion 132 and a gear portion 134 connected to the shaft portion 132. The gear portion 134 is engaged with the driving gear 120, and the gear shaft 130 is configured to rotate the crankshaft 110 via the driving gear 120; the shaft portion 132 includes a first end portion 1321, a middle portion 1323, and a second end portion 1322, the first end portion 1321 and the second end portion 1322 being located on either side of the middle portion 1323, the first end portion 1321 and the second end portion 1322 having a radial dimension that is greater than a radial dimension of the middle portion 1323. The first end portion 1321 and the second end portion 1322 may be portions where the gear shaft is coupled to the gear shaft bearing. Thus, the shaft portion 132 of the gear shaft 130 has a structure of "large at both ends and small in the middle".

In the power end provided by the embodiment of the disclosure, the strength of the gear shaft can be increased by increasing the radial dimensions of the first end part and the second end part; furthermore, since the first end portion and the second end portion can be the portions where the gear shaft is connected with the gear shaft bearing, the size of the gear shaft bearing corresponding to the gear shaft can be correspondingly increased, i.e. the power end can adopt the gear shaft bearing with larger size, thereby improving the bearing capacity of the gear shaft bearing. On the other hand, because the radial dimension of the first end part and the second end part is larger than that of the middle part, the power end can ensure that the gear shaft has higher performance, and simultaneously can reduce the mass of the gear shaft, thereby realizing light-weight design. Therefore, the power end realizes light weight design while enhancing the strength of the gear shaft and the bearing capacity of the gear shaft bearing.

In some examples, as shown in fig. 1 and 2, fluid end 100 includes two drive gears 120, gear shaft 130 includes two gear portions 134, one of the two gear portions 134 is located on a side of first end portion 1321 away from middle portion 1323, and the other of the two gear portions 134 is located on a side of second end portion 1322 away from middle portion 1323. At this time, two driving gears 120 are respectively provided at both ends of the crankshaft 110, and the gear shaft 130 simultaneously drives the crankshaft 110 to rotate from both ends of the crankshaft 110 through the two driving gears 120.

In some examples, as shown in fig. 1 and 2, the radial dimensions of the first end portion 1321 and the second end portion 1322 range from 190-.

In some examples, as shown in fig. 1 and 2, power end 100 further includes a first gear shaft bearing 141 and a second gear shaft bearing 142; the first gear shaft bearing 141 is disposed at the first end 1321, and the second gear shaft bearing 142 is disposed at the second end 1322. Thereby, the first gear shaft bearing 141 and the second gear shaft bearing 142 may be used to carry the gear shaft 130, and the gear shaft 130 may be rotated.

In some examples, at least one of the first gear shaft bearing 141 and the second gear shaft bearing 142 employs a self-aligning roller bearing. Because the self-aligning roller bearing has the self-aligning performance, the gear shaft is not easily influenced by the installation angle error of the gear shaft and the power end shell or the shaft bending in the operation process, and the normal and stable operation of the gear shaft is ensured.

In some examples, as shown in fig. 1 and 2, the gear shaft 130 further includes a driving portion 136, the driving portion 136 being located on a side of the gear portion 134 remote from the shaft portion 132; drive portion 136 includes an outer spline structure 1361 and a drive flange 1362, with drive flange 1362 fitting over outer spline structure 1361 and drive flange 1362 including an inner spline structure 1363 that mates with outer spline structure 1361. From this, because the driving flange includes internal spline structure, the internal spline structure of driving flange is in the same place with the assembly of the external spline structure on the gear shaft, compares in conventional flat key structure, has solved the problem of the driving flange that leads to because of the interference fit of flat key and flat keyway disassembles the difficulty. It should be noted that the driving flange can be connected with a power output shaft of the power device, and the power device can drive the gear shaft to rotate through the driving flange, so as to drive the crankshaft to rotate.

In some examples, as shown in fig. 1 and 2, the driving portion 136 is located on a side of the gear portion 134 away from the first end 1231, i.e., the driving portion 136 is disposed on a side of the first end 1231. Of course, embodiments of the present disclosure include, but are not limited to, this.

Fig. 3 is a schematic cross-sectional view of a plunger pump according to an embodiment of the present disclosure; fig. 4 is a schematic diagram of a connecting rod structure according to an embodiment of the disclosure. As shown in fig. 3 and 4, the crankshaft 110 includes a plurality of bell crank structures 112; at this point, the power end 100 further includes a linkage structure 150, a crosshead 160, and a crosshead pin bushing 170; the connecting rod structure 150 comprises a large connecting rod head 151, a small connecting rod head 152 and a connecting rod body 153 positioned between the large connecting rod head 151 and the small connecting rod head 152; the crosshead 160 includes a crosshead pin 162; the connecting rod big head 151 is connected with the crank structure 112, the connecting rod small head 152 is connected with the crosshead pin shaft 162, and the crosshead pin bearing bush 170 is sleeved on the connecting rod small head 152 and is respectively arranged in contact with the crosshead 160 and the connecting rod small head 152. Thus, the power end can convert the rotation of the crankshaft into the reciprocating motion of the crosshead through the crankshaft, the connecting rod structure, the crosshead and the crosshead pin bushing. In addition, the load transmission between the connecting rod structure and the crosshead is transmitted through the end surface of the small end of the connecting rod, and the bearing area of the end surface of the small end of the connecting rod is large, so that the bearing capacity of the connecting rod structure can be enhanced; meanwhile, the crosshead pin bearing bush positioned between the connecting rod small end and the crosshead can prolong the service life of the connecting rod small end.

In some examples, as shown in fig. 3 and 4, the drawbar big head 151 may include a link block 1510 to connect with the bell crank structure 112; link holder 1510 may be bolted to link shaft 153.

In some examples, the crosshead pin bushings 170 may be made of a wear resistant material, which may further increase the life of the connecting rod stub.

In some examples, as shown in fig. 3 and 4, the power end 100 further includes a pull rod 180 coupled to the crosshead 160 and configured to reciprocate the plunger.

For example, the tie rod 180 and the cross head 160 may be connected using a bolt structure; of course, embodiments of the present disclosure include, but are not limited to, tie rods and cross heads that may be connected in other ways.

In some examples, as shown in fig. 3 and 4, the power end 100 may further include a crosshead shoe 175, with the crosshead 160 disposed within the crosshead shoe 175.

FIG. 5 is a schematic diagram of a power end of a plunger pump provided in accordance with an embodiment of the present disclosure; fig. 6 is a schematic diagram of a plunger pump according to an embodiment of the disclosure. As shown in fig. 5 and 6, the power end 100 includes a power end housing 190; the crankshaft 110, connecting rod arrangement 150, crosshead 160, and crosshead pin bushings 170 are all disposed in cavities within the power end housing 190.

In some examples, the power end housing 190 may be made of a high strength steel with a yield strength greater than 600Mpa, which may increase the mechanical strength of the power end housing 190 and increase the load carrying capacity of the power end housing 190 structure.

In some examples, as shown in fig. 5 and 6, the power end 100 further includes a gearbox housing 195 disposed outside of the power end housing 190 and forming a gear receiving space 1950 with the power end housing 190 for receiving the drive gear 120 described above.

An embodiment of the present disclosure also provides a plunger pump. As shown in fig. 6, the plunger pump 300 includes a power end 100 and a fluid end 200; the power end 100 may employ the power end 100 provided in any of the examples above; the fluid end 200 is connected to the power end 100. Because the power end realizes light-weight design while enhancing the strength of the gear shaft and the bearing capacity of the gear shaft bearing, the plunger pump also has higher strength and longer service life, and the light-weight design is also realized.

Fig. 7 is a schematic cross-sectional view of a fluid end of a plunger pump according to an embodiment of the present disclosure. As shown in fig. 6 and 7, the fluid end 200 includes a valve housing 210, a plunger 220, an inlet port 230, and an outlet port 240; the valve manifold 210 includes a manifold housing 212 and a cavity 214 located inside the manifold housing 212; a plunger 220 is at least partially disposed within the cavity 214 and is configured to couple to the drawbar 180 of the power end 100; the liquid inlet 230 is located on the valve box 210 and is communicated with the cavity 214; the outlet port 240 is located on the valve housing 210 and is in communication with the cavity 214. Thus, low pressure fluid may enter the chamber 214 from the inlet port 230, be pressurized by the cooperation of the plunger 220 and the valve assembly 250, be converted to high pressure fluid, and be discharged from the outlet port 240.

In some examples, as shown in fig. 7, the cavity 214 of the valve box 210 includes a first cavity 214A extending in a first direction and a second cavity 214B extending in a second direction; the first and second cavities 214A, 214B are arranged to intersect to form alternating cavities 214C at the locations where the first and second cavities 214A, 214B intersect.

In some examples, as shown in fig. 7, one end of the first chamber 214A is provided with a first sealing assembly 260, and the other end of the first chamber 214A is provided with the plunger 220, as described above, and the plunger 220 can reciprocate within the first chamber 214A. The first seal assembly 260 includes a first gland 261 and a first gland 262.

In some examples, as shown in fig. 7, the valve assembly 250 includes a first valve assembly 251 and a second valve assembly 252; the first valve assembly 251 is disposed at one end of the second chamber 214B, the second sealing assembly 270 and the second valve assembly 252 are disposed at one end of the second chamber 214B, and the second valve assembly 252 is disposed on a side of the second sealing assembly 270 adjacent to the alternating chamber 214C. The second seal assembly 270 includes a second gland 271 and a second gland 272.

In some examples, as shown in fig. 7, the first valve assembly 251 is a one-way valve that allows fluid to enter the second cavity 214B from the outside (e.g., the inlet port 230) but allows fluid in the second cavity 214B to flow out, and the second valve assembly 252 is also a one-way valve that allows fluid in the second cavity 214B to flow out but prevents fluid from entering the second cavity 214B from the outside.

The working principle of the plunger pump is as follows: under the driving of the power device, the gear shaft 130 of the power end 100 drives the crankshaft 110 to rotate through the driving gear 120, and the rotation of the crankshaft 110 drives the pull rod 180 to reciprocate through the connecting rod structure 150 and the crosshead 160; the pull rod 180 reciprocates the plunger 220. As the plunger 220 moves in a reverse stroke (e.g., toward the crankshaft 110), the volume of the cavity 214 inside the valve housing 210 gradually increases, creating a partial negative pressure or vacuum; at this time, the first valve component 251 is opened, the second valve component 252 is closed, and the external fluid enters the cavity 214; when the plunger 220 is returned to the limit position, the interior of the chamber 214 is filled with fluid, completing a fluid intake process. Then, when the plunger 220 performs a progressive movement, the volume of the cavity 214 inside the valve housing 210 gradually decreases, the fluid inside the cavity 214 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 210 is discharged through the second valve assembly 252; when the plunger 220 is advanced to the limit position, the volume inside the valve housing 210 is minimized, completing a fluid discharge process. Accordingly, the above-described fluid suction process and fluid discharge process are alternately performed by the reciprocating motion of the plunger 220, so that the low-pressure fluid can be continuously converted into the high-pressure fluid and output.

In some examples, as shown in fig. 7, the first valve assembly 251 includes a spring seat 251A, a first spring seat 251E, a first spring 251B, a first valve seat 251D, and a first valve body 251C between the first spring seat 251A and the first valve seat 251D; the first valve component 251 can realize the function of a one-way valve through the cooperation of the first spring seat sleeve 251A, the first spring 251B, the first valve body 251C and the first valve seat 251D.

In some examples, as shown in fig. 7, the second valve assembly 252 includes a second spring seat 252A, a second spring 252B, a second valve seat 252D, and a second valve body 252C positioned between the second spring seat 252A and the second valve seat 252D. Through the cooperation of the second spring seat sleeve 252A, the second spring 252B, the second valve body 252C and the second valve seat 252D, the second valve assembly 252 can realize the function of a one-way valve.

In some examples, the plunger pump 300 may have a power in the range of 2000-3000 horsepower, such as 2500 horsepower.

In some examples, the stroke of the plunger pump 300 ranges from 190.5mm to 215.9 mm; the reduction ratio of the plunger pump 300 ranges from 6: 1 to 6.5: 1; of course, the disclosed embodiments include but are not limited to this, and the stroke and the reduction ratio of the plunger pump may be set according to actual conditions.

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 (12)

1. A power end, comprising:

a crankshaft;

a driving gear assembled on the crankshaft;

a gear shaft including a shaft portion and a gear portion connected to the shaft portion,

wherein the gear portion is engaged with the driving gear, the gear shaft is configured to drive the crankshaft to rotate through the driving gear, the shaft portion includes a first end portion, a middle portion and a second end portion, the first end portion and the second end portion are located on both sides of the middle portion, and a radial dimension of the first end portion and the second end portion is greater than a radial dimension of the middle portion.

2. The power end of claim 1 wherein the fluid end includes two of the drive gears and the gear shaft includes two of the gear portions, one of the two gear portions being located on a side of the first end portion remote from the intermediate portion and the other of the two gear portions being located on a side of the second end portion remote from the intermediate portion.

3. The power end of claim 1, wherein the radial dimensions of the first and second end portions range from 190-210 mm, and the radial dimensions of the intermediate portion range from 180-200 mm.

4. The power end of any of claims 1-3, wherein the gear shaft further comprises a drive portion located on a side of the gear portion remote from the shaft portion, the drive portion comprising:

an outer spline structure; and

a driving flange sleeved on the outer spline structure,

wherein the drive flange includes an internal spline structure that mates with the external spline structure.

5. The power end according to any one of claims 1-3, further comprising:

the first gear shaft bearing is sleeved at the first end part; and

and the second gear shaft bearing is sleeved at the second end part.

6. The power end of claim 5, wherein at least one of the first gear shaft bearing and the second gear shaft bearing is a self-aligning roller bearing.

7. The power end of any of claims 1-3, wherein the crankshaft comprises a plurality of bell crank configurations, the power end further comprising:

the connecting rod structure comprises a connecting rod big head, a connecting rod small head and a connecting rod body positioned between the connecting rod big head and the connecting rod small head;

the crosshead comprises a crosshead pin shaft; and

a cross head pin bearing bush is arranged on the cross head pin,

the connecting rod big end is connected with the crank structure, the connecting rod small end is connected with the crosshead pin shaft, and the crosshead pin shaft bush is sleeved on the connecting rod small end and is respectively in contact with the crosshead and the connecting rod small end.

8. The power end of claim 7, further comprising:

a pull rod coupled to the crosshead and configured to reciprocate a plunger.

9. The power end of any of claims 1-3, further comprising a power end housing, the crankshaft being at least partially located within the power end housing.

10. The power end as claimed in claim 9, wherein the power end housing is formed of a high strength steel having a yield strength greater than 600 Mpa.

11. A plunger pump, comprising:

the power end of any of claims 1-10; and

and the hydraulic end is connected with the power end.

12. The plunger pump of claim 11, wherein the fluid end comprises:

the valve box comprises a valve box shell and a cavity positioned inside the valve box shell;

a plunger at least partially positioned within the cavity and configured to couple to the pull rod of the power end;

a valve assembly located within the cavity;

the liquid inlet is positioned in the valve box and communicated with the cavity; and

and the liquid outlet is positioned in the valve box and communicated with the cavity.

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