The power end of a plunger pump and a plunger pump with it

Abstract

This invention discloses a plunger pump power end and a plunger pump having the same. The plunger pump power end includes a first-stage transmission assembly and a second-stage transmission assembly. The first-stage transmission assembly includes a first transmission member and a second transmission member, which mesh with each other. The rotation direction of the first transmission member is parallel to the rotation direction of the second transmission member. The second-stage transmission assembly includes a connected herringbone gear assembly and a crankshaft, with the herringbone gear assembly meshing with the second transmission member. The plunger pump power end of this invention has advantages such as long service life and ease of design and manufacturing.

Description

Technical Field

[0001] This invention relates to the field of plunger pump technology, and more specifically to a plunger pump power end and a plunger pump having the same. Background Technology

[0002] Plunger pumps are used in fracturing pumps, cementing pumps, emulsion pumps, spray pumps, and more. In related technologies, there are increasingly longer requirements for the replacement cycle of vulnerable parts in plunger pumps (replacing vulnerable parts as few times as possible within a certain working cycle). For example, to improve fracturing efficiency, increase fracturing revenue, and reduce operation and maintenance costs, the service life of vulnerable parts in fracturing pumps is required to be longer. Summary of the Invention

[0003] This invention is based on the inventor's discoveries and understanding of the following facts and problems:

[0004] To extend the service life of vulnerable parts in plunger pumps, domestic plunger pump manufacturers have adopted methods such as increasing the stroke and reducing the stroke rate, while ensuring the pump power remains unchanged or is designed for greater operating power. Field verification has shown that reducing the stroke rate significantly extends the life of vulnerable parts. Reducing the stroke rate can be achieved by increasing the gear ratio in the reduction mechanism; however, a large gear ratio significantly increases the outer diameter of the large gear in a single-stage transmission gear pair, thus greatly increasing the maximum external dimensions of the plunger pump, which is detrimental to the realization of large-stroke designs.

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, embodiments of the present invention provide a plunger pump power end to extend the service life of the plunger pump power end.

[0007] Embodiments of the present invention provide a plunger pump to extend the service life of the plunger pump.

[0008] The plunger pump power end of this invention includes: a first-stage transmission assembly, which includes a first transmission member and a second transmission member, wherein the first transmission member meshes with the second transmission member, and the rotation direction of the first transmission member is parallel to the rotation direction of the second transmission member; and a second-stage transmission assembly, which includes a connected herringbone gear assembly and a crankshaft, wherein the herringbone gear assembly meshes with the second transmission member.

[0009] The plunger pump power end of this invention has advantages such as long service life and ease of design and manufacturing.

[0010] In some embodiments, the power end of the plunger pump further includes a reduction gearbox; the first transmission component includes a first transmission shaft and a first helical cylindrical gear, the first helical cylindrical gear being disposed on the first transmission shaft, and the first transmission shaft being pivotally connected to the reduction gearbox; the second transmission component includes a second transmission shaft and a second helical cylindrical gear, the second helical cylindrical gear being disposed on the second transmission shaft, and the second transmission shaft being pivotally connected to the reduction gearbox, wherein the first helical cylindrical gear meshes with the second helical cylindrical gear.

[0011] In some embodiments, the system further includes: a first cylindrical roller bearing and two first tapered roller bearings, one end of the first drive shaft being pivotally connected to the gearbox via the first cylindrical roller bearings, and the other end of the first drive shaft being pivotally connected to the gearbox via the two first tapered roller bearings, the two first tapered roller bearings being mounted face-to-face; a second cylindrical roller bearing and two second tapered roller bearings, one end of the second drive shaft being pivotally connected to the gearbox via the second cylindrical roller bearings, and the other end of the second drive shaft being pivotally connected to the gearbox via the two second tapered roller bearings, the two second tapered roller bearings being mounted face-to-face.

[0012] In some embodiments, the second drive shaft is a gear shaft, and the second drive shaft includes a herringbone gear segment that meshes with the herringbone gear assembly.

[0013] In some embodiments, the herringbone gear assembly includes: a hub fitted on the crankshaft; a left-hand herringbone gear and a right-hand herringbone gear, the left-hand herringbone gear and the right-hand herringbone gear being fitted on the hub, both of the left-hand herringbone gear and the right-hand herringbone gear meshing with the herringbone gear segment.

[0014] In some embodiments, the herringbone gear assembly further includes a spline sleeve, the outer peripheral wall of which has an external spline and the inner peripheral wall of which has an internal spline. The outer peripheral wall of the spline sleeve mates with the inner peripheral wall of the hub, and the inner peripheral wall of the spline sleeve mates with the crankshaft.

[0015] In some embodiments, the wheel hub further includes two third cylindrical roller bearings, one end of which is pivotally connected to the gearbox via one of the third cylindrical roller bearings, and the other end of which is pivotally connected to the gearbox via the other third cylindrical roller bearing, the two third cylindrical roller bearings having a floating clearance in the axial direction of the wheel hub.

[0016] In some embodiments, a guide assembly is further included, the guide assembly comprising: a guide housing connected to the reduction gearbox; a crosshead connecting rod assembly and a pull rod, the crosshead connecting rod assembly being disposed within the guide housing and connected to the crankshaft, and the crosshead connecting rod assembly being connected to the pull rod to drive the pull rod to reciprocate.

[0017] In some embodiments, the first-stage transmission assembly is located below the guide housing.

[0018] The plunger pump of this invention includes: a power end, which is the plunger pump power end described in any of the above embodiments; and a hydraulic end, which includes a plunger, and the crankshaft is drivenly connected to the plunger.

[0019] The plunger pump of this invention has advantages such as long service life and ease of design and manufacturing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the power end of the plunger pump according to an embodiment of the present invention.

[0021] Figure 2 This is an exploded view of the power end of the plunger pump according to an embodiment of the present invention.

[0022] Figure 3 This is an exploded view of the power end of a plunger pump, representing another embodiment of the present invention.

[0023] Figure 4 This is a partial structural diagram of the piston pump power end according to an embodiment of the present invention.

[0024] Figure 5 yes Figure 2 The sectional view of the main view.

[0025] Figure 6 This is a schematic diagram of the first transmission component at the power end of the plunger pump according to an embodiment of the present invention.

[0026] Figure 7 This is a schematic diagram of the herringbone gear assembly at the power end of the plunger pump according to an embodiment of the present invention.

[0027] Figure 8 This is an exploded view of the herringbone gear assembly at the power end of the plunger pump according to an embodiment of the present invention.

[0028] Figure 9 This is a schematic diagram of the spline sleeve on the power end of the plunger pump according to an embodiment of the present invention.

[0029] Figure label:

[0030] 100. Power end of plunger pump;

[0031] 1. Gearbox housing; 101. Bearing housing;

[0032] 2. First-stage transmission assembly; 201. First transmission component; 2011. First transmission shaft; 2012. First helical cylindrical gear; 202. Second transmission component; 2021. Second transmission shaft; 2022. Second helical cylindrical gear; 2023. Herringbone gear segment; 204. First cylindrical roller bearing; 205. First tapered roller bearing; 206. Second cylindrical roller bearing; 207. Second tapered roller bearing;

[0033] 3. Second-stage transmission assembly; 301. Herringbone gear assembly; 3011. Hub; 3012. Left-hand herringbone gear; 3013. Right-hand herringbone gear; 3014. Spline sleeve; 30141. External spline; 30142. Internal spline; 30143. Retaining ring groove; 3015. Third cylindrical roller bearing; 3016. Screw; 3017. Nut; 3018. Anti-loosening washer; 3019. Retaining ring; 302. Crankshaft; 3021. First crankshaft; 3022. Second crankshaft; 303. Guide assembly; 3031. First guide housing; 3032. First crosshead connecting rod assembly; 3033. First tie rod; 3034. Second guide housing; 3035. Second crosshead connecting rod assembly; 3036. Second tie rod; 304. First crankshaft housing; 305. Second crankshaft housing. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] The following is a reference appendix. Figures 1 to 9 The description includes a plunger pump power end 100 and a plunger pump according to an embodiment of the present invention.

[0036] like Figures 1 to 9 As shown, the power end 100 of the plunger pump includes a first-stage transmission assembly 2 and a second-stage transmission assembly 3. The first-stage transmission assembly 2 includes a first transmission member 201 and a second transmission member 202, which mesh with each other, and the rotation direction of the first transmission member 201 is parallel to the rotation direction of the second transmission member 202. The second-stage transmission assembly 3 includes a herringbone gear assembly 301 and a crankshaft 302, which mesh with the second transmission member 202.

[0037] The plunger pump power end 100 of this embodiment of the invention is used as the power end of a fracturing pump, cementing pump, emulsion pump, or spray pump.

[0038] The plunger pump with the plunger pump power end 100 of the present invention adopts a two-stage transmission reduction including a first-stage transmission component 2 and a second-stage transmission component 3, which can make the transmission of the plunger pump power end 100 more stable, the structure of the plunger pump power end 100 more reasonable, and can increase the plunger pump stroke, reduce the plunger pump stroke, and significantly extend the service life of the plunger pump wear parts.

[0039] In addition, the second-stage transmission assembly 3 (second-stage transmission) adopts a herringbone gear pair to cancel out axial forces. In the design of the support bearing of the herringbone gear assembly 301, there is no need to consider axial forces, which greatly simplifies the bearing selection and further facilitates the design of the piston pump power end 100.

[0040] Therefore, the plunger pump power end 100 of the present invention has advantages such as long service life and ease of design and manufacturing.

[0041] The plunger pump with the plunger pump power end 100 of the present invention has advantages such as long service life and ease of design and manufacturing.

[0042] Optionally, the crankshaft 302 includes a first crankshaft 3021 and a second crankshaft 3022, which are respectively disposed on both axial sides of the herringbone gear assembly 301.

[0043] Since the first crankshaft 3021 and the second crankshaft 3022 are respectively arranged on both sides of the axial direction of the herringbone gear assembly 301, the first crankshaft 3021 and the second crankshaft 3022 can correspond to different numbers of cylinders. For example, the first crankshaft 3021 and the second crankshaft 3022 can correspond to two cylinders, three cylinders, and four cylinders, respectively (the corresponding hydraulic ends are also designed as two parts, designed as two cylinders, three cylinders, and four cylinders, respectively). For a five-cylinder plunger pump, the plunger pump power end 100 can be realized by a combination of two cylinders and three cylinders; for a six-cylinder plunger pump, the plunger pump power end 100 can be realized by a combination of three cylinders and three cylinders; for a seven-cylinder plunger pump, the plunger pump power end 100 can be realized by a combination of three cylinders and four cylinders.

[0044] This facilitates the modular design of the plunger pump power end 100 and makes the processing and manufacturing of the plunger pump power end 100 easier.

[0045] In some embodiments, the piston pump power end 100 includes a reduction gearbox 1, and at least a portion of the first-stage transmission assembly 2 and the second-stage transmission assembly 3 are disposed within the reduction gearbox 1.

[0046] Optionally, such as Figures 1 to 5As shown, the first transmission component 201 includes a first transmission shaft 2011 and a first helical cylindrical gear 2012. The first helical cylindrical gear 2012 is mounted on the first transmission shaft 2011, which is pivotally connected to the reduction gearbox 1. The second transmission component 202 includes a second transmission shaft 2021 and a second helical cylindrical gear 2022. The second helical cylindrical gear 2022 is mounted on the second transmission shaft 2021, which is pivotally connected to the reduction gearbox 1. The first helical cylindrical gear 2012 meshes with the second helical cylindrical gear 2022.

[0047] It is understandable that the first transmission component 201 and the second transmission component 202 transmit power through helical cylindrical gear transmission. The first transmission component 201 and the second transmission component 202 have strong load-bearing capacity and can improve the smoothness of transmission between the first transmission component 201 and the second transmission component 202.

[0048] Optionally, the first helical cylindrical gear 2012 and the first drive shaft 2011 are integrally formed. In other words, the first helical cylindrical gear 2012 and the first drive shaft 2011 form a gear shaft.

[0049] Optionally, the second helical cylindrical gear 2022 is detachably mounted on the second drive shaft 2021.

[0050] Optionally, the piston pump power end 100 further includes a first cylindrical roller bearing 204, two first tapered roller bearings 205, a second cylindrical roller bearing 206, and two second tapered roller bearings 207. One end of the first drive shaft 2011 is pivotally connected to the reduction gearbox 1 via the first cylindrical roller bearing 204, and the other end of the first drive shaft 2011 is pivotally connected to the reduction gearbox 1 via the two first tapered roller bearings 205, which are mounted face-to-face. One end of the second drive shaft 2021 is pivotally connected to the reduction gearbox 1 via the second cylindrical roller bearing 206, and the other end of the second drive shaft 2021 is pivotally connected to the reduction gearbox 1 via the two second tapered roller bearings 207, which are mounted face-to-face.

[0051] For example, such as Figure 5 As shown, the left end of the first drive shaft 2011 is pivotally connected to the gearbox 1 via a first cylindrical roller bearing 204, and the right end of the first drive shaft 2011 is pivotally connected to the gearbox 1 via a pair of first tapered roller bearings 205. The left end of the second drive shaft 2021 is pivotally connected to the gearbox 1 via a pair of second tapered roller bearings 207, and the right end of the second drive shaft 2021 is pivotally connected to the gearbox 1 via a second cylindrical roller bearing 206.

[0052] Considering that the meshing of the first helical spur gear 2012 and the second helical spur gear 2022 will generate axial force, and that the left end of the first drive shaft 2011 and the right end of the second drive shaft 2021 will bear larger loads, cylindrical roller bearings with higher load-bearing capacity for the same size are used to position these ends (the left end of the first drive shaft 2011 and the right end of the second drive shaft 2021). Furthermore, to limit the axial movement of the first drive shaft 2011 and the second drive shaft 2021, tapered roller bearings mounted face-to-face are used at the right end of the first drive shaft 2011 and the left end of the second drive shaft 2021, respectively.

[0053] This is beneficial to improving the transmission smoothness of the plunger pump power end 100 and improving the working reliability of the plunger pump with the plunger pump power end 100.

[0054] Optionally, the first cylindrical roller bearing 204 and the second cylindrical roller bearing 206 are NU type cylindrical roller bearings.

[0055] Optionally, such as Figure 5 and Figure 6 As shown, the second drive shaft 2021 is a gear shaft, and the second drive shaft 2021 includes a herringbone gear segment 2023, which meshes with the herringbone gear assembly 301.

[0056] In this embodiment of the invention, the first stage of transmission of the plunger pump power end adopts a helical gear pair, and the second stage of transmission adopts a herringbone gear pair to achieve two-stage transmission speed reduction. Under the same or greater speed ratio, the outer diameter of the herringbone gear assembly 301 will be smaller, which makes it easier to achieve the design of maximizing the plunger pump stroke.

[0057] Optionally, the herringbone gear assembly 301 includes a hub 3011, a left-hand herringbone gear 3012, and a right-hand herringbone gear 3013, with the hub 3011 mounted on the crankshaft 302. The left-hand herringbone gear 3012 and the right-hand herringbone gear 3013 are mounted on the hub 3011, and both the left-hand herringbone gear 3012 and the right-hand herringbone gear 3013 mesh with the herringbone gear segment 2023.

[0058] For example, such as Figure 5 As shown, the left side of the hub 3011 is fitted onto the first crankshaft 3021, and the right side of the hub 3011 is fitted onto the second crankshaft 3022.

[0059] Optionally, such as Figure 7 and Figure 8As shown, the hub 3011 has multiple first connecting holes, which are evenly distributed circumferentially around the hub 3011. The herringbone left-hand gear 3012 has multiple second connecting holes, which are evenly distributed circumferentially around the herringbone left-hand gear 3012. The herringbone right-hand gear 3013 has multiple third connecting holes, which are evenly distributed circumferentially around the herringbone right-hand gear 3013. These correspond one-to-one. The herringbone gear assembly 301 also includes an anti-loosening washer 3018, multiple screws 3016, and multiple nuts 3017. The anti-loosening washer 3018 has multiple fourth connecting holes. The multiple first connecting holes, multiple second connecting holes, multiple third connecting holes, multiple fourth connecting holes, multiple screws 3016, and multiple nuts 3017 correspond one-to-one. The screw 3016 passes sequentially through the corresponding third connecting hole, first connecting hole, second connecting hole, and fourth connecting hole and connects with the corresponding nut 3017, fixing the herringbone left-hand gear 3012 and herringbone right-hand gear 3013 onto the hub 3011. This improves the reliability of the herringbone gear assembly 301 after assembly.

[0060] The second-stage transmission of the plunger pump power end 100 in this invention adopts a combined herringbone gear (herringbone gear assembly 301), which eliminates the need to consider the width of the hob groove in the middle of the overall herringbone gear. This allows for the design and manufacture of gears with smaller tooth widths, thereby facilitating a further reduction in the length of the plunger pump power end 100.

[0061] Optionally, such as Figure 5 As shown, the piston pump power end 100 also includes two third cylindrical roller bearings 3015. One end of the hub 3011 is pivotally connected to the gearbox 1 via one of the third cylindrical roller bearings 3015. The other end of the hub 3011 is pivotally connected to the gearbox 1 via the other third cylindrical roller bearing 3015. The two third cylindrical roller bearings 3015 have a floating clearance in the axial direction of the hub 3011.

[0062] For example, such as Figure 5 As shown, two third cylindrical roller bearings 3015 are respectively located on the left and right sides of the hub 3011. Two bearing seats 101 are connected to the gearbox body 1, located on the left and right sides of the hub 3011 respectively. The third cylindrical roller bearing 3015 on the left is installed between the left bearing seat 101 and the hub 3011, and the third cylindrical roller bearing 3015 on the right is installed between the right bearing seat 101 and the hub 3011.

[0063] Optionally, the third cylindrical roller bearing 3015 is an NJ type cylindrical roller bearing. The paired NJ type bearings can be designed with a certain floating clearance in the axial direction, allowing the herringbone gear assembly 301 to "automatically center" under the action of the herringbone gear segment 2023, finding the optimal meshing position. Furthermore, the herringbone gear assembly 301 is supported by two identical cylindrical rollers with separable outer and inner rings, facilitating installation and providing high load-bearing capacity.

[0064] Optionally, the herringbone gear assembly 301 further includes a spline sleeve 3014, the outer peripheral wall of which has an external spline 30141, and the inner peripheral wall of which has an internal spline 30142. The outer peripheral wall of the spline sleeve 3014 mates with the inner peripheral wall of the hub 3011. The inner peripheral wall of the spline sleeve 3014 mates with the crankshaft 302.

[0065] For example, such as Figure 5 and Figure 9 As shown, the inner circumferential wall of the hub 3011 has internal splines. The external splines 30141 of the spline sleeve 3014 mate with the internal splines of the hub 3011, achieving an anti-rotation connection between the hub 3011 and the spline sleeve 3014. The left side of the internal splines 30142 of the spline sleeve 3014 mates with the first crankshaft 3021, and the right side of the internal splines 30142 of the spline sleeve 3014 mates with the second crankshaft 3022, achieving a circumferential anti-rotation connection between the hub 3011 and the first crankshaft 3021 and the second crankshaft 3022.

[0066] Optionally, such as Figure 5 and Figure 9 As shown, the inner peripheral wall of the spline sleeve 3014 has a retaining ring groove 30143, and a retaining ring 3019 is provided in the retaining ring groove 30143. The retaining ring 3019 is used to restrict the left and right movement of the first crankshaft 3021 and the second crankshaft 3022, so as to stably transmit the torque of the herringbone gear assembly 301 to the first crankshaft 3021 and the second crankshaft 3022.

[0067] This results in good transmission smoothness of the piston pump's power end 100, and it is easy to manufacture and process, with low operating costs.

[0068] In some embodiments, the plunger pump power end 100 includes a first crankshaft housing 304 and a second crankshaft housing 305. The first crankshaft housing 304 is connected to the reduction gearbox 1, and a first crankshaft 3021 is disposed within the first crankshaft housing 304. The second crankshaft housing 305 is connected to the reduction gearbox 1, and a second crankshaft 3022 is disposed within the second crankshaft housing 305. The first crankshaft housing 304 and the second crankshaft housing 305 are located on opposite sides of the reduction gearbox 1 along the axial direction of the herringbone gear assembly 301.

[0069] In this embodiment of the invention, the plunger pump power end 100 has a reduction gearbox 1 located in the middle. The crankshaft housing is divided into two parts: a first crankshaft housing 304 and a second crankshaft housing 305, which are respectively designed on the left and right sides of the reduction gearbox 1. Therefore, the first crankshaft housing 304 and the second crankshaft housing 305 can be designed as two-cylinder, three-cylinder, and four-cylinder units, respectively (the corresponding hydraulic end is also designed as two parts, respectively, as two-cylinder, three-cylinder, and four-cylinder units), further facilitating the modular design of the plunger pump power end 100 and simplifying its manufacturing.

[0070] In some embodiments, such as Figures 1 to 4 As shown, the piston pump power end 100 also includes a guide assembly 303, which includes a guide housing, a crosshead connecting rod assembly, and a tie rod. The guide housing is connected to the reduction gearbox 1. The crosshead connecting rod assembly is located in the guide housing and is connected to the crankshaft 302. The crosshead connecting rod assembly is also connected to the tie rod to drive the tie rod to reciprocate.

[0071] For example, such as Figures 1 to 4 As shown, the guide housing includes a first guide housing 3031 and a second guide housing 3034; the crosshead connecting rod assembly includes a first crosshead connecting rod assembly 3032 and a second crosshead connecting rod assembly 3035; and the pull rod includes a first pull rod 3033 and a second pull rod 3036. The first guide housing 3031 is connected to the first crankshaft housing 304. The first crosshead connecting rod assembly 3032 is disposed within the first guide housing 3031 and is connected to the first crankshaft 3021 and the first pull rod 3033, thereby driving the first pull rod 3033 to reciprocate. The first guide housing 3031 is connected to the second crankshaft housing 305. The second crosshead connecting rod assembly 3035 is located inside the second guide housing 3034. The second crosshead connecting rod assembly 3035 is connected to the second crankshaft 3022 and to the second pull rod 3036 to drive the second pull rod 3036 to reciprocate.

[0072] like Figures 1 to 4 As shown, the first guide box 3031 and the second guide box 3034 can be configured as two-cylinder, three-cylinder or four-cylinder as needed. At the same time, the first guide box 3031 and the second guide box 3034 with different numbers of cylinders can be combined according to actual design needs to meet different application scenarios of the plunger pump, thereby improving the application range of the plunger pump and reducing design and production costs.

[0073] For example, the first guide housing 3031 is configured as a three-cylinder unit, and the second guide housing 3034 is configured as a two-cylinder unit. The corresponding plunger pump is a five-cylinder unit.

[0074] Optionally, such as Figure 5 As shown, the first-stage transmission assembly 1 is located below the first guide box 3031 and the second guide box 3034.

[0075] This design allows the first-stage transmission assembly 1 to not occupy the overall length of the plunger pump, resulting in a smaller and more compact pump in terms of length. Furthermore, the two-stage transmission design facilitates adjustments to the spatial position of the plunger pump's input shaft. When the plunger pump is a fracturing pump, it also improves the connection design between the fracturing pump and the output shafts of the engine and hydraulic transmission on the fracturing vehicle chassis.

[0076] The plunger pump in this embodiment of the invention is a reciprocating plunger pump, which includes a power end and a hydraulic end. The power end is the plunger pump power end described in any of the above embodiments. The hydraulic end includes a plunger, and the crankshaft 302 is drivenly connected to the plunger.

[0077] For example, the plunger includes a first plunger and a second plunger. A first crankshaft 3021 is driven to the first plunger, and a second crankshaft 3022 is driven to the second plunger, so that the crankshafts at the power end (the first crankshaft and the second crankshaft) drive the plungers at the hydraulic end (the first plunger and the second plunger) to reciprocate. Specifically, the first crankshaft 3021 is connected to the first plunger via a first tie rod 3033, and the second crankshaft 3022 is connected to the second plunger via a second tie rod 3036.

[0078] Piston pumps can be used as fracturing pumps, cementing pumps, emulsion pumps, spray pumps, etc.

[0079] Optionally, both the first plunger and the second plunger may be provided in multiples.

[0080] The plunger pump of the present invention has the following advantages:

[0081] The two-stage transmission reduction configuration reduces the outer diameter of the final drive gear (herringbone gear assembly 301) of the plunger pump, thereby minimizing the pump's width, height, stroke, and frequency, and extending its service life. This extends the lifespan of easily worn components such as the valve body, valve seat, packing seal, and plunger. The modular design of the reciprocating plunger reduces design and production costs. Positioning the input shaft (first drive shaft 2011) below the guide housing reduces the overall length of the plunger pump, facilitating the overall design of fracturing trucks, fracturing skids, or pump units.

[0082] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0083] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0084] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0085] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0086] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A power end for a plunger pump, characterized in that, include: A first-stage transmission assembly includes a first transmission member and a second transmission member, wherein the first transmission member meshes with the second transmission member, and the rotation direction of the first transmission member is parallel to the rotation direction of the second transmission member; and The second-stage transmission assembly includes a connected herringbone gear assembly and a crankshaft, wherein the herringbone gear assembly meshes with the second transmission member. The power end of the plunger pump also includes a reduction gearbox; The first transmission component includes a first transmission shaft and a first helical cylindrical gear, the first helical cylindrical gear being disposed on the first transmission shaft, and the first transmission shaft being pivotally connected to the reduction gearbox. The second transmission component includes a second transmission shaft and a second helical cylindrical gear. The second helical cylindrical gear is mounted on the second transmission shaft, which is pivotally connected to the reduction gearbox. The first helical cylindrical gear meshes with the second helical cylindrical gear. The second drive shaft is a gear shaft, and the second drive shaft includes a herringbone gear segment, which meshes with the herringbone gear assembly; The herringbone gear assembly includes: A wheel hub, which is fitted onto the crankshaft; as well as A herringbone left-handed gear and a herringbone right-handed gear are fitted onto the hub, and both the herringbone left-handed gear and the herringbone right-handed gear mesh with the herringbone gear segment.

2. The power end of the plunger pump according to claim 1, characterized in that, Also includes: A first cylindrical roller bearing and two first tapered roller bearings are used. One end of the first drive shaft is pivotally connected to the gearbox via the first cylindrical roller bearing, and the other end of the first drive shaft is pivotally connected to the gearbox via the two first tapered roller bearings. The two first tapered roller bearings are mounted face-to-face. The second drive shaft has a second cylindrical roller bearing and two second tapered roller bearings. One end of the second drive shaft is pivotally connected to the gearbox via the second cylindrical roller bearing, and the other end of the second drive shaft is pivotally connected to the gearbox via the two second tapered roller bearings. The two second tapered roller bearings are installed face to face.

3. The power end of the plunger pump according to claim 2, characterized in that, The herringbone gear assembly also includes a spline sleeve, the outer peripheral wall of which has an external spline and the inner peripheral wall of which has an internal spline. The outer peripheral wall of the spline sleeve mates with the inner peripheral wall of the hub, and the inner peripheral wall of the spline sleeve mates with the crankshaft.

4. The power end of the plunger pump according to claim 2, characterized in that, It also includes two third cylindrical roller bearings, one end of the hub being pivotally connected to the gearbox via one of the third cylindrical roller bearings, and the other end of the hub being pivotally connected to the gearbox via the other third cylindrical roller bearing, with the two third cylindrical roller bearings having a floating clearance in the axial direction of the hub.

5. The power end of the plunger pump according to any one of claims 2-4, characterized in that, It also includes a guide component, the guide component comprising: Guide housing, the guide housing being connected to the reduction gearbox; and A crosshead connecting rod assembly and a tie rod are provided. The crosshead connecting rod assembly is disposed in the guide housing and is connected to the crankshaft. The crosshead connecting rod assembly is also connected to the tie rod to drive the tie rod to reciprocate.

6. The power end of the plunger pump according to claim 5, characterized in that, The first-stage transmission assembly is located below the guide box.

7. A plunger pump, characterized in that, include: The power end is the piston pump power end according to any one of claims 1-6; The crankshaft is connected to the hydraulic end, which includes a plunger.

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