Plunger, Liquid End and Piston Pump

Abstract

A plunger, a hydraulic end, and a plunger pump. The plunger includes a plunger body, a first liquid inlet, and a first valve assembly. The plunger body includes a flow channel located within the plunger body. The first liquid inlet is located on the plunger body and passes through the side wall of the plunger body. The plunger body includes a first end and a second end. The flow channel within the plunger body extends from the first end of the plunger body to the second end of the plunger body. The portion of the flow channel within the plunger body near the first end is closed. The flow channel within the plunger body extends to the second end and forms a first opening at the second end. The first liquid inlet is connected to the flow channel. The first valve assembly is located at the first opening and is configured to allow fluid to flow out of the flow channel at the first opening and prevent fluid from flowing back into the flow channel from the outside. Thus, the plunger can improve the durability of the plunger pump and reduce the cost of the plunger pump.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a plunger, a fluid end, and a plunger pump. Background Art

[0002] In the field of oil and gas extraction, fracturing technology uses high-pressure fracking fluids to create cracks in oil and gas reservoirs. By creating cracks in oil and gas reservoirs, fracturing improves the underground flow environment for oil and gas, thereby increasing oil well production. Therefore, fracturing is widely used in conventional and unconventional oil and gas production, as well as in the development of offshore and onshore oil and gas resources.

[0003] A plunger pump is a device that uses the reciprocating motion of a plunger within a cylinder to increase the pressure of a liquid. Plunger pumps are used in fracturing technology due to their high rated pressure, compact structure, and high efficiency. Summary of the Invention

[0004] The disclosed embodiments provide a plunger, a hydraulic end, and a plunger pump. The plunger allows fluid to flow from a first liquid inlet hole into a flow channel within the plunger body and out through a first valve assembly at a first opening. The valve box of the hydraulic end does not produce an intersection line in the alternating cavity, thereby reducing the risk of cracking and leaking the valve box. Thus, the plunger pump including the plunger and the hydraulic end provides a novel linear plunger pump, which improves the durability and service life of the plunger pump, reduces maintenance costs, and improves maintenance efficiency.

[0005] At least one embodiment of the present disclosure provides a plunger, which includes: a plunger body, including a flow channel located inside the plunger body; a first liquid inlet hole, located on the plunger body and passing through the side wall of the plunger body; and a first valve assembly, the plunger body including a first end and a second end, the flow channel extending from the first end to the second end, the portion of the flow channel close to the first end being closed, the flow channel extending to the second end and forming a first opening at the second end, the first liquid inlet hole being connected to the flow channel, the first valve assembly being located at the first opening, and being configured to allow fluid to flow out of the flow channel at the first opening and to prevent fluid from flowing back into the flow channel from the outside.

[0006] For example, in the plunger provided in an embodiment of the present disclosure, the axis of the plunger body passes through the first opening.

[0007] For example, in the plunger provided in one embodiment of the present disclosure, the first valve assembly includes: a first spring seat sleeve, which is detachably connected to the second end portion and includes a first spring; a first valve seat, which is located at the first opening and includes a first middle hole; and a first valve body, wherein one end of the first valve body is arranged in contact with the first spring seat sleeve, and the other end of the first valve body is arranged in contact with the first valve seat and is located on the inner side of the first middle hole.

[0008] For example, in the plunger provided in an embodiment of the present disclosure, the first valve body includes a first main body and a first guide rod and a second guide rod respectively arranged on both sides of the first main body, the first spring seat sleeve includes a first seat sleeve fixing portion, a first spring fixing portion and a first guide portion located in the first spring fixing portion, the first sleeve fixing portion is detachably connected to the second end portion, and the first spring sleeve is arranged on the outside of the first spring fixing portion; the first spring is arranged in contact with the first main body, and the first guide portion is configured to accommodate at least a portion of the first guide rod to guide the first guide rod.

[0009] For example, in the plunger provided in one embodiment of the present disclosure, the first valve assembly further includes: a first guide seat, which is arranged at the first opening and is located on a side of the first valve seat away from the first spring seat sleeve; and a second guide portion, which is connected to the first guide seat and is configured to accommodate at least a portion of the second guide rod to guide the second guide rod.

[0010] For example, in the plunger provided in an embodiment of the present disclosure, the first valve assembly further includes: a first sealing member located on the outside of the first main body and configured to be in close contact with the first valve seat.

[0011] For example, in the plunger provided in an embodiment of the present disclosure, the plunger body is a rotating body, and the first liquid inlet holes are provided in plurality, and the plurality of first liquid inlet holes are arranged at intervals along the circumference of the plunger body.

[0012] At least one embodiment of the present disclosure also provides a hydraulic end of a plunger pump, which includes: a valve box, including a third end and a fourth end, the valve box including a plunger chamber, located inside the valve box, the plunger chamber including a low-pressure chamber, an alternating chamber and a high-pressure chamber arranged in sequence, the low-pressure chamber including a second opening at the position where the third end is located, the alternating chamber is connected to the low-pressure chamber, the high-pressure chamber is connected to the alternating chamber and is located on the side of the alternating chamber away from the low-pressure chamber, and the high-pressure chamber includes a third opening at the fourth end; the valve box also includes a second liquid inlet and a liquid outlet, the second liquid inlet passes through the side wall of the valve box and is connected to the low-pressure chamber, the liquid outlet passes through the side wall of the valve box and is connected to the high-pressure chamber, and the low-pressure chamber, the alternating chamber and the high-pressure chamber are arranged in sequence in the first direction.

[0013] For example, in the hydraulic end provided in one embodiment of the present disclosure, the average size of the low-pressure chamber in the direction perpendicular to the first direction is larger than the average size of the alternating chamber in the direction perpendicular to the first direction, and the average size of the high-pressure chamber in the direction perpendicular to the first direction is larger than the average size of the alternating chamber in the direction perpendicular to the first direction.

[0014] For example, in the hydraulic end provided in one embodiment of the present disclosure, the low-pressure chamber, the alternating chamber, and the high-pressure chamber are coaxially arranged.

[0015] For example, the hydraulic end provided by an embodiment of the present disclosure also includes: a first pressure cap, fixed on the second opening and including a second middle hole; and a plunger, extending from the second middle hole into the plunger cavity and configured to reciprocate in the first direction, the plunger including a plunger body, including a flow channel located inside the plunger body; a first liquid inlet hole, located on the plunger body and passing through the side wall of the plunger body; and a first valve assembly, the plunger body including a first end and a second end, the flow channel extending from the first end to the second end, the portion of the flow channel close to the first end is closed, the portion of the flow channel close to the second end includes a first opening, the first liquid inlet hole is connected to the flow channel, the first valve assembly is located at the first opening, and is configured to allow fluid to flow out of the flow channel at the second end and prevent fluid from flowing back to the flow channel from the outside, and the first liquid inlet hole is always located in the low-pressure cavity during the movement of the plunger.

[0016] For example, the hydraulic end provided in one embodiment of the present disclosure further includes: a second pressure cap fixed to the third opening; and a second valve assembly located in the high-pressure chamber, wherein the second valve assembly is configured to allow fluid to flow from the alternating chamber into the high-pressure chamber and prevent the fluid from flowing back from the high-pressure chamber to the alternating chamber.

[0017] For example, in the hydraulic end provided in one embodiment of the present disclosure, the second valve assembly includes: a second spring seat sleeve, which is arranged in contact with the second pressure cap and is pressed by the second pressure cap, and includes a second spring; a second valve seat, which is located in the part of the high-pressure chamber close to the alternating chamber and includes a third middle hole; and a second valve body, one end of the second valve body is arranged in contact with the second spring seat sleeve, and the other end of the second valve body is arranged in contact with the second valve seat, and is located on the inner side of the third middle hole.

[0018] For example, in the hydraulic end provided in one embodiment of the present disclosure, the second valve body includes a second main body and a third guide rod and a fourth guide rod respectively arranged on both sides of the second main body, the second spring seat sleeve includes a second seat sleeve fixing portion, a second spring fixing portion and a third guide portion located in the second spring fixing portion, the second sleeve fixing portion is pressed against the third opening by the second pressure cap, and the second spring is sleeved on the outside of the second spring fixing portion; the second spring is arranged in contact with the second main body, and the third guide portion is configured to accommodate at least a portion of the third guide rod to guide the third guide rod.

[0019] For example, in the hydraulic end provided in one embodiment of the present disclosure, the second valve assembly further includes: a second guide seat, located on a side of the second valve seat away from the second spring seat sleeve; and a fourth guide portion, connected to the second guide seat and configured to accommodate at least a portion of the fourth guide rod to guide the fourth guide rod.

[0020] For example, in the hydraulic end provided in an embodiment of the present disclosure, the second valve assembly further includes: a second sealing member located on the outside of the second main body portion and configured to be in close contact with the second valve seat.

[0021] For example, the hydraulic end provided by an embodiment of the present disclosure also includes: a support ring, located within the low-pressure chamber and located on the side of the first pressure cap close to the alternating chamber, the support ring includes a first annular portion and a second annular portion arranged relatively spaced apart, and a plurality of support bars located between the first annular portion and the second annular portion, one end of each support bar is fixed to the first annular portion, and the other end is fixed to the second annular portion, the plurality of support bars are spaced apart from each other to form a plurality of hollow openings, the first annular portion includes a fourth middle hole, the second annular portion includes a fifth middle hole, the plunger is configured to pass through the fourth middle hole and the fifth middle hole, and the first pressure cap is configured to press the support ring.

[0022] For example, in the hydraulic end provided in one embodiment of the present disclosure, the valve box also includes a first grease injection hole, which passes through the side wall of the valve box and is connected to the low-pressure chamber, and the second annular portion includes a second grease injection hole, which extends from the outer wall of the second annular portion to the inner wall of the second annular portion.

[0023] For example, in the hydraulic end provided in one embodiment of the present disclosure, the support ring further includes: a first sealing groove located on the outer side wall of the first annular portion; and a second sealing groove located on the outer side wall of the second annular portion, the first sealing groove and the second sealing groove being configured to accommodate a sealing ring.

[0024] For example, in the hydraulic end provided in an embodiment of the present disclosure, the valve box is provided in plurality, and the plurality of valve boxes are arranged along a second direction perpendicular to the first direction.

[0025] For example, in the hydraulic end provided in one embodiment of the present disclosure, a plurality of valve boxes are integrally formed, or two adjacent valve boxes are connected via a connector.

[0026] At least one embodiment of the present disclosure further provides a plunger pump, comprising: a power end; and any one of the hydraulic ends described above.

[0027] For example, in the plunger pump provided in one embodiment of the present disclosure, one hydraulic end is provided on each of the two sides of the power end in the first direction.

[0028] For example, in the plunger pump provided in an embodiment of the present disclosure, the power end includes a linear motor.

[0029] For example, the plunger pump provided by one embodiment of the present disclosure also includes: an oil receiving pan, located below the hydraulic end, and including a base plate and a shell arranged around the base plate, the base plate and the shell together forming an oil receiving trough, and the oil receiving trough is configured to receive liquid dripping from the hydraulic end; an oil receiving box, located on the side of the base plate away from the hydraulic end, and configured to collect liquid in the oil receiving trough; a scraper, located in the oil receiving trough, and configured to move in the length direction of the base plate; and a drive assembly, configured to drive the scraper to move in the length direction of the base plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, rather than limiting the present disclosure.

[0031] Figure 1 is a cross-sectional view of a plunger pump;

[0032] Figure 2 for Figure 1 Schematic diagram of the hydraulic end of the plunger pump shown;

[0033] Figure 3 for Figure 2 A schematic diagram of the valve box in the fluid end is shown;

[0034] Figure 4 A schematic structural diagram of a plunger provided in one embodiment of the present disclosure;

[0035] Figure 5 A schematic structural diagram of a hydraulic end provided in one embodiment of the present disclosure;

[0036] Figure 6 A schematic structural diagram of a valve box in a hydraulic end provided in one embodiment of the present disclosure;

[0037] Figure 7A A schematic structural diagram of a support ring in a hydraulic end provided in one embodiment of the present disclosure;

[0038] Figure 7B A schematic cross-sectional view of a support ring in a hydraulic end provided in one embodiment of the present disclosure;

[0039] Figure 8 A schematic structural diagram of a hydraulic end provided in one embodiment of the present disclosure;

[0040] Figure 9 A schematic structural diagram of another hydraulic end provided in one embodiment of the present disclosure;

[0041] Figure 10 A schematic structural diagram of a plunger pump provided in one embodiment of the present disclosure;

[0042] Figure 11 A schematic structural diagram of another plunger pump provided in one embodiment of the present disclosure;

[0043] Figure 12 A schematic structural diagram of another plunger pump provided in one embodiment of the present disclosure;

[0044] Figure 13 A schematic structural diagram of another plunger pump provided in one embodiment of the present disclosure; and

[0045] Figure 14 A schematic structural diagram of another plunger pump provided in one embodiment of the present disclosure. DETAILED DESCRIPTION

[0046] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0047] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0048] Typically, a plunger pump includes a power end and a hydraulic end. The power end includes a crank-connecting rod mechanism, and the hydraulic end includes a valve box and a plunger. The power end can convert the mechanical energy of the prime mover into the reciprocating motion of the plunger of the hydraulic end through a transmission mechanism and a crank-connecting rod mechanism (for example, a crankshaft, a connecting rod, and a crosshead). The hydraulic end converts low-pressure liquid into high-pressure liquid through the reciprocating motion of the plunger.

[0049] Figure 1 is a cross-sectional view of a plunger pump; Figure 2 for Figure 1 Schematic diagram of the hydraulic end of the plunger pump shown; Figure 3 for Figure 2 Schematic diagram of the valve box in the hydraulic end shown in FIG. Figure 1 As shown, the plunger pump 40 includes a power end 20 and a fluid end 10. Figure 1 and Figure 2 As shown, the hydraulic end 10 mainly includes a valve box 11, a plunger 12, a first valve assembly 13, a second valve assembly 14 and a pressure cap 15; the first valve assembly 13 is a one-way valve, which allows fluid to enter the valve box 11 from the outside but prevents the fluid in the valve box 11 from flowing out, and the second valve assembly 14 is also a one-way valve, which allows the fluid in the valve box 11 to flow out but prevents the fluid from entering the valve box 11 from the outside; the power end 20 mainly includes a crankshaft 21, a connecting rod 22, a crosshead 23, a pull rod 24 and a clamp 25; the crankshaft 21 is connected to the connecting rod 22, the crosshead 23 is respectively connected to the connecting rod 22 and the pull rod 24, and the pull rod 24 is connected to the plunger 12 through a clamp.

[0050] The operating principle of this plunger pump is as follows: driven by the prime mover, the crankshaft 21 of the power end 20 rotates, thereby driving the connecting rod 22 and crosshead 23 to reciprocate. The crosshead 23 then drives the plunger 12 to reciprocate via the pull rod 24. When the plunger 12 returns (e.g., toward the crankshaft 21), the volume inside the valve housing 11 gradually increases, creating a local negative pressure or vacuum. At this time, the first valve assembly 13 opens and the second valve assembly 14 closes, allowing external fluid to enter the valve housing 11. When the plunger 12 returns to its limit position, the interior of the valve housing 11 is filled with fluid, completing the fluid intake process. Then, as the plunger 12 progresses, the volume inside the valve box 11 gradually decreases, squeezing the fluid inside the valve box 11 and increasing its pressure. At this point, the first valve assembly 13 closes, the second valve assembly 14 opens, and the fluid inside the valve box 11 is discharged through the second valve assembly 14. When the plunger 12 reaches its limit position, the volume inside the valve box 11 is minimized, completing one fluid discharge process. Thus, under the reciprocating motion of the plunger 12, the aforementioned fluid intake and discharge processes alternate continuously, thereby continuously converting low-pressure fluid into high-pressure fluid for output.

[0051] However, if Figure 2 As shown, first valve assembly 13 includes a first spring seat 13A, a first spring 13B, a first valve seat 13D, and a first valve body 13C located between first spring seat 13A and first valve seat 13D. Second valve assembly 14 includes a second spring seat 14A, a second spring 14B, a second valve seat 14D, and a second valve body 14C located between second spring seat 14A and second valve seat 14D. During the opening and closing of first valve assembly 13 and second valve assembly 14, first valve body 13C and second valve body 14C may deflect.

[0052] In addition, if Figure 3 As shown, the interior of the valve box 11 is a cross-intersecting structure, that is, it includes a first cavity 41 and a second cavity 42, and the first cavity 41 and the second cavity 42 are cross-intersecting; the first cavity 41 is used to accommodate the above-mentioned plunger 12, and the second cavity 42 can be divided into a low-pressure area, an alternating area, and a high-pressure area according to the pressure load. However, the intersection line of the first cavity 41 and the second cavity 42 is exactly in the alternating area; according to mechanical analysis, the stress concentration at the intersection line of the first cavity 41 and the second cavity 42 is obvious, and coupled with the effect of the alternating load, fatigue cracks are easily generated at the intersection line, which causes the valve box 11 to crack and leak. Therefore, the plunger pump needs to frequently replace the valve box, which increases costs and reduces efficiency.

[0053] To this end, the present disclosure provides a plunger, a hydraulic end, and a plunger pump. The plunger includes a plunger body, a first liquid inlet, and a first valve assembly. The plunger body includes a flow channel located inside the plunger body. The first liquid inlet is located on the plunger body and passes through the side wall of the plunger body. The plunger body includes a first end and a second end. The flow channel inside the plunger body extends from the first end of the plunger body to the second end of the plunger body. The portion of the flow channel inside the plunger body near the first end is closed. The flow channel inside the plunger body extends to the second end and forms a first opening at the second end. The first liquid inlet is connected to the flow channel. The first valve assembly is located at the first opening and is configured to allow fluid to flow out of the flow channel at the first opening and prevent fluid from flowing back into the flow channel from the outside. Thus, the plunger can allow fluid to flow from the first liquid inlet into the flow channel inside the plunger body and flow out of the first opening through the first valve assembly, thereby being used in a linear plunger pump, thereby improving the durability of the linear plunger pump and reducing the cost of the linear plunger pump.

[0054] Below, the plunger, hydraulic end and plunger pump provided by the embodiments of the present disclosure are described in detail with reference to the accompanying drawings.

[0055] Figure 4 This is a schematic diagram of the structure of a plunger provided in one embodiment of the present disclosure. Figure 4 As shown, the plunger 100 includes a plunger body 110, a first liquid inlet hole 120, and a first valve assembly 130. The plunger body 110 includes a flow channel 112 located within the plunger body 110. The first liquid inlet hole 120 is located on the plunger body 110 and passes through the sidewall of the plunger body 110. The plunger body 110 includes a first end 114 and a second end 116. The flow channel 112 within the plunger body 110 extends from the first end 114 to the second end 116 of the plunger body 110. The portion of the flow channel 112 within the plunger body 110 near the first end 114 is closed. The flow channel 112 within the plunger body 110 extends to the second end 116 and forms a first opening 1124 at the second end 116. In other words, the plunger body 110 has a hollow structure from the second end 116 to the first end 114, namely the flow channel 112.

[0056] like Figure 4 As shown, the first liquid inlet hole 120 passes through the side wall of the plunger body 110 and is connected to the flow channel 112; the first valve assembly 130 is located at the first opening 1124 and is configured to allow fluid to flow out of the flow channel 112 at the first opening 1124 and prevent fluid from flowing back to the flow channel 112 from the outside.

[0057] In the plunger provided in the disclosed embodiment, the first valve assembly is configured to allow fluid to flow out of the flow channel at the first opening and prevent fluid from flowing back into the flow channel from the outside. Therefore, the plunger allows fluid to flow from the first liquid inlet hole into the flow channel within the plunger body and out through the first valve assembly at the first opening. This plunger can be used in a linear plunger pump, thereby improving the durability of the linear plunger pump and reducing the cost of the linear plunger pump.

[0058] In some examples, such as Figure 4 As shown, the axis of the plunger body 110 passes through the first opening 1124 ; that is, the direction from the first end 114 to the second end 116 passes through the first opening 1124 .

[0059] In some examples, such as Figure 4 As shown, the first valve assembly 130 includes a first spring seat 132 , a first valve seat 134 and a first valve body 136 ; the first valve body 136 is located between the first spring seat 132 and the first valve seat 134 .

[0060] like Figure 4 As shown, the first spring seat 132 is detachably connected to the second end portion 116 and includes a first spring 1321. The first valve seat 134 is located in the first opening 1124 and includes a first intermediate hole 191. One end of the first valve body 136 is in contact with the first spring seat 132, while the other end of the first valve body 136 is in contact with the first valve seat 134 and located inside the first intermediate hole 191. When the first valve body 136 moves toward the first valve seat 134 and comes into close contact with the first valve seat 134, the first valve seat 134 and the first valve body 136 can jointly seal the first opening 1124. When the first valve body 136 moves toward the first spring seat 132 and separates from the first valve seat 134, fluid can flow out of the flow passage 112 through the first valve assembly 130.

[0061] For example, the first spring seat sleeve 132 can be detachably connected to the second end portion 116 by a threaded connection, thereby facilitating replacement of the first valve assembly. Of course, the disclosed embodiments include but are not limited to this, and the first spring seat sleeve can also be detachably connected to the second end portion by other connection methods.

[0062] In some examples, such as Figure 4As shown, the first valve body 136 includes a first main body portion 1361 and a first guide rod 1362 and a second guide rod 1363 respectively arranged on both sides of the first main body portion 1361; the first spring seat cover 132 includes a first seat cover fixing portion 1322, a first spring fixing portion 1323 and a first guide portion 1324 located in the first spring fixing portion 1323; the first seat fixing portion 1322 is detachably connected to the second end portion 116, and the first spring 1321 is sleeved on the outside of the first spring fixing portion 1323.

[0063] like Figure 4 As shown, first spring 1321 is disposed in contact with first main body 1361; under the elastic force of first spring 1321, first valve body 136 is in close contact with first valve seat 135; first guide portion 1324 is configured to accommodate at least a portion of first guide rod 1362, thereby guiding first guide rod 1362. Thus, during operation of the first valve assembly, the first guide portion guides the first guide rod, allowing the first valve body to move stably in the direction in which the first guide rod extends, thereby preventing the first valve assembly from deflecting during opening and closing.

[0064] In some examples, such as Figure 4 As shown, the first valve assembly 130 further includes a first guide seat 138 and a second guide portion 139. The first guide seat 138 is disposed within the first opening 1124 and is located on a side of the first valve seat 134 away from the first spring seat sleeve 132. The second guide portion 139 is connected to the first guide seat 139 and is configured to accommodate at least a portion of the second guide rod 1363 to guide the second guide rod 1363. Thus, during operation of the first valve assembly, since the first guide portion guides the first guide rod and the second guide portion guides the second guide rod, the first valve body can stably move in the extending directions of the first and second guide rods, thereby further preventing the first valve assembly from deflecting during opening and closing.

[0065] For example, the first guide rod 1362 and the second guide rod 1363 are coaxially arranged, that is, the axis of the first guide rod 1362 and the axis of the second guide rod 1363 overlap.

[0066] In some examples, such as Figure 4 As shown, the first valve assembly 130 further includes a first sealing member 133, which is located outside the first main body portion 1361 and is configured to be in close contact with the first valve seat 134, thereby improving the sealing performance between the first valve seat and the first valve body.

[0067] In some examples, such as Figure 4As shown, the plunger body 110 may be a rotating body, and a plurality of first liquid inlet holes 120 are provided; the plurality of first liquid inlet holes 120 are arranged at intervals along the circumference of the plunger body 110, thereby improving the liquid intake efficiency.

[0068] In some examples, such as Figure 4 As shown, the first spring seat cover 132 includes a plurality of hollow structures to facilitate the flow of fluid from the first spring seat cover 132 .

[0069] In some examples, such as Figure 4 As shown, the contact surface between the first opening 1124 and the first valve seat 135 can be a conical surface, and match the conical surface of the first valve seat 135, so that the first valve seat can be fixed and removed more conveniently.

[0070] An embodiment of the present disclosure also provides a hydraulic end of a plunger pump. Figure 5 A schematic structural diagram of a hydraulic end provided in one embodiment of the present disclosure; Figure 6 A schematic structural diagram of a valve box in a hydraulic end provided in one embodiment of the present disclosure.

[0071] like Figure 5 and Figure 6 As shown, the hydraulic end 200 includes a valve housing 210; the valve housing 210 includes a third end 213 and a fourth end 214; the valve housing 210 includes a plunger chamber 220 located within the valve housing 210; the plunger chamber 220 includes a low-pressure chamber 221, an alternating chamber 222, and a high-pressure chamber 223, which are arranged in sequence; the low-pressure chamber 221 includes a second opening 2214 at the location of the third end 213; the alternating chamber 222 is connected to the low-pressure chamber 221; the high-pressure chamber 223 is connected to the alternating chamber 222 and is located on the side of the alternating chamber 222 away from the low-pressure chamber 221; and the high-pressure chamber 223 includes a third opening 2234 at the fourth end 214. It can be seen that the plunger chamber 220 extends through the valve housing 210 and has a second opening 2214 at the second end 212 and a third opening 2234 at the third end 214.

[0072] like Figure 5 and Figure 6 As shown, the valve box 210 also includes a second liquid inlet hole 216 and a liquid outlet hole 218. The second liquid inlet hole 212 passes through the side wall of the valve box 210 and is connected to the low-pressure chamber 221. The liquid outlet hole 218 passes through the side wall of the valve box 210 and is connected to the high-pressure chamber 223. The low-pressure chamber 221, the alternating chamber 222 and the high-pressure chamber 223 are arranged in sequence in the first direction X.

[0073] In the hydraulic end provided by the embodiment of the present disclosure, when a plunger is provided in the plunger chamber, the fluid can enter the low-pressure chamber and the alternating chamber from the second liquid inlet hole, and then be pressurized under the reciprocating motion of the plunger and flow out from the liquid outlet hole. Since the low-pressure chamber, the alternating chamber, and the high-pressure chamber are arranged in sequence in the first direction X and are simultaneously used to accommodate the plunger, the valve box does not produce an intersection line in the alternating chamber, thereby reducing the risk of cracking and leaking the valve box, thereby improving the durability and service life of the valve box. As a result, the hydraulic end can improve the durability and service life of the plunger pump, reduce the maintenance cost of the plunger pump, and improve the maintenance efficiency of the plunger pump.

[0074] In some examples, such as Figure 6 As shown, the average size of the low-pressure chamber 221 in the direction perpendicular to the first direction X is larger than the average size of the alternating chamber 222 in the direction perpendicular to the first direction X, and the average size of the high-pressure chamber 223 in the direction perpendicular to the first direction X is larger than the average size of the alternating chamber 222 in the direction perpendicular to the first direction X. In other words, the average radial size of the low-pressure chamber 221 is larger than the average radial size of the alternating chamber 222, and the average radial size of the high-pressure chamber 223 is larger than the average radial size of the alternating chamber 222.

[0075] In some examples, such as Figure 6 As shown, the low-pressure chamber 221, the alternating chamber 222 and the high-pressure chamber 223 are coaxially arranged. Thus, the plunger chamber in the valve box is easy to manufacture and helps to avoid stress concentration.

[0076] In some examples, such as Figure 5 As shown, the hydraulic end 200 further includes a first pressure cap 241 and a plunger 100; the first pressure cap 241 is fixed to the second opening 2214 and includes a second middle hole 192; the plunger 100 extends into the plunger cavity 220 from the second middle hole 192 and is configured to reciprocate in the first direction X.

[0077] For example, Figure 5 As shown, a sealing groove 1920 can be provided inside the second middle hole 192 of the first pressure cap 241 for placing a sealing ring, thereby achieving a sealing effect. It should be noted that one or more sealing grooves can be provided in the first direction X.

[0078] like Figure 5As shown, the plunger 100 can be the plunger 100 provided in any of the above examples. For example, the plunger 100 includes a plunger body 110, a first liquid inlet hole 120, and a first valve assembly 130. The plunger body 110 includes a flow channel 112 located within the plunger body 110. The first liquid inlet hole 120 is located on the plunger body 110 and passes through the sidewall of the plunger body 110. The plunger body 110 includes a first end 114 and a second end 116. The flow channel 112 within the plunger body 110 extends from the first end 114 to the second end 116 of the plunger body 110. The portion of the flow channel 112 within the plunger body 110 near the first end 114 is closed. The flow channel 112 within the plunger body 110 extends to the second end 116, forming a first opening 1124 at the second end 116. The first liquid inlet hole 120 passes through the side wall of the plunger body 110 and is connected to the flow channel 112. The first valve assembly 130 is located at the first opening 1124 and is configured to allow the fluid to flow out of the flow channel 112 at the first opening 1124 and prevent the fluid from flowing back into the flow channel 112 from the outside. It should be noted that in order to clearly illustrate the reference numerals of other components of the hydraulic end, Figure 5 The reference numerals of the various components in the plunger are omitted. The reference numerals of the various components in the plunger can be found in Figure 4 .

[0079] In some examples, such as Figure 5 As shown, the hydraulic end 200 further includes a second pressure cap 242 and a second valve assembly 250; the second pressure cap 242 is fixed to the third opening 2234, and the second valve assembly 250 is located in the high-pressure chamber 223. The second valve assembly 250 is configured to allow fluid to flow from the alternating chamber 222 into the high-pressure chamber 223 and prevent the fluid from flowing back from the high-pressure chamber 223 to the alternating chamber 222.

[0080] In the hydraulic end provided in this example, when the plunger makes a return stroke (moving from the high-pressure chamber to the low-pressure chamber), the internal volume of the valve box gradually increases, forming a local vacuum or negative pressure. At this time, the first valve assembly opens and the second valve assembly closes, and fluid can enter the flow channel inside the plunger through the second liquid inlet and the first liquid inlet, and then enter the alternating chamber and the high-pressure chamber from the first valve assembly. When the plunger returns to the limit position, the valve box is filled with fluid, completing a fluid intake process. When the plunger makes a forward motion (moving from the low-pressure chamber to the high-pressure chamber), the internal volume of the valve box gradually decreases, and the fluid is squeezed by the plunger, increasing its pressure. At this time, the second valve assembly opens and the first valve assembly closes, and the fluid flows out of the outlet hole connected to the high-pressure chamber. When the plunger reaches the limit position, the internal volume of the valve box is minimized, completing a fluid discharge process. Because the plunger can continuously reciprocate, the above-mentioned fluid intake and fluid discharge processes are continuously alternated, so that high-pressure fluid can be continuously discharged from the outlet hole.

[0081] In some examples, such as Figure 6 As shown, the radial dimensions of the low-pressure chamber 221 at different positions in the first direction X are substantially the same. The alternating chamber 222 can be divided into a first sub-alternating chamber 222A, a second sub-alternating chamber 222B, and a third sub-alternating chamber 222C according to different radial dimensions; the first sub-alternating chamber 222A can be used to accommodate the plunger 100 and the high-pressure sealing assembly 260, and the high-pressure sealing assembly 260 is respectively arranged in contact with the plunger 100 and the side wall of the first sub-alternating chamber 222A; the radial dimension of the second sub-alternating chamber 222B is smaller than the radial dimension of the first sub-alternating chamber 222A, and larger than the radial dimension of the plunger 100, thereby accommodating the plunger 100; the radial dimension of the third sub-alternating chamber 222C is larger than the radial dimension of the first sub-alternating chamber 222A, thereby increasing a certain amount of accommodation space for accommodating fluid.

[0082] In some examples, such as Figure 5 As shown, the second valve assembly 250 includes a second spring seat 252, a second valve seat 254, and a second valve body 256. The second valve body 256 is disposed between the second spring seat 252 and the second valve seat 254. The second spring seat 252 is disposed in contact with and compressed by the second pressure cap 242 and includes a second spring 2521. The second valve seat 254 is located in the portion of the high-pressure chamber 223 near the alternating chamber 222 and includes a third intermediate hole 193. One end of the second valve body 256 is disposed in contact with the second spring seat 252, while the other end of the second valve body 256 is disposed in contact with the second valve seat 254 and is located inside the third intermediate hole 193. Thus, when the second valve body 256 moves toward the second valve seat 254 and is in close contact with the second valve seat 254, the second valve seat 254 and the second valve body 256 can jointly seal the part of the high-pressure chamber close to the alternating chamber; when the second valve body 256 moves toward the second spring seat sleeve 252 and separates from the second valve seat 254, the fluid can flow from the alternating chamber 222 into the high-pressure chamber 223 through the second valve assembly 130.

[0083] In some examples, such as Figure 5As shown, the second valve body 256 includes a second main body 2561 and a third guide rod 2562 and a fourth guide rod 2563 disposed on either side of the second main body 2561. The second spring seat sleeve 252 includes a second seat sleeve fixing portion 2522, a second spring fixing portion 2523, and a third guide portion 2524 located within the second spring fixing portion 2523. The second seat sleeve fixing portion 2522 is pressed against the third opening 2234 by the second pressing cap 242, and the second spring 2521 is sleeved outside the second spring fixing portion 2523. The second spring 2521 is disposed in contact with the second main body 2561, and the third guide portion 2524 is configured to accommodate at least a portion of the third guide rod 2562 to guide the third guide rod 2562. Thus, during operation of the second valve assembly, the third guide portion guides the third guide rod, allowing the second valve body to stably move in the direction in which the third guide rod extends, thereby preventing the second valve assembly from deflecting during opening and closing.

[0084] In some examples, such as Figure 5 As shown, the second valve assembly 250 further includes a second guide seat 258 and a fourth guide portion 259. The second guide seat 258 is located on a side of the second valve seat 254 away from the second spring seat sleeve 252. The fourth guide portion 259 is connected to the second guide seat 258 and is configured to accommodate at least a portion of the fourth guide rod 2563 to guide the fourth guide rod 2563. Therefore, during operation of the second valve assembly, since the third guide portion guides the third guide rod and the fourth guide portion guides the fourth guide rod, the second valve can stably move in the extending directions of the third and fourth guide rods, thereby further preventing the second valve assembly from deflecting during opening and closing.

[0085] In some examples, such as Figure 5 As shown, the second valve assembly 250 further includes a second sealing member 253, which is located outside the second main body portion 2561 and is configured to be in close contact with the second valve seat 254, thereby improving the sealing performance between the second valve seat and the second valve body.

[0086] Figure 7A A schematic structural diagram of a support ring in a hydraulic end provided in one embodiment of the present disclosure; Figure 7B This is a cross-sectional diagram of a support ring in a hydraulic end provided in one embodiment of the present disclosure. Figure 5 、 Figure 7A and Figure 7B As shown, the hydraulic end 200 further includes a support ring 270 . The support ring 270 is located in the low-pressure chamber 221 and on a side of the first pressure cap 241 close to the alternating chamber 222 .

[0087] like Figure 7A and Figure 7BAs shown, the support ring 270 includes a first annular portion 271 and a second annular portion 272 spaced apart from each other, and a plurality of support bars 273 located between the first annular portion 271 and the second annular portion 272. Each support bar 273 is fixed to the first annular portion 271 at one end and to the second annular portion 272 at the other end. The plurality of support bars 273 are spaced apart to form a plurality of hollow openings 274. The first annular portion 271 includes a fourth middle hole 194, and the second annular portion 272 includes a fifth middle hole 195. The plunger 100 is configured to pass through the fourth and fifth middle holes 194, 195. The first pressure cap 241 is configured to press the support ring 270. As a result, due to the larger space in the low-pressure chamber, the support ring 270 can support and restrain the plunger 100, thereby improving the stability of the hydraulic end.

[0088] In some examples, such as Figure 5 、 Figure 7A and Figure 7B As shown, the valve housing 210 further includes a first grease injection hole 230, which passes through the side wall of the valve housing 210 and communicates with the low-pressure chamber 221. The second annular portion 272 includes a second grease injection hole 2721, which extends from the outer wall of the second annular portion 272 to the inner wall of the second annular portion 272. Thus, grease can be injected into the interior of the valve housing 210 through the first grease injection hole 230, and then grease can be provided to the second annular portion and the plunger through the second grease injection hole.

[0089] In some examples, such as Figure 5 、 Figure 7A and Figure 7B As shown, support ring 270 also includes a first sealing groove 275 and a second sealing groove 276. First sealing groove 275 is located on the outer wall of first annular portion 271, while second sealing groove 276 is located on the outer wall of second annular portion 272. First sealing groove 275 and second sealing groove 276 are configured to accommodate sealing rings. Thus, the support ring can seal the portion of the low-pressure chamber located between the first and second sealing grooves.

[0090] In some examples, such as Figure 5 As shown, the maximum length of the reciprocating motion of the plunger 100 does not exceed the length of the support ring 270 ; in addition, the maximum position of the first liquid inlet hole 120 of the plunger 100 is always located between the first annular portion 271 and the second annular portion 272 .

[0091] In some examples, such as Figure 5As shown, the first support ring 271 can be fitted with the first pressure cap 241, and the first pressure cap 241 can apply a force along the first direction X to the first support ring 271; the second support ring 272 can be fitted with the high-pressure sealing assembly 260, so that the force applied by the first pressure cap 241 is transmitted to the high-pressure sealing assembly 260, thereby compacting the high-pressure sealing assembly 260. At this time, the grease entering from the first grease injection hole can also lubricate the high-pressure sealing assembly 260.

[0092] Figure 8 A schematic structural diagram of a hydraulic end provided in one embodiment of the present disclosure; Figure 9 This is a schematic diagram of the structure of another hydraulic end provided in one embodiment of the present disclosure. Figure 8 and Figure 9 As shown, a plurality of valve boxes 210 are provided, and the plurality of valve boxes 210 are arranged along a second direction perpendicular to the first direction X, thereby increasing the displacement of the hydraulic end.

[0093] In some examples, such as Figure 8 As shown, multiple valve boxes 210 are integrally formed; that is, multiple valve boxes 210 are an integrated structure. As a result, the hydraulic end has high strength and strong load-bearing capacity, which can meet the needs of high-power continuous operation.

[0094] In some examples, such as Figure 9 As shown, the multiple valve boxes 210 are independent components, and two adjacent valve boxes 210 are connected by a connector 280. Therefore, the hydraulic end is light in weight, easy to install and maintain, and can also be applied to a plunger pump with a linear motor as the power end.

[0095] For example, two adjacent valve boxes 210 are connected via a connecting flange 280. Of course, the embodiments of the present disclosure include but are not limited to this, and two adjacent valve boxes may also be connected via other types of connectors.

[0096] Figure 10 A schematic structural diagram of a plunger pump provided in one embodiment of the present disclosure; Figure 11 This is a schematic diagram of the structure of another plunger pump provided in one embodiment of the present disclosure. Figure 10 and Figure 11 As shown, the plunger pump 400 includes a power end 300 and a fluid end 200 as provided in any of the above examples. Because the valve box in the fluid end does not produce an intersection line in the alternating chamber, the risk of cracking and leaking the valve box is reduced, thereby improving the durability and service life of the valve box. Therefore, the plunger pump has high durability and service life. Furthermore, since the frequency of valve box replacement is reduced, the plunger pump also has low cost and high efficiency.

[0097] In some examples, such as Figure 10As shown, the plunger pump 400 further includes a clamp 310, which connects the power end 300 with the plunger 100 of the fluid end 200, thereby transmitting the kinetic energy of the power end 300 to the plunger 100 of the fluid end 200 and causing the plunger 100 to reciprocate in the first direction X.

[0098] In some examples, such as Figure 11 As shown, the power end 300 can be provided with a fluid end 100 on both sides in the first direction X, thereby converting the kinetic energy of the plunger in the fluid end 100 on one side of the power end 300 during the return stroke into the kinetic energy of the plunger in the fluid end on the other side during the forward stroke, thereby improving the working efficiency and increasing the displacement. Of course, the embodiments of the present disclosure include but are not limited to this, such as Figure 10 As shown, the power end 300 may also be provided with the hydraulic end 200 only on one side in the first direction X.

[0099] In some examples, the power end includes a linear motor, for example, with a stroke greater than or equal to 40 inches.

[0100] Figure 12 This is a schematic diagram of the structure of another plunger pump provided in one embodiment of the present disclosure. Figure 12 As shown, the fluid end 200 may also adopt a conventional power end 300, that is, a power end including a crankshaft connecting rod mechanism.

[0101] Figure 13 A schematic diagram of another plunger pump provided in one embodiment of the present disclosure; Figure 14 Schematic diagram of another plunger pump provided in one embodiment of the present disclosure. Figure 13 and Figure 14 As shown, the plunger pump 400 also includes an oil receiving pan 410, an oil receiving box 420, a scraper 430 and a drive assembly 440; the oil receiving pan 410 is located below the hydraulic end 200, and includes a base plate 412 and a shell 414 arranged around the base plate 412, the base plate 412 and the shell 414 together form an oil receiving groove 450, and the oil receiving groove 450 is configured to receive liquid dripping from the hydraulic end 200; the oil receiving box 420 is located on the side of the base plate 412 away from the hydraulic end 200, and is configured to collect liquid in the oil receiving groove 450; the scraper 430 is located in the oil receiving groove 450, and is configured to move in the length direction of the base plate 412; the drive assembly 440 is configured to drive the scraper 430 to move in the length direction of the base plate 412. Thus, the liquid dripping from the hydraulic end 200 can be received by the oil receiving groove 450, and then the liquid received by the oil receiving groove 450 can be scraped into the oil receiving box 420 by the driving assembly 440. It should be noted that the liquid dripping from the hydraulic end includes grease and oil.

[0102] For example, Figure 13As shown, the driving assembly 440 includes a motor 442 and a steel wire rope 444 . The steel wire rope 444 is connected to the scraper 430 . The motor 442 can drive the steel wire rope 444 to move, thereby driving the scraper 430 to move.

[0103] For example, Figure 13 As shown, the plunger pump 400 may also include an oil level sensor 461 and a position sensor 462; the oil level sensor 461 may be used to sense the amount of liquid dripping from the hydraulic end 200 received by the oil receiving tank 450, and the position sensor 462 may be used to sense the position of the scraper 430. Thus, when the oil level sensor 461 detects that the grease, oil, etc. in the oil receiving tank 450 has reached a certain amount, the oil level sensor 461 may feed back a signal to the control system, and the motor 442 may rotate forward ( Figure 13 The scraper 430 moves to the position sensor 462, which feeds back information to the control system, and the motor 442 reverses ( Figure 13 counterclockwise direction in the middle), driving the wire rope 442 to move in the reverse direction.

[0104] In some examples, such as Figure 14 As shown, the driving device 440 may also include a wire rope 444 and a pull ring 446 to achieve manual operation.

[0105] There are a few points to note:

[0106] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to conventional designs.

[0107] (2) Unless there is any conflict, the features of the same embodiment and different embodiments of the present disclosure may be combined with each other.

[0108] The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A hydraulic end of a plunger pump, comprising: a valve box, comprising a third end portion and a fourth end portion, The valve box includes a plunger cavity located inside the valve box, the plunger cavity includes a low-pressure cavity, an alternating cavity, and a high-pressure cavity arranged in sequence, the low-pressure cavity includes a second opening at the location of the third end, the alternating cavity is connected to the low-pressure cavity, the high-pressure cavity is connected to the alternating cavity and is located on a side of the alternating cavity away from the low-pressure cavity, and the high-pressure cavity includes a third opening at the fourth end; The valve box further includes a second liquid inlet and a liquid outlet. The second liquid inlet passes through the side wall of the valve box and is connected to the low-pressure chamber. The liquid outlet passes through the side wall of the valve box and is connected to the high-pressure chamber. The low-pressure chamber, the alternating chamber, and the high-pressure chamber are sequentially arranged in the first direction. The hydraulic end further comprises: a first pressing cap fixed to the second opening and comprising a second middle hole; and a plunger extending from the second middle hole into the plunger cavity and configured to reciprocate in the first direction, Wherein, the plunger includes a plunger body, including a flow channel located inside the plunger body; a first liquid inlet hole; and a first valve assembly, the plunger body includes a first end and a second end, the flow channel extends from the first end to the second end, the portion of the flow channel close to the first end is closed, the portion of the flow channel close to the second end includes a first opening, the first liquid inlet hole is connected to the flow channel, the first valve assembly is located at the first opening, and is configured to allow fluid to flow out of the flow channel at the second end and prevent fluid from flowing back into the flow channel from the outside, the first liquid inlet hole is located on the plunger body and passes through the side wall of the plunger body, The first liquid inlet hole is always located in the low-pressure cavity during the movement of the plunger, and a sealing groove is provided on the inner side of the second middle hole of the first pressure cap, which is configured to accommodate a sealing ring.

2. The liquid end according to claim 1, wherein: The average size of the low-pressure chamber in a direction perpendicular to the first direction is larger than the average size of the alternating chamber in a direction perpendicular to the first direction, and the average size of the high-pressure chamber in a direction perpendicular to the first direction is larger than the average size of the alternating chamber in a direction perpendicular to the first direction.

3. The liquid end according to claim 1, wherein: The low-pressure chamber, the alternating chamber, and the high-pressure chamber are coaxially arranged.

4. The liquid end according to claim 1, further comprising: a second pressing cap fixed to the third opening; as well as The second valve assembly is located in the high pressure chamber, The second valve assembly is configured to allow fluid to flow from the alternating chamber into the high-pressure chamber and prevent fluid from flowing back from the high-pressure chamber to the alternating chamber.

5. The liquid end according to claim 4, wherein: The second valve assembly includes: a second spring seat sleeve, arranged in contact with and pressed by the second pressing cap, and comprising a second spring; A second valve seat is located at a portion of the high-pressure chamber close to the alternating chamber and includes a third middle hole; and The second mortal body, One end of the second valve body is in contact with the second spring seat sleeve, and the other end of the second valve body is in contact with the second valve seat and is located on the inner side of the third middle hole.

6. The liquid end according to claim 5, wherein: The second valve body includes a second main body and a third guide rod and a fourth guide rod respectively arranged on both sides of the second main body. The second spring seat cover includes a second seat cover fixing portion, a second spring fixing portion and a third guide portion located in the second spring fixing portion, the second seat cover fixing portion is pressed against the third opening by the second pressing cap, and the second spring cover is arranged outside the second spring fixing portion; The second spring is disposed in contact with the second main body portion, and the third guide portion is configured to accommodate at least a portion of the third guide rod to guide the third guide rod.

7. The liquid end according to claim 6, wherein: The second valve assembly further includes: a second guide seat, located on a side of the second valve seat away from the second spring seat sleeve; and The fourth guide portion is connected to the second guide seat and is configured to accommodate at least a portion of the fourth guide rod to guide the fourth guide rod.

8. The liquid end according to claim 6, wherein: The second valve assembly further includes: The second sealing member is located on the outer side of the second main body and is configured to be in close contact with the second valve seat.

9. The liquid end according to any one of claims 1 to 3, further comprising: A support ring is located in the low-pressure chamber and on a side of the first pressure cap close to the alternating chamber. The support ring includes a first annular portion and a second annular portion that are relatively spaced apart, and a plurality of support bars located between the first annular portion and the second annular portion, one end of each support bar is fixed to the first annular portion, and the other end is fixed to the second annular portion, and the plurality of support bars are spaced apart from each other to form a plurality of hollow openings. The first annular portion includes a fourth middle hole, the second annular portion includes a fifth middle hole, the plunger is configured to pass through the fourth middle hole and the fifth middle hole, and the first pressing cap is configured to press the support ring.

10. The liquid end according to claim 9, wherein: The valve box also includes a first grease injection hole, which passes through the side wall of the valve box and is connected to the low-pressure chamber. The second annular part includes a second grease injection hole, which extends from the outer wall of the second annular part to the inner wall of the second annular part.

11. The liquid end according to claim 9, wherein: The support ring further comprises: a first sealing groove located on an outer side wall of the first annular portion; and The second sealing groove is located on the outer side wall of the second annular portion. Wherein, the first sealing groove and the second sealing groove are configured to accommodate a sealing ring.

12. The liquid end according to any one of claims 1 to 3, wherein: The valve boxes are provided in plurality, and the plurality of valve boxes are arranged along a second direction perpendicular to the first direction.

13. The liquid end according to claim 12, wherein: The plurality of valve boxes are integrally formed, or two adjacent valve boxes are connected via a connector.

14. A plunger pump comprising: Power end; as well as The fluid end according to any one of claims 1 to 13.

15. The plunger pump according to claim 14, wherein One hydraulic end is respectively provided on both sides of the power end in the first direction.

16. The plunger pump according to claim 14, wherein The power end includes a linear motor.

17. The plunger pump according to any one of claims 14 to 16, further comprising: an oil receiving pan located below the hydraulic end and comprising a bottom plate and a shell disposed around the bottom plate, wherein the bottom plate and the shell together form an oil receiving groove configured to receive liquid dripping from the hydraulic end; an oil collecting box, located on a side of the bottom plate away from the hydraulic end and configured to collect liquid in the oil collecting tank; a scraper located in the oil receiving groove and configured to move in the length direction of the bottom plate; as well as The driving assembly is configured to drive the scraper to move in the length direction of the base plate.

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