Plunger pump, power end housing of plunger pump and machining process thereof

Abstract

This application belongs to the field of pump housing manufacturing technology, specifically relating to a plunger pump, the power end housing of the plunger pump, and its processing technology. The power end housing of the plunger pump includes a crankcase and a crosshead housing, the crankcase being connected to the crosshead housing. The crosshead housing has a front end face and a rear end face. The crosshead housing has multiple crosshead guide holes extending through it along a first direction. Above and / or below each crosshead guide hole, a fluid channel is correspondingly provided. The front end of each crosshead guide hole is connected to the front end of its corresponding fluid channel, and the rear end of each crosshead guide hole is connected to the rear end of its corresponding fluid channel. The first direction is the direction extending from the front end face to the rear end face. This application solves the problem in related technologies where external circulation equipment is required to achieve self-circulation of lubricating oil.

Description

[0001] This application claims priority to international patent application filed on December 19, 2022, with application number PCT / CN2022 / 140075, entitled "Plunger Pump, Power End Housing of Plunger Pump and Processing Technology Thereof", the contents of which are incorporated herein by reference. Technical Field

[0002] This application belongs to the field of pump housing manufacturing technology, specifically relating to a plunger pump, the power end housing of the plunger pump, and its processing technology. Background Technology

[0003] In recent years, due to the increasing volume of ultra-deep or ultra-large-scale fracturing operations, the demand for large-scale complete sets of fracturing equipment has become increasingly urgent. The fracturing pump truck is the core equipment of the fracturing unit, and the plunger pump, as a key component of the fracturing pump truck, has a decisive influence on the operational capacity of the fracturing pump truck due to the performance of its power end casing.

[0004] The power end housing of the plunger pump includes a crankcase and a crosshead housing. One end of the crosshead housing is connected to the crankcase, and the other end is connected to the hydraulic end pump head body via a tie rod. It mainly uses the cylindrical hole in the inner cavity as a slide for the reciprocating motion of the crosshead, so as to realize the conversion of the rotational motion of the crankshaft into the smooth reciprocating motion of the crosshead and the plunger.

[0005] In related technologies, the crosshead head is equipped with an inner cylindrical bore, an oil drain hole, and an oil filler hole, with the oil drain hole and oil filler hole respectively connected to the inner cylindrical bore. When using the crosshead head, lubricating oil can be continuously injected through the oil filler hole using an external circulation device, and the lubricating oil can be recovered through the oil drain hole. Therefore, it is evident that this technology requires an external circulation device to achieve self-circulation of the lubricating oil. Summary of the Invention

[0006] The purpose of this application is to provide a plunger pump, a power end housing of the plunger pump, and its processing technology, which can solve the problem that related technologies require external circulation equipment to achieve self-circulation of lubricating oil.

[0007] To solve the above-mentioned technical problems, this application is implemented as follows:

[0008] In a first aspect, embodiments of this application provide a power end housing for a plunger pump, including a crankcase and a crosshead housing, the crankcase being connected to the crosshead housing, the crosshead housing having a front end face and a rear end face, and the crosshead housing having a plurality of crosshead guide holes penetrating the crosshead housing along a first direction.

[0009] Fluid channels are provided above and / or below each crosshead guide hole.

[0010] The front end of each crosshead guide hole is connected to the front end of its corresponding fluid channel, and the rear end of each crosshead guide hole is connected to the rear end of its corresponding fluid channel.

[0011] The first direction is the direction that extends from the front end to the back end.

[0012] Secondly, embodiments of this application provide a plunger pump, including the power end housing as described above.

[0013] Thirdly, embodiments of this application provide a processing technology for the power end housing of a plunger pump, applied to the aforementioned power end housing, including:

[0014] Cast multiple shell units;

[0015] Multiple housing units are welded together in sequence to form a crankcase;

[0016] Cast crosshead box;

[0017] Connect the crankcase and the crosshead case.

[0018] In this embodiment, the crosshead housing includes a crosshead guide hole and a fluid channel. The front end of the crosshead guide hole is connected to the front end of the fluid channel, and the rear end of the crosshead guide hole is connected to the rear end of the fluid channel. During the process of the crosshead sliding in the crosshead guide hole in a direction opposite to the first direction, the pressure at the front end of the crosshead guide hole gradually increases. Oil and gas in the crosshead guide hole can enter the front end of the fluid channel from the front end of the crosshead guide hole. Simultaneously, oil and gas in the crankcase can enter the crosshead guide hole. As the crosshead continues to slide, the pressure at the front end of the crosshead guide hole continues to increase. At this time, oil and gas can enter the fluid channel from the front end of the crosshead guide hole. The rear end of the channel enters the rear end of the crosshead guide hole. A portion of the oil and gas can then flow back into the crankcase through the rear end of the crosshead guide hole, while another portion flows towards the front end. As the crosshead slides along the first direction within the crosshead guide hole, the pressure at the rear end of the guide hole gradually increases. Oil and gas within the guide hole can then enter the rear end of the fluid channel and the crankcase from the rear end of the guide hole. As the crosshead continues to slide, the pressure at the rear end of the guide hole continues to increase, allowing oil and gas to enter the front end of the guide hole from the front end of the fluid channel. Therefore, this embodiment achieves self-circulation of oil and gas without the need for external circulation equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the crosshead box disclosed in the embodiments of this application;

[0020] Figure 2 This is a cross-sectional view of the crosshead box disclosed in the embodiments of this application;

[0021] Figure 3 This is a schematic diagram of the internal structure of the crosshead box disclosed in the embodiments of this application;

[0022] Figure 4 This is an exploded view of the crankcase disclosed in an embodiment of this application;

[0023] Figure 5 This is an assembly diagram of the crankcase disclosed in an embodiment of this application;

[0024] Figure 6 This is an exploded view of the housing unit disclosed in the embodiments of this application;

[0025] Figure 7 This is a schematic diagram of the power end housing structure disclosed in an embodiment of this application;

[0026] Figure 8 This is a flowchart illustrating the manufacturing process of the power end housing disclosed in an embodiment of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100-Crankcase, 110-Housing unit, 111-Front end plate, 112-Top plate, 113-Support member, 114-Rear end plate, 115-Outrigger, 116-Upright plate, 200-Crosshead box, 210-Crosshead guide hole, 220-Fluid channel, 230-First connecting groove, 231-First bottom wall, 232-First side wall, 233-Second side wall, 240-Connecting part, 241-Unloading hole, 250-First connecting hole, 300-Reinforcing beam, 400-Connecting protrusion, 410-Second connecting hole. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] The following description, in conjunction with the accompanying drawings, details the plunger pump, the power end housing of the plunger pump, and their processing technology provided in this application through specific embodiments and application scenarios.

[0032] like Figures 1 to 7 As shown in the figure, this application discloses a power end housing of a plunger pump, including a crankcase 100 and a crosshead housing 200. The crankcase 100 is connected to the crosshead housing 200. The crosshead housing 200 has a front end face and a rear end face. The crosshead housing 200 is provided with a plurality of crosshead guide holes 210 extending through the crosshead housing 200 along a first direction. Optionally, the crankcase 100 may be connected to the front end face of the crosshead housing 200, or the crankcase 100 may be connected to the rear end face of the crosshead housing 200. For ease of description, in the following text, this embodiment will take the example of the crankcase 100 being connected to the rear end face of the crosshead housing 200 and the hydraulic pump head body being connected to the front end face of the crosshead housing 200.

[0033] Above and / or below each crosshead guide hole 210, fluid channels 220 are respectively provided. The front end of each crosshead guide hole 210 is connected to the front end of its corresponding fluid channel 220, and the rear end of each crosshead guide hole 210 is connected to the rear end of its corresponding fluid channel 220. The first direction is the direction extending from the front end to the rear end. In this embodiment, the crosshead housing 200 includes a crosshead guide hole 210 and a fluid channel 220. The front end of the crosshead guide hole 210 is connected to the front end of the fluid channel 220, and the rear end of the crosshead guide hole 210 is connected to the rear end of the fluid channel 220. During the process of the crosshead sliding in the crosshead guide hole 210 in a direction opposite to the first direction, the pressure at the front end of the crosshead guide hole 210 gradually increases. Oil and gas in the crosshead guide hole 210 can enter the front end of the fluid channel 220 from the front end of the crosshead guide hole 210. Simultaneously, oil and gas in the crankcase 100 can enter the crosshead guide hole 210. As the crosshead continues to slide, the pressure at the front end of the crosshead guide hole 210 continues to increase. At this time, oil and gas can enter the fluid channel 220 from the front end of the crosshead guide hole 210. The rear end of channel 220 enters the rear end of crosshead guide hole 210. A portion of the oil and gas can then flow back into the crankcase 100 through the rear end of crosshead guide hole 210, while another portion flows towards the front end of crosshead guide hole 210. As the crosshead slides along the first direction within crosshead guide hole 210, the pressure at the rear end of crosshead guide hole 210 gradually increases. Oil and gas within crosshead guide hole 210 can then enter the rear end of fluid channel 220 and the crankcase 100 from the rear end of crosshead guide hole 210. As the crosshead continues to slide, the pressure at the rear end of crosshead guide hole 210 continues to increase, allowing oil and gas to enter the front end of crosshead guide hole 210 from the front end of fluid channel 220. Therefore, this embodiment achieves self-circulation of oil and gas without the need for external circulation equipment.

[0034] In some embodiments, a first connecting hole can be formed on the connecting wall between the front end of each crosshead guide hole 210 and the front end of the fluid channel 220 corresponding to that crosshead guide hole 210, thereby connecting the front end of each crosshead guide hole 210 and the front end of its corresponding fluid channel 220; similarly, a second connecting hole can be formed on the connecting wall between the rear end of each crosshead guide hole 210 and the rear end of its corresponding fluid channel 220, thereby connecting the rear end of each crosshead guide hole 210 and the rear end of its corresponding fluid channel 220. However, in this embodiment, the first and second connecting holes are formed on the connecting wall inside the crosshead box 200, which reduces the structural strength of the crosshead box 200.

[0035] In one optional embodiment, the fluid channel 220 extends through the crosshead box 200 along a first direction. A first connecting groove 230 is provided between the front end of each crosshead guide hole 210 and the front end of its corresponding fluid channel 220. The first connecting groove 230 is located on the front end face, and its two ends are respectively connected to the front end of the crosshead guide hole 210 and the front end of the fluid channel 220. A second connecting groove is provided between the rear end of each crosshead guide hole 210 and the rear end of its corresponding fluid channel 220. The second connecting groove is located on the rear end face, and its two ends are respectively connected to the rear end of the crosshead guide hole 210 and the rear end of the fluid channel 220. In this embodiment, after the front end face of the crosshead box 200 is connected to the connecting end face of the hydraulic pump head body, the front end face of the crosshead box 200 will fit against the connecting end face of the hydraulic pump head body. At this time, the connecting end face of the hydraulic pump head body can block the opening of the first connecting groove 230, thereby forming a flow channel. Similarly, after the rear end face of the crosshead box 200 is connected to the end face of the front end plate 111 of the crankcase 100, the rear end face of the crosshead box 200 will fit against the end face of the front end plate 111 of the crankcase 100. The end face of the front end plate 111 of the crankcase 100 can block the opening of the second connecting groove, thereby forming a flow channel. Therefore, the first connecting groove 230 is located on the front end face of the crosshead box 200, and the second connecting groove is located on the rear end face of the crosshead box 200. That is, neither the first connecting groove 230 nor the second connecting groove is located on the connecting wall between the crosshead guide hole 210 and the fluid channel 220 corresponding to the crosshead guide hole 210. Therefore, this embodiment will not affect the internal structure of the crosshead box 200. Thus, compared to the previous embodiment, the crosshead box 200 of this embodiment has higher structural strength.

[0036] Optionally, both the first connecting groove 230 and the second connecting groove can be rectangular grooves. Since the included angle between the bottom wall and the side wall of the rectangular groove is 90°, a large internal stress will be formed at the intersection of the bottom wall and the side wall during the casting process, which will reduce the structural strength of the crosshead box 200. In an optional embodiment, the first connecting groove 230 has a first bottom wall 231, a first side wall 232, and a second side wall 233. The first side wall 232 and the second side wall 233 are both connected to the first bottom wall 231 and are arranged opposite to each other. The first bottom wall 231, the first side wall 232, and the second side wall 233 are all planar. In a first direction, the distance between the first side wall 232 and the second side wall 233 gradually decreases, that is, at least one of the first side wall 232 and the second side wall 233 has an angle greater than 90° with the first bottom wall 231. The second connecting groove has a second bottom wall, a third side wall, and a fourth side wall. The third side wall and the fourth side wall are both connected to the second bottom wall and are arranged opposite to each other. The second bottom wall, the third side wall, and the fourth side wall are all planar. In a first direction, the distance between the third side wall and the fourth side wall gradually increases, that is, at least one of the third side wall and the fourth side wall has an angle greater than 90° with the second bottom wall. In this embodiment, the angle between at least one of the first sidewall 232 and the second sidewall 233 and the first bottom wall 231 is greater than 90°. Therefore, during the casting process, at least one of the intersections of the first sidewall 232 and the first bottom wall 231, and the intersection of the second sidewall 233 and the first bottom wall 231, will not generate significant stress. Similarly, the angle between at least one of the third sidewall and the fourth sidewall and the second bottom wall is greater than 90°. Therefore, during the casting process, at least one of the intersections of the third sidewall and the second bottom wall, and the intersection of the fourth sidewall and the second bottom wall, will not generate significant stress. Therefore, compared to the previous embodiment, the crosshead box 200 of this embodiment has higher structural strength. In addition, compared to the previous embodiment, the cross-sectional areas of the first connecting groove 230 and the second connecting groove in this embodiment are larger, thus providing stronger oil and gas transport capacity and improving the oil and gas self-circulation effect.

[0037] As the crosshead slides back and forth in the crosshead guide hole 210, it applies a vertical force to the crosshead box 200, causing the crosshead box 200 to tend to bend vertically. In an optional embodiment, at least one fluid channel 220 is provided with a reinforcing beam 300; the reinforcing beam 300 extends from the front end of the fluid channel 220 along a first direction to the rear end of the fluid channel 220; or, there are multiple reinforcing beams 300, spaced apart along the first direction, each extending along a second direction, wherein the second direction is perpendicular to both the first direction and the vertical direction. In this embodiment, by providing reinforcing beams 300 in the fluid channel 220, the bending stiffness of the crosshead box 200 in the vertical direction can be improved. When the crosshead applies a vertical force to the crosshead box 200, the reinforcing beams 300 can resist the tendency of the crosshead box 200 to bend vertically, thereby reducing the risk of damage to the crosshead box 200. Furthermore, compared to embodiments where the reinforcing beam 300 is located on the top or bottom surface of the crosshead box 200, this embodiment places the reinforcing beam 300 within the fluid channel 220, which reduces the external dimensions of the crosshead box 200.

[0038] In one alternative embodiment, the reinforcing beam 300 is disposed on the inner wall of the fluid channel 220 near the crosshead guide hole 210. Compared to other inner walls of the fluid channel 220, the force exerted by the crosshead on the inner wall of the fluid channel 220 near the crosshead guide hole 210 is greater. Therefore, in this embodiment, the reinforcing beam 300 is disposed on the inner wall of the fluid channel 220 near the crosshead guide hole 210, which can better resist the force exerted by the crosshead.

[0039] In an optional embodiment, the crosshead box 200 has a plurality of connecting portions 240 spaced apart in a second direction. A crosshead guide hole 210 is provided between two adjacent connecting portions 240. The connecting portion 240 includes a central region and side regions located on both sides of the central region in the vertical direction. The thickness of the side regions gradually increases in the direction extending from the central region to the side regions. At least one unloading hole 241 is provided in the side region, and the unloading hole 241 penetrates the crosshead box 200 in a first direction. The second direction is perpendicular to both the first direction and the vertical direction. In this embodiment, the central region of the connecting portion 240 is the region extending from the axis of the crosshead guide hole 210 to both sides in the vertical direction. The size of this region can be selected according to different processing techniques. The thickness of the connecting portion 240 refers to the thickness of the connecting portion 240 in the second direction. The crosshead guide hole 210 can be a circular hole. Therefore, the thickness of the central region opposite to the axis of the crosshead guide hole 210 is smaller, and the thickness of the side regions located on both sides of the central region is larger. During the casting process, when transitioning from a thinner to a thicker region, significant internal stress can easily occur near the intersection of the thinner and thicker regions, which can reduce the structural strength of the casting. In this embodiment, providing at least one unloading hole 241 in the thicker side region reduces the thickness of the side region, thus mitigating the risk of significant internal stress occurring near the intersection of the middle and side regions during the transition from the middle region to the side region. In an optional embodiment, the crosshead box 200 is further provided with multiple first connecting holes 250 for the first connecting bolts to pass through. The first connecting holes 250 penetrate the crosshead box 200 along a first direction. Multiple connecting protrusions 400 are respectively provided on the top and bottom surfaces of the crosshead box 200. Each connecting protrusion 400 has a second connecting hole 410, located near the rear end face. The connecting protrusion 400 also has a second connecting hole 410 that penetrates the connecting protrusion along the first direction for the second connecting bolts to pass through. In this embodiment, the first connecting bolt can pass through the first connecting hole 250 and be connected to the crankcase 100, and the second connecting bolt can be connected to the crankcase 100 through the second connecting hole 410. That is, the crosshead housing 200 can be fixed to the crankcase 100 using two types of connecting bolts. Compared to a solution where the crosshead housing 200 is connected to the crankcase 100 using only the first or second connecting bolt, this embodiment improves the connection strength between the crosshead housing 200 and the crankcase 100. Furthermore, in this embodiment, the second connecting hole 410 is located on the connecting protrusion 400, eliminating the need for additional connecting holes on the crosshead housing 200, thereby improving the structural strength of the crosshead housing 200.

[0040] In one alternative embodiment, the crosshead box 200 is manufactured by casting. Compared to a welded crosshead box 200, the cast crosshead box 200 has higher structural strength, and the casting process is simpler and has lower manufacturing costs.

[0041] Optionally, the crankcase 100 can be welded. However, a welded crankcase 100 has numerous weld points, which not only increases manufacturing costs but also reduces the structural strength of the resulting crankcase 100. In an optional embodiment, the crankcase 100 includes multiple housing units 110, which are manufactured by casting. Adjacent housing units 110 are welded together. This embodiment first casts multiple housing units 110 and then welds them sequentially to form the crankcase 100. This reduces the number of weld points, increases the structural strength of the crankcase 100, and lowers its manufacturing cost. Optionally, the housing unit 110 includes a vertical plate 116, a top plate 112, a front plate 111, a rear plate 114, a support member 113, and a support leg 115. The top plate 112 is located on top of the vertical plate 116, the front plate 111 is located on the front side of the vertical plate 116, the rear plate 114 is located on the rear side of the vertical plate 116, the support leg is located at the bottom of the vertical plate 116, and the support member 113 is located on both sides of the vertical plate 116 in the left-right direction.

[0042] This application embodiment also provides a plunger pump, including the power end housing as described in any of the above embodiments. In this application embodiment, the crosshead housing 200 includes a crosshead guide hole 210 and a fluid channel 220, and the front end of the crosshead guide hole 210 is connected to the front end of the fluid channel 220, and the rear end of the crosshead guide hole 210 is connected to the rear end of the fluid channel 220. During the process of the crosshead sliding in the crosshead guide hole 210 in a direction opposite to the first direction, the pressure at the front end of the crosshead guide hole 210 gradually increases, and the oil and gas in the crosshead guide hole 210 can enter the front end of the fluid channel 220 from the front end of the crosshead guide hole 210. At the same time, the oil and gas in the crankcase 100 can enter the crosshead guide hole 210. As the crosshead continues to slide, the pressure at the front end of the crosshead guide hole 210 continues to increase. At this time, the oil and gas can enter the fluid channel 220 from the front end of the crosshead guide hole 210. The rear end of channel 220 enters the rear end of crosshead guide hole 210. A portion of the oil and gas can then flow back into the crankcase 100 through the rear end of crosshead guide hole 210, while another portion flows towards the front end of crosshead guide hole 210. As the crosshead slides along the first direction within crosshead guide hole 210, the pressure at the rear end of crosshead guide hole 210 gradually increases. Oil and gas within crosshead guide hole 210 can then enter the rear end of fluid channel 220 and the crankcase 100 from the rear end of crosshead guide hole 210. As the crosshead continues to slide, the pressure at the rear end of crosshead guide hole 210 continues to increase, allowing oil and gas to enter the front end of crosshead guide hole 210 from the front end of fluid channel 220. Therefore, this embodiment achieves self-circulation of oil and gas without the need for external circulation equipment.

[0043] like Figure 8 As shown, this application embodiment also provides a processing technology for the power end housing of a plunger pump, applied to the power end housing described in any of the above embodiments, including:

[0044] S100, casting multiple shell units 110;

[0045] S200. Multiple housing units 110 are welded in sequence to form crankcase 100;

[0046] Intermittent welding or continuous welding can be used here.

[0047] S300, Cast crosshead box 200;

[0048] S400, Connect the crankcase 100 and the crosshead case 200.

[0049] In this embodiment, multiple housing units 110 are first cast, and then the multiple housing units 110 are welded sequentially to form the crankcase 100. This reduces the number of weld points, improves the structural strength of the crankcase 100, and reduces the manufacturing cost of the crankcase 100. Furthermore, the cast crosshead case 200 has high structural strength, and the casting process is simple and has low manufacturing cost.

[0050] The foregoing embodiments of this application focus on describing the differences between various embodiments. As long as the different optimization features between embodiments are not contradictory, they can be combined to form better embodiments. For the sake of brevity, these differences will not be elaborated upon here. The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art, under the guidance of this application, can make many modifications without departing from the spirit and scope of the claims, all of which fall within the protection scope of this application.

Claims

1. A power end housing of a plunger pump, characterized by, It includes a crankcase (100) and a crosshead case (200), the crankcase (100) is connected to the crosshead case (200), the crosshead case (200) has a front end face and a rear end face, and the crosshead case (200) is provided with a plurality of crosshead guide holes (210) that penetrate the crosshead case (200) along a first direction. Above and / or below each of the crosshead guide holes (210), a fluid channel (220) is provided, which passes through the crosshead box (200) along the first direction. A first connecting groove (230) is provided between the front end of each of the crosshead guide holes (210) and the front end of the corresponding fluid channel (220). The first connecting groove (230) is located on the front end face, and the two ends of the first connecting groove (230) are respectively connected to the front end of the crosshead guide hole (210) and the front end of the fluid channel (220). A second connecting groove is provided between the rear end of each of the crosshead guide holes (210) and the rear end of the corresponding fluid channel (220). The second connecting groove is located on the rear end face, and its two ends are respectively connected to the rear end of the crosshead guide hole (210) and the rear end of the fluid channel (220). Wherein, the first direction is the direction extending from the front end toward the rear end.

2. The power end housing according to claim 1, characterized in that, The first connecting groove (230) has a first bottom wall (231), a first side wall (232) and a second side wall (233). The first side wall (232) and the second side wall (233) are both connected to the first bottom wall (231) and are arranged opposite to each other. The first bottom wall (231), the first side wall (232) and the second side wall (233) are all planar. In the first direction, the distance between the first side wall (232) and the second side wall (233) gradually decreases. The second connecting groove has a second bottom wall, a third side wall and a fourth side wall. The third side wall and the fourth side wall are both connected to the second bottom wall and are arranged opposite to each other. The second bottom wall, the third side wall and the fourth side wall are all planar. In the first direction, the distance between the third side wall and the fourth side wall gradually increases.

3. The power end housing according to claim 1, characterized in that, At least one of the fluid channels (220) is provided with a reinforcing beam (300); The reinforcing beam (300) extends from the front end of the fluid channel (220) along the first direction to the rear end of the fluid channel (220); or, there are multiple reinforcing beams (300), which are spaced apart along the first direction, and each reinforcing beam (300) extends along a second direction. The second direction is perpendicular to both the first direction and the vertical direction.

4. The power end housing according to claim 3, characterized in that, The reinforcing beam (300) is located on the inner wall of the fluid channel (220) near the crosshead guide hole (210).

5. The power end housing according to claim 1, characterized in that, The crosshead box (200) has a plurality of connecting parts (240) spaced apart in a second direction, and a crosshead guide hole (210) is provided between two adjacent connecting parts (240). The connecting portion (240) includes a central region and side regions located on both sides of the central region in the vertical direction. The thickness of the side regions gradually increases in the direction extending from the central region to the side regions. At least one unloading hole (241) is provided in the side regions. The unloading hole (241) penetrates the crosshead box (200) in the first direction. The second direction is perpendicular to both the first direction and the vertical direction.

6. The power end housing according to claim 1, characterized in that, The crosshead box (200) is also provided with a plurality of first connecting holes (250) through which the first connecting bolts pass, and the first connecting holes (250) penetrate the crosshead box (200) along the first direction. The top and bottom surfaces of the crosshead box (200) are respectively provided with a plurality of connecting protrusions (400). The connecting protrusions (400) are provided with a second connecting hole (410). The connecting protrusions (400) are located close to the rear end face. The connecting protrusions (400) are provided with a second connecting hole (410) that passes through the connecting protrusions (400) in a first direction for the second connecting bolt to pass through.

7. The power end housing according to claim 1, characterized in that, The crosshead box (200) is manufactured by casting.

8. The power end housing according to claim 1, characterized in that, The crankcase (100) includes multiple housing units (110), which are manufactured by casting and adjacent housing units (110) are welded together.

9. A plunger pump, characterized in that, Includes the power end housing as described in any one of claims 1 to 8.

10. A processing method for the power end housing of a plunger pump, applied to the power end housing according to any one of claims 1 to 8, characterized in that, include: Cast multiple shell units (110); The plurality of housing units (110) are welded in sequence to form the crankcase (100). Cast the crosshead box (200); Connect the crankcase (100) and the crosshead case (200).

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