Crosshead structure for plunger pump and plunger pump

Abstract

The invention relates to the technical field of oil and gas exploitation equipment, and discloses a crosshead structure for a plunger pump and the plunger pump, the crosshead structure comprises a crosshead and a crosshead cylinder sleeve, the crosshead is movably arranged in the crosshead cylinder sleeve, a molded line structure is arranged on the outer surface of the crosshead, and the crosshead cylinder sleeve is movably arranged in the crosshead cylinder sleeve. And / or the inner surface of the crosshead cylinder sleeve is provided with a reticulate pattern structure, so that a lubricating oil film is formed between the crosshead and the crosshead cylinder sleeve. A dynamic oil film can be well formed and kept between the crosshead and the crosshead cylinder sleeve, the good lubricating effect is achieved, the friction work between the crosshead and the crosshead cylinder sleeve is greatly reduced, the mechanical loss of the plunger pump is reduced, and the pump efficiency of the plunger pump is improved; the molded line structure and / or the reticulate pattern structure can provide good abrasion resistance, the abrasion risk between the crosshead and the crosshead cylinder sleeve is reduced, and the reliability of the plunger pump is improved. And a better lubricating effect can be achieved by using less lubricating oil, so that the use cost of the plunger pump can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas production equipment, and in particular to a crosshead structure for a plunger pump and a plunger pump. Background Art

[0002] The plunger pump is a core product for oilfield fracturing operations. The function of the plunger pump is to pump high-pressure fracturing fluid into the oil well or gas well to achieve production bottom fracture and increase oilfield production. The crosshead and crosshead cylinder liner structure are key materials for the plunger pump. Its function is to convert the rotary motion of the power end of the plunger pump into reciprocating motion, and then transfer the reciprocating motion to the hydraulic end to achieve the purpose of pumping high-pressure fluid by the hydraulic end. During the high-pressure fluid discharge process, the lateral force generated by the crosshead directly acts on the crosshead cylinder liner. The crosshead and the crosshead cylinder liner reciprocate for a long time under the action of the lateral force. The wear failure between the crosshead and the crosshead cylinder liner is one of the main failure modes of the plunger pump, so the crosshead and the crosshead cylinder liner are required to have good lubrication and wear resistance.

[0003] The structural design of the crosshead and crosshead cylinder sleeve of the traditional plunger pump is to embed a crosshead copper sleeve in the crosshead cylinder sleeve to improve the wear resistance between the crosshead and the crosshead cylinder sleeve, and a lubricating oil port is designed on the crosshead cylinder sleeve structure to provide sufficient lubricating oil between the crosshead cylinder sleeve and the crosshead to ensure the lubrication performance between the crosshead cylinder sleeve and the crosshead. The working surface between the crosshead and the crosshead cylinder sleeve is a flat structure, which is not conducive to the formation of a hydraulic lubricating oil film during the reciprocating motion of the crosshead, and the oil storage capacity between the crosshead and the cylinder sleeve is poor. It only relies on the lubrication system to provide sufficient lubricating oil to meet the lubrication needs between the crosshead and the crosshead cylinder sleeve. This places high requirements on the lubrication system, making the overall lubrication system design cost and subsequent maintenance cost high. Summary of the invention

[0004] The present application aims to at least solve the technical problems in the prior art that the crosshead structure is not conducive to the formation of a hydraulic lubricating oil film, and the lubrication system design cost and subsequent maintenance cost are high.

[0005] In order to solve the above technical problems, the present application provides a crosshead structure for a plunger pump, including a crosshead and a crosshead cylinder sleeve, wherein the crosshead is movably arranged in the crosshead cylinder sleeve, the outer surface of the crosshead is provided with a profile structure, and / or the inner surface of the crosshead cylinder sleeve is provided with a mesh structure, so that a lubricating oil film is formed between the crosshead and the crosshead cylinder sleeve.

[0006] In some embodiments, the profile structure includes a circumferential profile arranged along its circumference, and the circumferential profile is an elliptical profile or a quasi-elliptical profile.

[0007] In some embodiments, the minor axis of the elliptical line or quasi-elliptical line is arranged along the transverse direction of the crosshead.

[0008] In some embodiments, the profile structure includes an axial profile arranged along its axial direction, and the axial profile is a convex profile.

[0009] In some embodiments, the outer surface of the crosshead is provided with a friction reducing coating.

[0010] In some embodiments, the anti-friction coating is made of at least one of molybdenum disulfide, graphite and polytetrafluoroethylene.

[0011] In some embodiments, the inner surface of the crosshead cylinder sleeve is provided with a mesh structure that matches the profile structure.

[0012] In some embodiments, the textured structure comprises a plurality of mutually staggered grooves, wherein the grooves are shallow grooves; or

[0013] The textured structure comprises a plurality of independent grooves arranged in an array, and the grooves are micro-dimpled structures; or

[0014] The mesh structure includes a plurality of independent protrusions arranged in an array, and concave portions are formed between adjacent protrusions. The protrusions are micro-convex structures.

[0015] In some embodiments, the crosshead cylinder sleeve and the power end housing of the plunger pump are of a split structure, and a cylinder sleeve support seat for mounting the crosshead cylinder sleeve is provided on the power end housing.

[0016] In some embodiments, the profile structure cooperates with the textured structure.

[0017] An embodiment of the present application also provides a plunger pump, which includes the above-mentioned crosshead structure.

[0018] The crosshead structure for the plunger pump and the plunger pump provided in the embodiment of the present application are designed with a profile structure on the outer surface of the crosshead and / or a mesh structure on the inner surface of the crosshead cylinder sleeve. The profile structure and / or the mesh structure have the function of storing oil and forming an oil film, and can well form and maintain a dynamic oil film between the crosshead and the crosshead cylinder sleeve to achieve a good lubrication effect, greatly reduce the friction work between the crosshead and the crosshead cylinder sleeve during the reciprocating motion between the crosshead and the crosshead cylinder sleeve, reduce wear, reduce the mechanical loss of the plunger pump, and improve the pump efficiency of the plunger pump; in addition, the profile structure and / or the mesh structure can provide good wear resistance, reduce the risk of wear between the crosshead and the crosshead cylinder sleeve, and improve the reliability of the plunger pump; in addition, the crosshead can achieve a better lubrication effect by using less lubricating oil during the reciprocating operation of the crosshead in the crosshead cylinder sleeve, which can reduce the demand for lubricating oil by the plunger pump and reduce the use cost of the plunger pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A cross-sectional view of a plunger pump according to an embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the structure of the crosshead of an embodiment of the present application;

[0022] Figure 3 Another structural schematic diagram of the crosshead of an embodiment of the present application (including a cross section);

[0023] Figure 4 A schematic diagram of the cross-sectional structure of a crosshead according to an embodiment of the present application;

[0024] Figure 5 A schematic diagram of a cross-sectional profile of a crosshead according to an embodiment of the present application;

[0025] Figure 6 It is a schematic diagram of the longitudinal cross-section structure of the crosshead of an embodiment of the present application;

[0026] Figure 7 A schematic diagram of a longitudinal cross-section profile of a crosshead according to an embodiment of the present application;

[0027] Figure 8 This is a schematic structural diagram of a crosshead cylinder sleeve according to an embodiment of the present application;

[0028] Fig. 9 This is a schematic structural diagram of a crosshead cylinder sleeve and a power end housing according to an embodiment of the present application;

[0029] Fig.10 for Fig. 9 Enlarged cross-sectional view of section A in the box.

[0030] Reference numerals:

[0031] 1-crosshead, 11-profile structure, 111-circumferential profile, 112-axial profile, 12-main thrust side of crosshead, 13-crosshead cross section, 14-crosshead longitudinal section, 15-thrust shaft, 16-crosshead pin hole, 17-friction-reducing coating; 2-crosshead cylinder liner, 21-net structure;

[0032] 20-power end housing, 201-cylinder liner support seat; 30-connecting rod assembly; 40-crosshead pin; 50-crankshaft assembly; 60-hydraulic end assembly, 601-plunger. DETAILED DESCRIPTION

[0033] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0034] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present application will occur to those skilled in the art.

[0035] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0036] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0037] It should also be understood that, although the present application has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present application that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0038] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

[0039] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present application. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.

[0040] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.

[0041] Figures 1 to 10 The schematic diagram of the structure of the crosshead structure for the plunger pump provided in the embodiment of the present application is shown. Figures 1 to 10As shown, an embodiment of the present application provides a crosshead structure for a plunger pump, including a crosshead 1 and a crosshead cylinder sleeve 2, wherein the crosshead 1 is movably arranged in the crosshead cylinder sleeve 2, the outer surface of the crosshead 1 is provided with a profile structure 11, and / or the inner surface of the crosshead cylinder sleeve 2 is provided with a mesh structure 21, so that a lubricating oil film is formed between the crosshead 1 and the crosshead cylinder sleeve 2.

[0042] The crosshead 1 is a key material of the plunger pump. The crosshead structure is located in the power end assembly of the plunger pump. The crosshead cylinder sleeve 2 is installed in the power end housing 20. The crosshead 1 and the connecting rod assembly 30 are connected together through the crosshead pin 40. The small head part of the crosshead 1 and the connecting rod assembly 30 is located in the crosshead cylinder sleeve 2. The crosshead 1, the connecting rod assembly 30 and the crankshaft assembly 50 form a crank-connecting rod mechanism, which can convert the rotational motion of the crankshaft assembly 50 into reciprocating motion between the crosshead 1 and the crosshead cylinder sleeve 2, thereby driving the plunger 601 in the hydraulic end assembly 60 to reciprocate together, and realize the pumping of the high-pressure fluid in the hydraulic end assembly 60. The main structures of the crosshead 1 and the crosshead cylinder sleeve 2 are both cylindrical structures.

[0043] like Figure 1 , Figure 2 and Figure 8 As shown, during the operation of the plunger pump, the crankshaft assembly 50 rotates in the counterclockwise direction, and the crankshaft assembly 50 pushes the crosshead 1 downward through the connecting rod assembly 30. The crosshead main thrust side 12 is subjected to greater pressure, which will cause the position between the crosshead main thrust side 12 and the crosshead cylinder sleeve 2 to suffer greater wear. In order to improve the load and wear of the crosshead main thrust side 12, in the present application, a profile structure 11 is designed on the outer circular structure of the crosshead 1 and / or a mesh structure 21 is designed on the inner surface of the crosshead cylinder sleeve 2. The profile structure 11 and / or the mesh structure 21 have the function of storing oil and forming an oil film, which can well protect the crosshead 1 and the crosshead cylinder sleeve 2. A dynamic oil film is formed and maintained between the crosshead 1 and the crosshead cylinder sleeve 2 to achieve a better lubrication effect, and the friction work between the crosshead 1 and the crosshead cylinder sleeve 2 is greatly reduced during the reciprocating motion between the crosshead 1 and the crosshead cylinder sleeve 2, thereby reducing wear, reducing the mechanical loss of the plunger pump, and improving the pump efficiency of the plunger pump; in addition, the profile structure 11 and / or the mesh structure 21 can provide good wear resistance, reduce the risk of wear between the crosshead 1 and the crosshead cylinder sleeve 2, and improve the reliability of the plunger pump; in addition, the crosshead 1 can achieve a better lubrication effect by using less lubricating oil during the reciprocating operation in the crosshead cylinder sleeve 2, which can reduce the plunger pump's demand for lubricating oil and reduce the use cost of the plunger pump.

[0044] The plunger pump including the above crosshead structure is preferably used in oilfield fracturing operations, which can effectively meet the reciprocating motion requirements between the crosshead 1 and the crosshead cylinder sleeve 2, provide good lubrication and wear resistance, and reduce the cost of fracturing operations. The plunger pump can also be used in coal mining and other scenarios, and its specific application scope is not specifically limited in this application.

[0045] In some embodiments, the profile structure 11 includes a circumferential profile 111 arranged along the circumference of the crosshead 1, and the circumferential profile 111 is an elliptical profile or a quasi-elliptical profile. The circumferential profile 111 refers to the cross-sectional profile of the crosshead 1, which is a non-circular shape such as an elliptical shape or a quasi-elliptical shape.

[0046] like Figures 3 to 5 As shown, on the crosshead cross section 13, the axis along the vertical direction of the main thrust side 12 of the crosshead is called the thrust axis 15, and the direction of the thrust axis 15 is perpendicular to the direction of the crosshead pin hole 16 (the axial direction of the pin hole). The profile in the direction of the thrust axis 15 is a circular contour in the direction of the major axis of the ellipse, which can achieve maximum stability for the crosshead 1 and the crosshead cylinder liner 2 during reciprocating operation, so that the main thrust side 12 of the crosshead can be better loaded.

[0047] Furthermore, the minor axis of the elliptical line or the quasi-elliptical line is arranged along the transverse direction of the crosshead 1 .

[0048] The lateral direction of the crosshead 1 is the direction of the crosshead pin hole 16. Since the crosshead pin 40 has stabilized the structure of the crosshead 1 and its connecting rod assembly 30 in the direction of the crosshead pin hole 16, the profile in the direction of the crosshead pin hole 16 is designed as a circular contour in the direction of the minor axis of the ellipse, which can reduce unnecessary friction, reduce the mechanical loss of the plunger pump, and improve the pump efficiency of the plunger pump.

[0049] In some embodiments, the profile structure 11 includes an axial profile 112 arranged along the axial direction of the crosshead 1, and the axial profile 112 is a convex profile.

[0050] like Figure 1 , Figure 3 , Figure 6 and Figure 7 As shown, the axial profile 112 refers to the profile of the crosshead longitudinal section 14, which is a drum-shaped shape with a slight bulge in the middle, that is, a convex profile. The structure of this profile can, on the one hand, form a stable base with a smooth contour on the outer surface of the crosshead 1, thereby increasing the durability of the crosshead 1; on the other hand, it can reduce the contact surface between the crosshead 1 and the crosshead cylinder liner 2 during the reciprocating motion, thereby reducing the friction between the crosshead 1 and the crosshead cylinder liner 2, reducing the mechanical loss of the plunger pump, and improving the pump efficiency of the plunger pump.

[0051] In some embodiments, Figure 2As shown, the outer surface of the crosshead 1 is provided with a friction-reducing coating 17. The friction-reducing coating 17 can improve the self-lubricating property of the outer surface of the crosshead 1, further improve the lubrication effect between the crosshead 1 and the crosshead cylinder sleeve 2, and reduce the wear between the crosshead 1 and the crosshead cylinder sleeve 2.

[0052] Optionally, the material of the friction-reducing coating 17 is at least one of molybdenum disulfide, graphite and polytetrafluoroethylene.

[0053] The mesh structure 21 can be formed on the inner surface of the crosshead cylinder sleeve 2 through mechanical processing. Compared with the structure of the crosshead cylinder sleeve used in the conventional plunger pump, in which the crosshead copper sleeve is embedded in the inner surface, in this embodiment, the mesh structure 21 is directly processed on the inner surface of the crosshead cylinder sleeve 2. The mesh structure 21 can increase the friction area and surface roughness of the inner surface of the crosshead cylinder sleeve 2, making it easier for the lubricating oil to be stored and attached to the inner wall of the crosshead cylinder sleeve 2, which is conducive to the formation of a tiny oil film, effectively reducing the direct contact between the crosshead 1 and the crosshead cylinder sleeve 2, thereby reducing the friction coefficient, reducing the friction in the reciprocating motion of the crosshead 1 and the crosshead cylinder sleeve 2, reducing wear, and improving the reliability of the crosshead cylinder sleeve 2 product, thereby increasing the service life of the crosshead cylinder sleeve 2. The mesh structure 21 can increase the inner surface area of ​​the crosshead cylinder sleeve 2, thereby enhancing heat conduction and heat dissipation. During the operation of the plunger pump, by increasing the inner surface area and surface roughness of the crosshead cylinder sleeve 2, heat dissipation is facilitated, making the operation of the plunger pump more stable. The textured structure 21 on the inner surface of the crosshead cylinder sleeve 2 can provide good lubrication and wear resistance between the crosshead 1 and the crosshead cylinder sleeve 2, can meet the reciprocating motion requirements between the crosshead 1 and the crosshead cylinder sleeve 2, and improve the working efficiency and durability of the plunger pump.

[0054] The traditional structure of embedding a crosshead copper sleeve has strict requirements on the roughness and dimensional tolerance of the inner and outer surfaces of the crosshead copper sleeve. The manufacturing cost of the crosshead copper sleeve is high, and the assembly process requires the use of liquid nitrogen and other materials for cooling and assembly, which also has strict requirements on assembly. In this embodiment, there is no need to embed a crosshead copper sleeve on the inner surface of the crosshead cylinder sleeve 2, and the processing and assembly precision are high and convenient, which can improve the assembly precision of the power end assembly and reduce the processing cost.

[0055] In some embodiments, Figure 8 As shown, the mesh structure 21 includes a plurality of mutually staggered grooves, and the grooves are shallow grooves.

[0056] Multiple grooves are arranged in a staggered manner horizontally and vertically. The grooves are used to store oil, which improves the lubrication effect. At the same time, the edges of the grooves are used to increase the surface roughness, which is conducive to heat dissipation, and improves the wear resistance between the crosshead 1 and the crosshead cylinder sleeve 2, thereby improving the reliability of the plunger pump. The grooves are set as shallow grooves to facilitate the flow of lubricating oil and the accumulation of lubricating oil in the grooves to ensure the lubrication effect. The shape of the grid formed by the staggered arrangement of multiple grooves horizontally and vertically can be diamond, square, etc.

[0057] In the above embodiments, multiple grooves are arranged in a staggered manner. In other embodiments, the textured structure 21 includes multiple independent grooves arranged in an array, and the grooves are micro-concave structures. The grooves can be used to store oil, and the edges of the grooves can be used to increase the surface roughness. The array can be multiple rows and columns, or a ring array, etc.

[0058] In some other embodiments, the mesh structure includes a plurality of independent protrusions arranged in an array, and concave portions are formed between adjacent protrusions, and the protrusions are micro-convex structures. The concave portions formed between adjacent protrusions can be used to store oil, and the surface roughness of the protrusions is added. This structure facilitates the flow of lubricating oil, but the oil storage effect of the concave portions may be poorer than that of the groove or recess structure.

[0059] In some embodiments, Fig. 9 and Fig.10 As shown, the crosshead cylinder sleeve 2 and the power end housing 20 of the plunger pump are of a split structure, and a cylinder sleeve support seat 201 for mounting the crosshead cylinder sleeve 2 is provided on the power end housing 20 .

[0060] In order to facilitate the processing of the inner mesh structure 21 of the crosshead cylinder sleeve 2, the crosshead cylinder sleeve 2 and the power end housing 20 are set as a split structure. A cylinder sleeve support seat 201 is set in the power end housing 20, and the crosshead cylinder sleeve 2 processed with the mesh structure 21 is assembled on the cylinder sleeve support seat 201 in the power end housing 20.

[0061] In some other embodiments, the crosshead cylinder sleeve 2 and the power end housing 20 of the plunger pump may also be an integrated structure. For example, the crosshead cylinder sleeve 2 and the power end housing 20 having the reticular structure 21 are formed by casting.

[0062] In one embodiment, the profile structure 11 cooperates with the mesh structure 221. When the outer surface of the crosshead 1 is provided with the profile structure 11, and the inner surface of the crosshead cylinder sleeve 2 is provided with the mesh structure 21, the profile structure 11 and the mesh structure 21 can be staggered (relative to the entire crosshead structure) to avoid the oil storage tank formed between the crosshead 1 and the crosshead cylinder sleeve 2 being too deep, resulting in lubrication accumulation and affecting the lubrication effect, and the groove of the mesh structure 21 can be set deeper or the profile structure 11 can be set more protruding to increase wear resistance and reduce the risk of wear between the crosshead 1 and the crosshead cylinder sleeve 2. In other embodiments, the profile structure 11 and the mesh structure 21 can also be arranged relative to each other to provide better lubrication performance during the relative reciprocating motion of the crosshead 1 and the crosshead cylinder sleeve 2. The mutual cooperation between the profile structure 11 and the mesh structure 221 can also be other cooperation methods. For example, the profile structure 11 is provided on the outer surface near the two ends of the crosshead 1 and the outer surface in the middle of the crosshead 1, and the mesh structure 21 is provided in the middle position of the crosshead cylinder sleeve 2 (the position corresponding to the profile structure 11 located on the outer surface in the middle of the crosshead) to ensure effective lubrication of the positions with more interactions, while the positions with less interactions at the two ends only need a small amount of lubrication. Other ways of cooperating between the profile structure 11 and the mesh structure 22 will not be described here.

[0063] The present application also provides a plunger pump, including the above crosshead structure. The plunger pump corresponds to the crosshead structure of the above embodiment, and any optional items in the crosshead structure embodiment are also applicable to the plunger pump embodiment, which will not be described in detail here.

[0064] The above description is only a preferred embodiment of the present application and an explanation of the applied technology. Those skilled in the art should understand that the scope of disclosure involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) and the technical solution formed.

[0065] In addition, although each operation is described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or to be performed in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the application. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0066] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. A crosshead structure for a plunger pump, characterized in that: It comprises a crosshead and a crosshead cylinder sleeve, wherein the crosshead is movably arranged in the crosshead cylinder sleeve, the outer surface of the crosshead is provided with a profile structure, and / or the inner surface of the crosshead cylinder sleeve is provided with a reticular structure, so that a lubricating oil film is formed between the crosshead and the crosshead cylinder sleeve.

2. The crosshead structure for a plunger pump according to claim 1, characterized in that: The profile structure includes a circumferential profile arranged along its circumference, and the circumferential profile is an elliptical profile or a quasi-elliptical profile.

3. The crosshead structure for a plunger pump according to claim 2, characterized in that: The minor axis of the elliptical line or quasi-elliptical line is arranged along the transverse direction of the crosshead.

4. The crosshead structure for a plunger pump according to claim 1, characterized in that: The profile structure comprises an axial profile arranged along its axial direction, and the axial profile is a convex profile.

5. The crosshead structure for a plunger pump according to claim 1, characterized in that: The outer surface of the crosshead is provided with a friction-reducing coating.

6. The crosshead structure for a plunger pump according to claim 5, characterized in that: The material of the friction-reducing coating is at least one of molybdenum disulfide, graphite and polytetrafluoroethylene.

7. The crosshead structure for a plunger pump according to claim 1, characterized in that: The reticular structure comprises a plurality of mutually staggered grooves, wherein the grooves are shallow grooves; or The textured structure comprises a plurality of independent grooves arranged in an array, and the grooves are micro-dimpled structures; or The mesh structure includes a plurality of independent protrusions arranged in an array, and concave portions are formed between adjacent protrusions. The protrusions are micro-convex structures.

8. The crosshead structure for a plunger pump according to claim 1, characterized in that: The crosshead cylinder sleeve and the power end housing of the plunger pump are of a split structure, and a cylinder sleeve support seat for mounting the crosshead cylinder sleeve is provided on the power end housing.

9. The crosshead structure for a plunger pump according to claim 1, characterized in that: The profile structure and the mesh structure cooperate with each other.

10. A plunger pump, characterized in that: The invention comprises the crosshead structure according to any one of claims 1 to 9.

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