Crosshead structure and fracturing pump

Abstract

The utility model discloses a crosshead structure and a fracturing pump, and relates to the field of oil and gas equipment. A crosshead structure of a fracturing pump comprises a crosshead main body, the crosshead main body comprises a first arc, a second arc, a third arc and a fourth arc, and the first arc, the second arc, the third arc and the fourth arc are sequentially arranged in the circumferential direction of the crosshead structure and define a multi-arc profile of the crosshead main body in the radial direction; the circle center of the first arc and the circle center of the third arc coincide at a first point, the distance from the first point to each point on the first arc is a first distance, the minimum distance from the first point to each point on the second arc is a second distance, and the distance from the first point to each point on the third arc is a third distance; the minimum distance from the first point to each point on the fourth arc is a fourth distance; the first distance is larger than the third distance, and the second distance is equal to the fourth distance and smaller than the third distance. The problem that the contact area of the crosshead and the sliding sleeve is prone to ablation can be solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil and gas equipment, and particularly relates to a crosshead structure and a fracturing pump. BACKGROUND

[0002] In the process of oil and gas exploitation, the fracturing pump is a device for pressurizing liquid by reciprocating motion of a plunger in a cylinder, and has the characteristics of compact structure, high pressure and high efficiency.

[0003] The crosshead, as an important component of the plunger pump, constitutes a crank connecting rod mechanism with a connecting rod, a crankshaft and bearings, etc. One end of the crosshead is connected with the crankshaft through the connecting rod, and the other end is connected with the plunger of the fluid end, so as to convert the rotary motion of the prime mover into reciprocating linear motion and realize the pumping operation at the fracturing site. The crosshead needs to bear the load transmitted by the high-pressure medium and the reciprocating inertia load during the operation of the plunger pump, and not only needs to ensure the structural strength, but also needs to ensure the lubrication effect of the components during movement to avoid ablation.

[0004] At present, in the crank slider mechanism of the commonly used plunger pump, the crosshead is axially movable in the barrel-shaped sliding sleeve. The crosshead is connected with one end of the connecting rod through a crosshead pin, and the other end of the connecting rod is clamped on the crank of the crankshaft. Because the gap between the crosshead and the sliding sleeve is too small, the stress generated on the crosshead by the working load transmitted by the high-pressure medium is large, which finally leads to the ablation problem in the contact area between the crosshead and the sliding sleeve. CONTENT OF THE INVENTION

[0005] The purpose of the embodiment of the application is to provide a crosshead structure of a fracturing pump, which can solve the problem of ablation in the contact area between the crosshead and the sliding sleeve.

[0006] In order to solve the above technical problems, the application is implemented as follows:

[0007] The embodiment of the application provides a crosshead structure of a fracturing pump, which comprises a crosshead main body.

[0008] The crosshead main body comprises a first circular arc, a second circular arc, a third circular arc and a fourth circular arc, the first circular arc, the second circular arc, the third circular arc and the fourth circular arc are sequentially arranged along the circumference of the crosshead structure, and the first circular arc, the second circular arc, the third circular arc and the fourth circular arc surround a multi-arc segment contour of the crosshead main body in the radial direction.

[0009] The center of the first circular arc and the center of the third circular arc coincide at a first point, the distance from the first point to each point on the first circular arc is a first distance, the minimum distance from the first point to each point on the second circular arc is a second distance, the distance from the first point to each point on the third circular arc is a third distance, and the minimum distance from the first point to each point on the fourth circular arc is a fourth distance.

[0010] The first distance is greater than the third distance, the second distance is equal to the fourth distance, and the second distance is less than the third distance.

[0011] The application further provides a fracturing pump comprising the cross head structure.

[0012] In the cross head body, the first distance between the first arc and the first point and the third distance between the third arc and the first point are both greater than the second distance between the second arc and the first point and the fourth distance between the fourth arc and the first point, and the first arc, the second arc, the third arc and the fourth arc can jointly form a multi-arc segment profile. In this way, in the case of cooperation between the cross head structure and the sliding sleeve, the second arc and the fourth arc can form a larger gap with the inner wall of the sliding sleeve, so that more lubricating oil can be accommodated between the second arc and the fourth arc and the inner wall of the sliding sleeve, and the flow of the lubricating oil is facilitated, and the first arc forms a smaller gap with the sliding sleeve to reduce the amount of lubricating oil leaking from the gap between the first arc and the sliding sleeve, thereby ensuring good lubricity between the cross head structure and the sliding sleeve and achieving good cooling effect. In addition, more lubricating oil can also reduce the interaction force between the cross head structure and the sliding sleeve, which is conducive to reducing the stress generated on the cross head structure and relieving the stress concentration problem, so that the phenomenon of ablation between the cross head structure and the sliding sleeve can be effectively prevented, and smooth sliding between the cross head structure and the sliding sleeve is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 A cross-sectional view of the cooperation between the cross head and the sliding sleeve in the related art is shown;

[0014] Figure 2 A partial view of the contact area between the bearing bush and the bush groove in the related art is shown;

[0015] Figure 3 A cross-sectional view of the cooperation between the cross head structure and the sliding sleeve disclosed in the application is shown;

[0016] Figure 4 A first cross-sectional view of the cross head structure disclosed in the application is shown;

[0017] Figure 5 A partial view of the cross head structure at the skirt portion disclosed in the application is shown;

[0018] Figure 6 A longitudinal cross-sectional view of the cross head structure disclosed in the application is shown;

[0019] Figure 7 A second cross-sectional view of the cross head structure disclosed in the application is shown;

[0020] Figure 8 Partial view of the crosshead structure disclosed in the embodiments of the present application at the second oil groove and the third oil groove;

[0021] Figure 9 First view of the crosshead structure disclosed in the embodiments of the present application at the shoe groove;

[0022] Figure 10 Second view of the crosshead structure disclosed in the embodiments of the present application at the shoe groove;

[0023] Figure 11 Third view of the crosshead structure disclosed in the embodiments of the present application at the shoe groove.

[0024] Explanation of reference signs:

[0025] 001-crosshead; 002-piston sleeve;

[0026] 01-crosshead structure;

[0027] 10-crosshead body; 11-first circular arc; 12-second circular arc; 13-third circular arc; 14-fourth circular arc; O-first point; La-first distance; Lb-second distance; Lc-third distance; Ld-fourth distance; MN-first axis; θa-first central angle; θb-second central angle; θc-third central angle; θd-fourth central angle;

[0028] 21-first transition surface; 22-second transition surface;

[0029] 31-first oil groove; 32-second oil groove; 33-third oil groove;

[0030] 41-shoe groove; 42-first recess; 43-second recess;

[0031] 02-piston sleeve. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0033] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a class, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0034] The embodiments of the present application will be described in detail below with reference to specific examples and their application scenarios in conjunction with the accompanying drawings.

[0035] The crosshead 001 and the sliding sleeve 002 in the related art are as shown in Figure 1 , the crosshead 001 is designed as a structure with a circular cross section considering the fitting tolerance requirement between the crosshead 001 and the sliding sleeve 002. However, due to the vertical component of gravity and working load, the bottom surface of the crosshead 001 is in contact with the bottom surface of the sliding sleeve 002, and there is a large gap between the top surface of the crosshead 001 and the top surface of the sliding sleeve 002, so that the lubricating oil between the crosshead 001 and the sliding sleeve 002 quickly leaks through the large gap at the top, resulting in a decrease in lubricating pressure and flow in other parts of the lubricating system. In addition, the gap between the two side surfaces of the crosshead 001 and the two side surfaces of the sliding sleeve 002 is small, resulting in less storage of lubricating oil and difficulty in flowing, and easily forming a lubricating oil dead zone.

[0036] Based on the above situation, as shown in Figure 2 , when the fracturing pump is operated at high power, the vertical component of the working load increases, according to the contact relationship of Hertz stress, in the case of constant length L, the radial force P increases, the half-width a of the contact area increases, and the contact area S = 2a*L increases, which further worsens the lubrication condition of the contact area between the bottom surface of the crosshead 001 and the bottom surface of the sliding sleeve 002, and the gap on both sides of the crosshead 001 further decreases, resulting in the inability of the lubricating oil on the side to flow, and ultimately leading to high temperature of the lubricating oil between the bottom surface of the crosshead 001 and the bottom surface of the sliding sleeve 002, which easily causes ablation of the crosshead 001 and the sliding sleeve 002.

[0037] Based on the above situation, the crosshead structure 01 of the fracturing pump disclosed by the embodiments of the present application is as shown in Figures 3 to 11 , the disclosed crosshead structure 01 includes a crosshead body 10, wherein the crosshead body 10 includes a first circular arc 11, a second circular arc 12, a third circular arc 13 and a fourth circular arc 14.

[0038] The first arc 11, the second arc 12, the third arc 13 and the fourth arc 14 are sequentially arranged along the circumference of the cross head structure 01, and form a multi-arc segment profile of the cross head body 10 in the radial direction. Optionally, the first arc 11 and the third arc 13 can both be theoretical arcs, and the centers of the first arc 11 and the third arc 13 coincide at the first point O; the second arc 12 and the fourth arc 14 can both be connecting arcs, used to ensure smooth transition between the first arc 11 and the third arc 13. Exemplarily, in actual working conditions, the first arc 11 can be located at the top, the third arc 13 can be located at the bottom, and the second arc 12 and the fourth arc 14 can be located at the left side and the right side respectively. Optionally, the multi-arc segment profile can be an oval profile, an elliptical profile, a long circular profile, etc. It should be noted that the multi-arc segment profile can be understood as a profile formed by sequentially connecting and splicing a plurality of arc segments that are not completely concentric.

[0039] Further, the distance from the first point O to each point on the first arc 11 is a first distance La, the minimum distance from the first point O to each point on the second arc 12 is a second distance Lb, the distance from the first point O to each point on the third arc 13 is a third distance Lc, and the minimum distance from the first point O to each point on the fourth arc 14 is a fourth distance Ld. Among them, the first distance La is greater than the third distance Lc, the second distance Lb is equal to the fourth distance Ld, and the second distance Lb is less than the third distance Lc, that is, the first distance La is the largest, and the second distance Lb and the fourth distance Ld are the smallest. In this way, the size of the multi-arc segment profile in the direction from the first arc 11 to the third arc 13 is greater than the size in the direction from the second arc 12 to the fourth arc 14.

[0040] Considering that the second distance Lb and the fourth distance Ld are both less than the third distance Lc, that is, after passing the third arc 13, the positions on the second arc 12 and the fourth arc 14 respectively gradually approach the first point O, so that a larger side gap is formed between the second arc 12 and the fourth arc 14 and the inner wall of the sliding sleeve 02. Therefore, when the cross head structure 01 moves in the sliding sleeve 02, whether the radial force changes or not, the force at the contact part between the outer wall of the third arc 13 and the sliding sleeve 02 is basically unchanged, that is, the contact length of the cross head structure 01 and the sliding groove in the circumferential direction always remains the arc length of the third arc 13, so that the contact condition when the cross head structure 01 moves tends to be stable.

[0041] It should be noted that, due to the first distance La being the largest, the standard circular profile is equivalent to being elongated at the top without changing the bottom contact diameter, thereby reducing the top gap during the movement of the crosshead structure 01, and the smaller top gap forms a sealing area with the sealing sections (e.g., the first and second sealing sections described below) at both ends of the top oil groove (e.g., the first oil groove 31 described below), so that the oil in the top oil groove always maintains a certain pressure, thereby maintaining the pressure balance of the overall lubrication system.

[0042] Based on the above arrangement, when the crosshead structure 01 cooperates with the sliding sleeve 02, the second and fourth circular arcs 12 and 14 can form larger gaps with the inner wall of the sliding sleeve 02, so that more lubricating oil can be accommodated between the second and fourth circular arcs 12 and 14 and the inner wall of the sliding sleeve 02, and the flow of lubricating oil is facilitated, and a smaller gap is formed between the first circular arc 11 and the sliding sleeve 02 to reduce the amount of lubricating oil leaking from the gap between the first circular arc 11 and the sliding sleeve 02, which can ensure good lubrication between the crosshead structure 01 and the sliding sleeve 02 and achieve good cooling effect, and more lubricating oil can also reduce the force between the crosshead structure 01 and the sliding sleeve 02, which is beneficial to reducing the stress generated on the crosshead structure 01 and relieving the stress concentration problem, thereby effectively preventing the phenomenon of ablation between the crosshead structure 01 and the sliding sleeve 02, and ensuring smooth sliding between the crosshead structure 01 and the sliding sleeve 02.

[0043] In some embodiments, the difference between the first distance La and the second distance Lb is a first difference, the difference between the first distance La and the third distance Lc is a second difference, and the first difference is greater than the second difference. In some preferred embodiments, the first difference can be less than or equal to 1 mm, and the second difference can be less than or equal to 2 mm, but is not limited thereto and can be other values, which are not limited herein.

[0044] Reference Figure 4 In some embodiments, the second and fourth circular arcs 12 and 14 are arranged symmetrically about the first axis MN, wherein the first axis MN passes through the first point O and bisects the first and third circular arcs 11 and 13. In actual working conditions, the first axis MN can extend in the vertical direction and pass through the first point O, and the second and fourth circular arcs 12 and 14 are symmetric about the first axis MN and are not central symmetric about the first point O.

[0045] Continuing to refer to Figure 4In some embodiments, the central angle of the first arc 11 corresponding to the first point O is the first central angle θa, the central angle of the second arc 12 corresponding to the first point O is the second central angle θb, the central angle of the third arc 13 corresponding to the first point O is the third central angle θc, and the central angle of the fourth arc 14 corresponding to the first point O is the fourth central angle θd; wherein, the first central angle θa is less than the third central angle θc, the second central angle θb is equal to the fourth central angle θd, and the second central angle θb is greater than the third central angle θc.

[0046] In some more specific embodiments, the first central angle θa can be less than or equal to 60°, such as 60°, 50°, 45°, 40°, 30°, 20°, etc., and of course, it can also be other degrees; the third central angle θc can be less than or equal to 120°, such as 120°, 100°, 90°, 70°, etc., and of course, it can also be other degrees.

[0047] In some more specific embodiments, the crosshead structure 01 can be a columnar structure with an oval cross-section, that is, an oval columnar structure.

[0048] Optionally, the crosshead structure 01 may have skirts at both ends along its own axial direction. For example, the upper and lower edges at both ends of the crosshead body 10 may have skirts; of course, the crosshead body 10 may also have complete annular skirts arranged circumferentially around the crosshead body 10 at both ends.

[0049] Optionally, the skirt and the crosshead body 10 can be an integral structure or separate structures, and can be fixedly connected.

[0050] Furthermore, such as Figure 5 and Figure 6 As shown, the skirt can be chamfered towards the axis. Specifically, the outer walls at both ends of the crosshead body 10 can be provided with a first transition surface 21 and a second transition surface 22, respectively. The first transition surface 21 extends obliquely towards the axis of the crosshead structure 01 from the middle to one end, and the second transition surface 22 extends obliquely towards the axis of the crosshead structure 01 from the middle to the other end. Based on this, chamfered skirts can be formed at both ends of the crosshead body 10 to facilitate the engagement of the crosshead structure 01 with the sliding sleeve 02, and effectively prevent the ends of the crosshead structure 01 from scratching the inner wall of the sliding sleeve 02.

[0051] Optionally, the angle at which the first transition surface 21 is inclined toward the axis can be less than or equal to 30°, for example, including 30°, 25°, 20°, 15°, 10°, 50°, etc. Of course, it can also be other degrees, which are not specifically limited here.

[0052] In some specific embodiments, the chamfer can be a wedge-shaped chamfer. Based on this, during the movement of the crosshead structure 01, the gap between the wedge-shaped chamfer and the inner wall of the sliding sleeve 02 can better guide the lubricating oil into the contact area between the crosshead structure 01 and the sliding sleeve 02, so as to form an oil film; and the first transition surface 21 and the second transition surface 22 can each be smoothly transitioned with the outer wall of the crosshead body 10, so as to alleviate the stress concentration problem at the connection.

[0053] To achieve lubrication, the crosshead body 10 is provided with a first oil groove 31 at the outer wall corresponding to the first circular arc 11, as shown in the figure, the first oil groove 31 extends along the axial direction of the crosshead structure 01, so that the first oil groove 31 can receive and store lubricating oil, so as to have a good lubrication effect between the outer wall corresponding to the first circular arc 11 and the sliding sleeve 02. Figure 6

[0054] Further, the first oil groove 31 is located between the first transition surface 21 and the second transition surface 22, and along the axial direction of the crosshead structure 01, the length of the first oil groove 31 is less than the difference between the overall length of the crosshead body 10 minus the length of the first transition surface 21 and the length of the second transition surface 22, so that the lubricating oil in the first oil groove 31 cannot flow out from the first transition surface 21 or the second transition surface 22 to cause lubricating oil leakage.

[0055] Exemplarily, the difference between the overall length of the crosshead body 10 minus the length of the first transition surface 21 and the length of the second transition surface 22, and the length of the first oil groove 31 is less than or equal to 40 mm, so that a first sealing section (i.e., a section of the side wall of the crosshead body 10) can be formed between the first transition surface 21 and one end of the first oil groove 31, and a second sealing section (i.e., another section of the side wall of the crosshead body 10) can be formed between the second transition surface 22 and the other end of the first oil groove 31, so that the first oil groove 31 can be sealed at both ends by the first sealing section and the second sealing section respectively, to prevent lubricating oil from leaking from both ends of the first oil groove 31.

[0056] In addition, along the circumferential direction of the crosshead structure 01, the width of the first oil groove 31 is less than the arc length of the first circular arc 11. Based on this, the first oil groove 31 can be sealed at both ends in the circumferential direction to prevent lubricating oil from leaking in the circumferential direction.

[0057] Optionally, the bottom of the first oil groove 31 can be provided with an oil guide hole, which can be in communication with the internal space of the crosshead structure 01 (such as the groove 41 described below), and the lubricating oil in the first oil groove 31 can be guided to the internal space of the crosshead structure 01 through the oil guide hole, so as to lubricate the inside of the crosshead structure 01.

[0058] ​Correspondingly, the sliding sleeve 02 can be provided with an oil outlet hole, which can be correspondingly arranged with the first oil groove 31, so as to facilitate the delivery of lubricating oil into the first oil groove 31.

[0059] With reference to Figure 7 and Figure 8 In some embodiments, the cross head body 10 can be provided with a second oil groove 32 and a plurality of third oil grooves 33 at the outer wall corresponding to the third circular arc 13, wherein the second oil groove 32 extends along the axial direction of the cross head structure 01, the plurality of third oil grooves 33 respectively extend along the circumferential direction of the cross head structure 01, and the plurality of third oil grooves 33 respectively communicate with the second oil groove 32. Based on this arrangement, lubricating oil can be stored in the second oil groove 32 and the plurality of third oil grooves 33 respectively, so as to increase the storage amount of lubricating oil, and the lubricating area between the cross head structure 01 and the sliding sleeve 02 can be increased, thereby improving the lubricating effect.

[0060] Further, along the axial direction of the cross head structure 01, the length of the second oil groove 32 is less than the difference between the overall length of the cross head body 10 and the length of the first transition surface 21 and the length of the second transition surface 22. In this way, it can be ensured that the lubricating oil in the second oil groove 32 will not flow out from the first transition surface 21 or the second transition surface 22 to cause lubricating oil leakage.

[0061] Exemplarily, the difference between the overall length of the cross head body 10 and the length of the first transition surface 21 and the length of the second transition surface 22 is less than or equal to 40mm, and the difference between the overall length of the cross head body 10 and the length of the second oil groove 32 is less than or equal to 40mm. In this way, a third sealing section (i.e., a section of the side wall of the cross head body 10) can be formed between the first transition surface 21 and one end of the second oil groove 32, and a fourth sealing section (i.e., another section of the side wall of the cross head body 10) can be formed between the second transition surface 22 and the other end of the second oil groove 32. Thus, a seal can be formed at both ends of the second oil groove 32 through the first sealing section and the second sealing section respectively, so as to prevent lubricating oil from leaking from both ends of the second oil groove 32.

[0062] In addition, along the circumferential direction of the cross head structure 01, the width of the third oil groove 33 is less than the arc length of the third circular arc 13, i.e., the included angle of the third oil groove 33 is less than the third central angle θc. Based on this, it can be ensured that the third oil groove 33 forms a sealing section at both ends in the circumferential direction, so as to prevent lubricating oil from leaking in the circumferential direction. Optionally, the included angle of the third oil groove 33 can be less than 30°, for example, including 30°, 25°, 20°, 15°, 10°, 5°, etc.

[0063] Optionally, in the circumferential direction, the third oil groove 33 is symmetrically arranged with respect to the axis of the cross head structure 01.

[0064] Correspondingly, the sliding sleeve 02 can be provided with an oil outlet hole, which can be correspondingly arranged with the second oil groove 32, so that the lubricating oil in the second oil groove 32 and the third oil groove 33 can be discharged through the oil outlet hole.

[0065] In addition, the second oil groove 32 can also communicate with the internal space of the cross head body 10 (such as the following groove 41 and the like), so as to facilitate the circulation of the lubricating oil.

[0066] Based on the above arrangement, the lubricating oil in the second oil groove 32 and the plurality of third oil grooves 33 can guarantee the stable lubrication effect of the cross head structure 01 during movement, and since the gap between the second circular arc 12 and the fourth circular arc 14 and the sliding sleeve 02 is increased, the lubricating oil overflowing from the first oil groove 31, the second oil groove 32 and the third oil groove 33 can be better discharged from the gap between the second circular arc 12 and the fourth circular arc 14 and the sliding sleeve 02, reducing the dead zone range of the lubricating oil, improving the heat dissipation effect of the cross head structure 01 during movement, and further relieving the ablation problem.

[0067] Reference Figure 6 , Figure 9 and Figure 10 In some embodiments, the interior of the cross head body 10 can be provided with a groove 41, which can be connected with a connecting rod to drive the cross head structure 01 to move through the connecting rod. Optionally, the groove 41 can be semicircular, and the axis of the groove 41 is perpendicular to the first axis MN and perpendicular to the axis of the cross head structure 01.

[0068] Further, the interior of the cross head body 10 can also be provided with a first groove 42 and a second groove 43, which are respectively located at both ends of the groove 41 along the radial direction of the cross head structure 01, and the first groove 42 corresponds to the second circular arc 12, and the second groove 43 corresponds to the fourth circular arc 14.

[0069] Optionally, the first groove 42 and the second groove 43 can be arranged axially symmetrically about the first axis MN.

[0070] Further, as Figure 9 and Figure 10As shown, the first groove 42 and the second groove 43 are both arranged on the groove bottom of the tile groove 41, so that the surface of the tile groove 41 is divided into three sections by the first groove 42 and the second groove 43, and the radius of the first groove 42 and the radius of the second groove 43 are both greater than the radius of the tile groove 41. Based on this arrangement, the step structure of the groove bottom of the tile groove 41 is formed by arranging the first groove 42 and the second groove 43, so that the transition at the two ends in the radial direction is formed when the bearing bush contacts the groove bottom of the tile groove 41, so as to reduce the local stress concentration and weaken the stress concentration problem of the groove bottom of the tile groove 41. In addition, the first groove 42 and the second groove 43 can also make the lubricating oil in the tile groove 41 flow out, so as to alleviate the problem that the lubricating oil in the tile groove 41 is compressed or expanded to generate high pressure or vacuum, resulting in problems such as heating, cavitation and noise of the lubricating oil.

[0071] In some more specific embodiments, the depth of the first groove 42 and the second groove 43 is less than or equal to 2mm, that is, the difference between the radius of the first groove 42 and the second groove 43 and the radius of the tile groove 41 is less than or equal to 2mm, for example, including 2mm, 1.5mm, 1mm, 0.5mm, etc., of course, other values are also possible, which are not limited here.

[0072] Based on the above-mentioned crosshead structure 01, the application further discloses a fracturing pump, and the disclosed fracturing pump comprises the above-mentioned crosshead structure 01, wherein the fracturing pump can be a plunger pump.

[0073] The embodiments of the application are described above in combination with the drawings, but the application is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative but not limiting, and those skilled in the art can make many forms under the inspiration of the application without departing from the scope of the application and the protection scope of the claims.

Claims

1. A crosshead structure for a fracturing pump, characterized by, The crosshead body (10) comprises a first circular arc (11), a second circular arc (12), a third circular arc (13) and a fourth circular arc (14), which are sequentially arranged along the circumference of the crosshead structure (01) and form a multi-arc segment profile of the crosshead body (10) in the radial direction. The center of the first circular arc (11) and the center of the third circular arc (13) coincide at a first point (O), the distance from the first point (O) to each point on the first circular arc (11) is a first distance (La), the minimum distance from the first point (O) to each point on the second circular arc (12) is a second distance (Lb), the distance from the first point (O) to each point on the third circular arc (13) is a third distance (Lc), and the minimum distance from the first point (O) to each point on the fourth circular arc (14) is a fourth distance (Ld). The first distance (La) is greater than the third distance (Lc), the second distance (Lb) is equal to the fourth distance (Ld), and the second distance (Lb) is less than the third distance (Lc). The difference between the first distance (La) and the second distance (Lb) is a first difference, the difference between the first distance (La) and the third distance (Lc) is a second difference, and the first difference is greater than the second difference; wherein, The first difference is less than or equal to 1mm, and the second difference is less than or equal to 2mm.

2. The crosshead structure of claim 1, wherein The second circular arc (12) and the fourth circular arc (14) are arranged symmetrically about a first axis (MN); wherein, The first axis (MN) passes through the first point (O) and bisects the first circular arc (11) and the third circular arc (13).

3. The crosshead structure of claim 1, wherein The first circular arc (11) corresponds to a first central angle (θa) of the first point (O), the second circular arc (12) corresponds to a second central angle (θb) of the first point (O), the third circular arc (13) corresponds to a third central angle (θc) of the first point (O), and the fourth circular arc (14) corresponds to a fourth central angle (θd) of the first point (O). The first central angle (θa) is less than the third central angle (θc), the second central angle (θb) is equal to the fourth central angle (θd), and the second central angle (θb) is greater than the third central angle (θc).

4. The crosshead structure of claim 1, wherein The outer wall at both ends of the crosshead body (10) is respectively provided with a first transition surface (21) and a second transition surface (22), from the middle to one end of the crosshead structure (01), the first transition surface (21) extends obliquely to the axis direction of the crosshead structure (01), and from the middle to the other end of the crosshead structure (01), the second transition surface (22) extends obliquely to the axis direction of the crosshead structure (01). ​ 5. The crosshead structure of claim 1, wherein ​ 6. The crosshead structure of claim 5, wherein The cross head body (10) is provided with a first oil groove (31) extending along the axial direction of the cross head structure (01) at the outer wall corresponding to the first circular arc (11), and the first oil groove (31) is located between the first transition surface (21) and the second transition surface (22). The length of the first oil groove (31) along the axial direction of the cross head structure (01) is less than the difference between the overall length of the cross head body (10) and the lengths of the first transition surface (21) and the second transition surface (22). The width of the first oil groove (31) along the circumferential direction of the cross head structure (01) is less than the arc length of the first circular arc (11).

7. The crosshead structure of claim 5, wherein The cross head body (10) is provided with a second oil groove (32) extending along the axial direction of the cross head structure (01) and a plurality of third oil grooves (33) extending along the circumferential direction of the cross head structure (01) at the outer wall corresponding to the third circular arc (13), and the plurality of third oil grooves (33) are respectively in communication with the second oil groove (32). The length of the second oil groove (32) along the axial direction of the cross head structure (01) is less than the difference between the overall length of the cross head body (10) and the lengths of the first transition surface (21) and the second transition surface (22). The length of the third oil groove (33) along the circumferential direction of the cross head structure (01) is less than the arc length of the third circular arc (13).

8. The crosshead structure of claim 1, wherein The cross head body (10) is internally provided with a tile groove (41), a first recess (42) and a second recess (43). Along the radial direction of the cross head structure (01), the first recess (42) and the second recess (43) are respectively located at both ends of the tile groove (41), and the first recess (42) corresponds to the second circular arc (12) and the second recess (43) corresponds to the fourth circular arc (14).

9. The crosshead structure of claim 8, wherein, The first recess (42) and the second recess (43) are both formed in the groove bottom of the tile groove (41).

10. A fracturing pump characterized by, The cross head structure (01) comprises any one of claims 1 to 9.

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