Power end shell and plunger pump with same

Abstract

The invention relates to the technical field of oil and gas exploitation equipment, and discloses a power end shell and a plunger pump with the power end shell, the power end shell comprises a crankshaft box body and a crosshead box body, the crankshaft box body and the crosshead box body are of an integrated structure, a plurality of crankshaft bearing seats are arranged in the crankshaft box body, and a plurality of crankshaft bearing seats are arranged in the crosshead box body. Reinforcing ribs are connected between the crankshaft bearing seats and the inner wall of the crankshaft box body, and every two adjacent crankshaft bearing seats are connected through a supporting rib. According to the plunger pump, the bearing capacity of the power end shell can be effectively improved, the service life of the power end shell is prolonged, the oil leakage problem of the power end shell is effectively avoided, and the working performance of the plunger pump is improved.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas extraction equipment, and in particular to a power end housing and a plunger pump having the same. 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 structure of the plunger pump consists of a power end assembly and a hydraulic end assembly, among which the power end housing is the key component of the power end assembly of the plunger pump.

[0003] The existing power end housing is mainly formed by welding. As the oil field fracturing operation conditions develop towards high pressure and large displacement, the load of the plunger pump is also increased. The problem of low life of the power end housing weld is becoming increasingly prominent, affecting the load-bearing capacity and service life of the plunger pump. Summary of the invention

[0004] The present application aims to at least solve the technical problems in the prior art of low bearing capacity and short service life of the power end housing.

[0005] In order to solve the above technical problems, an embodiment of the present application provides a power end housing, wherein the power end housing comprises a crankcase and a crosshead housing, wherein the crankcase and the crosshead housing are an integrated structure.

[0006] The crankcase is provided with a plurality of crankshaft bearing seats, wherein reinforcing ribs are connected between the crankshaft bearing seats and the inner wall of the crankcase, and two adjacent crankshaft bearing seats are connected via supporting ribs.

[0007] In some embodiments, the reinforcing ribs are arranged on the outer periphery of the crankshaft bearing seat along the direction of maximum force during operation of the connecting rod crosshead.

[0008] In some embodiments, the power end housing includes a plurality of vertical plates arranged at intervals, a crankshaft mounting cavity is formed between the rear portions of two adjacent vertical plates, each vertical plate is provided with the crankshaft bearing seat, and the support seat is arranged on the vertical plate along the circumference of the crankshaft bearing seat.

[0009] In some embodiments, a crosshead mounting cavity is formed between the front portions of two adjacent vertical plates, a cylinder liner support seat is provided in the crosshead mounting cavity, and the crosshead cylinder liner is detachably installed in the crosshead mounting cavity and fixed to the cylinder liner support seat.

[0010] In some embodiments, the cylinder liner support seat includes a cylinder liner front support seat and a cylinder liner rear support seat respectively located at the front and rear sides of the crosshead mounting cavity.

[0011] The side wall of the crosshead mounting cavity is provided with a first limiting surface, and the side wall of the crosshead cylinder sleeve is provided with a second limiting surface matching the first limiting surface; the rear end of the crosshead mounting cavity is provided with a third limiting surface, and the end of the crosshead cylinder sleeve facing the crosshead mounting cavity is provided with a fourth limiting surface matching the third limiting surface.

[0012] In some embodiments, the crosshead cylinder sleeve is provided with a first oil return port and an oil return groove connected to the first oil return port; and / or

[0013] The crosshead cylinder sleeve is provided with a lubricating oil port; and / or

[0014] A guide portion is provided on the crosshead cylinder sleeve at one side facing the crosshead mounting cavity.

[0015] In some embodiments, a bearing outer ring baffle mounting boss is provided on the crankshaft bearing seat.

[0016] In some embodiments, the crankcase and the crosshead case are integrally formed by casting; and / or

[0017] The power end housing is provided with a bearing seat lubricating oil passage, a crosshead cylinder liner upper lubricating oil passage and a crosshead cylinder liner lower lubricating oil passage, and the bearing seat lubricating oil passage, the crosshead cylinder liner upper lubricating oil passage and the crosshead cylinder liner lower lubricating oil passage are integrally formed with the power end housing by casting.

[0018] In some embodiments, the top and bottom of the power end housing are respectively provided with an upper observation window and a lower observation window.

[0019] The upper observation window and the lower observation window are torque assembly ports; and / or

[0020] The lower observation window is installed with a lower observation window cover, and the lower observation window cover is an inward convex structure protruding toward the lower observation window.

[0021] The embodiment of the present application also provides a plunger pump having the above-mentioned power end housing.

[0022] The power end housing and the plunger pump having the same provided in the embodiment of the present application are achieved by setting the crankcase and the crosshead housing of the power end housing as an integrated structure, and arranging a plurality of crankshaft bearing seats at intervals in the crankcase, wherein reinforcing ribs are connected between the crankshaft bearing seats and the inner wall of the crankcase, and two adjacent crankshaft bearing seats are connected by supporting ribs, thereby effectively improving the load-bearing capacity of the power end housing, extending the service life of the power end housing, and effectively avoiding oil leakage problems of the power end housing, thereby improving the working performance of the plunger pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the power end housing of an embodiment of the present application;

[0025] Figure 2 A schematic diagram of the three-dimensional structure of the power end housing in another direction of the embodiment of the present application;

[0026] Figure 3 for Figure 1 A cross-sectional view of the middle power end housing;

[0027] Figure 4 A side view of a power end housing of an embodiment of the present application;

[0028] Figure 5 It is a schematic diagram of the assembly structure of the power end housing, the crankshaft assembly and the connecting rod crosshead assembly of the embodiment of the present application;

[0029] Figure 6 This is a schematic diagram of the assembly structure of the power end housing and its accessories of an embodiment of the present application;

[0030] Figure 7 It is a schematic diagram of the assembly structure of the power end housing and its accessories in another direction of the embodiment of the present application;

[0031] Figure 8 This is a schematic structural diagram of a power end housing and a crosshead cylinder sleeve according to an embodiment of the present application;

[0032] Fig. 9 for Figure 8 Enlarged cross-sectional view of the middle crosshead mounting cavity and crosshead cylinder sleeve ( Figure 8 The dotted box part);

[0033] Fig.10 This is a schematic structural diagram of a crosshead cylinder sleeve according to an embodiment of the present application;

[0034] Fig.11 It is a schematic structural diagram of the legs of the power end housing of an embodiment of the present application;

[0035] Fig.12 A cross-sectional view of a mounting boss for a baffle plate on an outer ring of a bearing according to an embodiment of the present application;

[0036] Fig.13 This is a structural schematic diagram of a bearing outer ring baffle mounting boss according to an embodiment of the present application;

[0037] Fig.14 A schematic diagram of applying torque to the connecting rod seat fixing bolt through the upper observation window in an embodiment of the present application;

[0038] Fig.15 A schematic diagram of applying torque to a connecting rod seat fixing bolt through a lower observation window according to an embodiment of the present application;

[0039] Fig.16 A cross-sectional view of a lower observation window of an embodiment of the present application;

[0040] Fig.17 This is a schematic structural diagram of a lower observation window cover according to an embodiment of the present application;

[0041] Fig.18 Another structural schematic diagram of the lower observation window cover of the embodiment of the present application.

[0042] Reference numerals:

[0043] 10-crankshaft housing, 101-crankshaft mounting cavity; 20-crosshead housing, 201-crosshead mounting cavity, 2011-first limiting surface, 2012-third limiting surface; 30-crankshaft assembly; 401-crosshead, 402-connecting rod;

[0044] 1-crankshaft bearing seat, 11-bearing outer ring baffle mounting boss, 12-crankshaft bearing seat end cover; 2-reinforcement ribs; 3-support ribs; 41-vertical plate, 42-upper cover plate, 43-lower cover plate, 44-front end plate, 441-connecting bolt hole, 442-hydraulic end connecting bolt, 443-front end plate reinforcement rib plate, 444-tie rod oil seal seat fixing hole, 45-rear cover plate; 5-cylinder liner support seat, 51-cylinder liner front support seat, 52-cylinder liner rear support seat; 6-crosshead cylinder liner, 61-second limit surface, 62-fourth limit surface, 63-crosshead cavity, 64-lubricating oil port, 65-first oil return port, 66-oil return groove, 67-guide; 71-bearing seat lubrication Oil passage, 72-lubricating oil passage on crosshead cylinder sleeve, 73-lubricating oil passage on crosshead cylinder sleeve; 81-upper observation window, 82-lower observation window, 83-upper observation window cover, 84-lower observation window cover, 841-inner convex structure, 842-fixed flange surface, 843-lower cover fixing hole, 844-top screw hole, 845-sealing groove, 846-recessed structure, 85-rear observation window, 86-rear observation window cover; 91-front outrigger, 911-front outrigger upper fixing hole, 912-front outrigger lower fixing hole, 92-rear outrigger, 93-front outrigger mounting hole, 94-lifting hole, 95-second oil return port, 96-oil receiving pan, 97-exhalation port, 971-air filter. DETAILED DESCRIPTION

[0045] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] Figures 1 to 18 The schematic diagram of the structure of the power end housing provided by the embodiment of the present application is shown. Figures 1 to 18As shown, an embodiment of the present application provides a power end housing for a plunger pump, the power end housing includes a crankcase 10 and a crosshead housing 20, the crankcase 10 and the crosshead housing 20 are an integrated structure, a plurality of crankshaft bearing seats 1 are arranged at intervals in the crankcase 10, reinforcing ribs 2 are connected between the crankshaft bearing seats 1 and the inner wall of the crankcase 10, and two adjacent crankshaft bearing seats 1 are connected by supporting ribs 3.

[0054] like Figure 4 and Figure 5 As shown, a crankshaft assembly 30 is installed in the crankcase 10, and a crosshead 401 in the connecting rod crosshead assembly is installed in the crosshead case 20. One end of the connecting rod 402 in the connecting rod crosshead assembly is located in the crosshead case 20 and connected to the crosshead 401, and the other end (big end) of the connecting rod 402 is located in the crankcase 10 and connected to the crankshaft assembly 30. The power end housing, the crankshaft assembly 30 and the connecting rod crosshead assembly together constitute the power end assembly of the plunger pump. The plunger pump also includes a reduction mechanism assembly and a hydraulic end assembly. The driving flange in the reduction mechanism assembly is connected to an external power source. The external power source drives the gear pair in the reduction mechanism assembly to rotate through the driving flange, thereby driving the connecting rod crosshead assembly to reciprocate, and then driving the plunger in the hydraulic end assembly to reciprocate. The reciprocating motion of the plunger can realize the change of the working volume of the valve box in the hydraulic end assembly and the switch of the valve assembly, thereby realizing the pumping of high-pressure liquid.

[0055] The crankcase 10 and the crosshead case 20 are an integrally formed one-piece structure, that is, the power end housing is an integral structure, which can improve the overall load-bearing reliability of the power end housing, and can effectively solve the problem of poor sealing of the contact surface between the crankcase 10 and the crosshead case 20 when the crankcase 10 and the crosshead case 20 are split structures, resulting in oil leakage from the housing.

[0056] The crankshaft bearing seat 1 is fixed in the crankcase 10, and is used to assemble the crankshaft bearing and bear the high-strength load applied by the crankshaft bearing. In order to ensure that the deformation of the crankshaft bearing seat 1 is within the required range when the crankshaft bearing seat 1 bears the high-strength load, the crankshaft bearing seat 1 is connected to the inner wall of the crankcase 10 through the reinforcing ribs 2 to better withstand the high-strength load applied to the crankshaft bearing seat 1 during the operation of the plunger pump, reduce the stress deformation of the crankshaft bearing seat 1, and improve the bearing capacity of the entire power end housing. At the same time, multiple crankshaft bearing seats 1 are arranged at intervals along the axis of the crankshaft, and adjacent crankshaft bearing seats 1 are connected by support ribs 3, which can further improve the bearing capacity of the crankshaft bearing seat 1 and reduce the stress deformation of the crankshaft bearing seat 1.

[0057] There may be multiple supporting ribs 3 between adjacent crankshaft bearing seats 1, and the supporting ribs 3 may be arranged at key supporting positions of the crankshaft bearing seat 1 to effectively improve the bearing capacity of the crankshaft bearing seat 1. Multiple reinforcing ribs 2 may be arranged along the circumferential direction of the crankshaft bearing seat 1.

[0058] A power end housing provided in an embodiment of the present application is achieved by setting the crankcase 10 and the crosshead housing 20 of the power end housing as an integrated structure, and arranging a plurality of crankshaft bearing seats 1 at intervals in the crankcase 10, wherein a reinforcing rib 2 is connected between the crankshaft bearing seat 1 and the inner wall of the crankcase 10, and two adjacent crankshaft bearing seats 1 are connected by supporting ribs 3, thereby effectively improving the load-bearing capacity of the power end housing, extending the service life of the power end housing, and effectively avoiding oil leakage problems of the power end housing, thereby improving the working performance of the plunger pump.

[0059] In some embodiments, Figure 5 As shown, the reinforcing rib 2 is along the maximum force direction of the connecting rod crosshead during operation ( Figure 5 The middle dotted line) is arranged on the outer periphery of the crankshaft bearing seat 1 and is respectively connected to the crankshaft bearing seat 1 and the inner wall of the crankcase 10, which can strengthen the high-strength stress-bearing position on the crankshaft bearing seat 1 to ensure the bearing capacity of the crankshaft bearing seat 1.

[0060] In some embodiments, Figures 1 to 5 As shown, the power end housing 1 includes a plurality of vertical plates 41 arranged at intervals, and a crankshaft mounting cavity 101 and a crosshead mounting cavity 201 are formed between two adjacent vertical plates 41. The crankshaft bearing seat 1 is provided on each of the vertical plates 41, and the reinforcing ribs 2 are arranged on the vertical plates 41 along the circumference of the crankshaft bearing seat.

[0061] The rear parts of the plurality of vertical plates 41 are the crankcase 10 part, and the front parts of the plurality of vertical plates 41 are the crosshead case 20 part. A crosshead mounting cavity 201 is formed between the front parts of two adjacent vertical plates 41. The crosshead 401 is installed in the crosshead mounting cavity 201 and is connected to the plunger of the hydraulic end. A crankshaft mounting cavity 101 is formed between the rear parts of two adjacent vertical plates 41. The crankshaft bearing seat 1 and the reinforcement rib 2 are integrally formed on the vertical plate 41. The crankshaft bearing seat 1 can be supported by the vertical plate 41, and the overall load-bearing reliability of the crankcase 10 can be ensured by the reinforcement rib 2.

[0062] It can be understood that, in this embodiment, the front portion refers to a side of the power end housing close to the hydraulic end assembly, and the rear portion refers to a side of the power end housing away from the hydraulic end assembly.

[0063] In some embodiments, a cylinder liner support seat 5 is provided in the crosshead installation cavity 201 , and the crosshead cylinder liner 6 is detachably installed in the crosshead installation cavity 201 and fixed to the cylinder liner support seat 5 .

[0064] In some embodiments, Figure 3 , Figures 8 to 10 As shown, the cylinder liner support seat 5 includes a cylinder liner front support seat 51 and a cylinder liner rear support seat 52 respectively located on the front and rear sides of the crosshead mounting cavity 201, the side wall of the crosshead mounting cavity 201 is provided with a first limiting surface 2011, and the side wall of the crosshead cylinder liner 6 is provided with a second limiting surface 61 matching the first limiting surface 2011; the rear end of the crosshead mounting cavity 201 is provided with a third limiting surface 2012, and the end of the crosshead cylinder liner 6 facing the crosshead mounting cavity 201 is provided with a fourth limiting surface 62 matching the third limiting surface 2012.

[0065] The first limiting surface 2011 of the side wall of the crosshead installation cavity 201 can cooperate with the second limiting surface 61 of the outer wall of the crosshead cylinder sleeve 6 to limit the crosshead cylinder sleeve 6 in the circumferential direction. The first limiting surface 2011 and the second limiting surface are preferably planes, which facilitate assembly while limiting. The third limiting surface 2012 at the rear end of the crosshead installation cavity 201 can cooperate with the fourth limiting surface 62 at the rear end of the crosshead cylinder sleeve 6 to limit the crosshead cylinder sleeve 6 in the axial direction, ensuring that the crosshead cylinder sleeve 6 is reliably fixed in the crosshead installation cavity 201.

[0066] like Fig.10 As shown, the crosshead cylinder sleeve 6 is provided with a through crosshead cavity 63 along its axial direction, and the crosshead is installed in the crosshead cavity 63. The crosshead cavity 63 is used to cooperate with the crosshead to withstand the reciprocating motion of the crosshead.

[0067] The crosshead cavity 63 is a complete cylindrical structure. Compared with the slide rail structure crosshead cavity used in the 5000hp and 7000hp plunger pumps in the industry, the cylindrical structure is complete and continuous, which can effectively prevent the lubricating oil from flowing out and ensure the amount of lubricating oil at the crosshead position.

[0068] In some embodiments, Fig.10 As shown, the crosshead cylinder sleeve 6 is provided with a lubricating oil port 64. The lubricating oil port 64 is used to transport the lubricating oil of the lubricating pipeline to the inner circle of the crosshead cylinder sleeve 6 to lubricate the crosshead and other structures.

[0069] In some embodiments, Fig.10As shown, the crosshead cylinder sleeve 6 is provided with a first oil return port 65 and an oil return groove 66 connected to the first oil return port 65. The first oil return port 65 is used to return the lubricating oil in the inner circle of the crosshead cylinder sleeve 6. The oil return groove 66 is arranged on the side of the crosshead cylinder sleeve 6 along the circumference of the crosshead cylinder sleeve 6, and can connect the upper and lower positions of the crosshead cylinder sleeve 6, and is used to return the lubricating oil retained on the crosshead cylinder sleeve 6.

[0070] In some embodiments, Fig.10 As shown, a guide portion 67 is provided on the crosshead cylinder sleeve 6 on one side facing the crosshead mounting cavity 201. The guide portion 67 is a guide angle or a guide slope, etc., which can better introduce the crosshead cylinder sleeve 6 into the crosshead mounting cavity 201 when the crosshead cylinder sleeve 6 and the crosshead mounting cavity 201 are assembled, and then the crosshead cylinder sleeve 6 is pressed into the crosshead mounting cavity 201 as a whole and embedded on the cylinder sleeve support seat 5.

[0071] In some embodiments, Fig.12 and Fig.13 As shown, the crankshaft bearing seat 1 is provided with a bearing outer ring baffle mounting boss 11.

[0072] The bearing outer ring baffle mounting boss 11 can reduce the width of the crankshaft bearing seat 1, and set the width of the crankshaft bearing seat 1 to be the same as the width of the crankshaft bearing, so as to realize the lightweight design of the crankshaft bearing. When designing the crankshaft bearing seat structure, a certain amount of processing will be reserved for the crankshaft bearing seat during welding or casting, and the position of the crankshaft bearing outer ring fixing ring will be partially processed during the fine processing process to ensure that the distance between the crankshaft bearing rings is consistent with the crankshaft bearing outer ring width value to meet the assembly requirements of the crankshaft bearing rings. That is, the traditional crankshaft bearing seat structure design will reserve a certain margin in the width direction of the crankshaft bearing seat, resulting in the entire crankcase 10 not meeting the lightweight design requirements. Therefore, in the structural design of the crankshaft bearing seat 1 of the present application, the width of the crankshaft bearing seat 1 is designed to be consistent with the width of the crankshaft bearing, without leaving any processing allowance, and a bearing outer ring baffle mounting boss 11 is locally designed at the position where the crankshaft bearing retaining ring needs to be assembled. During machining, the bearing outer ring baffle mounting boss 11 is further machined to ensure that the distance between the bearing outer ring baffle mounting bosses 11 is consistent with the width value of the crankshaft bearing outer ring to meet the assembly requirements of the crankshaft bearing retaining ring. In the present application, no allowance is reserved in the width direction of the crankshaft bearing seat 1 to meet the lightweight design requirements.

[0073] In some embodiments, the crankcase 10 and the crosshead case 20 are integrally formed by casting, which can effectively eliminate the problem of welding cracks that are easy to occur due to poor weld bearing capacity in the current power end housing, thereby improving the bearing capacity and service life of the power end housing. In addition, the structure of combining the crankcase 10 and the crosshead case 20 into one body through casting makes the overall structure of the power end housing more compact, realizing a lightweight design of the power end housing.

[0074] In some embodiments, Figure 3 As shown, a bearing seat lubricating oil passage 71, a crosshead cylinder liner upper lubricating oil passage 72 and a crosshead cylinder liner lower lubricating oil passage 73 are provided in the power end housing, and the bearing seat lubricating oil passage 71, the crosshead cylinder liner upper lubricating oil passage 72 and the crosshead cylinder liner lower lubricating oil passage 73 are integrally formed with the power end housing by casting.

[0075] The bearing seat lubricating oil passage 71, the crosshead cylinder sleeve upper lubricating oil passage 72 and the crosshead cylinder sleeve lower lubricating oil passage 73 are integrated inside the power end housing to lubricate the upper and lower positions of the crankshaft bearing seat 1 and the crosshead cylinder sleeve 6. Compared with the traditional plunger pump structure in which the main oil pipe is separately designed in the lubrication system, the lubricating pipeline is integrated in the housing, and the operation of the lubricating pipeline is more reliable and the structural assembly is simpler. In addition, the lubricating oil passage and the casting housing are integrally formed by casting, which can further reduce the weight of the power end housing and achieve lightweighting of the power end housing.

[0076] In some embodiments, Figures 1 to 3 , Fig.14 and Fig.15 As shown, an upper observation window 81 and a lower observation window 82 are respectively provided at the top and the bottom of the power end housing, and the upper observation window 81 and the lower observation window 82 are torque assembly holes.

[0077] like Figures 1 to 3 As shown, the power end housing also includes an upper cover plate 42, a lower cover plate 43, a front end plate 44 and a rear cover plate 45 which are arranged on the upper side, the lower side, the front end and the rear end of the plurality of vertical plates 41. The upper cover plate 42, the lower cover plate 43, the front end plate 44, the rear cover plate 45, and the vertical plate 41 located on the outermost side form an outer shell of the power end housing.

[0078] like Fig.14 As shown, the upper observation window 81 is arranged on the upper cover plate 42 and is directly opposite to the connecting rod seat fixing bolt assembly position and the cross head cylinder liner lubricating oil pipe assembly position; Fig.15 As shown, the lower observation window 82 is arranged on the lower cover plate 43 and is directly opposite to the connecting rod seat fixing bolt assembly position and the cross head cylinder liner lubricating oil pipe assembly position.

[0079] On the one hand, the upper observation window 81 and the lower observation window 82 can realize the installation of the lubricating oil pipe at the position of the crosshead cylinder sleeve 6. On the other hand, the upper observation window 81 and the lower observation window 82 can be used as torque assembly holes to apply the required torque value to the fixing bolts between the connecting rod seat and the connecting rod body, effectively solving the pain point of the inability to drive torque between the connecting rod seat and the connecting rod body due to limited assembly space in plunger pumps such as 2500hp and 2800hp.

[0080] like Figure 3 , Figure 6 and Figure 7 As shown, a connecting bolt hole 441 connected to the hydraulic end assembly is opened on the end surface of the front end plate 44, which is used to connect the power end housing to the hydraulic end assembly through the hydraulic end connecting bolt 442, and the high pressure load of the hydraulic end assembly is transmitted to the front end plate 44 through the hydraulic end connecting bolt 442.

[0081] To ensure that the front end plate 44 can withstand high-strength loads, the wall thickness of the front end plate 44 is greater than 50 mm.

[0082] Optional, such as Figure 3 As shown, a front end plate reinforcing rib plate 443 is provided at the rear of the front end plate 44 to enhance the bearing capacity of the front end plate 44 .

[0083] A tie rod oil seal seat fixing hole 444 is also provided on the end surface of the front end plate 44 for connecting with the tie rod oil seal assembly to achieve sealing cooperation between the tie rod oil seal and the tie rod.

[0084] In some embodiments, Figures 16 to 18 As shown, the upper observation window 81 is installed with an upper observation window cover 83 , and the lower observation window 82 is installed with a lower observation window cover 84 . The lower observation window cover 84 is an inwardly convex structure 841 protruding toward the lower observation window 82 .

[0085] The lower observation window cover 84 is designed as an inner convex structure 841 that bulges toward the lower observation window 82, and the convex end surface is flush with the inner end surface of the power end housing, which can eliminate the problem of lubricating oil accumulation during operation at the lower observation window position. The inner convex structure 841 can also form a concave structure 846 outside the lower observation window cover 84, reducing the weight of the lower observation window cover 84 and meeting the lightweight design requirements.

[0086] like Fig.17 and Fig.18As shown, the lower observation window cover 84 includes a fixed flange surface 842, and the fixed flange surface 842 is provided with a fixing hole 843 and a top screw hole 844. The lower observation window cover 84 is fixed to the power end housing by bolts matched with the lower cover fixing hole 843, and the top screw hole 844 is used to remove the lower observation window cover 84. A sealing groove 845 for assembling a sealing strip is provided at the connection between the inner convex structure 841 and the fixed flange surface 842 to achieve sealing between the lower observation window cover 84 and the power end housing.

[0087] like Figure 2 As shown, the rear end of the power end housing is provided with a rear observation window 85 (arranged on the rear cover plate 45) for installation of materials such as the connecting rod seat and daily maintenance. Figure 6 As shown, a rear observation window cover 86 is provided on the rear observation window 85 .

[0088] Similar to the structure of the lower observation window cover 84 , the upper observation window cover 83 and the rear observation window cover 86 also include a fixing flange surface 842 , a cover fixing hole and a top screw hole 844 to facilitate the installation of the upper observation window cover 83 and the rear observation window cover 86 .

[0089] like Figure 7 As shown, a crankshaft bearing seat end cover 12 is provided on the power end housing to protect the crankshaft mounting cavity 101.

[0090] In some embodiments, legs are provided around the bottom of the power end housing, and the legs include a front leg 91 and a rear leg 92. The front leg 91 is detachably mounted on the bottom of the power end housing by fasteners, and a front leg lower fixing hole 912 connected to the large pump base is provided at the bottom of the front leg 91.

[0091] The front leg 91 is a split structure. The front leg 91 structure is separated from the power end structure and designed separately, which can simplify the structural design of the power end shell and make the molding of the power end shell easier.

[0092] like Fig.11 As shown, the bottom of the power end housing is provided with a front leg mounting hole 93, the top of the front leg 91 is provided with a front leg upper fixing hole 911, the fixing bolt passes through the front leg mounting hole 93 and the front leg upper fixing hole 911 to connect the front leg 91 with the power end housing, and the bottom of the front leg 91 is provided with a front leg lower fixing hole 912 to connect with the large pump base. The rear leg 92 and the power end housing are still integrally formed.

[0093] In some embodiments, Figure 1 As shown, a lifting hole 94 is provided on the top of the power end housing.

[0094] In this embodiment, two lifting holes 94 are designed on the front and back of the power end housing, for a total of four lifting holes 94. On the one hand, they can be assembled together with the lifting equipment to realize the lifting and transportation of the power end housing; on the other hand, the four lifting holes 94 can be used to connect with the upper equipment of the whole machine for the installation of the upper equipment of the whole machine. Compared with the traditional grinding and welding method, the production efficiency of the whole machine is improved.

[0095] In some embodiments, Figure 7 and Fig.11 As shown, a plurality of second oil return ports 95 are provided at the bottom of the power end housing, and an oil receiving pan 96 is provided below the second oil return ports 95 .

[0096] The second oil return port 95 is used to collect and return the lubricating oil of the power end assembly. Each second oil return port 95 corresponds to a cylinder. For example, in this embodiment, 5 second oil return ports 95 are provided. A second oil return port 95 (sub-oil return port) is designed under each cylinder of the power end housing, which improves the oil return efficiency of the lubricating oil of the power end. An oil receiving pan 96 is designed under the multiple second oil return ports 95 to collect and return the lubricating oil at the position of the second oil return port 95.

[0097] The second oil return port 95 is preferably a slot structure. The oil return port of the slot structure can be fixed together with the oil return pipeline of the whole machine by a clamp. It has a simple, reliable and easy operation. Compared with the traditional oil return port of the power end housing with a threaded structure, the oil return pipe of the whole machine needs to be screwed into the threaded hole of the oil return port. At the same time, in order to prevent the oil return pipeline and the oil return port from loosening and oil leakage during operation, the oil return pipeline will be screwed into the inner mouth of the threaded hole of the oil return port, and then the oil return pipe will be welded to the oil return port. The slot-shaped oil return port structure of the present application has a simpler structure, is more convenient to operate, and has more reliable performance.

[0098] In some embodiments, Figure 1 , Figure 3 and Figure 6 As shown, an exhalation port 97 is provided at the top of the power end housing, which is used to be installed together with the air valve to realize ventilation between the power end housing and the outside world, and prevent the enclosed space inside the power end housing from being in a closed state, resulting in abnormalities such as increased internal pressure. The exhalation port 97 can also be installed with an air filter 971 to achieve purification inside the power end housing.

[0099] In summary, the embodiment of the present application realizes a lightweight design of the power end housing by structurally designing the power end housing of the plunger pump while meeting the load-bearing capacity of the power end housing, thereby meeting the high reliability and lightweight design requirements of the plunger pump product and improving the performance of the plunger pump product.

[0100] The embodiment of the present application also provides a plunger pump having the above-mentioned power end housing. The plunger pump corresponds to the power end housing of the above-mentioned embodiment. Any optional items in the power end housing embodiment are also applicable to the embodiment of the plunger pump, which will not be repeated here.

[0101] 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.

[0102] 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.

[0103] 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 power end housing, characterized in that: The power end housing includes a crankcase and a crosshead housing, and the crankcase and the crosshead housing are an integrated structure. The crankcase is provided with a plurality of crankshaft bearing seats, wherein reinforcing ribs are connected between the crankshaft bearing seats and the inner wall of the crankcase, and two adjacent crankshaft bearing seats are connected via supporting ribs.

2. The power end housing according to claim 1, characterized in that: The reinforcing ribs are arranged on the outer periphery of the crankshaft bearing seat along the direction of maximum force in the operation of the connecting rod crosshead.

3. The power end housing according to claim 1, characterized in that: The power end housing includes a plurality of vertical plates arranged at intervals, a crankshaft installation cavity is formed between the rear parts of two adjacent vertical plates, each of the vertical plates is provided with the crankshaft bearing seat, and the support seat is arranged on the vertical plate along the circumference of the crankshaft bearing seat.

4. The power end housing according to claim 3, characterized in that: A crosshead mounting cavity is formed between the front parts of two adjacent vertical plates, a cylinder sleeve support seat is arranged in the crosshead mounting cavity, and the crosshead cylinder sleeve is detachably mounted in the crosshead mounting cavity and fixed to the cylinder sleeve support seat.

5. The power end housing according to claim 4, characterized in that: The cylinder liner support seat comprises a cylinder liner front support seat and a cylinder liner rear support seat respectively located at the front and rear sides of the crosshead mounting cavity. The side wall of the crosshead mounting cavity is provided with a first limiting surface, and the side wall of the crosshead cylinder sleeve is provided with a second limiting surface matching the first limiting surface; the rear end of the crosshead mounting cavity is provided with a third limiting surface, and the end of the crosshead cylinder sleeve facing the crosshead mounting cavity is provided with a fourth limiting surface matching the third limiting surface.

6. The power end housing according to claim 5, characterized in that: The crosshead cylinder sleeve is provided with a first oil return port and an oil return groove connected to the first oil return port; and / or The crosshead cylinder sleeve is provided with a lubricating oil port; and / or A guide portion is provided on the crosshead cylinder sleeve at one side facing the crosshead mounting cavity.

7. The power end housing according to claim 1, characterized in that: The crankshaft bearing seat is provided with a bearing outer ring baffle mounting boss.

8. The power end housing according to claim 1, characterized in that: The crankcase and the crosshead case are integrally formed by casting; and / or The power end housing is provided with a bearing seat lubricating oil passage, a crosshead cylinder liner upper lubricating oil passage and a crosshead cylinder liner lower lubricating oil passage, and the bearing seat lubricating oil passage, the crosshead cylinder liner upper lubricating oil passage and the crosshead cylinder liner lower lubricating oil passage are integrally formed with the power end housing by casting.

9. The power end housing according to claim 1, characterized in that: The top and bottom of the power end housing are respectively provided with an upper observation window and a lower observation window. The upper observation window and the lower observation window are torque assembly ports; and / or The lower observation window is installed with a lower observation window cover, and the lower observation window cover is an inward convex structure protruding toward the lower observation window.

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

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