Plunger pump power end shell and plunger pump

Abstract

The utility model provides a plunger pump power end shell and plunger pump relates to plunger pump technical field, plunger pump power end shell includes the shell, be equipped with a plurality of mutually parallel vertical plate inside the shell, be equipped with the crankshaft bearing seat on the vertical plate, be equipped with the first mounting hole that is used for mounting crankshaft assembly on the crankshaft bearing seat, be equipped with the crankshaft assembly on the crankshaft bearing seat, be equipped with the crankshaft assembly on the crankshaft bearing seat. A crosshead is further arranged in the shell, and the axis of the crosshead and the axis of the crankshaft assembly are located on different planes. The plunger pump power end shell can be designed to be more compact, the design requirement for light weight is met, and the power output of plunger pump products can be improved. The crankshaft bearing seat is of an eccentric structure, the first mounting hole is eccentrically formed in the direction facing the cylinder sleeve relative to the second mounting hole of the vertical plate, and compared with a traditional crankshaft bearing seat of a concentric structure, the crankshaft bearing seat is better in structural design bearing performance, longer in service life and more reasonable in design.

Description

TECHNICAL FIELD

[0001] The utility model embodiment relates to the technical field of plunger pump, specifically, relate to a plunger pump power end casing and plunger pump. BACKGROUND

[0002] With the development of the working condition of oilfield exploitation operation to high pressure, large displacement, the operation capacity of fracturing equipment used in oilfield exploitation is increasingly improved, the weight overload problem of the fracturing equipment and cementing equipment used in the current oilfield exploitation is increasingly highlighted, even the weight exceeds the requirement of road regulations, which brings inconvenience to the normal use of customers, the weight overload problem of the whole machine equipment is increasingly prominent in recent years, and it is urgent to solve.

[0003] At present, the fracturing condition develops towards high pressure and large displacement, and the problem of overweight of fracturing equipment is increasingly prominent, the plunger pump product with strong bearing capacity and light weight is demanded by customers at present and in the future, and it is also the future development trend of plunger pump. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the problem of large weight and weak bearing capacity of the plunger pump in the prior art, the utility model embodiment provides a plunger pump power end casing and plunger pump.

[0005] Therefore, one aspect of the utility model provides a plunger pump power end casing, which comprises a shell, a plurality of vertical plates parallel to each other are arranged in the shell, a crankshaft bearing seat is arranged on the vertical plate, a first mounting hole for mounting a crankshaft assembly is arranged on the crankshaft bearing seat, a cross head is further arranged in the shell, and the axis of the cross head and the axis of the crankshaft assembly are located in different planes.

[0006] The utility model discloses another aspect of a plunger pump power end casing, which comprises a shell, a plurality of vertical plates parallel to each other are arranged in the shell, a crankshaft bearing seat is arranged on the vertical plate, a first mounting hole for mounting a crankshaft assembly is arranged on the crankshaft bearing seat, a second mounting hole for mounting the crankshaft bearing seat is arranged on the vertical plate, and the first mounting hole is eccentrically arranged relative to the second mounting hole.

[0007] In some embodiments, one side of the crankshaft assembly is provided with a cylinder sleeve for mounting a cross head, and the first mounting hole is eccentrically arranged relative to the second mounting hole in the direction of the cylinder sleeve.

[0008] In some embodiments, a groove is formed on the inner wall of the first mounting hole, and an oil channel hole is formed in the bottom of the groove.

[0009] In some embodiments, the groove is an arc structure.

[0010] In some embodiments, the shell comprises an upper cover plate and a lower cover plate, the upper cover plate comprises at least one upper cover plate unit, two sides of the upper cover plate unit are respectively welded with two adjacent stand plates, the lower cover plate comprises at least one lower cover plate unit, two sides of the lower cover plate unit are respectively welded with two adjacent stand plates.

[0011] In some embodiments, an end plate is connected to the end of the stand plate, the upper cover plate and the lower cover plate are respectively inserted with the upper end surface and the lower end surface of the end plate and are welded along the contact line of the insertion.

[0012] In some embodiments, an oil return port is arranged on the lower cover plate, and a clamping groove is arranged on the oil return port.

[0013] Another aspect of the utility model provides a plunger pump, including crank assembly, cross head, connecting rod and the plunger pump power end shell of any preceding item, one end of connecting rod is connected with crank assembly, the other end is connected with cross head.

[0014] In some embodiments, the connecting rod ratio parameter range is 0.19-0.25, and the connecting rod ratio is the ratio of the length of the connecting rod to the radius of the crank assembly.

[0015] The utility model embodiment has two characteristics of high bearing and light weight, and can better meet customer demand.

[0016] In order to make the above-mentioned purpose, features and advantages of the utility model embodiment more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0017] In the drawings that are not necessarily drawn to scale, like reference numerals can describe similar components throughout the various figures. Like reference numerals having different letter suffixes can represent different instances of the like components. The drawings illustrate generally, by way of example, various embodiments discussed herein, and are not intended to limit the disclosure to the embodiments depicted. The same or similar reference numerals can be used in all of the drawings to represent similar components. Such embodiments are illustrative, and not intended to be exhaustive or limiting of the present devices and methods. The drawings herein are intended to provide a further understanding that can be used to provide a construction of the present devices and methods and are not intended to provide an exclusive reference for the same. In the drawings:

[0018] Figure 1 The explosion view of the plunger pump power end shell provided by the utility model embodiment is provided.

[0019] Figure 2The structure schematic view of the plunger pump power end shell provided by the embodiment of the utility model;

[0020] Figure 3 The welding seam schematic view between the upper cover plate and the vertical plate of the plunger pump power end shell provided by the embodiment of the utility model;

[0021] Figure 4 The welding seam schematic view between the lower cover plate and the vertical plate of the plunger pump power end shell provided by the embodiment of the utility model;

[0022] Figure 5 The welding seam schematic view between the cylinder sleeve and the upper side position of the vertical plate of the plunger pump power end shell provided by the embodiment of the utility model;

[0023] Figure 6 The welding seam schematic view between the cylinder sleeve and the lower side position of the vertical plate of the plunger pump power end shell provided by the embodiment of the utility model;

[0024] Figure 7 The welding seam schematic view between the crankshaft bearing seat and the vertical plate position of the plunger pump power end shell provided by the embodiment of the utility model;

[0025] Figure 8 The welding seam schematic view between the front end plate and the upper cover plate position of the plunger pump power end shell provided by the embodiment of the utility model;

[0026] Figure 9 The welding seam schematic view between the front end plate and the cylinder sleeve position of the plunger pump power end shell provided by the embodiment of the utility model;

[0027] Figure 10 The structure schematic view of the plunger pump power end shell provided by the embodiment of the utility model;

[0028] Figure 11 The position relation schematic view of the axis of the first mounting hole of the crankshaft bearing seat and the crankshaft axis in the prior art;

[0029] Figure 12 The position relation schematic view of the axis of the first mounting hole of the crankshaft bearing seat and the crankshaft axis of the plunger pump power end shell provided by the embodiment of the utility model;

[0030] Figure 13 The eccentric structure schematic view of the crankshaft bearing seat of the plunger pump power end shell provided by the embodiment of the utility model;

[0031] Figure 14 The oil channel hole schematic view of the plunger pump power end shell provided by the embodiment of the utility model.

[0032] The above-mentioned drawings of the utility model comprise the following reference signs: Figures 1 to 14 The above-mentioned drawings of the utility model comprise the following reference signs:

[0033] 1 - upper cover plate; 1a - upper cover plate unit; 11 - first observation hole; 12 - second observation hole; 13 - convex part; 2 - vertical plate; 21 - mounting groove; 3 - cylinder jacket; 31 - crosshead cavity; 4 - front end plate; 41 - third mounting hole; 42 - second groove; 5 - reinforcing plate; 6 - support plate; 7 - base; 8 - lower cover plate; 8a - lower cover plate unit; 81 - third observation hole; 82 - oil return port; 821 - clamping groove; 9 - crankshaft bearing seat; 91 - first mounting hole; 92 - oil passage hole; 93 - first groove; 10 - rear cover plate; 110 - fourth observation hole; A1 - first weld; A2 - second weld; A3 - third weld; A4 - fourth weld; A5 - fifth weld; A6 - sixth weld; A7 - seventh weld. DETAILED DESCRIPTION

[0034] In the following, specific embodiments of the present application will be described in detail with reference to the accompanying drawings, but the present application is not limited by the embodiments.

[0035] It should be understood that various modifications can be made to the embodiments disclosed herein. Therefore, the above description should not be taken as limiting, but merely as exemplification of the embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the application.

[0036] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the general description of the application given above, and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0037] These and other characteristics of the present application will become apparent from the following description of the preferred forms given, by way of non-limiting example, with reference to the attached drawings.

[0038] It is also to be understood that even though a number of embodiments of the application have been described herein, the application covers all modifications and equivalents falling within the scope of the following claims.

[0039] The above and other aspects, features, and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:

[0040] The specific embodiments of the present application will be described hereinafter with reference to the drawings; however, it should be understood that the disclosed embodiments are merely examples of the present application, which can be implemented in various 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 disclosed herein are not intended to be limiting, but are merely presented as a basis and representative basis for the claims for teaching those skilled in the art to use the present application in a variety of essentially any suitable detailed structures.

[0041] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily 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 application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0042] The present specification can use the phrases "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments", which can all refer to one or more of the same or different embodiments according to the present application.

[0043] The first embodiment of the present application provides a plunger pump power end housing, which is arranged on a plunger pump, the plunger pump of the present embodiment comprising a crankshaft assembly, a connecting rod, a cross head and a plunger, the crankshaft assembly, the connecting rod and the cross head being installed in the plunger pump power end housing, one end of the connecting rod being connected to the crankshaft assembly, the other end of the connecting rod being connected to the cross head, the front end of the cross head being connected to the plunger, the rotation of the crankshaft assembly being able to drive the plunger to reciprocate, thereby realizing the liquid suction and discharge of the plunger pump.

[0044] As shown in Figure 1 and Figure 2 The plunger pump power end housing comprises an outer shell, a plurality of vertical plates 2 are arranged inside the outer shell and are parallel to each other, a crankshaft bearing seat 9 is installed on the vertical plate 2, and a first mounting hole 91 for mounting the crankshaft assembly is arranged on the crankshaft bearing seat 9; a cross head is also arranged inside the outer shell, and the axis B of the cross head and the axis C of the crankshaft assembly are located in different planes, as shown in Figure 12 ;

[0045] Further, in the embodiment, the side surface of the vertical plate 2 is provided with a cylinder sleeve 3 for mounting the cross head, the axis of the cylinder sleeve 3 is located in a different plane from the axis of the first mounting hole 91, as shown in Figure 12 .

[0046] In the embodiment, by arranging the axis B of the cross head and the axis B of the first mounting hole 91 in different planes, the limit distance of the cross head running to the front end can be shortened, so that the front end position of the plunger pump power end shell can be further compressed in the direction of the crankshaft, so as to reduce the size of the plunger pump power end shell in the width direction, so that the plunger pump power end shell can be designed more compactly, meeting the design requirements of lightweight.

[0047] In addition to the above advantages, as Figure 11 and Figure 12 shown, compared with the prior art, the center of the crankshaft of the traditional plunger pump and the center of the cross head are located in the same plane, that is, when the cross head of the plunger pump runs to the limit position farthest from the center of the crankshaft, the axes of the crankshaft, the connecting rod and the cross head are all in the same plane, when the crankshaft runs to this position, the force of the crankshaft, the connecting rod and the cross head is relatively difficult, this position is also called the dead point position, the utility model carries out the offset crankshaft structure design, that is, the axis B of the cross head and the axis of the first mounting hole 91 are arranged in different planes, so that during the operation of the crankshaft, the crankshaft, the connecting rod and the cross head will not run to a plane, eliminating the existence of the dead point position, thereby avoiding the risk of difficult force of the existence of the dead point position, improving the power output of the plunger pump product.

[0048] Further, the crankshaft bearing seat 9 is connected with the vertical plate 2, specifically, the crankshaft bearing seat 9 is connected with the vertical plate 2 by welding, forming a fifth welding seam A5, as shown in Figure 7 , the fifth welding seam A5 is a welding structure form of two side circumferential butt seams, the circumferential butt seam has large welding area, regular welding geometry and high welding strength, realizing the reliability of the welding seam force between the crankshaft bearing seat 9 and the vertical plate 2.

[0049] In the embodiment, since the load borne by the plunger pump power end mainly comes from the fluid end, the load applied by the fluid end to the crankshaft bearing seat 9 is a thrust force, and the main bearing position of the crankshaft bearing seat 9 is the rear part of the crankshaft bearing seat 9, in order to optimize the bearing capacity of the crankshaft bearing seat 9, the utility model designs the crankshaft bearing seat 9 as an eccentric structure, as shown in Figure 13As shown, the upright plate 2 is provided with a second mounting hole for mounting the crankshaft bearing seat 9, the first mounting hole 91 is eccentrically arranged relative to the second mounting hole, and when mounted, the first mounting hole 91 is arranged offset from the rear end of the upright plate 2, so that the rear part of the crankshaft bearing seat 9, which is the main load bearing position, has a relatively thick thickness, so that the force on the crankshaft bearing seat 9 is more reasonable. The eccentric structure of the crankshaft bearing seat 9 has better load bearing performance and longer service life than the traditional concentric structure of the crankshaft bearing seat, and the design is more reasonable.

[0050] Further, in the embodiment, the first mounting hole 91 is eccentrically arranged relative to the second mounting hole towards the direction of the cylinder sleeve 3.

[0051] In the embodiment, a first groove 93 is formed on the inner wall of the first mounting hole 91, and an oil channel hole 92 is formed at the bottom of the first groove 93 for lubrication of the crankshaft bearing, and the oil channel hole 92 penetrates the crankshaft bearing seat 9;

[0052] Specifically, as shown in the drawings, Figure 14 The first groove 93 is an arc structure, and preferably, the first groove 93 is a semicircular structure. Compared with the prior art, the oil channel hole of the crankshaft bearing seat of the traditional plunger pump power end shell is designed as a circular hole penetrating the wall surface of the crankshaft bearing seat. When the first mounting hole 9 of the crankshaft bearing seat is subsequently machined, the oil channel hole is discontinuous and not smooth during machining, and the cutting tool will have a stress mutation problem when machining at this position, which is prone to tool breakage abnormalities, and adversely affects the tool wear and machining quality of the product. The first groove 93 is designed at the oil channel hole 92 of the crankshaft bearing seat, and the first groove 93 is a semicircular structure. During the machining process, the cutting tool will be smoother when machining at this position, and will not produce a large stress mutation, thereby improving the service life of the cutting tool and the machining quality of the first mounting hole 91.

[0053] In the embodiment, the shell includes an upper cover plate 1 connected above the upright plate 2, and preferably, the upper cover plate 1 and the upright plate 2 are connected by welding to form a first weld A1, as shown in the drawings. Figure 3 Compared with the casting shell of the prior art, the lightweight design of the plunger pump power end shell can be realized;

[0054] Further, the upper cover plate 1 comprises a plurality of upper cover plate units 1a, which are arranged between adjacent vertical plates 2, and the two sides of the upper cover plate unit 1a are respectively welded to two adjacent vertical plates 2. On the one hand, the two vertical plates 2 can be positioned, and on the other hand, the welding seam between the upper cover plate unit 1a and the vertical plate 2 is arranged along the axis direction of the force applied by the hydraulic end, which belongs to the connecting welding seam form. The connecting welding seam is associated with the connected part and is parallel to the stress direction, is a welding seam for transmitting very small load, only transmits part of the load, has good bearing effect, and makes the plunger pump power end shell have good bearing performance.

[0055] In the embodiment, the shell comprises a lower cover plate 8 connected below the vertical plate 2. Preferably, the lower cover plate 8 is connected to the vertical plate 2 by welding, forming a second welding seam A2, as shown in Figure 4 Compared with the cast shell in the prior art, the plunger pump power end shell can be designed to be lightweight.

[0056] Further, the lower cover plate 8 comprises a plurality of lower cover plate units 8a arranged between adjacent vertical plates 2, and the two sides of the lower cover plate unit 8a are respectively welded to two adjacent vertical plates 2. On the one hand, the two vertical plates 2 can be positioned, and on the other hand, the welding seam between the lower cover plate unit 8a and the vertical plate 2 is arranged along the axis direction of the force applied by the hydraulic end, which belongs to the connecting welding seam form. The connecting welding seam is associated with the connected part and is parallel to the stress direction, is a welding seam for transmitting very small load, only transmits part of the load, has good bearing effect, and makes the plunger pump power end shell have good bearing performance.

[0057] In the embodiment, the shell comprises a rear cover plate 10 connected to the rear end of the vertical plate 2. Preferably, the rear cover plate 10 is connected to the vertical plate 2 by welding, which can realize the lightweight design of the plunger pump power end shell compared with the cast shell in the prior art.

[0058] In the embodiment, the side surface of the cylinder sleeve 3 is connected to the vertical plate 2. Preferably, the side surface of the cylinder sleeve 3 is connected to the vertical plate 2 by welding, forming a third welding seam A3 and a fourth welding seam A4, as shown in Figure 5 and Figure 6 Compared with the cast shell in the prior art, the plunger pump power end shell can be designed to be lightweight.

[0059] In the embodiment, the front end of the vertical plate 2 is connected with a front end plate 4, the front end plate 4 is provided with a third mounting hole 41, the cylinder sleeve 3 is arranged in the third mounting hole 41, and the third mounting hole 41 is matched with the shape of the cylinder sleeve 3; specifically, the vertical plate 2 is provided with a mounting groove 21, and the front end plate 4 is arranged in the mounting groove 21.

[0060] Further, the front end plate 4 and the upper cover plate 1 are connected through plug-in connection, specifically, the front end plate 4 and the upper cover plate 1 are connected through a swallow plate structure, more specifically, the front end plate 4 is provided with a second groove 42, the upper cover plate 1 is provided with a convex part 13 matched with the second groove 42, the convex part 13 is plug-in connected with the second groove 42 and is welded along the contact line of plug-in, thereby forming a sixth welding seam A6 between the front end plate 4 and the upper cover plate 1; or,

[0061] The upper cover plate 1 is provided with a second groove 42, the front end plate 4 is provided with a convex part 13 matched with the second groove 42, the convex part 13 is plug-in connected with the second groove 42 and is welded along the contact line of plug-in, thereby forming a sixth welding seam A6 between the front end plate 4 and the upper cover plate 1, as shown in Figure 8

[0062] Further, the front end plate 4 and the lower cover plate 8 are connected through plug-in connection, specifically, the front end plate 4 and the lower cover plate 8 are connected through a swallow plate structure, more specifically, the front end plate 4 is provided with a second groove 42, the lower cover plate 8 is provided with a convex part 13 matched with the second groove 42, the convex part 13 is plug-in connected with the second groove 42 and is welded along the contact line of plug-in, thereby forming a sixth welding seam A6 between the front end plate 4 and the lower cover plate 8; or,

[0063] The lower cover plate 8 is provided with a second groove 42, the front end plate 4 is provided with a convex part 13 matched with the second groove 42, the convex part 13 is plug-in connected with the second groove 42 and is welded along the contact line of plug-in, thereby forming a sixth welding seam A6 between the front end plate 4 and the lower cover plate 8.

[0064] ​In the embodiment, the convex part 13 and the second groove 42 are supported by the front end plate 4, the force of the sixth weld 16 can be reduced, the convex part 13 and the second groove 42 are welded to form five working welds, the load of a single working weld can be reduced; in addition, the convex part 13 and the second groove 42 connect the two side plates 2 and the front end plate 4 together, since the first weld A1 is designed between the upper cover plate 1 and the side plate 2 and the second weld A2 is designed between the lower cover plate 8 and the side plate 2, the side plate 2 can bear and disperse the force of the sixth weld A6, and the reliability of the weld between the front end plate 4, the upper cover plate 1 and the lower cover plate 8 can be realized.

[0065] In the embodiment, the front end plate 4 is provided below with a reinforcing plate 5, preferably, the reinforcing plate 5 is welded below the front end plate 4 and welded together with the plurality of side plates 2, which supports the front end plate 4 and strengthens the structure of the whole front end of the power end shell.

[0066] In the embodiment, the outer wall of the cylinder sleeve 3 is connected with the third mounting hole 41, specifically, the outer wall of the cylinder sleeve 3 is connected with the third mounting hole 41 in a welding mode to form a seventh weld A7, as shown in the figure, the seventh weld A7 belongs to a working weld, the weld structure is designed as a circumferential butt weld structure, the circumferential butt weld has a large welding area, a regular weld geometric shape and high welding strength, the reliability of the weld between the front end plate 4 and the cross head cylinder sleeve 3 can be realized, and the weld load capacity of the position can be enhanced. Figure 9

[0067] The plunger pump power end shell adopts a high-strength welding structure, and the welding welds are roughly divided into two weld forms, namely, a connecting weld and a working weld. The connecting weld is associated with a connected part, parallel to a force direction and transmitting a small load. The working weld is in series with a connecting element on a welding structure, bears the function of transmitting all loads and is broken, and the structure is immediately invalid. In the structure design of the welding weld, the connecting weld is mainly used in the shell structure design. The connecting weld can bear a small load, and the load bearing effect of the weld is good. In the key stress point and the position that cannot be designed as the connecting weld, a bird plate structure, a circumferential butt weld and other structures are designed to increase the load bearing capacity of the working weld and improve the reliability of the welding load bearing.

[0068] In order to realize the supporting effect on the rear end of the cylinder sleeve 3, in the embodiment, the rear end of the cylinder sleeve 3 is connected with a supporting plate 6, specifically, the supporting plate 6 includes an upper supporting plate and a lower supporting plate, the upper supporting plate is arranged above the cylinder sleeve 3, the lower supporting plate is arranged below the cylinder sleeve 3, and the upper supporting plate and the lower supporting plate are clamped and connected.

[0069] ​In the embodiment, the bottom of the plunger pump power shell is connected with a base 7, preferably, the base 7 is welded with the plunger pump power shell as a whole, and the base 7 is provided with a connecting hole for mounting the power end shell with the whole machine equipment, so as to realize the lightweight design of the plunger pump power shell.

[0070] In the embodiment, the upper cover plate 1 is provided with a first observation hole 11 for the installation of the lubricating oil pipe and providing assembly installation space when torque is applied between the fixing bolt and the nut on the upper edge between the connecting rod seat and the connecting rod body, and a second observation hole 12 for providing assembly installation space for the installation of the lubricating oil pipe.

[0071] In the embodiment, the cylinder sleeve 3 is internally provided with a cross head cavity 31 for supporting the cross head and the connecting rod assembly, so as to realize the reciprocating movement of the cross head and the connecting rod assembly in the cross head cavity 31.

[0072] As shown in the drawings, Figure 10 In the embodiment, the lower cover plate 8 is provided with a third observation hole 81 for the installation of the lubricating oil pipe and providing assembly installation space when torque is applied between the fixing bolt and the nut on the lower edge between the connecting rod seat and the connecting rod body, and an oil return port 82 for returning the lubricating oil of the power end assembly to the lubricating oil tank, so as to realize the circulation of the lubricating oil in the whole lubricating system.

[0073] Specifically, the oil return port 82 is an independent clamping groove structure, more specifically, the oil return port 82 is provided with a clamping groove 821, and the structure design of the oil return port 82 improves the oil return efficiency of the power end lubricating oil, improves the circulation efficiency of the lubricating oil, and improves the cooling efficiency of the lubricating oil. Good cooling effect can improve the lubrication effect of the whole plunger pump, and the oil return port of the power end shell is designed as a clamping groove structure, the clamping groove 821 can be fixed with the oil return pipeline of the whole machine through a clamp, which is simple, reliable and convenient to operate. Compared with the traditional oil return port of the power end shell which adopts a threaded structure, the oil return pipeline of the whole machine needs to be screwed into the threaded hole of the oil return port, and in order to prevent the oil return pipeline and the oil return port from loosening and leaking, the oil return pipeline and the oil return port are welded together. The clamping groove structure of the oil return port of the utility model is simpler in structure, more convenient to operate and more reliable in performance.

[0074] In the embodiment, the rear cover plate 10 is provided with a fourth observation hole 101 for providing installation space for the installation of the connecting rod bolt and providing an observation window and disassembly space for daily maintenance and inspection.

[0075] The embodiment of the utility model has two characteristics of high bearing and light weight, and can better meet customer demand.

[0076] The second embodiment of the present disclosure provides a plunger pump, comprising a crankshaft assembly, a connecting rod, a cross head, a plunger and any one of the plunger pump power end housings, the crankshaft assembly is installed in the first mounting hole 91;One end of the connecting rod is connected to the crankshaft assembly, the other end of the connecting rod is connected to the cross head, the cross head is arranged in the cylinder sleeve 3 and is in sliding connection with the cylinder sleeve 3;The front end of the cross head is connected with the plunger, the rotation of the crankshaft assembly can drive the plunger to reciprocate, so that the liquid suction and discharge of the plunger pump are realized.

[0077] The connecting rod ratio parameter of the plunger pump is designed as 0.19-0.25, the connecting rod ratio parameter is optimized during the lightweight design process of the plunger pump power end housing, the increase of the connecting rod ratio parameter can shorten the length of the connecting rod, so that the overall appearance structure of the plunger pump power end housing is more compact, so as to realize the lightweight design of the overall structure.

[0078] However, the shortening of the length of the connecting rod can increase the plunger acceleration and the connecting rod swing angle, and the corresponding inertia force and lateral force are also increased, so that the problem of difficult force at the dead point position is highlighted, according to the design of the utility model, the axis B of the cross head and the axis C of the crankshaft are located in different planes, so that even if the connecting rod ratio parameter is increased and the length of the connecting rod is shortened, the problem of difficult force at the dead point position will not occur.

[0079] The embodiment of the utility model has two characteristics of high bearing and light weight, and can better meet customer demand.

[0080] In the above embodiment of the utility model, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0081] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical" and "horizontal" as can be perceived herein relative to the accompanying drawings refer to the orientation of the components being described. However, it is to be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device described herein is turned over, and a spatially relative descriptor used herein is then deemed to refer to the reversed orientation of the device. Accordingly, the exemplary term "above" can encompass both an orientation of above and below. Thus, the exemplary term "above" can include both the above and below orientations. The device can also be oriented in other ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0082] In addition, it should be noted that throughout this specification, unless otherwise specified, the use of the ordinal adjectives "first", "second", "third", etc., to describe a particular feature or characteristic of a device or method can merely be to distinguish that particular feature or characteristic from another feature or characteristic. Thus, a device or method can include a combination of a first and second feature or characteristic without necessarily including a third or other feature or characteristic.

[0083] In the above embodiments, the description of each embodiment is focused on different aspects, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0084] The preferred embodiments of the present application have been described above with the specific details. Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A power end housing for a plunger pump, characterized by, The housing is internally provided with a plurality of mutually parallel vertical plates, a crankshaft bearing seat is arranged on the vertical plate, a first mounting hole for mounting a crankshaft assembly is arranged on the crankshaft bearing seat, a crosshead is arranged inside the housing, and the axis of the crosshead and the axis of the crankshaft assembly are located in different planes.

2. A power end housing for a plunger pump, characterized by The housing is internally provided with a plurality of mutually parallel vertical plates, a crankshaft bearing seat is arranged on the vertical plate The first mounting hole is eccentrically arranged relative to the second mounting hole towards the direction of the cylinder sleeve.

3. The plunger pump power end housing of claim 2, wherein, The first mounting hole is eccentrically arranged relative to the second mounting hole towards the direction of the cylinder sleeve.

4. The plunger pump power end housing of claim 1 or 2, wherein, A groove is arranged on the inner wall of the first mounting hole, and an oil channel hole is arranged on the bottom of the groove.

5. The plunger pump power end housing of claim 4, wherein, The groove is an arc structure.

6. The plunger pump power end housing of claim 1 or 2, wherein, The housing comprises an upper cover plate and a lower cover plate, the upper cover plate comprises at least one upper cover plate unit, the two sides of the upper cover plate unit are respectively welded with two adjacent vertical plates, the lower cover plate comprises at least one lower cover plate unit, and the two sides of the lower cover plate unit are respectively welded with two adjacent vertical plates.

7. The plunger pump power end housing of claim 6, wherein, The end of the vertical plate is connected with a front end plate, the upper cover plate and the lower cover plate are respectively inserted with the upper end face and the lower end face of the front end plate and are welded along the contact line of the insertion.

8. The plunger pump power end housing of claim 6, wherein, An oil return port is arranged on the lower cover plate, and a clamping groove is arranged on the oil return port.

9. A piston pump characterized in that The housing is internally provided with a plurality of mutually parallel vertical plates, a crankshaft bearing seat is arranged on the vertical plate 10. The piston pump of claim 9, wherein, The length ratio of the connecting rod to the radius of the crankshaft assembly is 0.19-0.25.

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