CN221003090U - Connecting rod cross head assembly and plunger pump - Google Patents

Abstract

The application relates to a connecting rod cross head assembly and a plunger pump, wherein the cross head assembly comprises a cross head, a connecting rod and a shaft pin, the cross head is provided with an arc-shaped groove, and the cross head is also provided with a first mounting hole; one end of the connecting rod is arc-shaped and is positioned in the arc-shaped groove, the connecting rod is also provided with a second mounting hole corresponding to the first mounting hole, and the connecting rod is penetrated with a first oil hole along the length direction; the pin shaft stretches into the first mounting hole and the second mounting hole so that the connecting rod is rotationally connected with the cross head, and the pin shaft is provided with a second oil hole so that two first oil holes at two ends of the second mounting hole are communicated. The pin shaft is used for rotationally connecting the cross head and the connecting rod, the arc-shaped arrangement and the arc-shaped groove of the connecting rod improve the contact area of the connecting rod and the cross head, the generated stress is reduced, the abrasion and cracking phenomena are reduced, the second oil hole of the pin shaft can be used for conveying lubricating oil in the first oil hole to the arc-shaped groove, the friction force between the connecting rod and the cross head is reduced, and the abrasion and cracking phenomena of the connecting rod and the cross head are further reduced.

Description

Connecting rod cross head assembly and plunger pump

Technical Field

The application relates to the field of plunger pumps, in particular to a connecting rod cross head assembly and a plunger pump.

Background

The plunger pump is used as an important component of fracturing equipment and is used for pumping the sand-carrying fracturing fluid into a well after being pressurized, so that the stratum is cracked, the fracturing yield-increasing operation is realized, and the technical level of the fracturing construction operation of the oil and gas field is directly influenced by the performance of the plunger pump. At present, the structure of the domestic and foreign fracturing plunger pump mostly adopts a horizontal reciprocating multi-cylinder plunger pump, such as a three-cylinder plunger pump and a five-cylinder plunger pump, and is generally composed of a power end and a hydraulic end. The power end is used for transmitting the power of the prime motor to the hydraulic end through a reduction transmission system and a crank connecting rod mechanism; the hydraulic end is used for converting mechanical energy transmitted by the power end into pressure energy of the working medium.

The connecting rod cross head assembly is used as an important component of the plunger pump, forms a crank-connecting rod mechanism together with a crankshaft, a bearing and other parts, one end of the connecting rod cross head assembly is connected with the crankshaft, and the other end of the connecting rod cross head assembly is connected with the hydraulic end plunger, so that the rotary motion of the prime motor is converted into the reciprocating linear motion, and the pumping operation of the fracturing site is realized. The connecting rod cross head assembly bears the load transmitted by the high-pressure medium and the reciprocating inertial load in the running process of the plunger pump, so that the structural strength is ensured, the lubrication effect of each rotary part and each movable part is ensured, and ablation in the process is avoided.

At present, a connecting rod of a common connecting rod cross head structure is connected with a cross head through a cross head pin, the cross head pin bears the work load transmitted by a high-pressure medium, and the cross head pin and the cross head are small in contact area, so that the generated stress is large, and the contact area of the cross head pin and the cross head can be worn and cracked.

Disclosure of utility model

The application aims to provide a connecting rod cross head assembly and a plunger pump, wherein the connecting rod cross head assembly is used for rotationally connecting a cross head with a connecting rod through a pin shaft, and the arc arrangement at one end of the connecting rod and the arc-shaped groove of the cross head improve the contact area between the connecting rod and the cross head, reduce the generated stress and reduce the abrasion and cracking phenomena.

To this end, in a first aspect, an embodiment of the present application provides a connecting rod crosshead assembly comprising: the cross head is provided with an arc-shaped groove and a first mounting hole; one end of the connecting rod is arc-shaped and is positioned in the arc-shaped groove, the connecting rod is further provided with a second mounting hole corresponding to the first mounting hole, the connecting rod is penetrated with a first oil hole along the length direction, and the extension path of the first oil hole penetrates through the second mounting hole; the pin shaft stretches into the first mounting hole and the second mounting hole so that the connecting rod is rotationally connected with the cross head, the pin shaft is provided with a second oil hole, and the second oil hole communicates two first oil holes at two ends of the second mounting hole.

In one possible implementation manner, the outer peripheral side of the pin shaft is further provided with an annular first oil groove, and the first oil groove is communicated with the first oil hole and the second oil hole.

In one possible implementation manner, a bushing is disposed in the first mounting hole, an end portion of the pin shaft is rotatably connected with the cross head through the bushing, the pin shaft is further provided with a third oil hole, and one end of the third oil hole is connected with the second oil hole, and the other end of the third oil hole faces the bushing.

In one possible implementation manner, a shaft sleeve is arranged in the second mounting hole, the pin shaft is rotationally connected with the connecting rod through the shaft sleeve, the shaft sleeve is provided with an oil passing hole communicated with the first oil hole and the second oil hole, and the inner side of the shaft sleeve is further provided with an annular second oil groove.

In one possible implementation, the end of the pin is further provided with a circlip.

In one possible implementation, an adapted arc-shaped bearing bush is arranged in the arc-shaped groove, and one end of the connecting rod, which faces the arc-shaped groove, is adapted to the bearing bush.

In one possible implementation manner, a third oil groove is further arranged on the inner side of the bearing bush, the third oil groove extends along the circumferential direction of the bearing bush, and the third oil groove is communicated with the first oil hole.

In one possible implementation manner, the outer surface of the cross head is connected with a guide plate, a first clamping portion is arranged on one side, facing the cross head, of the guide plate, a second clamping portion which is adapted to the first clamping portion is arranged on the outer surface of the cross head, one of the first clamping portion and the second clamping portion is a groove, and the other is a bump.

In one possible implementation manner, the first clamping portions extend along the width direction of the guide plate, the first clamping portions are provided with a plurality of clamping portions and are distributed along the length direction of the guide plate, the second clamping portions extend along the width direction of the cross head, and the second clamping portions are distributed along the length direction of the guide plate.

In a second aspect, an embodiment of the present application provides a plunger pump, including a connecting rod crosshead assembly according to any one of the above.

According to the connecting rod cross head assembly and the plunger pump provided by the embodiment of the application, the cross head assembly comprises a cross head, a connecting rod and a shaft pin, wherein the cross head is provided with an arc-shaped groove, and the cross head is also provided with a first mounting hole; one end of the connecting rod is arc-shaped and is positioned in the arc-shaped groove, the connecting rod is further provided with a second mounting hole corresponding to the first mounting hole, the connecting rod is penetrated with a first oil hole along the length direction, and the extending path of the first oil hole penetrates through the second mounting hole; the pin shaft stretches into the first mounting hole and the second mounting hole so that the connecting rod is rotationally connected with the cross head, the pin shaft is provided with a second oil hole, and the second oil hole is communicated with the two first oil holes at two ends of the second mounting hole. The pin shaft is used for rotationally connecting the cross head and the connecting rod, the arc-shaped groove of one end of the connecting rod is arranged with the arc-shaped groove of the cross head, so that the contact area of the connecting rod and the cross head is increased, the generated stress is reduced, the abrasion and cracking phenomena are reduced, meanwhile, the second oil hole of the pin shaft is used for communicating the two first oil holes at the two ends of the second mounting hole, lubricating oil in the first oil hole can be conveniently conveyed into the arc-shaped groove, the friction force between the connecting rod and the cross head is reduced, and the abrasion and cracking phenomena of the connecting rod and the cross head are further reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.

FIG. 1 illustrates an exploded view of a connecting rod crosshead assembly provided by an embodiment of the present application;

FIG. 2 illustrates a cross-sectional view of a cross-head provided by an embodiment of the present application;

FIG. 3 illustrates a cross-sectional view of a connecting rod cross-head assembly in a horizontal direction provided by an embodiment of the present application;

FIG. 4 illustrates a cross-sectional view of a connecting rod crosshead assembly provided in an embodiment of the present application in a vertical direction;

FIG. 5 shows a partial schematic view of FIG. 4;

Fig. 6 shows a schematic structural diagram of a plunger pump according to an embodiment of the present application.

Reference numerals illustrate:

1. A cross head; 11. an arc-shaped groove; 12. a first mounting hole; 13. a second engaging portion; 2. a connecting rod; 21. a second mounting hole; 22. a first oil hole; 3. a pin shaft; 31. a second oil hole; 32. a first oil groove; 33. a third oil hole; 34. a circlip; 4. a pull rod; 5. a bushing; 6. a shaft sleeve; 61. a second oil groove; 7. bearing bush; 71. a third oil groove; 8. a guide plate; 81. a first engaging portion.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The following disclosure provides many different embodiments, or examples, for implementing different structures of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "upper," "above," "front," "rear," and the like, may be used herein to describe one element's or feature's relative positional relationship or movement to another element's or feature as illustrated in the figures. Such 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 in the figure experiences a position flip or a change in attitude or a change in state of motion, then the indications of these directivities correspondingly change, for example: an element described as "under" or "beneath" another element or feature would then be oriented "over" or "above" the other element or feature. Accordingly, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

Fig. 1 shows an exploded view of a connecting rod crosshead assembly according to an embodiment of the present application, fig. 2 shows a cross-sectional view of a crosshead according to an embodiment of the present application, and fig. 3 shows a cross-sectional view of a connecting rod crosshead assembly according to an embodiment of the present application along a horizontal direction.

As shown in fig. 1 to 3, an embodiment of the present application provides a connecting rod crosshead assembly, which includes a crosshead 1, a connecting rod 2, and a pin 3, wherein the crosshead 1 is provided with an arc-shaped groove 11, and the crosshead 1 is further provided with a first mounting hole 12; one end of the connecting rod 2 is arc-shaped and is positioned in the arc-shaped groove 11, the connecting rod 2 is also provided with a second mounting hole 21 corresponding to the first mounting hole 12, the connecting rod 2 is penetrated with a first oil hole 22 along the length direction, and the extending path of the first oil hole 22 penetrates through the second mounting hole 21; the pin shaft 3 extends into the first mounting hole 12 and the second mounting hole 21 to rotatably connect the connecting rod 2 with the cross head 1, the pin shaft 3 is provided with a second oil hole 31, and the second oil hole 31 communicates the two first oil holes 22 at both ends of the second mounting hole 21.

It is to be understood that the connecting rod cross head assembly comprises a cross head 1, the cross head 1 is provided with an inner cavity, an arc-shaped groove 11 is formed in the inner cavity of the cross head 1, the cross head 1 is further connected with a pull rod 4, the pull rod 4 is located on one side, away from an opening of the arc-shaped groove 11, of the cross head 1, the pull rod 4 is connected with the cross head 1 through bolts and cylindrical pins, the cylindrical pins bear a certain load, the stress of the bolts is reduced, the pull rod 4 is connected with a plunger on a hydraulic end, and power is transmitted to the hydraulic end. The cross head 1 is further provided with a first mounting hole 12, the first mounting hole 12 penetrates through the cross head 1, the penetrating direction is perpendicular to the length direction of the pull rod 4, and the first mounting hole 12 is further communicated with the inner cavity of the arc-shaped groove 11.

The connecting rod cross head assembly further comprises a connecting rod 2, the connecting rod 2 is provided with a first end and a second end along the length direction, the first end of the connecting rod 2 is in an arc shape and is located in an arc-shaped groove 11, namely, the first end of the connecting rod 2 is rotationally connected with the cross head 1 to form a revolute pair, the connecting rod 2 bears a working load F transmitted by a hydraulic end through the cross head 1, and the arc-shaped groove 11 of the first end of the connecting rod 2 is provided with the arc-shaped groove 11 of the cross head 1 to improve the contact area between the connecting rod 2 and the cross head 1, so that the generated stress can be reduced, and the abrasion and cracking phenomena of the connecting rod 2 and the cross head 1 can be reduced. The second end of the connecting rod 2 is assembled to the crank throw of the crankshaft to form a rotary kinematic pair with the crankshaft.

When the plunger pump operates, the external power source drives the crank shaft and the crank throw to perform rotary motion, drives the connecting rod 2 to perform reciprocating swing, drives the cross head 1 to perform reciprocating linear motion, converts the rotary motion of the external power source into the reciprocating linear motion, transmits the reciprocating linear motion to the hydraulic end, and realizes the suction and discharge of the working medium.

The connecting rod 2 is provided with a first oil hole 22, the connecting rod 2 of the first oil hole 22 penetrates through the connecting rod 2 in the length direction, the first oil hole 22 is communicated with the arc-shaped groove 11, and lubricating oil can be conveyed into the arc-shaped groove 11 from the first oil hole 22, so that the connecting rod 2 and the cross head 1 are lubricated, the friction force between the connecting rod 2 and the cross head 1 is reduced, and the abrasion and cracking phenomena between the connecting rod 2 and the cross head 1 are further reduced. The connecting rod 2 is further provided with a second mounting hole 21 corresponding to the first mounting hole 12, the second mounting hole 21 penetrates through the connecting rod 2 in the thickness direction, and when the first end of the connecting rod 2 stretches into the arc-shaped groove 11, the second mounting hole 21 is communicated with the first mounting hole 12. However, due to the provision of the second mounting holes 21, the first oil holes 22 are ruptured by the second mounting holes 21, forming two first oil holes 22.

The connecting rod cross head assembly further comprises a pin shaft 3, the pin shaft 3 is cylindrical, when the connecting rod 2 is positioned in the arc-shaped groove 11, the first mounting hole 12 corresponds to the second mounting hole 21, and the pin shaft 3 stretches into the first mounting hole 12 and the second mounting hole 21 at the moment so that the connecting rod 2 is rotationally connected with the cross head 1 in a mode that the connecting rod 2 can be fixedly connected with the pin shaft 3, and the cross head 1 is rotationally connected with the pin shaft 3; or the connecting rod 2 is rotationally connected with the pin shaft 3, and the cross head 1 is fixedly connected with the pin shaft 3; or the connecting rod 2 is rotationally connected with the pin shaft 3, and the cross head 1 is rotationally connected with the pin shaft 3. The pin 3 only plays a role of hinging and does not bear the axial load F transmitted by the hydraulic end.

The pin shaft 3 is further provided with a second oil hole 31 communicated with the first oil hole 22, so that two first oil holes 22 positioned at two ends of the second mounting hole 21 are communicated, lubricating oil in the first oil holes 22 can be conveniently conveyed into the arc-shaped groove 11, friction force between the connecting rod 2 and the cross head 1 is reduced, and abrasion and cracking phenomena are further reduced.

According to the application, the cross head 1 is rotationally connected with the connecting rod 2 through the pin shaft 3, namely, one end of the connecting rod 2 is positioned in the arc-shaped groove 11 of the cross head 1 and forms a revolute pair with the cross head 1, and as the arc-shaped arrangement of the first end of the connecting rod 2 and the arc-shaped groove 11 of the cross head 1 improve the contact area of the connecting rod 2 and the cross head 1, the generated stress is reduced, the abrasion and cracking phenomena are reduced, the cross head 1 is of a semicircular integral structure, the structural rigidity is good, and the width dimension can be reduced while a certain bearing area is ensured, so that the cylinder spacing and the width of the whole pump are reduced. Meanwhile, the second oil holes 31 of the pin shaft 3 are communicated with the two first oil holes 22 at two ends of the second mounting hole 21, so that lubricating oil in the first oil holes 22 can be conveyed into the arc-shaped groove 11, friction force between the connecting rod 2 and the cross head 1 is reduced, and abrasion and cracking phenomena between the connecting rod 2 and the cross head 1 are further reduced.

Referring to fig. 1, in some alternative embodiments, the outer circumferential side of the pin 3 is further provided with an annular first oil groove 32, and the first oil groove 32 communicates with the first oil hole 22 and the second oil hole 31. When the pin shaft 3 and the connecting rod 2 rotate mutually, the lubricating oil of the first oil hole 22 can flow from the first oil groove 32 to the second oil hole 31, and can also flow from the second oil hole 31 to the first oil hole 22, so that the lubricating oil can smoothly flow from the first oil hole 22 to the arc-shaped groove 11, and the lubricating oil can lubricate the connecting rod 2 and the cross head 1 conveniently. Meanwhile, lubricating oil can be lubricated and stored at the first oil groove 32, so that friction force and abrasion between the pin shaft 3 and the connecting rod 2 are reduced, and the rotating smoothness between the pin shaft 3 and the connecting rod 2 is improved.

The two second oil holes 31 extend along the radial direction of the pin shaft 3, and the two second oil holes 31 are perpendicular to each other, so that the speed of conveying the lubricating oil can be further improved by the arrangement of the two second oil holes 31.

Referring to fig. 4 and 5, fig. 4 shows a cross-sectional view of a connecting rod crosshead assembly according to an embodiment of the present application in a vertical direction, and fig. 5 shows a partial schematic view of fig. 4. In some alternative embodiments, a bushing 5 is disposed in the first mounting hole 12, the end of the pin 3 is rotatably connected to the cross head 1 through the bushing 5, the pin 3 is further provided with a third oil hole 33, and one end of the third oil hole 33 is connected to the second oil hole 31 and the other end faces the bushing 5.

The material of bush 5 generally selects for use copper alloy material, bush 5 is arranged in first mounting hole 12 and is connected with cross head 1, bush 5 is provided with two, and the both ends of round pin axle 3 stretch into respectively in the inner chamber of two bushes 5 and rotate with bush 5 and be connected, and then make round pin axle 3 rotate with cross head 1 and be connected, and the damage of cross head 1 when round pin axle 3 rotates for cross head 1 can be reduced in the setting of bush 5, when bush 5 appears the damage, still can dismantle bush 5 from cross head 1 in order to replace, and then improves cross head 1's life.

The pin shaft 3 is further provided with a third oil hole 33, one end of the third oil hole 33 is connected with the second oil hole 31, and the other end of the third oil hole faces the bushing 5, so that lubricating oil can flow into the third oil hole 33 from the second oil hole 31 and then flow between the bushing 5 and the pin shaft 3 from the third oil hole 33, the smoothness of rotation between the bushing 5 and the pin shaft 3 is improved, meanwhile, the friction force between the pin shaft 3 and the bushing 5 is reduced, and the loss between the pin shaft 3 and the bushing 5 is reduced.

Referring to fig. 1 and 5, in some alternative embodiments, a sleeve 6 is disposed in the second mounting hole 21, the pin shaft 3 is rotatably connected to the connecting rod 2 through the sleeve 6, the sleeve 6 is provided with an oil passing hole communicating with the first oil hole 22 and the second oil hole 31, and an annular second oil groove 61 is further disposed at the inner side of the sleeve 6. The material of axle sleeve 6 generally selects for use copper alloy material, and axle sleeve 6 stretches into in the second mounting hole 21 of connecting rod 2 and is connected with connecting rod 2, and axle sleeve 6 interference fit is in the second mounting hole 21 of connecting rod 2, and round pin axle 3 rotates with axle sleeve 6 to be connected, and then makes round pin axle 3 rotate with connecting rod 2 to be connected, and the damage of connecting rod 2 when round pin axle 3 rotates for connecting rod 2 can be reduced in the setting of axle sleeve 6, when the damage appears in axle sleeve 6, still can dismantle in order to replace with axle sleeve 6 follow connecting rod 2, and then improves connecting rod 2's life.

The sleeve 6 is provided with oil passing holes so that the first oil hole 22 and the second oil hole 31 can be communicated without affecting the transition of the lubricating oil from the first oil hole 22 to the second oil hole 31 and without affecting the transition of the lubricating oil from the second oil hole 31 to the first oil hole 22.

The shaft sleeve 6 is further provided with an annular second oil groove 61, so that lubricating oil can be stored between the pin shaft 3 and the shaft sleeve 6, smoothness of rotation between the pin shaft 3 and the shaft sleeve 6 is improved, friction force between the pin shaft 3 and the shaft sleeve 6 is reduced, and loss between the pin shaft 3 and the shaft sleeve 6 is reduced.

Referring to fig. 5, in some alternative embodiments, the end portion of the pin shaft 3 is further provided with two circlips 34, and the circlips 34 are respectively located at two ends of the pin shaft 3, so as to limit the axial position of the pin shaft 3, prevent the pin shaft 3 from moving axially in the second mounting hole 21 and the first mounting hole 12, and prevent the first oil hole 22, the second oil hole 31, and the first oil groove 32 from being misplaced.

Referring to fig. 1, in some alternative embodiments, an adapted arcuate bearing shell 7 is provided within the arcuate recess 11, and the end of the connecting rod 2 facing the arcuate recess 11 is adapted to the interior cavity of the bearing shell 7. The axle bush 7 stretches into in the arc recess 11 of cross head 1 and be connected with cross head 1, and connecting rod 2 stretches into the inner chamber of axle bush 7 and rotates with axle bush 7 to be connected, and then makes connecting rod 2 and cross head 1 rotate to be connected, and the damage of cross head 1 when the setting up of axle bush 7 can reduce connecting rod 2 and rotate for cross head 1, when the damage appears in axle bush 7, still can dismantle the axle bush 7 from cross head 1 in order to replace, and then improves cross head 1's life.

In some alternative embodiments, the inner side of the bearing shell 7 is further provided with a third oil groove 71, the third oil groove 71 extending in the circumferential direction of the bearing shell 7, the third oil groove 71 communicating with the first oil hole 22. The lubricating oil in the first oil hole 22 can flow into the third oil groove 71, the third oil groove 71 can store the lubricating oil between the connecting rod 2 and the bearing bush 7, so that the smoothness of rotation between the connecting rod 2 and the bearing bush 7 is improved, the friction force between the connecting rod 2 and the bearing bush 7 is reduced, and the loss of the connecting rod 2 and the bearing bush 7 is reduced.

Referring to fig. 1 and 2, in some alternative embodiments, a guide plate 8 is connected to an outer surface of the cross head 1, a first engaging portion 81 is disposed on a side of the guide plate 8 facing the cross head 1, a second engaging portion 13 adapted to the first engaging portion 81 is disposed on the outer surface of the cross head 1, one of the first engaging portion 81 and the second engaging portion 13 is a groove, and the other is a bump.

The guide plate 8 is made of copper alloy materials, wherein the guide plate 8 is connected with the cross head 1 through bolts, and the cross head 1 is assembled in the upper slide rail and the lower slide rail of the power end with the guide plate 8 to form a sliding pair. The guide plate 8 is provided with a first clamping part 81, the cross head 1 is provided with a second clamping part 13, the first clamping part 81 is clamped with the second clamping part 13, when the cross head 1 moves, the first clamping part 81 and the second clamping part 13 can bear sliding friction force generated by the movement of the cross head 1, the stress of bolts is reduced, and the connection stability of the guide plate 8 and the cross head 1 is improved.

In one example, the first engaging portion 81 is a groove, and the second engaging portion 13 is a protrusion adapted to the groove.

In one example, the first engaging portion 81 is a bump, and the second engaging portion 13 is a groove adapted to the bump.

In some alternative embodiments, the first engaging portion 81 extends in the width direction of the guide plate 8, the first engaging portion 81 is provided in plurality and arranged in the length direction of the guide plate 8, the second engaging portion 13 extends in the width direction of the crosshead 1, and the second engaging portion 13 is provided in plurality and arranged in the length direction of the crosshead 1.

The plurality of first engaging portions 81 are arranged at intervals along the longitudinal direction of the guide plate 8, and the plurality of second engaging portions 13 are arranged at intervals along the longitudinal direction of the cross head 1. The provision of the plurality of first engaging portions 81 and the plurality of second engaging portions 13 further improves the stability of the connection of the guide plate 8 with the crosshead 1.

In some alternative embodiments, the outer surface of the guide plate 8 is also provided with axial and radial oil grooves for storing lubricating oil and lubricating the moving parts.

Referring to fig. 1-6, fig. 6 shows a schematic structural diagram of a plunger pump according to an embodiment of the present application. The application also includes a plunger pump comprising a connecting rod crosshead assembly according to any of the above.

The connecting rod cross head assembly comprises a cross head 1, a connecting rod 2 and a pin shaft 3, wherein the cross head 1 is provided with an arc-shaped groove 11, and the cross head 1 is also provided with a first mounting hole 12; one end of the connecting rod 2 is arc-shaped and is positioned in the arc-shaped groove 11, the connecting rod 2 is also provided with a second mounting hole 21 corresponding to the first mounting hole 12, the connecting rod 2 is penetrated with a first oil hole 22 along the length direction, and the extending path of the first oil hole 22 penetrates through the second mounting hole 21; the pin 3 is inserted into the first and second mounting holes 12 and 21 to rotatably connect the connecting rod 2 with the cross head 1, and the pin 3 is provided with a second oil hole 31 communicating with the first oil hole 22 to communicate the two first oil holes 22 at both ends of the second mounting hole 21.

The pin shaft 3 rotationally connects the cross head 1 with the connecting rod 2, namely one end of the connecting rod 2 is positioned in the arc-shaped groove 11 of the cross head 1 and forms a revolute pair with the cross head 1, as the arc-shaped arrangement of the first end of the connecting rod 2 and the arc-shaped groove 11 of the cross head 1 improve the contact area of the connecting rod 2 and the cross head 1, the generated stress is reduced, the abrasion and cracking phenomenon is reduced, meanwhile, the second oil hole 31 of the pin shaft 3 is communicated with the two first oil holes 22 positioned at two ends of the second mounting hole 21, so that lubricating oil in the first oil holes 22 can be conveyed into the arc-shaped groove 11, the friction force between the connecting rod 2 and the cross head 1 is reduced, and the abrasion and cracking phenomenon of the connecting rod 2 and the cross head 1 is further reduced.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A connecting rod crosshead assembly, comprising:

The cross head is provided with an arc-shaped groove and a first mounting hole;

One end of the connecting rod is arc-shaped and is positioned in the arc-shaped groove, the connecting rod is further provided with a second mounting hole corresponding to the first mounting hole, the connecting rod is penetrated with a first oil hole along the length direction, and the extension path of the first oil hole penetrates through the second mounting hole;

The pin shaft stretches into the first mounting hole and the second mounting hole so that the connecting rod is rotationally connected with the cross head, the pin shaft is provided with a second oil hole, and the second oil hole communicates two first oil holes at two ends of the second mounting hole.

2. The connecting rod crosshead assembly according to claim 1, wherein an annular first oil groove is further provided on an outer peripheral side of the pin shaft, and the first oil groove communicates with the first oil hole and the second oil hole.

3. The connecting rod crosshead assembly according to claim 1, wherein a bushing is disposed in the first mounting hole, an end of the pin shaft is rotatably connected with the crosshead through the bushing, the pin shaft is further provided with a third oil hole, and one end of the third oil hole is connected with the second oil hole and the other end of the third oil hole faces the bushing.

4. The connecting rod crosshead assembly according to claim 1, wherein a shaft sleeve is disposed in the second mounting hole, the pin shaft is rotatably connected with the connecting rod through the shaft sleeve, the shaft sleeve is provided with an oil passing hole communicated with the first oil hole and the second oil hole, and an annular second oil groove is further disposed on the inner side of the shaft sleeve.

5. The connecting rod crosshead assembly according to claim 1, wherein the pin shaft is further provided with a circlip at an end thereof.

6. The connecting rod crosshead assembly according to claim 1, wherein an adapted arcuate bushing is disposed within the arcuate groove, the connecting rod being adapted to the bushing toward an end of the arcuate groove.

7. The connecting rod crosshead assembly according to claim 6, wherein the inner side of the bearing shell is further provided with a third oil groove extending in the circumferential direction of the bearing shell, the third oil groove communicating with the first oil hole.

8. The connecting rod crosshead assembly according to claim 1, wherein an outer surface of the crosshead is connected with a guide plate, a first clamping portion is disposed on a side of the guide plate facing the crosshead, a second clamping portion adapted to the first clamping portion is disposed on the outer surface of the crosshead, one of the first clamping portion and the second clamping portion is a groove, and the other is a bump.

9. The connecting rod crosshead assembly according to claim 8, wherein the first engagement portions extend in a width direction of the guide plate, the first engagement portions are provided in plurality and are arranged in a length direction of the guide plate, the second engagement portions extend in a width direction of the crosshead, and the second engagement portions are provided in plurality and are arranged in a length direction of the guide plate.

10. A plunger pump comprising a ten-head assembly of a connecting rod according to any one of claims 1 to 9.