CN219570589U - Connecting structure of connecting rod and cross head and fracturing pump - Google Patents

Abstract

The utility model provides a connecting structure of a connecting rod and a cross head and a fracturing pump, and relates to the technical field of fracturing pumps. Compared with the prior art, the connecting structure of the connecting rod and the cross head abandons the traditional connecting structure of the connecting rod and the cross head by adopting the pin shaft, and eliminates the eccentric wear phenomenon caused by the traditional connecting structure.

Description

Connecting structure of connecting rod and cross head and fracturing pump

Technical Field

The utility model relates to the technical field of fracturing pumps, in particular to a connecting structure of a connecting rod and a cross head and a fracturing pump.

Background

The reciprocating pump is especially a fracturing pump used in petroleum exploitation, and has complex working conditions and severe use environments. The connecting rod and the cross head in the fracturing pump form a friction motion pair, namely, the small head of the connecting rod makes reciprocating half-circular motion on the half-tile surface of the cross head. The connecting rod and the cross head of the traditional fracturing pump are connected together through the cross head pin shaft, the connecting structure brings great inconvenience to installation and disassembly, the maintenance cost is increased, and the connecting rod and the cross head of the connecting structure are affected by the machining precision and easily generate eccentric wear phenomenon to influence the service life.

Disclosure of Invention

The utility model aims to solve the problems that: how to provide a connecting structure of a connecting rod and a cross head, which can eliminate the eccentric wear between the connecting rod and the cross head.

The utility model provides a connecting structure of a connecting rod and a cross head, which comprises the following components: connecting rod, cross head, locating part and axle bush, arc recess has been seted up to the inside of cross head, the axle bush set up in the arc recess, the locating part connect in the inside of cross head, the connecting rod includes first connector and second connector, first connector is used for being connected with the bent axle of fracturing pump, the second connector is installed the inside of cross head, just the second connector is located the locating part with between the axle bush, works as the connecting rod is to being close to when the axle bush direction moves, the second connector be used for with the axle bush butt, works as the connecting rod is to being close to when the direction motion of fracturing pump, the second connector be used for with the locating part butt.

Compared with the prior art, the connecting structure of the connecting rod and the cross head has the following beneficial effects:

according to the connecting structure of the connecting rod and the cross head, the first connecting head of the connecting rod can be connected with the crankshaft of the fracturing pump, the cross head can be connected with the plunger, and the connecting structure of the connecting rod and the cross head plays a role in transmitting the power of the crankshaft and the plunger in the working process of the fracturing pump. When the connecting rod is used, the bearing bush is arranged at the arc-shaped groove in the cross head, then the second connector of the connecting rod is arranged in the cross head, the second connector of the connecting rod can do reciprocating semi-circular motion on the bearing bush, and when the connecting rod moves towards the bearing bush (namely, the crankshaft of the fracturing pump pushes the plunger to do work forwards), the second connector is in contact with the bearing bush, and a gap exists between the second connector and the limiting piece; when the connecting rod moves towards the crankshaft direction of the fracturing pump (namely, the crankshaft of the fracturing pump pulls the plunger to do work backwards), the second connector contacts with the limiting piece at the moment, and a gap exists between the second connector and the bearing bush. The second connector is hinged in the motion process between the limiting piece and the bearing bush, and the connecting rod is stressed less when in return stroke due to the fact that the connecting rod is mainly on the contact surface of the bearing bush when in reciprocating motion to do work, so that the limiting piece is stressed only when the connecting rod pulls the plunger back, and the eccentric wear phenomenon brought by the traditional pin shaft connecting structure can be eliminated, and the service life can be prolonged. Compared with the prior art, the connecting structure of the connecting rod and the cross head abandons the traditional connecting structure of the connecting rod and the cross head by adopting the cross head pin shaft, and eliminates the eccentric wear phenomenon caused by the traditional connecting structure.

Optionally, the cross head is a split structure, the cross head comprises an upper structure and a lower structure, and the upper structure and the lower structure are detachably connected.

Optionally, the arc-shaped groove is opened between the upper structure and the lower structure.

Optionally, the cross head is of an integral structure, and a process hole is formed in the cross head.

Optionally, the bearing bush is arc-shaped, and two ends of the bearing bush are used for abutting against the limiting piece.

Optionally, the locating part includes first briquetting and second briquetting, first briquetting with the second briquetting interval connect in the inside of cross head, just the second connector is located first briquetting with between the second briquetting, when the connecting rod is to being close to the direction motion of fracturing pump, the second connector be used for with first briquetting with the tip butt of second briquetting.

Optionally, the end portion of the first pressing block, which is used for contacting with the second connector, is provided with an arc surface structure adapted to the shape of the second connector.

Optionally, the connection structure of the connecting rod and the cross head further comprises a threaded connection piece, a first threaded hole is formed in the limiting piece, a second threaded hole matched with the first threaded hole is formed in the cross head, and the threaded connection piece is used for penetrating through the first threaded hole to be connected with the second threaded hole so as to fix the limiting piece on the cross head.

Optionally, the connecting rod is an integral forging structure.

In addition, the utility model also provides a fracturing pump, which comprises the connecting structure of the connecting rod and the cross head.

Since technical improvements and technical effects obtained by the fracturing pump are the same as those of the connecting structure of the connecting rod and the cross head, detailed description of the technical effects of the fracturing pump is omitted.

Drawings

FIG. 1 is a schematic diagram of a connecting structure of a connecting rod and a cross head according to an embodiment of the present utility model;

FIG. 2 is an enlarged view of a portion of the portion I of FIG. 1;

fig. 3 is a schematic structural diagram of a connecting structure of a connecting rod and a cross head according to an embodiment of the utility model.

Reference numerals illustrate:

1. a connecting rod; 11. a first connector; 12. a second connector; 13. a shaft; 2. a cross head; 21. a process hole; 3. a limiting piece; 31. a first briquette; 32. a second briquetting; 4. bearing bush; 5. a threaded connection.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the description of the present utility model, the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom", "front", "rear", "inner", and "outer", etc. are used based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present disclosure, and are not intended to indicate or imply that the apparatus referred to must have a specific orientation, be configured and manipulated in a specific orientation, and therefore should not be construed as limiting the scope of protection of the present disclosure.

In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description of the present specification, the descriptions of the terms "embodiment," "one embodiment," and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or embodiment is included in at least one embodiment or illustrated embodiment of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same examples or implementations. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or implementations.

Moreover, in the drawings, the X-axis represents the lateral direction, i.e., the left-right position, and the positive direction of the X-axis (i.e., the arrow of the X-axis is directed) represents the left, and the negative direction of the X-axis (i.e., the direction opposite to the positive direction of the X-axis) represents the right.

It should also be noted that the foregoing X-axis is provided merely for the purpose of describing the present utility model and for simplicity of description, and is not intended to indicate or imply that the devices or elements referred to must be in a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model.

In order to solve the above technical problems, as shown in fig. 1, a connecting structure of a connecting rod and a cross head according to the present utility model includes: the novel fracturing pump comprises a connecting rod 1, a cross head 2, a limiting piece 3 and a bearing bush 4, wherein an arc-shaped groove is formed in the cross head 2, the bearing bush 4 is arranged in the arc-shaped groove, the limiting piece 3 is connected to the inside of the cross head 2, the connecting rod 1 comprises a first connector 11 and a second connector 12, the first connector 11 is used for being connected with a crankshaft of the fracturing pump, the second connector 12 is arranged in the cross head 2, the second connector 12 is located between the limiting piece 3 and the bearing bush 4, when the connecting rod 1 moves towards the direction close to the bearing bush 4, the second connector 12 is used for being abutted against the bearing bush 4, and when the connecting rod 1 moves towards the direction close to the fracturing pump, the second connector 12 is used for being abutted against the limiting piece 3.

Specifically, the connecting rod small end (namely the second connector 12 of the connecting rod 1) and the cross head of the traditional fracturing pump are connected by adopting a cross head pin shaft, the cross head pin shaft connecting structure is matched with a pin shaft copper sleeve at the connecting rod small end, the cross head is required to be provided with a pin shaft mounting hole, and the machining process is more and more difficult. The fit clearance between the small end of the connecting rod and the half bush of the cross head and the fit clearance between the pin shaft hole of the small end of the connecting rod and the pin shaft are strictly controlled, and the requirements on machining precision and mounting precision are high. In the utility model, the pin shaft mounting hole on the small end of the connecting rod and the embedded wear-resistant copper sleeve are eliminated, so that the processing procedures and connecting parts are reduced, the processing time is shortened, and the assembly quality is improved. Secondly, the cross head copper sleeve is canceled, namely the width of the cross head half tile (namely the bearing bush 4) with the same outer diameter can be widened, the bearing area of the cross head and the small end of the connecting rod is increased, the specific pressure is reduced, the safety coefficient is improved, and the service life is prolonged.

In this embodiment, as shown in fig. 1, the first connector 11 of the connecting rod 1 is used for connecting with the crankshaft of the fracturing pump, the cross head 2 is used for connecting with the plunger, and the connecting structure of the connecting rod and the cross head plays a role in transmitting the power of the crankshaft and the plunger in the working process of the fracturing pump. When the hydraulic fracturing device is used, the bearing bush 4 is arranged at an arc-shaped groove in the cross head 2, then the second connector 12 of the connecting rod 1 is arranged in the cross head 2, the second connector 12 of the connecting rod 1 can do reciprocating semi-circular motion on the bearing bush 4, when the connecting rod 1 moves towards the bearing bush 4 (namely, a crankshaft of the fracturing pump pushes a plunger to do work forwards), the second connector 12 is in contact with the bearing bush 4 at the moment, and a gap exists between the second connector 12 and the limiting piece 3; when the connecting rod 1 moves towards the crankshaft direction of the fracturing pump (namely, the crankshaft of the fracturing pump pulls the plunger to do work backwards), the second connector 12 is in contact with the limiting piece 3 at the moment, and a gap exists between the second connector 12 and the bearing bush 4. The second connector 12 is hinged in the movement process between the limiting piece 3 and the bearing bush 4, and because the connecting rod 1 is mainly stressed on the contact surface of the bearing bush 4 when doing work in a reciprocating motion and is smaller in return stroke, the limiting piece 3 is stressed only when the connecting rod 1 pulls the plunger back, so that the eccentric wear phenomenon brought by the traditional pin shaft connecting structure can be eliminated, and the service life can be prolonged. Compared with the prior art, the connecting structure of the connecting rod and the cross head abandons the traditional connecting structure of the connecting rod and the cross head by adopting the cross head pin shaft, and eliminates the eccentric wear phenomenon caused by the traditional connecting structure.

Optionally, the cross head 2 is a split structure, and the cross head 2 includes an upper structure and a lower structure, and the upper structure and the lower structure are detachably connected.

Specifically, for the convenience of processing the arc-shaped groove, the cross head 2 may be designed as a split structure, that is, the cross head 2 is divided into an upper structure and a lower structure, and the upper structure and the lower structure of the cross head 2 may be connected together by a detachable connection manner through bolts.

In the present embodiment, by designing the cross head 2 as a split structure including the upper structure and the lower structure, it is possible to facilitate machining of the arc-shaped groove, that is, to improve the machining manufacturability of the mounting surface of the bearing shell 4, and to greatly shorten the machining time.

Optionally, the arc-shaped groove is opened between the upper structure and the lower structure.

In this embodiment, when the cross head 2 processes the arc-shaped groove, the upper structure and the lower structure of the cross head 2 are separated, then the arc-shaped groove can be processed by separating the connecting end surface between the upper structure and the lower structure, and after the arc-shaped groove is processed, the upper structure and the lower structure of the cross head 2 are connected into a whole through bolts, i.e. are located between the upper structure and the lower structure of the arc-shaped groove.

Optionally, the cross head 2 is of a monolithic structure, and the cross head 2 is provided with a process hole 21.

Specifically, referring to fig. 3, the cross head 2 may be a forged integral structure, and the hole diameter of the process hole 21 formed on the cross head 2 may be appropriately increased according to actual needs, so as to facilitate processing of the arc-shaped groove.

In this embodiment, by designing the cross head 2 as a monolithic structure, the overall strength of the cross head 2 is better, and the process hole 21 formed on the cross head 2 can be used to conveniently process the arc-shaped groove on the one hand, and can be used as a lightening hole on the other hand, so as to reduce the overall weight of the cross head 2.

Optionally, the bearing bush 4 is arc-shaped, and two ends of the bearing bush 4 are used for abutting against the limiting piece 3.

In this embodiment, referring to fig. 1 and 2, after the limiting member 3 is connected to the cross head 2, the limiting member 3 may be abutted against the end of the bearing bush 4, where the bearing bush 4 is in an arc shape, and the end of the bearing bush 4 is two ends of the arc shape, so that the bearing bush 4 is limited and fixed at the arc-shaped groove by the limiting member 3, that is, the bearing bush 4 can be always attached to the arc-shaped groove through the limiting member 3.

Optionally, the connecting rod 1 further includes a rod body 13, the first connecting head 11 and the second connecting head 12 are respectively located at two opposite sides of the rod body 13, and a cross-sectional dimension of the rod body 13 in a direction from the first connecting head 11 to the second connecting head 12 is gradually reduced.

Specifically, as shown in fig. 1, the connecting rod 1 may have an i-shaped cross-sectional shape that gradually decreases from the first connecting head 11 to the second connecting head 12 (in the direction opposite to the X-axis in fig. 1), that is, the cross-sectional dimension of the shaft 13 in the direction from the first connecting head 11 to the second connecting head 12 gradually decreases.

In the present embodiment, since the connecting rod 1 is subjected to the alternating pressure force and the inertial force of the expanding gas, the connecting rod 1 should have sufficient strength and rigidity, and should minimize the mass of the connecting rod 1 itself, the mass of the connecting rod 1 itself can be reduced by designing the shaft 13 to gradually decrease in cross-sectional dimension in the direction from the first connecting head 11 to the second connecting head 12, so that the inertial force can be reduced.

Optionally, the limiting piece 3 includes a first pressing block 31 and a second pressing block 32, the first pressing block 31 and the second pressing block 32 are connected to the inside of the cross head 2 at intervals, and the second connector 12 is located between the first pressing block 31 and the second pressing block 32, when the connecting rod 1 moves towards a direction close to the fracturing pump, the second connector 12 is used for abutting with the ends of the first pressing block 31 and the second pressing block 32.

In this embodiment, as shown in fig. 1 and fig. 2, the first pressing block 31 and the second pressing block 32 have the same structure, and may be square block structures, where the first pressing block 31 and the second pressing block 32 are symmetrically disposed inside the crosshead 2 relative to the second connector 12, the first pressing block 31 and the second pressing block 32 may be connected to the crosshead 2 through bolts, and right end surfaces (opposite directions of the X axis in fig. 1) of the first pressing block 31 and the second pressing block 32 are respectively abutted against two ends of the bearing bush 4, so as to limit the bearing bush 4 at the arc-shaped groove of the crosshead 2, when the connecting rod 1 moves toward the crankshaft direction of the fracturing pump (i.e. the crankshaft of the fracturing pump pulls the plunger to apply work backward), at this time, the second connector 12 contacts the first pressing block 31 and the second pressing block 32, and the first pressing block 31 and the second pressing block 32 together play a role of limiting the second connector 12.

Optionally, the end portions of the first pressing block 31 and the second pressing block 32, which are used for contacting with the second connector 12, are provided with an arc surface structure adapted to the shape of the second connector 12.

In this embodiment, as shown in fig. 1 and fig. 2, the end portions of the first pressing block 31 and the second pressing block 32, which are used for contacting with the second connector 12, are both arc structures, and the arc structures are adapted to the shape of the second connector 12, so that when the second connector 12 contacts with the first pressing block 31 and the second pressing block 32, the arc structures of the end portions of the first pressing block 31 and the second pressing block 32 may not affect the second connector 12 to do the deflection motion.

Optionally, the connecting structure of the connecting rod and the cross head further comprises a threaded connecting piece 5, a first threaded hole is formed in the limiting piece 3, a second threaded hole matched with the first threaded hole is formed in the cross head 2, and the threaded connecting piece 5 is used for penetrating through the first threaded hole and connecting with the second threaded hole, so that the limiting piece 3 is fixed on the cross head 2.

In this embodiment, as shown in fig. 1 and fig. 2, the threaded connection member 5 may be a bolt, and the threaded connection member 5 may pass through a first threaded hole on the limiting member 3 and be in threaded connection with a second threaded hole on the cross head 2, so that the limiting member 3 may be fixedly mounted on the cross head 2.

Alternatively, the connecting rod 1 is of an integral forging structure.

In this embodiment, the connecting rod 1 is subjected to forces from the pistons and the forces of its own oscillation and the reciprocating inertia of the piston assembly during the working process, the magnitudes and directions of these forces being periodically varied. The connecting rod 1 is subjected to alternating loads such as compression and tension. The connecting rod 1 must have sufficient fatigue strength and structural rigidity. The fatigue strength is insufficient, so that the connecting rod 1 is often broken, and a major accident of complete machine damage is generated. If the rigidity is insufficient, the connecting rod 1 is bent and deformed and the first connecting head 11 is out of round, so that the eccentric wear phenomenon is liable to occur. Therefore, the connecting rod 1 can have high fatigue strength and rigidity by designing it as an integral forging structure.

In addition, the utility model also provides a fracturing pump, which comprises a connecting structure of the connecting rod and the cross head.

Because the technical improvement and the obtained technical effect of the fracturing pump are the same as the connecting structure of the connecting rod and the cross head, the technical effect of the fracturing pump is not described in detail.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the utility model.

Claims (10)

1. A connecting structure of a connecting rod and a cross head, characterized by comprising: connecting rod (1), cross head (2), locating part (3) and axle bush (4), arc recess has been seted up to the inside of cross head (2), axle bush (4) set up in the arc recess, locating part (3) connect in the inside of cross head (2), connecting rod (1) include first connector (11) and second connector (12), first connector (11) are used for being connected with the bent axle of fracturing pump, second connector (12) are installed the inside of cross head (2), just second connector (12) are located locating part (3) with between axle bush (4), works as connecting rod (1) are close to when axle bush (4) direction moves, second connector (12) be used for with axle bush (4) butt, works as connecting rod (1) are close to when the direction of fracturing pump moves, second connector (12) be used for with locating part (3) butt.

2. The connecting structure of a connecting rod and a cross head according to claim 1, wherein the cross head (2) is a split structure, the cross head (2) comprises an upper structure and a lower structure, and the upper structure and the lower structure are detachably connected.

3. The connecting structure of a connecting rod and a cross head according to claim 2, wherein the arc-shaped groove is opened between the upper structure and the lower structure.

4. The connecting structure of the connecting rod and the cross head according to claim 1, wherein the cross head (2) is of an integral structure, and the cross head (2) is provided with a process hole (21).

5. The connecting structure of the connecting rod and the cross head according to claim 1, wherein the bearing bush (4) is arc-shaped, and two ends of the bearing bush (4) are used for abutting against the limiting piece (3).

6. The connecting structure of a connecting rod and a cross head according to claim 1, wherein the limiting piece (3) comprises a first pressing block (31) and a second pressing block (32), the first pressing block (31) and the second pressing block (32) are connected to the inside of the cross head (2) at intervals, the second connecting head (12) is located between the first pressing block (31) and the second pressing block (32), and when the connecting rod (1) moves towards a direction approaching the fracturing pump, the second connecting head (12) is used for being abutted with the ends of the first pressing block (31) and the second pressing block (32).

7. The connecting structure of the connecting rod and the cross head according to claim 6, wherein the end portion of the first pressing block (31) and the end portion of the second pressing block (32) which are used for being in contact with the second connecting head (12) are provided with cambered surface structures which are matched with the shape of the second connecting head (12).

8. The connecting structure of a connecting rod and a cross head according to claim 1, further comprising a threaded connecting piece (5), wherein a first threaded hole is formed in the limiting piece (3), a second threaded hole matched with the first threaded hole is formed in the cross head (2), and the threaded connecting piece (5) is used for penetrating through the first threaded hole and being connected with the second threaded hole so as to fix the limiting piece (3) on the cross head (2).

9. Connecting structure of a connecting rod and a cross head according to any of claims 1-8, characterized in that the connecting rod (1) is of one-piece forged construction.

10. A fracturing pump comprising a connecting structure of a connecting rod and a cross-head according to any one of claims 1 to 9.