Reinforced connecting rod crosshead structure for fracturing pump

Abstract

The utility model relates to the technical field of petroleum and natural gas drilling equipment and engineering, and particularly discloses a reinforced connecting rod crosshead structure for a fracturing pump, which comprises a connecting rod, a crosshead, a connecting rod pin and a connecting rod seat, the connecting rod small head is fixedly connected with the connecting rod pin through a fastener, a cavity is formed between the connecting rod small head and the connecting rod pin, a positioning pin is arranged in the cavity, the connecting rod small head is in an arc shape, a lining is fixedly arranged in the crosshead, the lining is arranged on the outer side of the connecting rod pin in a sleeving mode, and the connecting rod pin can rotate relative to the lining. The connecting rod pin replaces a traditional connecting rod small head to rotate in the crosshead so as to bear the pressure of the plunger, the connecting rod pin and the connecting rod pin bush have a larger contact area, and therefore the contact pressure is reduced, the connecting rod small head is in an arc shape, the machining requirement for high coaxiality does not exist, and the machining difficulty and the machining cost are reduced.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas drilling equipment and engineering technology, and in particular to a reinforced connecting rod crosshead structure for fracturing pumps. Background Technology

[0002] In the commonly used connecting rod crosshead structure of fracturing pumps, the small end of the connecting rod is an integral ring structure with a grooved spherical ring on the outer circle. In order to ensure the design strength of the small end of the connecting rod, the machining process must ensure that the outer ring and the inner circle are coaxial, which is relatively complex and costly.

[0003] Low-horsepower pumps have lower strength requirements for the connecting rod small end and do not require a connecting rod small end with a complex structure and high coaxiality. Existing connecting rod small ends have excessively high machining precision and high machining costs for low-horsepower pumps.

[0004] Therefore, it is necessary to propose a reinforced connecting rod crosshead structure for fracturing pumps to specifically adapt to low-horsepower pumps and reduce processing costs. Utility Model Content

[0005] The purpose of this invention is to solve the problem that the small end of the connecting rod in the existing connecting rod crosshead structure has a high processing cost for low-horsepower pumps. A reinforced connecting rod crosshead structure for fracturing pumps is provided.

[0006] The technical solution of this utility model is:

[0007] A reinforced connecting rod crosshead structure for fracturing pumps includes a connecting rod, a crosshead, a connecting rod pin, and a connecting rod seat. The connecting rod pin is located inside the crosshead. The two ends of the connecting rod are a large end and a small end, respectively. The small end of the connecting rod is fixedly connected to the connecting rod pin by fasteners. A cavity is provided between the small end of the connecting rod and the connecting rod pin, and a positioning pin is provided in the cavity. The small end of the connecting rod is arc-shaped. A bushing is fixed inside the crosshead and is sleeved on the outside of the connecting rod pin. The connecting rod pin can rotate relative to the bushing.

[0008] Furthermore, the connecting rod pin has four symmetrically distributed threaded holes, and fasteners are installed in the threaded holes to fix the connecting rod pin to the small end of the connecting rod.

[0009] Furthermore, the connecting rod big end is a flange-type split structure, and the connecting rod big end is installed and fixed to the connecting rod seat by bolts and nuts.

[0010] Furthermore, the small end of the connecting rod is a one-third arc shape.

[0011] The reinforced connecting rod crosshead structure for fracturing pumps of this invention, compared with traditional technology, uses a connecting rod pin instead of the traditional connecting rod small end to rotate within the crosshead to withstand the plunger pressure. It has a larger contact area with the connecting rod pin bushing, thereby reducing the contact pressure. In addition, the connecting rod small end is arc-shaped, so there is no high coaxiality machining requirement, which reduces the machining difficulty and cost. Attached Figure Description

[0012] Figure 1 This is the front view of the present utility model;

[0013] Figure 2 This is a perspective view of the connecting rod and connecting rod pin assembly of this utility model;

[0014] Figure 3 This is a cross-sectional view of the connecting rod and connecting rod pin of this utility model.

[0015] Reference numerals in the attached diagram: 1. Small end of connecting rod; 2. Crosshead; 3. Connecting rod pin; 4. Connecting rod seat; 5. Fastener; 6. Large end of connecting rod; 7. Cavity; 8. Locating pin; 9. Bushing. Detailed Implementation

[0016] To make the technical means, technical features, utility model purpose and technical effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations.

[0017] Example 1:

[0018] like Figure 1 and Figure 2 As shown, this embodiment provides a reinforced connecting rod crosshead structure for fracturing pumps, including a connecting rod, a crosshead 2, a connecting rod pin 3, and a connecting rod seat 4. The connecting rod pin 3 is located inside the crosshead 2. The two ends of the connecting rod are a large end 6 and a small end 1, respectively. The small end 1 and the connecting rod pin 3 are fixedly connected by fasteners 5. A cavity 7 is provided between the small end 1 and the connecting rod pin 3. Figure 3 As shown, a positioning pin 8 is provided inside the cavity 7, and the small end 1 of the connecting rod is arc-shaped, which is convenient for processing and manufacturing.

[0019] A bushing 9 is fixed inside the crosshead 2. The bushing 9 is sleeved on the outside of the connecting rod pin 3. The connecting rod pin 3 can rotate relative to the bushing 9. The bushing 9, which should have been installed inside the small end 1 of the connecting rod, is installed and fixed inside the crosshead 2 in this application. It has a window hole for the installation of the connecting rod and the connecting rod pin 3 and does not rotate with the connecting rod.

[0020] Preferably, the connecting rod pin 3 has four symmetrically distributed threaded holes, and the fastener 5 is installed in the threaded holes to fix the connecting rod pin 3 to the small end 1 of the connecting rod. Unlike the general connecting rod crosshead structure, the connecting rod pin 3 and the small end 1 of the connecting rod are fixed to each other and rotate with the small end 1 of the connecting rod.

[0021] Preferably, the connecting rod big end 6 is a flange-type split structure, and the connecting rod big end 6 is installed and fixed to the connecting rod seat 4 by bolts and nuts, which facilitates processing and assembly.

[0022] Preferably, the small end 1 of the connecting rod is a one-third arc shape, which facilitates processing and manufacturing, and reduces processing difficulty and cost.

[0023] In use, the connecting rod small end 1 is changed from a typical complete ring structure to a one-third circumference for easier machining. The connecting rod pin 3 has four symmetrical screw holes for positioning with the connecting rod small end 1 via locating pins 8 and is fixed with bolts. After the connecting rod pin 3 is fixed to the connecting rod small end 1, it rotates with the connecting rod small end 1. The arc-shaped connecting rod small end 1 provides a larger contact area between the connecting rod pin 3 and the bushing 9 inside the crosshead 2, reducing contact pressure. The bushing 9 is fixed inside the crosshead 2 and has a window hole for mounting the connecting rod small end 1 and connecting rod pin 3, and does not rotate with the connecting rod. The connecting rod big end 6 is a flange-type split structure, installed with bolts to the connecting rod seat 4, which facilitates machining and assembly. While ensuring the connecting rod strength required for normal operation of the fracturing pump, it simplifies machining and saves costs.

[0024] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. All equivalent changes and modifications made in accordance with the scope of the claims of this utility model should fall within the technical scope of this utility model.

Claims

1. A reinforced connecting rod crosshead structure for a fracturing pump, comprising a connecting rod, a crosshead (2), a connecting rod pin (3), and a connecting rod seat (4), wherein the connecting rod pin (3) is located inside the crosshead (2), characterized in that: The two ends of the connecting rod are the big end (6) and the small end (1), respectively. The small end (1) and the connecting pin (3) are fixedly connected by fasteners (5). A cavity (7) is provided between the small end (1) and the connecting pin (3). A positioning pin (8) is provided in the cavity (7). The small end (1) is arc-shaped. A bushing (9) is fixedly provided in the crosshead (2). The bushing (9) is sleeved on the outside of the connecting pin (3). The connecting pin (3) can rotate relative to the bushing (9).

2. The reinforced connecting rod crosshead structure for fracturing pumps according to claim 1, characterized in that: The connecting rod pin (3) has four symmetrically distributed threaded holes, and the fastener (5) is installed in the threaded holes to fix the connecting rod pin (3) to the small end of the connecting rod (1).

3. The reinforced connecting rod crosshead structure for fracturing pumps according to claim 1, characterized in that: The connecting rod big end (6) is a flange-type split structure. The connecting rod big end (6) is installed and fixed to the connecting rod seat (4) by bolts and nuts.

4. The reinforced connecting rod crosshead structure for fracturing pumps according to claim 1, characterized in that: The small end of the connecting rod (1) is a one-third arc.

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