Crosshead and connecting rod connecting assembly

Abstract

The invention discloses a crosshead and connecting rod connecting assembly which comprises a crosshead and a connecting rod, and the crosshead and the connecting rod are integrally formed. The crosshead and the connecting rod are designed to be of an integrated structure, the problem that in the prior art, when the crosshead and the connecting rod are connected in a separated mode, the crosshead and the connecting rod are not concentric due to a fit clearance is effectively solved, abrasion of a connecting rod sealing piece and a plunger packing sealing piece is remarkably reduced, and the service life of the device is prolonged. And through the integrated structural design, the crosshead and the connecting rod are connected without using a pressing ring and a fastener, so that the connecting structure is simplified, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of mechanical transmission technology, and in particular to a crosshead and connecting rod connection assembly. Background Technology

[0002] In reciprocating pumps, compressors, and other equipment driven by a crank-connecting rod mechanism, the core function of this mechanism is to convert the rotational motion of the prime mover (such as an electric motor) input shaft into the linear reciprocating motion of the crosshead and piston (or plunger), thereby enabling the operation of the fluid medium. In such equipment, the crosshead, as a key component connecting the connecting rod and the drive rod (connecting rod), directly affects the operating efficiency and reliability of the equipment due to the precision of its connection with the connecting rod.

[0003] like Figure 1 As shown, the traditional connection between the crosshead 1 and the connecting rod 2 mainly adopts two methods: one is to fix them by using a "stop-positioning" mechanism with the pressure ring 8 and fastener 9; the other is to directly screw the internal thread of the crosshead into the external thread at the end of the connecting rod. Both of these traditional structures have inherent fitting clearances, and are easily affected by factors such as uneven preload of the fasteners during assembly. In continuous high-speed, heavy-load reciprocating motion, these clearances and uneven forces will continue to intensify, and the concentricity of the crosshead and the connecting rod is easily reduced due to fretting wear or accumulated assembly errors.

[0004] This concentricity deviation is directly transmitted to the connected sealing system, causing uneven wear and contact between the connecting rod seal (located in the oil seal seat, such as an oil seal) and the plunger packing seal, ultimately leading to premature seal failure and media leakage. This not only severely affects the service life of the seals but also causes a decrease in equipment output, an increase in energy consumption, and threatens the long-term stability of the entire unit.

[0005] Therefore, in the field of reciprocating fluid machinery, how to fundamentally improve the connection structure between the crosshead and the connecting rod, eliminate the concentricity degradation caused by the fit clearance and assembly factors, and ensure that it always maintains a high degree of motion concentricity under dynamic loads has become a key technical issue for improving equipment reliability and reducing maintenance costs. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the existing technology, the purpose of the present invention is to provide a crosshead and connecting rod connection assembly, which solves the problem that the concentricity of the traditional crosshead and connecting rod connection is low, resulting in a decrease in the service life of the connecting rod seal or plunger packing seal.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0008] A crosshead and connecting rod connection assembly includes a crosshead and a connecting rod, wherein the crosshead and the connecting rod are integrally formed.

[0009] Furthermore, a wear-resistant tube is sleeved and fixed on the outer periphery of the connecting rod.

[0010] Furthermore, the wear-resistant tube is detachably sleeved on the outer periphery of the connecting rod.

[0011] Furthermore, a tool hole for easy disassembly is provided on the side of the wear-resistant tube away from the crosshead.

[0012] Furthermore, an O-ring is provided between the connecting rod and the wear-resistant tube.

[0013] Furthermore, the connection between the crosshead and the connecting rod forms an annular stepped surface with a diameter larger than that of the connecting rod; the crosshead and connecting rod connection assembly also includes a water-blocking ring, which is sleeved on the end of the connecting rod away from the crosshead, and its inner end face axially presses the end of the wear-resistant tube against the annular stepped surface.

[0014] Furthermore, the water-blocking ring is threadedly connected to the connecting rod.

[0015] Furthermore, the crosshead and the connecting rod are formed by integral casting or integral forging followed by machining.

[0016] Furthermore, the connection between the crosshead and the connecting rod has a concave arc-shaped transition portion.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The crosshead and connecting rod connection assembly disclosed in this invention fundamentally eliminates the mating clearance between the crosshead and the connecting rod by designing them as an integral structure, ensuring that they remain concentric under any operating conditions. This design significantly reduces the wear of the connecting rod seal and the plunger packing seal, greatly extending their service life and thus improving the stability and reliability of the equipment. At the same time, the integral structure eliminates the need for pressure rings and fasteners required by traditional connection methods, reducing the number of parts, simplifying the assembly process, and lowering production costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the crosshead and connecting rod connection assembly in the background technology.

[0020] Figure 2 This is a schematic diagram of the crosshead and connecting rod connection assembly of the present invention.

[0021] In the diagram, 1 is the crosshead, 2 is the connecting rod, 3 is the wear-resistant tube, 4 is the annular stepped surface, 5 is the water-blocking ring, 6 is the tool hole, 7 is the O-ring, 8 is the pressure ring, and 9 is the fastener. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and specific examples.

[0023] Example

[0024] This embodiment provides a crosshead and connecting rod connection assembly, including a crosshead 1 and a connecting rod 2, wherein the crosshead 1 and the connecting rod 2 are integrally formed.

[0025] The present invention integrates the crosshead 1 and the connecting rod 2, eliminating the fitting gap of traditional separate connections from the source. This ensures extremely high static and dynamic concentricity between the crosshead 1 and the connecting rod 2, thereby effectively solving the problem of low concentricity after the traditional crosshead 1 and connecting rod 2 are connected, which leads to a decrease in the service life of the connecting rod 2 seal or plunger packing seal.

[0026] In specific implementation, a wear-resistant tube 3 is sleeved and fixed on the outer periphery of the connecting rod 2.

[0027] The wear-resistant tube 3 can serve as a wear part, protecting the connecting rod 2 from wear and significantly extending the service life of the connecting rod 2.

[0028] In practice, the wear-resistant tube 3 is detachably sleeved on the outer periphery of the connecting rod 2.

[0029] The detachable design allows for easy individual replacement of the wear-resistant tube 3 after it wears out, greatly reducing maintenance costs and downtime.

[0030] In specific implementation, an annular stepped surface 4 with a diameter larger than that of the connecting rod 2 is formed at the connection between the crosshead 1 and the connecting rod 2; the crosshead and connecting rod connection assembly also includes a water-blocking ring 5, which is sleeved on the end of the connecting rod 2 away from the crosshead 1, and its inner end face axially presses the end of the wear-resistant tube 3 onto the annular stepped surface 4.

[0031] The water-retaining ring 5 provides reliable axial positioning for the wear-resistant tube 3, preventing it from shifting during reciprocating motion and ensuring the stability of the sealing interface.

[0032] In specific implementation, the wear-resistant tube 3 has a tool hole 6 on the side away from the crosshead 1 for easy disassembly.

[0033] Tool hole 6 provides a force point for disassembling wear-resistant tube 3, making the replacement operation simpler and safer.

[0034] In practice, the crosshead 1 and the connecting rod 2 are formed by integral casting or integral forging followed by machining.

[0035] The integral molding process ensures the continuity of the internal structure of the component and its high strength, and can achieve high-precision coaxiality between the crosshead 1 and the connecting rod 2 through a single clamping process.

[0036] In practice, the wear-resistant tube 3 is made of a corrosion-resistant, high-hardness material.

[0037] The corrosion-resistant and high-hardness material gives the wear-resistant tube 3 excellent wear resistance and resistance to media corrosion, further improving its durability under harsh working conditions.

[0038] In practice, the water-blocking ring 5 is threadedly connected to the connecting rod 2.

[0039] The threaded connection method has a simple and reliable structure, is easy to disassemble and assemble, and can finely adjust the axial preload of the wear-resistant tube 3 by adjusting the tightening depth.

[0040] In practice, an O-ring 7 is provided between the connecting rod 2 and the wear-resistant tube 3.

[0041] The O-ring 7 can effectively seal the gap between the connecting rod 2 and the wear-resistant tube 3, preventing lubricating oil from leaking out, thereby ensuring the reliability of the lubrication system and avoiding oil contamination of the working medium.

[0042] In specific implementation, the connection between the crosshead 1 and the connecting rod 2 has a concave arc-shaped transition portion.

[0043] The concave arc transition section can effectively disperse and reduce stress concentration at the connection between the crosshead 1 and the connecting rod 2, significantly improving the fatigue strength and overall service life of the integrated structure under alternating loads.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A connecting rod and crosshead assembly comprising a crosshead, a connecting rod, characterized in that, The cross head is integrally formed with the connecting rod.

2. The crosshead to rod connection assembly of claim 1, wherein, An outer periphery of the connecting rod is sleeved and fixed with a wear-resistant pipe.

3. The crosshead to rod connection assembly of claim 2, wherein, The wear-resistant pipe is detachably sleeved on the outer periphery of the connecting rod.

4. The crosshead to rod connection assembly of claim 2, wherein, A tool hole for facilitating disassembly is formed on a side of the wear-resistant pipe away from the cross head.

5. The crosshead to rod connection assembly of claim 2, wherein, An O-shaped sealing ring is arranged between the connecting rod and the wear-resistant pipe.

6. The crosshead to rod connection assembly of claim 2, wherein, An annular stepped surface with a diameter larger than that of the connecting rod is formed at a connecting position of the cross head and the connecting rod; the cross head and the connecting rod connecting assembly further comprises a water retaining ring, the water retaining ring is sleeved on an end of the connecting rod away from the cross head, and an inner side end face of the water retaining ring axially presses an end of the wear-resistant pipe on the annular stepped surface.

7. The crosshead to rod connection assembly of claim 6, wherein, The water retaining ring is threadedly connected with the connecting rod.

8. The crosshead to rod connection assembly of claim 1, wherein, The cross head and the connecting rod are integrally cast or forged and then machined.

9. The crosshead to rod connection assembly of claim 1 wherein, The connecting position of the cross head and the connecting rod has an arc-shaped transition portion concave inward.

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