A compressor piston rod and crosshead connection structure

Abstract

This utility model discloses a compressor piston rod and crosshead connection structure, aiming to improve the coaxiality and perpendicularity of the connection and enhance the reliability of the hydraulic connection. The technical solution includes: the piston rod and crosshead are directly connected by threads, with a stepped locking stop between them; a hydraulic piston, a hydraulic nut, and a spherical washer are sequentially fitted onto the piston rod from top to bottom, with the lower spherical surface of the hydraulic nut engaging with the spherical washer for alignment; the hydraulic piston and hydraulic nut slide together to form a sealed hydraulic chamber, with a hydraulic oil inlet and a plugged exhaust port at the upper end; a locking nut connected by an outer thread abuts against the hydraulic nut. This structure eliminates assembly errors through the locking stop, automatically aligns itself with the spherical fit, and ensures stable pressure delivery through the exhaust structure, effectively preventing piston rod bending, seizing, and breakage.

Description

Technical Field

[0001] This utility model relates to an improved invention of a reciprocating compressor, and more particularly to an improved invention of a compressor piston rod and crosshead connection structure. Background Technology

[0002] The hydraulic connection structure between the piston rod and the crosshead of a reciprocating piston compressor is quite common. However, according to statistics from actual use, due to insufficient machining tolerances (coaxiality and perpendicularity) or improper assembly, failures or accidents often occur, including: the piston rod and the crosshead (or hydraulic nut) seizing together, and in severe cases, even piston rod breakage. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a connection structure between the piston rod and the crosshead of a compressor, improve the coaxiality and perpendicularity of the connection between the piston rod and the crosshead, and ensure the reliability of the hydraulic connection structure.

[0004] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: The compressor piston rod and crosshead connection structure includes a piston rod and a crosshead, characterized in that: the piston rod and the crosshead are connected by threads, and a piston rod screw-in stop is provided between them; a hydraulic piston, a hydraulic nut, and a spherical washer are sequentially sleeved on the piston rod from top to bottom, the spherical washer is pressed between the hydraulic nut and the crosshead, the lower end of the hydraulic nut is spherical, and the spherical surface and the spherical washer are aligned and fitted; the hydraulic piston is axially extendable and retractable on the upper end of the hydraulic nut, and the lower end of the hydraulic piston and the upper end of the hydraulic nut maintain a sealed contact and form a hydraulic cavity; the upper end of the corresponding hydraulic piston is provided with a hydraulic oil inlet and an exhaust port communicating with the hydraulic cavity, the exhaust port is equipped with a plug; the piston rod is provided with an upper limit structure for the hydraulic piston; a locking nut is threadedly connected to the outer circle of the hydraulic piston, and the lower end of the locking nut abuts against the upper end of the hydraulic nut.

[0005] The lower end of the hydraulic piston and the upper end of the hydraulic nut are respectively provided with concave cavities, and the two are slidably sleeved together. A sealing ring is provided on the sleeve surface, and the corresponding concave cavity forms the hydraulic cavity.

[0006] The piston rod screw-in stop is a limiting step that is matched and set on the outer circle of the piston rod and the inner hole of the crosshead.

[0007] The beneficial effects of this utility model are the improved connection structure between the compressor piston rod and the crosshead: 1. Direct threaded connection and stop positioning: The piston rod and the crosshead are directly threaded together, and a stop is provided at the bottom for the piston rod to screw into. The coaxiality is guaranteed by the machining accuracy, eliminating the cumulative assembly error; 2. Spherical washer and hydraulic nut fit: The lower end of the hydraulic nut is provided with a spherical surface, which fits with the spherical washer pressed between the crossheads to guide and adjust the parallelism of the end faces automatically, preventing the piston rod from bending or tilting; 3. Sealed hydraulic chamber and exhaust structure: The hydraulic piston and the hydraulic nut slide together to form a sealed hydraulic chamber. The upper end is provided with a hydraulic oil inlet and an exhaust port with a plug to ensure that air is discharged during oil injection, improving the safety and stability of pressurization. Attached Figure Description

[0008] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0009] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0010] The accompanying drawings illustrate the structure of this utility model, and further details will be described below with reference to the drawings. In this embodiment, see the attached drawings. Figure 1 The compressor piston rod and crosshead connection structure includes a piston rod 1 and a crosshead 2, which are connected by threads, and a piston rod 1 screw-in stop 3 is provided between them. A hydraulic piston 4, a hydraulic nut 5, and a spherical washer 6 are sequentially mounted on the piston rod 1 from top to bottom. The spherical washer 6 is pressed between the hydraulic nut 5 and the crosshead 2. The lower end of the hydraulic nut 5 is spherical, and this spherical surface is aligned with the spherical washer 6. The hydraulic piston 4 is axially extendable and retractable on the hydraulic nut 5. The lower end of the hydraulic piston 4 and the upper end of the hydraulic nut 5 are in sealed contact and form a hydraulic cavity 7. The upper end of the hydraulic piston 4 is provided with a hydraulic oil inlet 8 and an exhaust port 9 that connect to the hydraulic cavity 7. The exhaust port 9 is equipped with a plug 10. Preferably, the plug 10 is threadedly connected to the exhaust port 9. The piston rod 1 is provided with an upper limit structure for the hydraulic piston 4. Preferably, the upper limit structure is a step on the piston rod 1. A locking nut 11 is threadedly connected to the outer circle of the hydraulic piston 4. The lower end of the locking nut 11 abuts against the upper end of the hydraulic nut 5.

[0011] As a further improved specific implementation, the lower end of the hydraulic piston 4 and the upper end of the hydraulic nut 5 are respectively provided with concave cavities, and the two are slidably sleeved together. A sealing ring 12 is provided on the sleeve surface, and the corresponding concave cavity forms the hydraulic cavity 7.

[0012] As a further improved specific implementation, the piston rod 1 is screwed into the stop 3, which is a limiting step that is matched and set on the outer circle of the piston rod 1 and the inner hole of the crosshead 2.

[0013] The working principle of this invention is as follows: the piston rod 1 and the crosshead 2 are directly threaded together, and the piston rod 1 is screwed into the stop 3 for limiting, ensuring coaxiality. Based on the characteristics of gas being compressible and liquid being incompressible, hydraulic oil is injected into the hydraulic chamber 7 through the hydraulic oil inlet 8. Before injecting oil, the vent port 9 and plug 10 are opened to expel air, ensuring that the chamber is filled with hydraulic oil. During pressurization, the hydraulic piston 4 extends and retracts axially to push the hydraulic nut 5, which automatically aligns with the spherical washer 6. Then, the locking nut 11 is tightened, causing the crosshead 2 to bear force, achieving a precise and stable connection between the piston rod 1 and the crosshead 2, avoiding seizing or breakage caused by stress concentration.

[0014] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A compressor piston rod and crosshead connection structure, comprising a piston rod and a crosshead, characterized in that: The piston rod and the crosshead are connected by threads, and a piston rod screw-in stop is provided between them. A hydraulic piston, a hydraulic nut and a spherical washer are sequentially fitted on the piston rod from top to bottom. The spherical washer is pressed between the hydraulic nut and the crosshead. The lower end of the hydraulic nut is spherical, and the spherical surface is aligned with the spherical washer. The hydraulic piston is axially telescopic and is located on the upper end of the hydraulic nut. The lower end of the hydraulic piston and the upper end of the hydraulic nut maintain a sealed contact and form a hydraulic cavity. The upper end of the hydraulic piston is provided with a hydraulic oil inlet and an exhaust port that connect to the hydraulic cavity. The exhaust port is equipped with a plug. The piston rod is provided with an upper limit structure for the hydraulic piston. A locking nut is threaded on the outer circle of the hydraulic piston, and the lower end of the locking nut abuts against the upper end of the hydraulic nut.

2. The compressor piston rod and crosshead connection structure as described in claim 1, characterized in that: The lower end of the hydraulic piston and the upper end of the hydraulic nut are respectively provided with concave cavities, and the two are slidably sleeved together. A sealing ring is provided on the sleeve surface, and the corresponding concave cavity forms the hydraulic cavity.

3. The compressor piston rod and crosshead connection structure as described in claim 1, characterized in that: The piston rod screw-in stop is a limiting step that is matched and set on the outer circle of the piston rod and the inner hole of the crosshead.

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