The design of the piston rod with anti-rotation structure includes the piston rod mechanism, piston seat and limit block. By setting the limit block inside the piston seat and equipping with a movable shaft and torsion spring, when the front end of the locking pin and the front end of the limit block are in contact with each other, it can be locked by extrusion to prevent the piston rod from rotating and ensure the stability of the piston rod in use.

Structural characteristics and application scenarios
This type of piston rod with anti-rotation structure is suitable for special processing requirements where the rotation of the piston rod needs to be prevented. At the same time, the structure is simple, the processing is convenient, the processing efficiency is improved, and the processing cost is reduced by 4.

Manufacturing method of piston rod protection structure
Finally, there is also a manufacturing method of the piston rod protection structure, which involves the technical field of compressor accessories 5. This protection structure effectively improves the service life and protection effect of the piston rod through specific design and material selection.

Background technology and application prospects
The commonly used sealing device in reciprocating compressors is packing seal, a dynamic sealing device that generates compressive force between the packing and the rotating and fixed parts through pre-tightening or the self-tightening effect of the medium pressure 5. The manufacturing method of this protection structure is precisely based on such a technical background and market demand, aiming to improve the performance and reliability of the compressor. 

The design of the piston rod with protective structure has wide applications in multiple fields. Through different structures and material selections, it can meet different protection requirements and usage scenarios.