The bushing in the plunger pump does not only protect one side, but protects the plunger and the pump body at the same time. The overall focus is more on protecting the precision and expensive plunger, while preventing the plunger from directly wearing the matching holes of the pump body.
1. The core logic of protecting the plunger
The plunger is the core precision moving component of the plunger pump. It has high hardness but is expensive to process. Once worn, it will directly affect the output accuracy and stability of the pump. The bushing is usually made of a material that is slightly lower in hardness but more wear-resistant than the plunger (such as bronze, wear-resistant alloy, modified engineering plastics). When the plunger slides in the bushing, the friction will be concentrated on the bushing, preventing the plunger surface from being scratched and abraded. This not only extends the service life of the plunger, but also maintains the dimensional accuracy of the plunger.
2. The role of protecting the pump body
The matching holes of the pump body are generally made of cast iron or aluminum alloy, and their hardness is lower than that of the plunger. If the plunger is allowed to directly rub against the pump body, the hole wall of the pump body will be quickly worn, causing the entire pump body to be scrapped. As an intermediate transition piece, the bushing separates the plunger and the pump body, avoiding direct hard friction between the two and protecting the integrity of the pump body's matching structure.
3. Additional advantages at the maintenance level
Bushings are low-cost wearing parts. After wear and tear, only the bushings need to be replaced separately to restore the pump's performance. There is no need to overhaul the pump body or replace expensive plungers, which greatly reduces equipment maintenance costs.