For the cylinder block, in order to improve its hardness and wear resistance, machining accuracy and surface finish, we select high-strength substrate, adopt precision casting, high-precision turning processing method and metal surface mirror processing technology, as well as special carbonitriding heat treatment process for cylinder body surface, which has excellent surface hardness, mechanical strength, machining accuracy, surface finish and Wear resistance and other technical indicators.
For piston seal components, it is mainly to improve the wear-resistant machining accuracy, self-lubricating property and proper toughness, especially under the appropriate interference fit to ensure the good sealing of ultra-high pressure gas. At the same time, because the lubricant pollutes the high purity gas, the piston seal assembly should have good self lubrication. We compared and tested hundreds of materials and used special processing technology to meet the above technical requirements.
There are great technical difficulties in the sealing of ultra-high pressure and strong gas by using the forming technology of special-shaped cylinder block. In order to achieve good sealing of cylinder block and piston, the number of seals and interference with cylinder block must be increased. However, this will lead to difficulties in lubricity, resulting in reduced reliability, shortened service life, and sudden increase in heat generated by the equipment, and even combustion of related components and equipment in severe cases.
With the replaceable structure of replaceable parts, the cylinder block and piston head will contact, collide and squeeze in the process of movement after the cylinder block and piston body become conical. Due to the structure and material, the high pressure cylinder block contacts under the action of ultra-high pressure and high temperature of friction. Parts wear quickly.
Since the cylinder block and piston head are in contact with the piston head and do not contact with the seal assembly and match the seal assembly, the process requirements are relatively low and this part can be separated from other parts. The cylinder block and are separately machined into replaceable parts.