The development of small high purity gas driven booster pump involves many technological innovations in material structure and process. In order to solve the problems of wear, air tightness and self lubrication of high-speed piston and cylinder block under ultra-high pressure, we adopt special materials and processing technology.
For the cylinder block, mainly in order to improve its hardness and wear resistance, machining accuracy and surface finish, we choose high-strength substrate, adopt precision casting, high-precision turning method and metal surface mirror processing technology, and the cylinder body surface adopts special carbonitriding heat treatment process, which has excellent surface hardness, mechanical strength, machining accuracy, surface finish and surface finish Wear resistance and other technical indicators.
For the piston sealing components, the main measures are to improve the wear-resistant machining accuracy, self lubrication and proper toughness, especially to ensure the good sealing of ultra-high pressure gas under proper interference fit. At the same time, the piston seal assembly should have good self lubrication due to the high purity gas polluted by the lubricant. 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 processing technology of special-shaped cylinder block. Under the existing material and process conditions in China, in order to achieve good sealing of cylinder block and piston, it is necessary to increase the number of seals and interference with cylinder block. However, it will lead to the difficulty of lubricity, the decrease of working reliability, the shortening of service life, the sudden increase of heat generated by the equipment, and even the combustion of related parts and equipment in serious cases.
With the replaceable structure of replaceable parts, after the cylinder block and piston body become tapered, the cylinder block and piston head will contact, collide and squeeze in the process of movement. Due to the structure and material, the high pressure cylinder block contacts under the action of ultra-high pressure and friction high temperature. Parts will wear out quickly.
Because the cylinder block and the piston head are in contact with the piston head and do not contact with the seal assembly and match with the seal assembly, the process requirements are relatively low, and this part can be separated from other parts. The cylinder block and cylinder block are separately processed into replaceable parts.
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