小型制冷压缩机全自动性能测试试验台研制

摘要

Aiming at the actual operation caused testing precision problem, this paper developed a set of automatic small refrigeration compressor performance test device based on the principle requirements of " second refrigerant electricity calorimeter method" of GB/T9098-1996, GB5773-2004. The test device includes the tested refrigeration system and measurement and control system. For improving the testing precision, the tested refrigeration system increases subcooler and auxiliary refrigeration, making the system response speed be improved significantly, having perturbation resistance strengthened. The measurement and control system adopts industrial control computer centralized control and processing, it can realize full-automatic continuous operations of 24 hours. The built test device works stably, measures quickly, and the condition control precision and refrigerating capacity control precision can be controlled within ±0.5%.%小型制冷压缩机测试系统的被测对象其实质是一个具有工况变化范围大、纯滞后、强耦合、大惯性和各种扰动并存的十分复杂的制冷循环,针对压缩机在实际运行中受多种复杂因素干扰而造成测试精度不高问题,研制了一套小型制冷压缩机全自动性能测试台.依据GB/T9098-1996,GB5773-2004的“第二制冷剂电量热器法”的原理要求,试验台包括被测制冷系统和测控系统两部分,为提高试验台的测试精度,该试验台制冷系统增加过冷器和辅助制冷,使系统响应速度得到显著改善,抗扰性得到加强；测控系统采用工业控制计算机集中控制和处理,可实现全自动24 h连续运转.建成的试验台工况稳定,测试速度快,工况控制精度和制冷量控制精度均可控制在±0.5％以内,实现了较高的控制精度.