共查询到20条相似文献,搜索用时 125 毫秒
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介绍了内燃机密封用氟橡胶涂料的制备方法,讨论了成膜物(生胶)、溶剂、硫化剂、吸酸剂、补强剂及其他助剂的选用对涂层性能的影响,获取了较佳的生产工艺及配方。用此种氟橡胶涂料生产的氟橡胶涂层垫片,可满足内燃机发动机的工况要求。 相似文献
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安化集团公司供水车间8台循环水泵担负着向全厂提供冷却用循环水的任务,其轴封填料一直使用传统的石墨石棉盘根材料,平均两个月更换1次,每年更换1次轴套,这在一定程度上限制了水泵的长周期运行。由于泵的进出口蝶阀和出口单向阀内漏,填料得不到及时更换,直接影响了泵的正常运行,严重威胁到公司的安全、稳定、长周期生产。通过选用新型密封填料和改造填料密封结构,提高了泵的密封可靠性,从根本上解决了填料密封寿命短的问题,使循环水泵能长周期运行。 相似文献
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介绍了橡胶波纹管机械密封的结构及材料的选用,并以Φ35mm橡胶波纹管为例,通过实测波纹管弹力、理论计算、型式试验以及用户的工业性考核,表明了该密封是一种结构新颖,密封性能优良的新型稀酸泵用轴封。 相似文献
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与石油化工流程泵的选用不同,离心式消防水泵的选用自成体系,涉外项目消防水泵的选择通常要求遵守NFPA 20标准.简要介绍了消防水泵及其驱动机、控制系统的选型要求,介绍了相关消防产品的认证,以及工程设计中所遇到的相关问题. 相似文献
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Amstutz P Koch H Binz HK Deuber SA Plückthun A 《Protein engineering, design & selection : PEDS》2006,19(5):219-229
We describe here the rapid selection of specific MAP-kinase binders from a combinatorial library of designed ankyrin repeat proteins (DARPins). A combined in vitro/in vivo selection approach, based on ribosome display and the protein fragment complementation assay (PCA), yielded a large number of different binders that are fully functional in the cellular cytoplasm. Ribosome-display selection pools of four successive selection rounds were examined to monitor the enrichment of JNK2-specific DARPins. Surprisingly, only one round of ribosome display with subsequent PCA selection of this pool was necessary to isolate a first specific binder with micromolar affinity. After only two rounds of ribosome-display selection followed by PCA, virtually all DARPins showed JNK2-specific binding, with affinities in the low nanomolar range. The enrichment factor of ribosome display thus approaches 10(5) per round. In a second set of experiments, similar results were obtained with the kinases JNK1 and p38 as targets. Again, almost all investigated DARPins obtained after two rounds of ribosome display showed specific binding to the targets used, JNK1 or p38. In all three selection experiments the identified DARPins possess very high specificity for the target kinase. Taken together, the combination of ribosome display and PCA selections allowed the identification of large pools of binders at unparalleled speed. Furthermore, DARPins are applicable in intracellular selections and immunoprecipitations from the extract of eukaryotic cells. 相似文献
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