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一、序言在常温或中温流动水的条件下,进行热交换器管束管子和释热元件的振动应力测量时,遇到的主要问题是应变计的防水问题。常温指室温水流速约2.0米/秒。中温指水温约120℃流速约1.3米/秒.可供应变计防水方案有石腊松香、各种环氧树酯、有机硅橡胶、现购的水下应变计和各种机械密封等。这些方案一般适用于静水,不能满足中温及动水方面要求。国内虽有不少中高温应变计,但多数不防水,而水下应变计大多不耐温。针对我们所研究的是棒状结构,经一段时间试验,在热交换器水流振动现场测试工作中,成功地采用了在常温流动水中自粘
I. Preface The main problem encountered when measuring the vibrational stress of tube bundles and elements of heat exchangers under normal or moderate temperature flowing water conditions is the waterproofing of the strain gauge. Room temperature refers to room temperature water flow rate of about 2.0 m / sec. Medium temperature refers to the water temperature of about 120 ° C flow rate of about 1.3 m / s. Variety of water supply programs available paraffin rosin, all kinds of epoxy resin, silicone rubber, underwater strain gauges are now buy and a variety of mechanical seals. These programs are generally applicable to still water, can not meet the requirements of medium temperature and water. Although there are many domestic high-temperature strain gage, but most are not waterproof, and most of the underwater strain gauge temperature. For our study is a rod-shaped structure, after a period of time, in the field of heat exchanger water flow vibration test, the successful use of water at room temperature in the self-adhesive