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由于成型夹克保温管道中的夹克管与内钢管之间,无法实现刚性连接,因此,要保持夹克管与受热后的内钢管同步变形,就要使成型夹克保温管道中的内钢管与保温材料、保温材料与夹克管之间的接触面具有足够的抗剪切强度。在研究了“一步法”工艺生产的夹克、泡沫成型保温管道的热变形传递特性的基础上,探讨了夹克与泡沫之间接触面抗剪切强度测试方法,并使用自行设计的试验装置,测试了“一步法”和“管中管”法工艺生产的两种夹克、泡沫成型管道中夹克与泡沫之间接触面的抗剪切强度。同时指出,“管中管”工艺生产的保温管道的抗剪切强度,明显优于“一步法”生产的保温管道。
As the molded jacket insulation pipe between the jacket pipe and the inner pipe can not be rigidly connected, therefore, to keep the jacket pipe and the heated steel pipe synchronization deformation, it is necessary to shape the jacket pipe insulation pipe and insulation materials, The contact surface between the insulation material and the jacket tube has sufficient shear strength. Based on the study of the thermal deformation transfer characteristics of the jackets and foam-molded insulation pipes produced by the “one-step” process, the method for testing the shear strength of the interface between the jacket and the foam was discussed. Using the self-designed test equipment, Two kinds of jackets produced by the “one-step” and “tube-in-tube” processes, the shear strength of the interface between the jacket and the foam in a foam-formed pipe. At the same time, it is pointed out that the shear strength of the insulated pipe produced by the process of pipe-in-pipe is obviously better than that of the insulated pipe produced by the one-step method.