Flexible pipe and exhaust heating system with the same

A flexible pipe comprising:

• a plurality of fixed sections having a double pipe structure with a predetermined length and a straight shape;
• and
• at least one flexible section provided between the fixed sections and configured to be variable in length and shape, wherein
• the flexible section is provided as a triple structure including an outer bellows pipe having a corrugated pipe shape having peaks and valleys, an inner bellows pipe provided inside the outer bellows pipe, and an interlock pipe provided inside the inner bellows pipe,
• a heater is installed on an outer surface of an inner pipe of the fixed section having the double pipe structure in a fixed section applied to an input end connected to a vacuum pump among the fixed sections to intensively supply heat, and
• a pressure space is formed at a preset pressure in the fixed section and the flexible section after inserting and sublimating dry ice to shorten a heating time of an internal temperature and expand a holding time for allowing the internal temperature to be maintained and a cooling time for allowing the internal temperature to be decreased.