Hot oil-type tubular heater

The utility model discloses a hot oil-type tubular heater which comprises a pipe shell, a pipe joint, ingress pipes, return pipes, a heat medium and sensors, wherein the pipe shell adopts a jacket pipe structure; a built-in axial inner pipe is arranged in the center of the pipe shell; the outer pipe wall of the pipe shell is in sleeving fit with the inner pipe in a coaxial manner; two ends of the outer pipe wall and those of the inner pipe are connected in a sealed manner; the outer pipe wall comprises a truncated cone and a cylinder; the small end of the truncated cone takes the inner pipe as a starting point; a thread is formed in the socket section of the cylinder at the other end, and is matched with the pipe joint, so as to form positioning mounting; the ingress pipes and the return pipes are connected to the inner pipe of the end surface ring of the socket section of the pipe shell alternately at same intervals in a sealed manner; the heat medium flows in a circular flow passage including the ingress pi