Vertical type pipe-in-pipe structure

The utility model discloses a vertical type pipe-in-pipe structure which comprises an inner pipe, a middle pipe and an outer pipe. The inner pipe is sleeved with the middle pipe in a connected mode, the middle pipe is sleeved with the outer pipe in a connected mode, one side of the middle pipe is sequentially connected with a second welding concentric reducer, the clamp connector convex end, the clamp connector concave end, a sensor thermometer short pipe, a first welding concentric reducer and a sanitary connector, the position, close to the middle pipe, of the side wall of the sensor thermometer short pipe is connected with a sensor connector through a sensor connecting sleeve, and the position, close to the sanitary connector, of the side wall of the sensor thermometer short pipe is further connected with a thermometer sensor through a thermometer connecting sleeve. According to the vertical type pipe-in-pipe structure, the hot contact area of oil paint and water flow is increased, the length is shortened,