The utility model relates to the technical field of bearing
lubrication, and discloses a high-temperature and high-speed rotary joint for thin oil circulation
lubrication and cooling, which comprises an
elbow, a shell, a bearing box, an end cover, a rotor and an inner
pipe, a heat insulation sleeve is arranged in the rotor, an end
face seal I is arranged in the end cover, an end
face seal II is arranged in the end cover, and the inner
pipe is arranged in the shell. A first
tapered roller bearing is arranged in the bearing box, a positioning ring is arranged in the bearing box, a second
tapered roller bearing is arranged in the bearing box, a mounting
assembly is arranged in the bearing box, a first
graphite ring is fixedly connected to the outer portion of the rotor, and a second
graphite ring is fixedly connected to the outer portion of the rotor. And the outer part of the rotor is fixedly connected with a corrugated
pipe. According to the utility model, the inner ring is fixed on the rotor, when the temperature rises, the bearing component expands, the outer rings of the two bearings move inwards, and the spring II compensates the axial variation caused by the expansion of the bearings, so that the bearings return to normal.