Flame guide sleeve of radiant tube burner

The utility model discloses a flame guide sleeve of a radiant tube burner. The flame guide sleeve comprises a heat-resistant guide sleeve main body and a support, the diameter of one end of the heat-resistant guide sleeve main body is slightly smaller than that of the other end; the supports are columnar and are uniformly distributed and welded at the periphery of one side of the heat-resistant guide sleeve body, which is slightly larger than the diameter; according to the burner flame guide sleeve, production halt caused by damage and scrapping of the radiant tube due to deformation and cracking of the root of the radiant tube due to uneven local high temperature of the inner wall of the radiant tube is effectively avoided; the service life and the production period of the radiant tube are prolonged, the maintenance is reduced, and the production efficiency is improved; the guide sleeve is simple in structure, easy to manufacture, good in universality, capable of being widely appliedto radiant tube nozzles a