The invention relates to the technical field of X-
ray tubes, and discloses a reflective X-
ray tube cooling mechanism. The reflective X-
ray tube cooling mechanism comprises a
glass cover, an
anode target and a cooling cover, wherein the top end of the
glass cover is provided with an expansion cover at the position corresponding to the
anode target, the expansion cover is located in the cooling cover, and a heat conduction
crystal evaporated by heating is placed at the inner bottom of the expansion cover. According to the invention, the top end of the
glass cover is provided with the expansion cover at the position corresponding the
anode target in the cooling cover, the heat conduction
crystal is placed at the inner bottom of the expansion cover, the characteristic that
thermal decomposition of the heat conduction
crystal is
reversible reaction is utilized, the heat generated by the anode target is absorbed, the gas generated by
thermal decomposition of the anode target rises to an upper space in the expansion cover, is cooled by circulating water in the cooling cover and then is subjected to
chemical combination reaction for
crystallization, and the circulation can diffuse the heatdissipation area to the surface of the whole expansion cover on the basis of the original heat dissipation area, so that the heat dissipation area can be greatly increased.