| 摘要 |
<p>The invention relates to a device for generating X-rays (69). The device comprises a source (5) for emitting electrons (65), a carrier (7) which is provided with a material (9) which generates X-rays as a result of the incidence of electrons, and a bearing (17) by means of which the carrier is journalled so as to be rotatable about anaxis of rotation (15). A first one (21) of the bearing members (21, 23) of the bearing is connected to the carrier. According to the invention, the device comprises a chamber (81) which is bounded by a heat transferring surface (89) of the carrier (7) and by a heat transferring surface (91) of the first bearing member (21). Said chamber is at least partially filled with a heat transferring material (85) which is liquid at an operational temperature of the device. Said liquid material is urged, during operation, towards both said heat transferring surfaces. In this manner, an additional heat transfer path is achieved from the carrier to the bearing (17) via said liquid heat transferring material. The rate of heat transfer via the additional heat transfer path is relatively high and independentof thermal deformations of the carrier and the first bearing member. In an embodiment of the device, the liquid heat transferring material (85) is urged towards the heat transferring surfaces (89, 91) under the influence of centrifugal forces exerted on the liquid material during rotation of the carrier(7). In another embodiment, the liquid material (111) is contained in a flexible envelope (113).</p> |
