| 摘要 |
<p>A drill tool includes a bit body, at least one bearing shaft extending from the bitbody and a cone mounted for rotation on the bearing shaft. A mechanical seal is disposed between the bearing shaft and the cone in a seal gland. The mechanical seal includes a rigid seal ring having a dynamic sealing surface with the cone and another non-sealing surface exposed to an aperture in the seal gland. The mechanical seal further includes at least one cooling channelformed in the another non-sealing surface of the rigid seal ring, the cooling channel having an open end in fluid communication with the aperture in the seal gland. [Fig. 5A]</p> |
