| 摘要 |
This invention comprises high temperature fan apparatus for use in displaci ng high-temperature gases and atmospheres, such as the atmosphere within a high - temperature furnace. The fan apparatus is configured to limit heat transfer through the fan apparatus without the need for separate fan-cooling apparatus thereby preventing bearing damage and generally increasing the fan's operational life. The preferred fan includes a frame supporting the fan. One or more bearings rotatably support a fan shaft. A fan element is supported by the fan shaft. The fan element may be within the furnace interior. Heat transfer through the fan and fan shaft is limited by at least one bore positioned in at least a portion of the fan shaft. Heat transfer throug h the fan is further limited by thermal barrier material secured with respect to the fram e. Oversized bearing structure may additionally be provided to further limit he at transfer from the fan shaft to the bearings.
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