| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the following problems: an air flow is generated from a bearing toward an impeller fan due to a negative pressure when the impeller fan rotates, and lubricating grease leaks from a bearing part, thereby deteriorating reliability due to shortage of the lubricating grease in the bearing part. <P>SOLUTION: A seal plate 32 having an annular protruding section 31 is disposed between a rear shroud 12a of the impeller fan 12 and a frame front 10a. An annular bearing ring 30 is supported by the frame front 10a and comes into contact with the protruding section 31 of the seal plate 32. According to this, the air is prevented from flowing toward the impeller fan 12 by the sealing effect between the protruding section 31 and the bearing ring 30, to prevent leak of lubricating grease from the bearing 9. Improvement in fan efficiency and improvement in reliability of the bearing 9 can be thus attained. <P>COPYRIGHT: (C)2013,JPO&INPIT |
