| 摘要 |
<p>An air blower cooling device is for an overhead projector or similar optical equipment. It has a radial fan (3) inside the double end wall of the lamp housing to draw the warm air out of the housing while preventing light from passing through the fan. The radial fan is a large dia., low speed design for quiet operation. The air ducts do not pass directly through the double wall, as in the case of axial impellers, with no light loss. The radial fan operates at a high efficiency with low power and speed, and with a narrow profile.</p> |
