| 摘要 |
PURPOSE:To keep off the cohesion of dust to an impeller and aim at a reduction in vibration and noise as well as a cut of time for maintenance and inspection, by cutting off at least either of a peripheral part at the main plate side of a vane or a main plate peripheral part located between vanes. CONSTITUTION:As shown in illustration, these parts where dust 1d has so far stuck to, such as an outlet curved part of a vane 1c and the peripheral part of a main plate 1a are cut off whereby they are made so as not to cause gummy substances and dust, flying in from an inlet and accumulated on their surfaces, to stick to them again. If doing like this, an air flow passage area in an output of the vane 1c is hard to be narrowed unlike the conventional case, and an air flow velocity in the vane 1c is almost the same degree as the initial one so that dust or dirt is hard to be accumulated on them owing to centrifugal force acting on the said flow velocity and dust. With this constitution, the air flow passage area between each of vanes is well secured in optimum conditions, and a drop in performance due to a secular change can be obviated, while since the sticking of dust onto an impeller comes smaller, the time required for maintenance and inspection is reduced to a great extent and, what is more, vibration and noise both are reduced. |
