| 摘要 |
PURPOSE:To let a vane vary its angle by means of a form memory alloy action and a blast quantity adjustable without varying a speed of rotation in a motor and with no use of any accessory devices in addition, by making up a part of the vane with a form memory alloy. CONSTITUTION:Three blades 5 of a vane 4 are all made up of a form memory alloy. When room temperature goes up and reaches to X deg.C, each of these blades 5 varies its angle to the form once stored, namely, the form shown in an imaginary line (see illustration), and these blades 5 come so as to open with whereby a blast quantity increased as seen in illustration. When the room temperature is settled down to Y deg.C, each glade varies its angle again, returning to the original form, namely, the form shown in a full line in the illustration, therefore each opening angle of these blades 5 is made to come narrow so that the blast quantity decreases. With this constitution, each blade angle varies according to a temperature change, thus the blast quantity or the like is easily adjustable without altering a speed of rotation in a motor.
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