| 摘要 |
A device for preventing air from flowing into a furnace through a blow pipe is provided to prevent outside air from flowing into a furnace as an air port is closed by spreading a fan film in a radial direction inside the air port through the control of the handle. A device for preventing air from flowing into a furnace through a blow pipe comprises: a shaft(100) having a front end passing through a blow pipe and a rear end being positioned on the air port of the furnace; a hollow pipe(200) having the same axis center as the shaft and being positioned within the blow pipe; a rotary control part(300) being connected to the leading end of the shaft and being installed at the outer side of the blow pipe and the leading end of the hollow pipe; and a shielding part(400) being connected to the rear end of the shaft and being installed at the rear end of the hollow pipe. The rotary control part comprises a flange(320), a first bearing(340), a screw rod(330) and a steering wheel(310). The shielding part comprises a first bearing casing(430) and a second bearing(420), a socket(410), a disk(440) and a fan film(450).
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