| 摘要 |
PURPOSE:To improve durability in a conveying passage, by making a fluid by a fluid generating means of a blower or the like circulate through an outer circumferential part of a fluid passage in a state of being rectified, while forming a staionary fluid layer, a vacuum layer and a high-speed fluid layer all in this fluid passage. CONSTITUTION:Air A to be fed out of a blower has flowed almost uniformly into each of air branch passages 7 by a head 3 and then it is fed to the side of a conveying pipe 22 after circulating through an air chamber 4. And, it is guided by the head 3 whereby a vacuum layer 31, a stationary fluid layer 33 being formed annularly along an inner circumferential surface 1C of a straight tubular body 1 and makes the air stay in a state of almost stationary, and a high-speed fluid layer 32 where the air circulates at high speed between both these layers. Properties of this fluid flow is maintained even inside the conveying pipe 22. And, an air flow circulating through the said high speed fluid layer 32 comes to a conveying fluid flow. That is to say, coal lumps 15 ride on the fluid layer 32 and conveyed in a state of being wrapped by the vacuum layer 31 and the stationary fluid layer 33 so that any damage to the conveying pipe 22 is prevented. |
