| 摘要 |
PROBLEM TO BE SOLVED: To enhance delivery efficiency, by preventing a backflow phenomenon of a wet material to the hopper side from the delivery pipe side caused by back pressure in a force feed spraying method of the wet material and a force feed pump. SOLUTION: In the force feed pump for forcibly feeding the wet material, a pair of plunger pumps P and M for sucking and delivering the wet material, are arranged in parallel by connecting to an opening part bored in a sliding plate 15 as the force feed pump. A piston type force feed pump is used for synchronously reciprocating the sliding plate 15 with the pair of plunger pumps P and M. A pitch Q of cylinders 14 and 14a of the plunger pumps P and M is set substantially two times or two times or more the inner diameter of the cylinders 14 and 14a. A communicating state of a delivery pipe and a suction pipe with the cylinders interposed is generated a little, or the communicating state of the delivery pipe and the suction pipe with the cylinders interposing is not generated. COPYRIGHT: (C)2006,JPO&NCIPI
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