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一、前 言 近几年来,随着化学工业及炼钢工业设备的大型化,所采用的压缩机业已大容量化,而且向着高速、大功率方向发展,并要求效率高、安全可靠。 包括送风机在内的压缩机生产动向,昭和45（1970）年的生产台份是 338664台,产值为 757亿日元,而昭和48（1973）年时的生产台份是494066台,产值为1022亿日元,显示稳步增长。但是从48（1973）年9月开始,生产略有下降的趋势。离心式压缩机基本上是稳定的。
I. Introduction In recent years, with the large-scale chemical industry and steelmaking industrial equipment, the compressors used have been mass-produced and are moving toward high-speed and high-power. They also require high efficiency and safety. The production of compressors including blowers was 338664 units in Showa 45 (1970), with an output value of 75.7 billion yen, compared with 494,066 units in Showa 48 (1973) with an output value of 1022 Billion yen, showing steady growth. However, production began to decline slightly from September 48 (1973) onwards. Centrifugal compressors are basically stable.