发明授权
- 专利标题： Method of controlling the operation of a pump in a pumping installation by detecting counterflow
- 专利标题（中）： 通过检测逆流来控制泵送设备中的泵的操作的方法
-
申请号： US441639申请日： 1989-11-27
-
公开(公告)号： US5090872A公开(公告)日： 1992-02-25
- 发明人: Takao Kuwabara , Ezo Kita , Isao Yokoyama , Hiroto Nakagawa , Yasuteru Oono
- 申请人： Takao Kuwabara , Ezo Kita , Isao Yokoyama , Hiroto Nakagawa , Yasuteru Oono
- 申请人地址： JPX Tokyo JPX Osaka
- 专利权人： Hitachi Ltd.,The Kansai Electric Power Co., Inc.
- 当前专利权人： Hitachi Ltd.,The Kansai Electric Power Co., Inc.
- 当前专利权人地址： JPX Tokyo JPX Osaka
- 优先权： JPX63-298204 19881128
- 主分类号： F03B15/04
- IPC分类号： F03B15/04 ; F03B15/02 ; F03B15/08 ; F04B49/06 ; F04D15/00 ; F04D15/02
摘要：
A method of detecting a counterflow in a pump comprises providing with detecting means for detecting variations in the discharge pressure of the pump and signal analyzing means for analyzing oscillation components contained in an output signal from the pressure detecting means, and detecting the pump's operating point to have entered a counterflow characteristic operation region when a waveform of the detection signal generated in association with the variations in the discharge pressure of the pump exhibits a predetermined spectrum distribution. Further, when it is detected that the operating point enters a counterflow characteristic operation region, the escape from that region is performed by temporally throttling the guide vane and temporally increasing the rotating speed.
公开/授权文献
- US5573999A .beta.-substituted cinnamic acid derivative 公开/授权日：1996-11-12
信息查询
