Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor
Patent
1989-02-17
1990-07-03
Smith, Leonard E.
Pumps
Condition responsive control of pump drive motor
By control of electric or magnetic drive motor
F04B 4902
Patent
active
049386638
ABSTRACT:
A compressor which is provided with a safety device so that it is possible to detect occurrence of a primary accident, for example, breakage of a connecting rod, in the early stage. The compressor has a pressure sensor installed at a predetermined position in the compressor to detect the level of pressure at that position, a memory means for storing the behavior of the pressure change at the predetermined position that is obtained when the compressor is running in a normal state, a means for judging the behavior of the pressure change actually taking place at the predetermined position on the basis of an output from the pressure sensor and making a comparison between the actual pressure change behavior and the pressure change behavior in the normal state that is stored in the memory means, and a means for suspending the compressor when the actual pressure change behavior is different from the pressure change behavior in the normal state. Thus, it is possible to reliably prevent occurrence of a secondary accident which may invite a serious accident and hence possible to enhance the safety and reliability of the compressor.
REFERENCES:
patent: 2946203 (1960-07-01), Carver
patent: 4077747 (1978-03-01), Burenga
patent: 4676914 (1987-06-01), Mills et al.
patent: 4756669 (1988-07-01), Hata
German Journal: "Industriekurier", No. 149 of Sep. 27, 1961, p. 614.
Kanoh Gen
Mitsuhashi Hiroshi
Odagiri Akiharu
Sakamoto Susumu
Ushiota Harutsugu
Scheuermann David W.
Smith Leonard E.
Tokico Ltd.
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