Density control monitor with opposing bellows

Details Density control monitor with opposing bellows Density control monitor with opposing bellows

1976-01-09

1977-11-08

Tolin, Gerald P.

Electricity: circuit makers and breakers

Fluid pressure

Diaphragm

200 815, 340242, 73393, 137557, H01H 3532

Patent

active

040576990

ABSTRACT:
A monitor for maintaining an atmosphere of gaseous sulfur hexafluoride supplied to the chamber of an outdoor circuit breaker at a predetermined density, which is to be kept constant, comprising a switch or valve operable to connect the chamber to a source of gaseous sulfur hexafluoride at said density and to disconnect it therefrom and a sensing device comprising a constant volume tube in the chamber filled with gaseous sulfur hexafluoride at the same density as that in the chamber, a compressible bellows in the tube filled with oil, a pair of opposed cascaded bellows supporting an actuator in operable relation to the switch or valve so as to maintain the switch or valve in a neutral position for any change in ambient temperature and wherein a decrease in pressure within the chamber will cause the switch or valve to be operated to supply gas pressure to the chamber.

REFERENCES:
patent: 2092560 (1937-09-01), Runaldue
patent: 2187346 (1940-01-01), Grace
patent: 2480495 (1949-08-01), MeJean
patent: 2825781 (1958-03-01), Mitchell
patent: 2849577 (1958-08-01), Pfeiffer
patent: 2894392 (1959-07-01), McLaughlin

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