| 摘要 |
884,066. Fluid actuation of switches. GENERAL ELECTRIC CO. March 24, 1960 [March 26, 1959], No. 10459/60. Class 38 (5). A switch is controlled by a piston whose face is exposed to the liquid in a yieldable chamber having one or more orifices, so that a gradual change of pressure outside the chamber has no effect upon the piston but a sudden rise of external pressure causes the piston to operate the switch. In the embodiment described, the switch housing 10 is bolted to the side 21 of an oil-filled transformer casing. A rise in pressure of the oil due to heat generated during operation or to ambient temperature changes compresses a spring-loaded bellows 60 and forces silicone oil contained therein out through orifices 28 and into an upper chamber 15 via an aperture 46. A sudden pressure increase in the transformer casing due, e.g. to arcing compresses the bellows 60 sufficiently rapidly to raise the piston 30 and operate the switch 33. The sensitivity of the device may be adjusted by means of a nut 67, and the device may be mounted if desired in communication with the gas at the top of the transformer casing. |
