Electro-pneumatic signal converter

Details Electro-pneumatic signal converter Electro-pneumatic signal converter

1982-01-20

1984-04-17

Cohan, Alan

Fluid handling

Pressure modulating relays or followers

251129, F16K 3102, G05D 1600

Patent

active

044428545

ABSTRACT:
An electro-pneumatic signal converter for converting an electrical current signal into a pneumatic pressure, comprising a force balancing system where a magnetic force is balanced against a pneumatic force, consists of a coil (11) through which the electrical signal current flows, a magnetic circuit comprising a core (12) of ferromagnetic material disposed in the coil (11) with a nozzle chamber (14) with a mouth in the form of a nozzle (13) in one end of the core, a flapper (17) of ferromagnetic material over the nozzle and a link (16) of ferromagnetic material which closes the magnetic circuit between the flapper and the opposite end of the core, a feed line (19, 19A, 19B) for a constant flow of feed air into the nozzle chamber (14) and out again through the nozzle (13) into the gap (25) between the nozzle and the flapper, and a pressure-sensing line (24) from the nozzle chamber to a pressure-dependent member (7) to transmit a pneumatic pressure signal from the nozzle chamber to the pressure-dependent member.

REFERENCES:
patent: 3174499 (1905-03-01), Mott
patent: 3586287 (1971-06-01), Knobel
patent: 3645293 (1972-02-01), Pedersen
patent: 3982554 (1976-09-01), Saito

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