DEVICE FOR PRESSURE CONTROL Russian patent published in 1997 - IPC

FIELD: automatic control for industrial devices which supply liquid from chamber at constant pressure. SUBSTANCE: feedback detector 13, which controls pressure, is located at input of liquid user. Tank 8 is connected to users through turbine usage transducer 14 and valves 12-1, ..., 12- α. turbine usage transducer 14 and frequency-to-code converter 24 measure fuel usage per second. This value is used by calculation unit 25 which controls characteristics of usage control unit 2 in order to set gas usage constituent G1g

which is supplied to tank 8 from cylinder 1 in order to fill free volume; second constituent G11g, is used for compensation of mismatch signals. It is calculated according to equation of constant pressure regulation dependency, which integration constant τ_i and derivation constant τ_∂ as well as pressure transmission rate K_p are corrected while tank 8 is being drained and volume of gas in is increased. This is achieved by means of level detector 10 which is connected to calculation unit 25 through converter 29 which converts digital signals to code. Information which is measured by pressure detectors 11, 14, 7 and detector 5 which measures constrictor angle α, is entered to calculation unit 25 through voltage converters 30, ... 32, commutator 33 and analog-to-code converter 34. Gas temperature which is taken into account during calculation of G1g, is measured by detector 9 and is entered to calculation unit 25 through unit 28. calculation unit 25 sets control unit 2 according to sum of gas usage constituents G¹ and G¹¹ using its usage characteristic α= f(G_g).. control commands are sent to control unit 2 through gates 27 of generator 26. Units 15 and 22 are designed for control of valves 12-1, ..., 12-α. EFFECT: increased functional capabilities. 2 cl, 6 dwg, 1 tbl