SU525926A1 - Pneumatic controller with return area - Google Patents

Description

one

The invention relates to instrumentation, in particular to pneumatic controllers of technological processes.

A pneumatic controller with a adjustable return zone is known, containing a five-membrane comparison element, two pneumatic relays and a setting device, the direct input of the comparison element connected to the parameter channel, and the inverse input with the reference channel, the output of the comparison element connected to pneumatic relay control chambers, the output of the set point through the relay is connected to the cameras of the reference element l. However, this regulator has (Complicated design and is characterized by the impossibility of setting small values of Return Zones.

It is also known to have a pneumatic device with a custom deadband, containing a five-membrane comparison element, a setting unit, a throttle and a single-membrane repeater, the output of the setting device connected to the direct input of the comparison element, and the other direct input connected to the Channel of the Parameter; one

A repeater is connected directly: but with the inverse inputs of the CIXHMIO element; neither and via the choke - with the input signal: signal 2 - Comparison element in this (the device has a complex structure. 1. The pneumatic regulator is known with: Now, one camera is connected to the adjustable channel, and you are one to the output channel of the controller, two single-selected repeaters with Shift, deaf: whose cameras are connected, 1 to the ..va channel, inn, and the flow chamber nejiBoro is new; bodies with throttle shift oodimon | with a feed channel, and a valve whose control chamber is connected to the output of the comparison element 3. Such a regulator is also complicated in construction. In the proposed control {flow chamber of the first repeater with shifts m; is connected to another elomoite chamber CI: “IB can not, and through the valve - with the flow chamber of the second repeater with a shift,

This simplifies the design of the controller. In the drawing is a plan of Pr1Sh1Shpialna scheme iijjefljiojKeHnoro reg street tor. The regulator contains element 1, single-membrane repeaters with shift 2 and 3, other, x: sel 4 n valve 5. One element, the comparison is connected to an adjustable signal channel, blind cameras of repeaters 2 and 3 are connected to the reference signal channel f repeater flow chamber 2 through droplets; 4 podklyucheneG; to the feed channel {w and connected directly to another cell of the comparison element 1, and through clalan 5 to the flow chamber of another repeater 3. The output of the sneNfOHTa comparison is connected to the control chamber of valve S and to the upstream channel of the Pgyx regulator. The regulator works as follows: When the regulated P value at the controller input is less than the set value of P2 + & {, i.e. f P. (repeat TGfih 2 performs a positive shift of the signal P), the output of the element of comparison 1 forks the signal O and the valve 5 is closed. When the signal Fj reaches the value of i 2 D1. In the code of the element of comparison 1, signal 1 appears, which opens valve 5, and repeaters 2 and 3 are connected according to the minimum signal selection scheme. In this case, the shift of the signal P ,, is carried out by the repeater 3, on which the negative shift -A2 is tuned. Output from the PBA controller (This preserves its previous value of 1, since in this case 1 P - A, V). When r. The comparison element 1 is switched. and an O signal appears at its output. Thus, the regulator output, equal to I, changes to O with decreasing RP

one

u /////// /.

e 1

i

ptjp

Claims (3)

 I for the lower value of the return zone. The output of the controller is again equal to I at Pf PZ + AI, i.e. With an increase in the signal P, the upper value of the return zone. Thus, by changing the magnitude of the shifts D i and A g, you can set & any value of the return zone. In the manufacture of the specified regulator due to the simplification of its design, the economic costs are reduced by 4%. Claims. A pneumatic regulator with a return zone containing a reference element, one chamber of which is connected to an adjustable value channel, and an output to an output channel of the regulator, two single-membrane repeater with a shift, the blind chambers of which are connected to the reference channel, and the flow chamber of the first repeater with a shift through the throttle is connected to the supply channel, and the valve, the control chamber of which is connected to the outlet of the reference element, characterized in that, in order to simplify the regulator, in it the flow chamber of the first repeater with a shift connection, connected to another camera of the reference element; and through the valve-with the flow chamber of the second repeater with a shift. Sources of information taken into account during the examination: 1. Catalog of pneumatic instruments of the Start system, zd Tizpribor system. 2. Avt. St. USSR number 264021, M .. Cl. G-О5 В 11/44, from 17.О1.69.jj 3. Avt. St. USSR № 411433, M. Kl. G-O5 B 11/44, dated 04.21.72 (prototype).