SU562828A1 - Pneumatic computing device - Google Patents

Description

The invention relates to the field of analog automation, predominantly neutralization process control systems, built on the basis of systems of elements of industrial pneumatic automation.

A device with an adjustable sensitivity zone is known, which contains a position regulator, an unloaded valve and one relay 1. A disadvantage of the device is the complexity of instrumental implementation of the deadband, as well as limited functionality that allows for generating at the discrete level only a discrete level.

It is also known a device for limiting pneumatic signals, comprising four reference elements, two control devices and a silica gel 2.

A disadvantage of this device is also the complexity of the hardware implementation of the level of the limitation and the limited functionality in converting the input n-nemosignals.

The closest technical solution to this device is a pneumatic computing device containing a nerve master connected to the seat of a three-membrane element compared to a repeater circuit, whose input is connected to the input of the device, and the output is from the positive chamber of the main five-membrane element comparison, included in the repetition scheme, the negative camera of which is connected to the second setter 3. The use in this converter is rather complicated, in terms of efficiency ii, converting a system parameter narrows the scope thereof.

The purpose of the invention is to expand the scope.

This is due to the fact that in the device there are installed the first ptmembrane element with a matching circuit, included according to the repetition scheme, and the second and timembrand element of comparison with the amplifier and the third setter, included according to the summation scheme with multiplication by a constant factor, and the input channel of the device .Unin from the positive chamber of the first complementary 5thmembrane comparison element, the negative chamber of which is connected to the output of the main nibble element of the comparison, and its output is connected to ozhitelnoy dopoltggeliogo second chamber and timembrannogo elemepta compared, via an amplifier whose output is coupled to the output of the apparatus.

metric inherent in fast-seeding processes of neutralization, into the dead zone with simultaneous paralel displacement of the sloping branches and after duid masses stabilization of the curve to the normalized range of 1 serpentine. The pneumatic calculating device implements the following

(() 11KPPI.

out (trans.

Where

I Jaz, P,

at

„,

: er. Yay - (Yav - RP

Yah I R"

in

I"

I

(Pi - ZR ,,)

- the magnitude of the shift: σ, specified by, and in the second additional, five-tone-element comparison element;

- coefficient of damping;

ro .--

everywhere

pressure signal soJ IlblX) -GVH responsibly exiting and entering the device; PH, PB - the value of pressure corresponding to the lower and upper sections of the maximum steepness;

P °, I ° - the value of pressure, corresponding to the lower and upper ends of the branches of the transformed potentiometric curve.

The scheme of the proposed device is shown in the drawing.

The device contains a three-membrane element 1 of comparison, the first unit 2, the main five-membrane element 3 of the second unit 4, the additional first 5 and second G-type membrane elements, the third unit 7, the throttle adder 8 and the power amplifier 9.

The first setting device 2 is connected to the satellite of the three-membrane comparison element 1, which is connected according to the repetition scheme, the input of which is connected to the input of the device, and the output is connected to the positive chamber of the main five-membrane connection element 3 that is connected according to the repetition scheme, and its negative camera is connected to the second setting device 4. The output of element 3 and the entrance to the device are connected, respectively, with the negative and positive chambers of the additional first

pmembrane element srappenp. switched on according to the new combustion scheme, and the output of which is connected to the positive chamber of the second five -membrane element (compared); G, with a power amplifier 9, a throttle adder 8, and a third presetter, 7, inclusive according to a summation scheme with multiplication and a constant i) i and coefficient.

The device is operating in a slime;

At the output of the three-membrane comparison element I, included in the repetition scheme, the input signal is reproduced until it reaches the limit value set on the first unit 2, connected with the nozzle of the comparison element. On

the output of the file is a type of membrane e.themeite

3 sravnenn, vk1K)) scheme poorenIN, is formed enrna; i, correspondingly}

The difference between the signal and the value of the signal is set by the 1st second setpoint 4. From the element 3, the signal enters the negative chamber and the input signal goes to the positive chamber of the first nt.mbrane element 5 compared to the one added according to the summation scheme. With

This, and the output of the element is a formal signal, which signals the lower wind of the transformed curve and remains: -dimensional and equal to the lower 3 of the normal part of the macrolential slope until it is lying down. At the entrance to the device, it remains within the indicated area, and when it goes beyond its upper boundary it reproduces the value of the difference in the values of the values of the upper and lower spgnas of the upper and lower levels.

outgoing curve. Next, the signal enters the positive chamber of the second n. M.membraction element 6 of the comparison, which is switched on according to the summation scheme with a multiplication pa constant coefficient, at the output of which the power amplifier 9 is installed, which provide for mashigging. and p; a different curve to the untied. range of changes in pneumatics.

Thus, the proposed pneumatic computing device de-energizes the parallel mixing of the branches of a poteii and metric curve up to the full;

insensitivity and further scaling of the transformed curve to a unified range of modified energies.

The pneumatic computing device used in the automatic control system of the neutralization device will not increase and suppress the self-oscillation, due to the fact that the ratio li min of the coefficients} of the strength of the thermal measurement measured by the electrometer in the sensor, the quality of the control of the neutron regulation the process, caused the use of a pneumatic computation of a taller device in 5LI15, it will allow to reduce losses from; 5

min 30-45 thousand rubles.

unit amselpttra capacity of 450 thousand tons.

Claims (3)

1.Sb. “Automation of chemical plants, vol. 4, M., p. 78-92, 1967. 2.G. “Instruments and control systems L3, p. 45, 1973. 3. “Instructions on the software setting unit for the RF6.2 type parameter of the Saransk instrument-making plant. Pf, iiif.