SU502131A1 - Device for regulating the pressure in the manifold of the compressor group - Google Patents

Description

pulse generator 8. connected to the control unit 9 actuators 10 kom.pressorov 11.

Consider the operation of the device in relation to iK piston compressors, the change in the performance of which is carried out stepwise with the help of actuators. The actuators are a container connected by a control signal by means of a valve to the working space of the compressor cylinder. The connection of the actuator means that the performance of the cylinder is disconnected - disconnection - (it promotes.

The device works as follows.

Example 1. Consider the case when the regulated pressure is greater than g of the Bleni assignment, i.e. At the same time, at the output of the element of comparison 5, the discrete signal "1. As the deviation of the regulated pressure from the reference increases, the analog signal at the output of the proportionality block 4, equal to k-AP k (Рр-РЭ), where k-, the amplification ratio of the prapo: relativity, also increases. This signal is fed to the input of the comparator unit 6 and to the input of the anticipated unit 5. An analogue signal from the output of the preliminary unit, ", c dk-P

rhenium 5, equal to, - served on

Comparison unit 6 and per control input GeP Qdk-P

pulse impulse o. Value -, j-when

this will be greater than zero.

dk DR

Therefore, k ARN- - k DD, and

at

"And the output of the block of comparison 6. On a discrete signal;" 1.

The discrete Oi6a signal "1 from the output of the comparator unit 6 and the comparator element 5, is sent to the logic element" equivalence 7, the output of which is the power input of the pulse generator 8. The frequency of the generator; the pulse corresponds to

A i p dk- Р

signal to AP-J -.--, 1 incoming on

the control input from the output of the pre-block unit 5. That is, the frequency of the control pulses depends on the sum of the error and its speed. The discrete signal "1 from the output of the comparison element 3 and the pulses from the output of the generator 8 are fed to the control unit 9 by the executive devices 10, which, according to a given algorithm, distributes the control pulses from the generator 8, to the connection of the executive devices 10 of the compressors and. Connecting actuators 10 leads to a decrease in pressure in the manifold of the commvarsarav group. One pulse corresponds to the impact on one actuator 10 of one of the compressor 11.-When reducing the deviation

dk. P value, - 0. Therefore,

dt

TH..DYA

and to the inputs of the logic element "equivalence 7 1 access and discrete signals" O from the output of the comparison block 6 and "1 from the output of the comparison element 3. At the same time, the output of the logic element" positive 7 will have a discrete signal "O, i.e. pulse generators 8 not will be powered.

dk P

Thus, when - and - ri 0

 the impact on the actuators 10 of the compressor 11 is missing.

Example 2. Consider the case when the regulated pressure is less than the target pressure, i.e. Pp Pc-At the same time, at the output of the element of comparison 3, the discrete signal “O. An increase in the deviation of the regulated pressure from the analog setting.

 l D «dk- Р r

the signal to the AP decreases, and - ttt- U.

(iji. dr

Therefore k AR Ng; - k DR, and

at

at the output of the element of block 6, the discrete signal “O.

Since the input signals of the logic element "equivalence 7 are equal to" O, then at its output by vit | s the discrete signal "1, and the pulse generator 8 will be powered. The discrete signal "O from the output of the comparison element 3 and the pulses from the generator 8 enter the control unit 9 by the executive devices 10, which distributes the control pulses to shut off the actuators 10 of the compressors / L. The actuation of the actuators 10 leads to an increase in pressure in the collector of the compressor group / /. When reducing from dfe-DR ,,

the clone value is U. Consequently,

dt

,, d dk-ap,,

K-ARC-P-C-DRI to the inputs of the logical element “E) qui-valentity 7 discrete signals“ 1 from the output of the comparison unit 6 and “O from the output of the comparison element 3. The pulse generator 8 will not be energized.

dk DR Thus, with and

Ctt

There is no effect on the actuators 10 of the compressors 11.

Claims (1)

Invention Formula A device for regulating the pressure in the manifold of a group of compressors, comprising a pressure sensor and a setter connected to a comparison element and a proportional unit connected to a preliminary unit associated with a pulse generator, so that improve control quality is connected to the output of the proportionality and the forelock unit of the | comparison unit, connected to the logic element "equivalence, the second input of which is connected to the comparison element, and the output is with a generator.