SU928312A1 - Device for regulating pressure in gas dynamic plant chamber - Google Patents

Description

The invention relates to the automatic control of continuous and cyclic processes and can be used to control objects equipped with several regulators, at least one of which is equipped with different speed drives, for example, to control the pressure in experimental gas-dynamic installations. Devices for pressure control in gas-dynamic installations with one actuator are known, comprising a pressure sensor, a setpoint adjuster, a regulator, and a unit for calculating the position of the actuator 1. A disadvantage of this device is the long-term output of the set to modes. Closest to the invention in its technical essence and the achieved result is a pressure control device for a multi-actuator unit / at least one of which is equipped with a combination of different speed drives containing a physical one; installation model, software control unit, the third output of which is connected to the pneumatic actuator of the first optional unit, a relay connected to the second output of the programmable control unit, the first regulator, the output of which is connected to the electric actuator of the first actuator and the first input of the programmable control unit, differential pressure sensor connected to the input of the first regulator through the closing relay contacts, sensor position of the first actuator, correction unit, the first input of which is connected to the position sensor, and the output is connected to the input of the first controller through the opening relay contacts, the pressure sensor in the model, the second controller, the first input of which is connected to the first output of the program control unit, to the pressure sensor output in the model, and the output - with the input of the software control unit and the actuator of the second actuator and the position sensor of the second actuator, the output of which is connected to the second input of the correction unit 2. The disadvantages of such a device are significant costs ology sequential withdrawal gazodinamicheskoj installation on predetermined modes, since. In this device, the pneumatic actuator is used only when outputting the device to the first of the specified modes, which leads to an increase in the duration of the experiment, and, consequently, to an increase in energy consumption. . The purpose of the invention is to reduce (Energy Costs. The goal is achieved by introducing a computing unit, a unit for calculating the position of the first actuator, as well as a pressure sensor in the high-pressure line, a chamber Nozzle area sensor, into the pressure control device in the gas-dynamic installation chamber a temperature sensor in the high pressure line and a temperature sensor in the chamber, the outputs of which are connected to the corresponding first inputs of the unit for calculating the position of the first actuator, the output of which through The open contact of the relay element is connected to the first input of the first controller, the second input is connected to the quarter output of the control unit, and the third input to the output of the second position sensor through the first closing contact of the relay element to the first input of the computing unit and through the second closing contact of the relay element - with the second input of the second controller; the second input of the first controller is connected with the output of the first position sensor, with the second input of the computing unit directly and with the third input the computational block through the third closing contact of the relay element, the output of the pressure sensor is connected to the second input of the program control unit and through the third disconnecting contact of the relay element to the first input of the second regulator, the first input of which is connected via the fourth closing contact with the output go block. FIG. 1 is a structural diagram of the device; in fig. 2 is a diagram of the block for calculating the position of the first optional unit, option; in fig. 3 - execution of the scheme of the calculator of the unit, option; in fig. 4 - automatic execution of the program control unit, option. The device comprises a high pressure line .1, a chamber 2 of the installation with a nozzle .3, actuators 4 and 5 with electric drives 6 and 7, respectively, and a pneumatic actuator 8 of the first actuator 4, program control unit 9, first 10 and second 11 regulators, relay element 12 with three disconnecting contacts 13-15 and four closing - 16-19, block 20 for calculating the position of the first actuator, computing unit 21, sensors 22 and 23 for positioning the first and second actuators, pressure sensor 24 in the installation chamber, sensor 25 d High-pressure lines, a chamber nozzle area sensor 26, a high-pressure temperature sensor 27, and a chamber temperature sensor 28. The block 20 for calculating the position of the first actuator contains, the computing unit 29, the first 30 and second 31 functional converters, the inverter 32; and an adder 33, and the computing unit 29 consists of two dividing units 34 and 35, a square root extracting unit 36 and two multiplication units 37 and 38. The computing unit 21 comprises an amplifier 39, a relay element 40 with two decelerating contacts 41 and 42, two memory elements 43 and 44, four functional converters 45-48, an inverter 49 and an adder 50. The software control unit 9 contains a step finder (ring counter) 51 controlled by a clock signal generator 52, two zero-organs 53 and 54, a relay element 55 with two locking to ntaktami 56 and 57, delay unit 58, comparing unit 59, a trigger 60 with a complementing input, flip-flop 61 and the terminal 62. The apparatus operates as follows. Prior to the initial implementation of the first mode, the program control unit 9 transmits a signal corresponding to the specified value of the voltage in the first mode to the second input of the position calculation unit 20 of the first actuator. Its first inputs receive signals from sensors 25–28 about the pressure in the high pressure line (Pg). nozzle area (E), the temperature in the line (TD) and the chamber (T). The third input receives a signal (1 (1) from the sensor 23 of the position of the second actuator. Computing unit 29 continuously calculates the opening area (F) corresponding to the established first mode, implement the formula where P is the set pressure in chamber 2 in the first mode. Signal the sensor 23 is fed to the first 30 functional converter, the output of which thus receives the signal F ,, corresponding to the current opening area of the second actuator. By means of the adder 33 and the inverter 32, the difference FF - F is calculated, n The opening of the first 4 actuators in the first steady state, which through the second to 31 functional converters is converted into the position signal of the first executive. This signal through the disconnecting contact 14 is sent as a signal to the first input of the first 10 controller, which arising mismatch, sets the movable stops of the first 4 executive body to the calculated position by means of electric drive b (pneumatic actuator 8 is turned off) The first 10 regulator, which is fed to the first input of the software control unit 9, is close to zero, and the block 9 generates at its second output, a signal corresponding to a predetermined pressure in the first mode, which through the opening contact 13 enters the first input of the second 11 controller and, at its second output, the software control unit 9 generates a turn-on signal of the pneumatic actuator 8 of the first 4 actuator. From this moment begins the implementation of the next mode of operation of the plant. There is a rapid opening of the first 4 executive body to the value calculated by block 20 until the pneumatic actuator piston is pressed against the stop. At the same time, the second regulator begins to work out the mismatch, acting on the electroshaft 7 of the next 5 executive body, using the signal from the pressure sensor 24 in the chamber as a feedback signal. When the installation of the specified setpoint mode (pressure in chamber 2 is stabilized near the setpoint), the software control unit 9 turns on the relay element 12. The contact 14 is open, the first input of the first 10 controller is given a zero signal and the controller 10, working out the resulting error closes the first additional unit, affecting its electric power, water 6. At the same time, via contacts 13 and 19, the first input of the second .11 controller is disconnected from the program control unit .9 and connected to the output in numeral block 21 and through the contacts 15 and 17 the second input of the regulator 11 is disconnected from the sensor 24, the pressure in the chamber and connected to a position sensor 23 of the second actuator body. Through contacts 16 and 18, the computing unit 21 fixes the position of both actuators at the moment the relay 12 triggers and calculates the total area of their opening. After receiving information about the position changes of the first 4 actuators, the computing unit 21 continuously determines the required position of the second 5 actuators where the total area of the opening of the two organs is constant and equal to the fixed value. After the relay 12 has triggered, the computing unit acts as a setpoint for the second 11 controller. Thus, the first 4 executive body is closed, and the second - 5 is opened, and the total area of their opening remains constant. When the first 4 actuator is completely closed, the signal from the output of the first 10 regulator is again close to zero and the software control unit 9 turns off the relay 12. The second controller 11 is again connected to the control unit nporpciMMHoro 9 and the pressure sensor 24 in the chamber. Simultaneously, the program control block. Lenin turns off the pneumatic actuator 8. Before starting the next mode, the program control unit 9 issues the next task for pressure and block 20 to the calculation unit 20 of the first executive body, calculating the new position of the stop of the first 4 executive bodies, extracts it to the first input of the first 10 controller, which by means of electric drive b will bring the emphasis to a new position. After this, block 9 generates a signal for activating the pneumatic actuator B, issues a pressure command to the second controller 11, and begins the implementation of the next mode of operation of the plant. Computing unit 21 remembers the position of both executive bodies at the time of the installation of the mode. In this case, the first and third inputs of the block 21 receive signals from the sensors 23 and 22, the position of the second and first executive bodies, respectively. These signals, through closed contacts 41 and 42, arrive at elements 43 and 44, where they are memorized. At the same time, the signal from the first input of block 21 through the amplifier 39 enters the rel 40, which, after a deceleration time, opens contacts 41 and 42. Thus, the memory elements 43 and 44 memorize the positions of both actuators and maintain the corresponding constant signals at the inputs of the first two functional transducers 45 and-46, the outputs of which receive constant signals corresponding to the areas of the opening of both organs. These signals are sent to the first two inputs of the adder 50, to the third input of which is fed, constantly changing ;; a signal corresponding to the current open area of the first organ, but with the opposite sign, which is achieved by successive

switching on the third 47 functional converter, identical to the first 45, and inverter 49. Thus, at the output of the adder 50, we receive a signal corresponding to the required opening area of the second 5 executive body, at which the total opening of both bodies is equal to the fixed one. By means of the fourth 48 functional converter, having realized the inverse transformation, at the output of block 21 we obtain the signal of the desired position of the second actuator.

The software control unit 9 operates as follows.

The period of operation of the generator 52 is equal to the time allotted for each mode of installation. When the generator 52 generates a regular pulse, the searcher 51 shifts by one position and sets the next task signal at its output. This signal goes to the fourth output of block 9 and through the block of delay 58 to the closing contact 56 and the first input of the comparison element 59. After the stops of the first 4 actuator are installed, the signal at the first input of the block 9 is close to zero, the first 53 zero is triggered. an organ that turns on the relay element 55. Through the contact 56, the reference signal goes to the second output of the block 9. The contact 57 connects the terminal 62 to the trigger 60, which is transferred to the i position and generates a pneumatic actuator start signal at the third output of the block 9 as well as usO

tantalizes

Trigger 1, as soon as the installation enters the current mode, the error signal at the output of the comparison element 59 approaches zero and the second 54 null body is triggered, which flips to position 1 trigger 61, which in turn produces a turn-on signal for relay 12 at the first output of the block 9. The signal at the first input of block 9 is different from zero and the zero-body 53 turns off the relay 55 When the first 4 actuator closes, the signal at the first input of block 9 will again become zero and the null organ 53 again turns on the relay 55 at the second output of block 9 the reference signal is turned off, the trigger 60 with a counting input receives another pulse, and it is set to O, that is. On the first output of block 9, a relay 12 trip signal appears. When the next installation mode is working, the operation of the software control unit is repeated is. Delay block 58 is set so that when block 9 is turned on, the reference signal

at the same time, not on vils on its second and fourth outputs (delay value 0.05-0.1 s).

Thus, in the device for regulating the pressure in the chamber of the gas-dynamic installation, pre-installation of the stops of one of the executive bodies with subsequent quick opening by means of a pneumatic actuator is used when putting the installation to each mode. This leads to a decrease in the output time for each mode, and, consequently, to a decrease in the energy consumption for conducting experiments at the facility.

The essence of the proposed device does not change if the installation has not two executive bodies, but several, combined into two groups. In addition, the optional

the presence of electric and pneumatic actuators. It is enough to have two types of different speed drives or two executive bodies connected in series with

multi-speed drives.

Claims (2)

Invention Formula A device for regulating the pressure in the chamber of a gas-dynamic installation, containing sequentially connected software control unit and a relay element, as well as a pressure sensor in the chamber, actuators electric actuators, inputs connected to the outputs of the corresponding regulators, and outputs to the inputs of the corresponding position sensors, and the output of the first the regulator is connected to the first input of the program control unit, the second output of which is connected with the first through the first disconnecting contact of the relay element m input of the second controller, and the third output - with the input of the pneumatic actuator of the first actuator, characterized in that, in order to reduce energy consumption, it contains a computing unit, a unit for calculating the position of the first actuator, as well as a pressure sensor in the high pressure line, an area sensor chamber nozzles, a temperature sensor in the high pressure line and a temperature sensor in the chamber, the outputs of which are connected to the first inputs of the first actuator calculation unit, the output to torogo through second opening the contact of the relay element is connected to the first input of the first controller, the second input is connected to the fourth output of the program control unit, and the third input is connected to the output of the second position sensor, through the first closing contact of the relay element to the first input of the computing unit and through the second closing contact of the relay element - with the second input of the second controller, the second. the input of the first regulator is connected with the output 5 of the first position sensor, with the second input of the computing unit directly and with the third input of the computing unit through the third closing contact of the relay element, 10 the output of the pressure sensor is connected to the second input of the program control unit and through the third disconnecting contact of the relay element to the first input of the Second Controller, the first input of which through the fourth closing contact is connected with the output of the computing unit. Sources of information taken into account in the examination t 1. USSR author's certificate I 102913, cl. G 05 B 11/00, 1970. 2. USSR author's certificate 327453, cl. G 05 D 16/20, G 05 B 11/32, 1972 (prototype). R L 7L I 1 one