SU1569427A1 - Method of regulating capacity of multicylinder compressor plant and device for effecting same - Google Patents

Abstract

The invention relates to compressor engineering and relates to methods and devices for controlling the performance of multi-cylinder piston compressor units. The purpose of the invention is to increase the reliability of performance control. The mechanisms 1, 2 and 3 of the extraction of the suction valves 4, 5 and 6 are connected to the pressure sensors (A) 7, 8 and 9, and the chamber (K) 10 is divided by a piston (A) 11 into a hydraulic and gas cavity 15 and 16. The last connected to one of the cylinders (C) 12, 13 or 14, in this example with the cylinder 12. The pump 17 is connected to the hydraulic distributor (DG) 20, the latter - to K 10 via the throttle element 21, and D 7, 8, 9 and 18 - with time relay 19. The throttle element 21 stabilizes the operation of the HP 20 and the pump 17. Increasing the discharge pressure to the D 18 setpoint triggers it and triggers the HD 20 to the middle position. The position of the P 11 is stabilized, and the volume of the gas cavity 16 is fixed by a non-multiple capacity value C 12, 13 and 14. With a further increase in pressure, mechanism 3 is pressed for pressing valve 6 and the capacity decreases discretely by the magnitude of performance C 14. The unit operates in a cyclical mode. In each cycle, mechanism 3, via relay 19, outputs a pulse to state duty unit 20. The pulse duration is T = 0.5T ^. Q _n ΔP _d / Q _p ^. P _p , where T is the response time of the modulating mechanism in the specified range

Q _n - nominal gas consumption of consumers

ΔP _d - the width of the dead zone of the sensor. With a further increase in pressure, D 7 and 8 are similarly turned on, after which the capacity of the plant is reduced by the desired amount. The reverse adjustment of the modulating control mechanism is also carried out by applying control pressure pulses. 2 hp f-ly, 1 ill.

Description

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These C 12, 13 and 14. With a further increase in pressure, mechanism 3 is pressed for pressing valve 6 and the capacity is reduced discretely by the magnitude of output C 14. The unit operates in a cyclical mode. In each cycle, sensor 9 sends a pulse through the relay 19 to ify 20. The pulse duration is t 0.5 T xRn Rd / Op-Pjjs where T is the response time of the modulating mechanism in the specified range, Qn is the nominal gas consumption of consumers, YRA - width deadband sensor. With a further increase in pressure, D 7 and 8 are turned on in the same way, after which the capacity of the plant is reduced by the required amount. The reverse adjustment of the modulating control mechanism is also performed by applying control pressure pulses. 2 sec. f-ly, 1 pl.

The invention relates to a compressor system and relates to methods and devices for controlling the performance of multi-cylinder piston compressor units.

The purpose of the invention is to increase the reliability of performance control.

The drawing schematically shows a device for controlling the performance of a piston three-cylinder compressor unit that implements the method.

The device includes mechanisms T-3 for extracting suction valves 4-6, pressure sensors 7-9 connected to them, at least one chamber 10 divided by a piston 11 into a hydraulic one and connected to one of cylinders 12-14, for example cylinder 12, a gas cavity 15 and 16, an oil pump 17, a piston control mechanism 11, an additional injection pressure sensor 18 and a time relay 19 connected to sensors 7, 8, 9 and 18.

The control mechanism is in the form of a hydraulic distributor 20, connected to an oil pump 17, a time relay 19, an additional sensor 18, and through a throttle element 21 — to the hydraulic cavity 15 of the chamber 10. Sensors 7s 8, 9 and 18 are gas-connected to 22 pumping.

The performance control device operates as follows.

An increase in the pressure of the pressure setpoint of the sensor 18 causes it to disconnect and switch the control valve 20 to the middle position. When this happens, the oil supply by the pump 17 to the hydraulic cavity 15 of the chamber 10 stops. The position of the piston 11 is stabilized, and the volume of the gas cavity 16 is fixed by the corresponding capacity value, not a multiple of the capacity value of the cylinders 12-14. The smooth control range using camera 10 is greater than the capacity range of any of the cylinders 12-1.

With continued pressure increase (in the event of a reduction in gas consumption), an injection pressure sensor 9 is triggered, the setpoint of which is minimal compared to sensors 7 and 8 connected to the discharge line 22. In this case, the mechanism 3 for extracting the suction valve 6 is turned on, the capacity of the installation decreases discretely by the magnitude of the capacity of the cylinder 14. If the discharge pressure drops below the nominal, the sensor 3 activates valve 6 and the installation operates in a cyclical mode. In this case, in each cycle, the sensor 3 issues a control pulse to time relay 19, and the latter to the control valve 20. The pulse duration is determined by the ratio

de T is the response time of the stepless adjustment mechanism in the specified rangej control zone; consumer gas consumption

YR - the width of the dead zone of the sensor,

PH is the nominal discharge pressure.

Qp QH

With a further increase in pressure, sensors 7 and 8 turn on in the same way, actuating mechanisms 1 and 2 for pressing out suction valves 4 and 5, after which the capacity of the installation decreases by the required amount. The reverse adjustment of the modulating control mechanism is also carried out by applying control pressure pulses. The throttle element 21 stabilizes the operation of the hydraulic distributor 20 with the pump 17.

The application of the proposed method and device contributes to improving the reliability of performance control.

Claims (2)

1. A method of controlling the performance of a piston multi-cylinder compressor unit containing step and smooth control mechanisms by supplying control pulses to them using pressure sensors, characterized in that, in order to increase reliability when used in pneumatic installations of mines, the control range the smooth control mechanism selects no less than the control range of the step control mechanism, and the control pulses applied to the mechanisms are selected They are used to periodically turn on the smooth control mechanism in the direction of decreasing productivity, and The capacity t of each of its $ included is determined by the formula: t 0,5 T Ph DR DR VPH Jq five 0 0, 0 five QpQHrn UP where T is the response time of the modulating mechanism in the n range, regulation zone; nominal gas consumption by the consumer - initial pressure - injection, the width of the insensitivity zone - to carry the sensor, and the reverse adjustment of the modulating control mechanism is also performed by applying control pressure pulses. 2. A device for regulating the pro- duction of a piston multi-cycle compressor installation containing mechanisms for pressing suction valves, pressure sensors connected to them, at least one chamber divided by a piston into a hydraulic one and connected to one of the gas cylinders, oil pump, a piston control mechanism, an additional pump pressure sensor and a time relay connected to the sensors, characterized in that the piston control mechanism is designed as a hydraulic distributor, union of a oil pump, timer, and further through the throttle sensor element - hydraulic chamber cavity.