RU2322638C1 - Device for supplying gas - Google Patents

Abstract

FIELD: gas engineering.

SUBSTANCE: device comprises gas pipelines, pressure regulators, gas valve, manometers, metallic hoses, measuring chamber with two pressure gages, solenoid valve, two analogue-digital systems, two storage devices, two digital comparators, device for digital indication, device for control of pressure, and starting device.

EFFECT: enhanced accuracy and expanded functional capabilities.

1 dwg

Description

The invention relates to gas technology and is intended for the automatic delivery of gas to a consumer at predetermined pressure values and can be used to fill aircraft with compressed gases, including at compressor stations and gas stations.

A device for automatically filling a cylinder with gas [USSR Author's Certificate No. 588367, IPC F17C 5/06, 1976], comprising an inlet throttle cylinder, a source of stabilized high gas pressure, a supply line, a shut-off valve, a measuring chamber with a pressure gauge, a throttle mounted on the line in front of the measuring chamber, time is a counting unit, the input of which is connected to the output of the pressure gauge, and a counting and deciding unit, the first input of which is connected to the time output - of the counting unit, and the output - with a shutoff spredelitelem.

A device for automatically filling a cylinder with gas is known [USSR Author's Certificate No. 907335, IPC F17C 5/06, 1979], which differs from the device [USSR Author's Certificate No. 585367, IPC F17C 5/06, 1976] in that it is equipped with a temperature sensor installed on the body of the cylinder and connected to the computing unit.

The disadvantage of these devices is the use as the main element of pressure measurement of a mechanical gauge with electrical contacts, the absolute measurement error of which is determined only in the middle third of the scale.

The use of a stabilized source of high gas pressure in these devices makes it impossible to use these devices in mobile gas tankers.

Known devices for the delivery of gases to consumers at compressor stations, for example: UKS-400 VP-4 [TU 26-12-354-90], UKS-400 V 131 [TU 26-12-776-88], a unified gas-charging station UGZS. M (UGZS-350) [TU 24-0509-004].

These devices are gas lines connecting the cylinders with a pressure regulator, with a gas discharge valve, with pressure gauges for monitoring pressure. Each such line ends with a metal hose and is necessarily equipped with a safety valve. Before charging the consumer with gas, a manual adjustment of the pressure regulator is carried out, and gas is dispensed manually with constant monitoring of the pressure increase according to the pressure gauge.

The main disadvantage of compressor stations UKS-400 VP-4 and UKS-400 V 131 is that gas is produced only at three fixed pressures: 150 kgf / cm ² , 230 kgf / cm ² and 400 kgf / cm ² . The unified gas-charging station UGZS.M has five separate channels for regulating pressure in the manual mode, including four fixed ones: 30 kgf / cm ² , 150 kgf / cm ² , 230 kgf / cm ² , 350 kgf / cm ² , which complicates precise adjustment gas pressure in the full range from 0 to 350 kgf / cm ² .

Moreover, the absolute error of measuring the gas pressure in these products depends on the measuring scale of pressure gauges, the accuracy class of which is not less than 1.5 and is determined in the middle third of the scale.

The technical task of the invention is the automatic delivery of gas to the consumer in the entire range of preset pressures without manual adjustment and protection of the consumer from exceeding the specified gas pressure.

This object is achieved in that the gas supply device for a given pressure, containing compressed gas cylinders, gas lines, pressure regulators, gas valves, pressure gauges and a metal hose, contains a measuring chamber with two pressure sensors, an electromagnetic valve, two analog-to-digital systems, two read-only memory devices, two digital comparators, a digital display device, a pressure setting device and a start device, the first pressure sensor through the first analog-to-digital system it is connected to the first read-only memory device, the data bus of which is connected to the digital display device and to the first input of the first digital comparator, and the second pressure sensor through the second analog-to-digital system is connected to the second read-only memory device, the data bus of which is connected to the first input of the second digital comparator ; the output of the pressure setting device is connected to the second input of the first digital comparator and to the second input of the second digital comparator, the outputs of which are connected to the input of the launcher; the output of the launcher is connected to the input of the solenoid valve control device.

The drawing shows a diagram of a device for the delivery of gas at a given pressure.

The device contains cylinders with working gas 1, consumer capacity 2, gas line 3, measuring chamber 4 with pressure sensors 5 and 6, analog-digital systems 7 and 8, read-only memory devices 9 and 10, digital comparators 11 and 12, digital indication device 13, a pressure setting device 14, a triggering device 15, a solenoid valve control device 16, a solenoid valve 17.

The device operates as follows:

When you set the specified pressure from the device 14 to the digital comparators 11 and 12, a digital signal is supplied in binary decimal code (conditionally code "C"). When the operator presses the "START" button, the start-up device 15 generates a logical unit signal, which is fed to the solenoid valve control device 16. The solenoid valve control device 16 generates a pulse that is fed to the opening winding of the solenoid valve 17. The valve opens the gas line 3. The working gas from cylinders 1 begins to fill the capacity of the consumer 2 and the measuring chamber 4.

Pressure sensors 5 and 6 convert the excess gas pressure in the measuring chamber into unified current signals that are fed to analog-digital systems 7 and 8. Analog-digital systems 7 and 8 convert the current signals to binary digital codes that are sent to read-only memory 9 and 10.

In the read-only memory 9, the binary code is converted to binary decimal (conditionally code “A”), which is transmitted simultaneously to the digital comparator 11 and digital display device 13. The digital display device 13 converts the binary decimal code (conditionally code “A”) in a seven-segment code that displays the value of the effective gas pressure in the measuring chamber 4.

The digital comparator 11 compares the binary decimal code (conditionally code “A”) with the binary decimal code generated in the pressure setting device 14 (conditionally code “C”),

When the condition is met:

∑ _A > ∑ _C ,

where ∑ _A is the sum of the numbers of code "A",

∑ _C - the sum of the numbers of the code "C",

the digital comparator 11 generates a logic zero signal, which is fed to the first input of the launcher 15.

From the triggering device 15, a logical zero signal is supplied to the control device of the electromagnetic valve 16. The control device of the electromagnetic valve 16 generates a pulse that enters the closing winding of the electromagnetic valve 17. The valve closes the gas line 3.

After closing the gas line 3, the gas pressure in the consumer’s tank 2 and in the measuring chamber 4 may become less than the set value, which is due to the pneumatic resistance of the gas line. In this case, the digital comparator 11 generates a logic unit signal, which is fed to the first input of the trigger device 15. In the trigger device 15, the logic unit signal is temporarily delayed, which is necessary to equalize the pressures in the consumer's container 2 and in the measuring chamber 4. The trigger device 15 generates the signal of the logical unit, which is supplied to the control device of the electromagnetic valve 16. The control device of the electromagnetic valve 16 generates a pulse that is supplied to the opening winding solenoid valve 17. The valve opens the gas line 3.

The process of gas delivery to the consumer at a given pressure will end when the following conditions are met:

Reese - Rep = ΔP,

where Reese is the gas pressure in the measuring chamber 4,

Rep - gas pressure in the consumer's tank 2,

ΔР - interval of discreteness of values of a given gas pressure.

The consumer protection system from exceeding a predetermined gas pressure of the proposed device, comprising a pressure sensor 6, an analog-to-digital system 8, read-only memory 10 and a digital comparator 12, according to the connection scheme of the elements included in it, proposed in the invention, duplicates the main device circuit consisting of a sensor pressure 5, analog-to-digital system 7, read-only memory 9 and digital comparator 11 and is triggered in case of failure of elements of the main circuit of the device.

In the read-only memory 10, the binary code is converted into a binary decimal code (conditionally code "B"), which is transmitted to the digital comparator 12.

The digital comparator 12 compares the binary decimal code (conditionally code "B") with the binary decimal code generated in the pressure setting device 14 (conditionally code "C").

To operate the consumer protection system from exceeding a predetermined gas pressure, the following programming condition for read-only memory devices 9 and 10 must be fulfilled:

∑ _B -∑ _A = n1 ₂ ,

where ∑ _B is the sum of the numbers of the code "B",

∑ _A - the sum of the numbers of the code "A",

n1 ₂ is a number in binary decimal code, n> 0.

When the condition is met:

∑ _B > ∑ _C ,

where ∑ _B is the sum of the numbers of the code "B",

∑ _C - the sum of the numbers of the code "C",

the digital comparator 12 generates a logic zero signal, which is fed to the second input of the launcher 15.

From the trigger device 15, the logical zero signal is supplied to the control device of the electromagnetic valve 16, where a pulse is formed to close the valve 17.

The discreteness of the values of the set gas pressure in the proposed device is determined by the number of bits of the data bus of analog-digital systems 7 and 8, for example, the use of eight-bit analog-digital systems in the gas pressure range from 0 to 40 MPa allows you to set the target pressure with a resolution of 0.2 MPa, and the use of ten-digit analog-digital systems - with a resolution of 0.05 MPa.

Thus, the proposed device provides automatic gas delivery to the consumer in the entire range of preset pressures without manual adjustment.

The use in the proposed device of a backup system for converting gas pressure into a digital code containing a pressure sensor 6, analog-digital system 8, read-only memory 10 and a digital comparator 12, protects the consumer from exceeding a given gas pressure.

Claims (1)

A device for delivering gas at a given pressure, containing compressed gas cylinders, gas lines, pressure regulators, gas valves, pressure gauges and a metal hose, characterized in that it contains a measuring chamber with two pressure sensors, an electromagnetic valve, two analog-digital systems, two permanent memory devices, two digital comparators, a digital display device, a pressure setting device and a triggering device, the first pressure sensor being connected through the first analog-to-digital system to the first a fixed storage device, the data bus of which is connected to the digital display device and to the first input of the first digital comparator, and the second pressure sensor is connected through the second analog-to-digital system to the second permanent storage device, the data bus of which is connected to the first input of the second digital comparator; the output of the pressure setting device is connected to the second input of the first digital comparator and to the second input of the second digital comparator, the outputs of which are connected to the input of the launcher; the output of the launcher is connected to the input of the solenoid valve control device.