SU1688018A1 - Device for determining amount of compressed air delivered to user - Google Patents

Description

(21) 4659368/26

(22) 02/10/89

(46) 10/30/91. Bul №40

(75) A.M. Frolov and V.P. Smirnov

(53) 66.012-5 (088.8)

(56) USSR author's certificate

G 1247621, cl F 17 C 5/06, 1986.

Gaynullin F.G. and others. Natural gas as a motor fuel for transport. M .: Nedra. 1986. p. 105

(54) A DEVICE FOR DETERMINING THE QUANTITY OF COMPRESSED GAS DISPOSED TO THE CONSUMER (57) The invention relates to measuring the amount of gas discharged to a motor vehicle, can be used in the gas industry and improves the accuracy of measuring the discharged gas. The device for determining the amount of compressed gas supplied to the consumer contains low and high pressure accumulators 1 and 2, respectively, a gas filling column 3 with shut-off devices 4, a tared volume 5 of a weighing batcher 6. an adjustable choke 7, a check valve 8, a locking member 11 / sensor 12 pressure, unit 13 for measuring the mass of a given dose, adder 14, dials 15 and 20, gas quantity indicator 16, comparator 17, memory 18, gas quantity calculation device 19 in the weight metering unit 6 and interconnection ezhdu these elements. 1 hp f-ly. 1 il.

/ 4-jo

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about

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The invention relates to measuring the amount of gas discharged to a vehicle and can be used in the gas industry.

The purpose of the invention is to improve the accuracy of measuring the amount of gas supplied to the consumer.

The drawing shows a block diagram of an apparatus for determining the amount of gas supplied to a consumer.

The device contains low 1 and high 2 pressure accumulators, gas-filling column 3, in which shut-off devices 4 are installed, tared capacity 5 of weighing batcher 6, adjustable throttle 7 and non-return valve 8. Shut-off devices 4 connect gas sources 1 and 2 with measuring cylinders by means of high-pressure hoses 9 and with a calibrated tank 5 through a compensation tube 10 with a shut-off element 11. A pressure sensor 12 is installed to measure the pressure at the outlet of the gas filling column 3.

The refueling control system contains a mass measurement unit 13 for the dispensed dose, an adder 14, a first setting device 15, a gas quantity indicator 16, a comparator 17, a storage device 18, a gas amount calculation device 19 in a weight metering device and a second setting unit 20.

The system of filling gas cylinders and measuring the amount of gas dispensed to the consumer works as follows.

After the shut-off (shut-off) organ (s) is opened on the measuring cylinders of the vehicle, the shut-off member 11 is opened on the compensation tube 10. After the pressure in the measuring cylinders and in the tared container 5 is equalized, the steady-state signal from the weighing batcher 6 enters the mass measuring unit 13 of the delivered dose, and from there to the accumulator 14, where, after the first setting unit has entered 15 values of the volumes of the measuring cylinders, the initial mass of gas in them is calculated before filling by the following formula:

-

Sd

V.p-h.2)

P.Yl 5d

+ AGk, (1)

 t g

where Sb is the initial mass of gas in measuring cylinders;

Cd - the mass of gas in the weight of the dispenser 6;

p is the current value of pressure in the gas-filling column 3 (automatically supplied by the pressure transmitter 12);

0

five

0

Ve is the volume of the measuring cylinder (s);

VT is the volume of the calibrated capacity 5 of the weight metering unit 6 (constant value);

h is the gas column between the measuring cylinders and the calibrated container 5 (the value is constant or entered from the first 15 and second 20 setters before refueling);

g - free fall acceleration;

 + LР + с - the effect of the compensation tube 10 on the weight metering device 6; where a, b. c is the proportionality coefficients (determined experimentally; constant values).

The final value of the mass of gas dispensed into the measuring cylinders is entered into the second unit 20 and is adjusted to the mass of gas entering the tared container 5 and calculated using the device 19 for calculating the amount of gas in the weight metering device 6 according to the formula

25

.Gn

Sbc

/ b VT

(2)

 -kh

where Sbc - the final mass of gas in measuring cylinders;

k

2СбкдН0

-- - coefficient

2 Р V6 - Sbc d hc proportionality;

 m

The calculation results are sent to the storage device 18, from there to the comparator 17, after which the refueling control system is ready to work on filling the gas cylinder unit of a given dose.

To adjust the adjustable throttle 7 set to equalize the gas flow rate into the measuring cylinders and into the calibrated container 5 and, therefore, to maintain equal values of thermal parameters in them during the refueling process, the following calculated relationship can be used:

with - with. Vt 5DR - Lt.

(3)

where ST is the flow area of the discharge pipe connecting the gas source (low (H) and high (B) pressure accumulators) to the gas filling station 3 (constant value);

5Dr - the area of the flow area of the regulated droplets 7 (the value is variable).

After adjusting the adjustable throttle 7, open the locking member on the low-pressure accumulator 2, which connects

it with a gas dispenser 3, as well as shut-off devices 4 by the number of simultaneously filled gas installations of motor vehicles. the low pressure torus 1 and opens the valve on the high pressure battery 2. Refueling continues until the set dose values for the comparator 17 from the storage device 18 are equalized and the dose delivered for the comparator 17 from the mass measurement unit 13 for the delivered dose associated with the weight metering device 5. On command from the comparator 17 then close the shut-off device on the high-pressure battery 2 and open it on the low-pressure battery 1 together with the shut-off devices 4 in the gas-filling column 3. At the same time, part of the gas from the gas cylinder A car and a calibrated tank 5 are bypassed to low pressure accumulators 1 until the initial charge pressure is restored. To close the locking organ on the low pressure accumulator 1 and open it on the high pressure accumulator 2 in order to refuel the gas cylinder installation to a predetermined dose according to the above technology

This operation makes it possible to exclude from the scheme of refueling a compressor for gas charging of low pressure accumulator 1, cool gas in a gas cylinder installation by diverting a part of gas to low pressure accumulators, while lowering the gas temperature can be calculated using the well-known formula:

DT-T, lp;

(four)

where n is a coefficient depending on the type of process;

Tg - the initial temperature of the gas in the gas installation;

PI and P2 - gas pressure in the gas installation and after the gas outlet.

At t-atoron filling, the mass of gas supplied from high-pressure accumulators to the gas-cylinder installation with cooled gas increases. Besides.

in case of withdrawal of emergency problems ../. -R. anoac.) vamic gas parameters in the gas / engine tank and in the tared tank 5, with gas from the tared tank 5 being removed through the non-return valve 8, which ensures a uniform rate of gas withdrawal from the gas tank and the tared tank to the low battery pressure. Dunn technology

0 makes it possible to increase the accuracy of measuring the amount of gas supplied to the consumer.

Claims (2)

Invention Formula 51. A device for determining the amount of compressed gas supplied to a consumer, containing a source of gas and a gas dispenser with shutoff devices connected to 0 cylinders, characterized in that, in order to improve the accuracy of measuring the amount of gas supplied to the consumer, it additionally contains a calibrated weight metering unit with a unit for measuring the mass of the delivered dose, an adder, two adjusters. a comparator, a memory device, a device for calculating the amount of gas in a weight metering unit, a shut-off valve, an adjustable throttle with a check valve, a pressure sensor at the outlet of the gas filling column, and a gas quantity indicator; second entrance 5 of the comparator is connected via a storage device and a device for calculating the amount of gas in the weighing meter with the output of the first unit, the second input of the adder is connected to the output of the second unit, 0 and its output is with the gas quantity indicator, the output of the pressure sensor at the outlet of the gas filling column is connected to the corresponding input of the gas amount calculation device in the weight metering device and 5 by the third input of the adder, and the output of the comparator is connected to the shut-off devices, which are connected to a tared container through an adjustable choke with a check valve and a shut-off element 0 weight dispenser. 2. The device according to claim 1, characterized in that the calibrated container is made of the same material as the measuring cylinder, and the ratio of its volume to mass is 5 ratio of volume to mass of a measuring cylinder.