RU91162U1 - GAS FLOW MEASUREMENT DEVICE - Google Patents

Abstract

1. A device for measuring gas flow, comprising a gas pressure sensor, an ambient temperature sensor and means for calculating the amount of gas charged, characterized in that an analog-to-digital converter is introduced into it, one input of which is connected to a pressure sensor, the other input to a temperature sensor, the output of the analog-to-digital converter is connected to a means for calculating the amount of gas charged, made in the form of a computing unit, the outputs of which are connected to a information board and / or a printing device vom. ! 2. The gas flow measuring device according to claim 1, characterized in that the means for calculating the amount of gas charged and the analog-to-digital converter are made in the form of an autonomous unit installed in the cab of a refueling vehicle or in an operator’s room.

Description

The utility model relates to gas-filling equipment used in the operation of gas-filled cars operating on compressed natural gas, in particular, to measuring and control devices for gas released from gas-filling gas-filling stations (CNG filling stations).

A known device for measuring the tempered gas containing a measuring sensor-flowmeter, an arithmetic device, a column with an indication board, operating in a wide range of pressure of the released gas [1].

The disadvantages of the known device are the large size, complexity and high cost of the device.

A known method for determining the amount of refueling compressed natural gas (CNG), in which the amount of gas released, refueling in the tank of vehicles, is determined by the tables developed by VNIINGAZ [1].

Metrologically certified tables are compiled for cars with different total cylinder volumes from 50 to 500 liters, cover the temperature range of the environment from -45 to + 45 ° C with a residual pressure in the car cylinders from 2 to 120 kgf / cm ² . Each table is designed for its own temperature range of the environment.

In the known method, the operator when refueling a gas gas takes into account the following parameters:

- initial pressure in the refueling cylinder P ₁ ;

- final pressure in the refueling cylinder P ₂ ;

- the capacity of the refueling cylinder V in liters;

- ambient temperature.

The means for calculating the amount of gas charged are tables according to which the operator, taking into account the above parameters, determines the amount of gas charged and calculates for gas.

The disadvantages of the known method of measuring gas flow should include the subjectivity and the complexity of the calculation.

A known device for measuring gas flow, including pressure and ambient temperature sensors [2], taken as a prototype, in which the amount of gas Q (m ³ ) in the vehicle’s cylinders is determined by the formula:

Where

P = P ₂ -P ₁ - the difference in gas pressure in the cylinders after the end of the filling process and before the start of filling in kgf / cm ² ;

V _B - the capacity of the gas cylinders of the refueling vehicle in liters;

z - coefficient taking into account the compressibility and temperature correction of CNG.

The disadvantages of the known device for measuring gas flow are the high complexity of the measurement, the complexity and subjectivity of the calculations.

The objective of the utility model is to create a small-sized, autonomous, simple and inexpensive device for measuring gas flow, which allows to measure the flow of refueling gas in real time.

The technical result achieved when solving the problem is to improve the accuracy of measurement and automation of the process of measuring gas flow.

The technical result is achieved by the fact that an analog-to-digital converter is introduced into one gas flow measuring device containing a gas pressure sensor, an ambient temperature sensor, and means for calculating the amount of gas charged, one input of which is connected to a pressure sensor, and the other input to a temperature sensor, the output of the analog-to-digital converter is connected to the means for calculating the amount of gas charged, made in the form of a computing unit, the outputs of which are connected to the information board and / or stove ayuschim device.

The technical result is also achieved by the fact that the means for calculating the amount of gas charged and the analog-to-digital converter are made in the form of an autonomous unit installed in the cab of the refueling vehicle or in the operator’s room.

The figure shows a block diagram of a device.

The device contains a gas pressure sensor 1 in the refueling line, an ambient temperature sensor 2, an analog-to-digital converter (ADC) 3, the inputs of which are connected to the outputs of the sensors 1 and 2, and the output of the ADC 3 is connected to the input of the computing unit (personal computer PC) 4 , Computing unit 4 is connected to an indicator board 5 and printing device 6. As a pressure sensor 1, an overpressure sensor MIDA-DI-13P can be used, as a temperature sensor, a thermocouple dTPL035-010.120, ADC-analog-to-digital converter Only E-270.

The device operates as follows.

The device is powered from the on-board network 24 V.

At the command of the operator, from the sensors 1 and 2, through the ADC 3, the computing unit 4 receives the readings of the initial P ₁ and final P ₂ refueling gas pressures, as well as the ambient temperature. The difference in gas pressure in the consumer’s tank after refueling and before refueling Р ₂ -Р ₁ , taking into account the temperature, calculates the volume of gas supplied to the consumer according to the formula (1). The calculations also take into account the volume of the consumer’s tank, the value of which the operator enters using the keyboard of PC 4. PC 4 calculates the amount of actually charged gas. The measurement results are displayed on the indicator board 5 (PC4 screen). If necessary, the PC 4 issues a command to the printing device 6, for example, to print a check to the consumer on a fiscal apparatus.

Information sources:

1. Product catalog of CNG filling stations. Page 10. Gas columns.

OOO Kalugagazmash, Kaluga Region, Maloyaroslavets, ul. Kirova, WWW.kalugagazmash.ru.

2. Guidance document RD 03112194-1095-03. "Guidelines for the organization of operation of compressed gas vehicles running on compressed natural gas." Order of the Ministry of Transport of Russia dated 01.01.2002. Regulatory documents adopted by line ministries. Sheet 47.

Claims (2)

1. A device for measuring gas flow, comprising a gas pressure sensor, an ambient temperature sensor and means for calculating the amount of gas charged, characterized in that an analog-to-digital converter is introduced into it, one input of which is connected to a pressure sensor, the other input to a temperature sensor, the output of the analog-to-digital converter is connected to a means for calculating the amount of gas charged, made in the form of a computing unit, the outputs of which are connected to a information board and / or a printing device vom. 2. The device for measuring gas flow according to claim 1, characterized in that the means for calculating the amount of gas charged and the analog-to-digital converter are made in the form of an autonomous unit installed in the cab of the refueling vehicle or in the operator’s room.