SU1221497A1 - Installation for calibration,checking and testing of liquid flowmeters - Google Patents

Abstract

The invention relates to the field of measurement technology and makes it possible to reduce the explosion and fire hazard of installations by eliminating the contact of fuel with current-carrying elements. The installation contains a liquid fuel tank 5 connected by a pressure line to the pressure device 1. A level indicator is installed in the stabilizing chamber 2, executed in the form of parallel channels 8, 9 and 10 with the nozzles installed in them 11. When the fuel level in the chamber 2 changes, the flow of gas-liquid mixture through the hydraulic pulsator 13, which changes the generated frequency supplied to the command unit 16. The pressure control system, including control valves 3, 4 and 7, prevents further change level and pressure reduction. The flow of liquid fuel through the flow meter 17 is controlled by the throttle 18 and the valve 21. The maintenance of the pressure drop I is maintained by the flow switch 19. 1 il. (L to th 4: o

Description

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The invention relates to a measurement tech- nique, namely exemplary flow metering installations for fuel,

The aim of the invention is to reduce explosion and fire hazards by eliminating the contact of fuel with current-carrying elements.

The drawing shows the scheme of the proposed installation.

The installation contains a pressure device with a stabilizing chamber

2, the source of compressed rasaj is connected to a stabilizing chamber and equipped with a pressure control system,

which includes controllable valves

3.4 The liquid fuel is stored in the reservoir 5, which is connected to the pressure device 1 by a pressure line equipped with a pump 6 and a SLRGV magnet} that actuates the electric valve 7. The stabilizing chamber 2 has a level indicator, made in the form of parallel channels 8, 9 and 10 with jets installed in them 11.

These channels are connected by their inputs to the stabilizing chamber at its different levels, and by outputs to the mixing line 12 connected to the liquid fuel reservoir 5. This line includes a hydraulic pulsator 13 and a gas separator 14. The hydraulic pulsator through the converter 15 is connected to a command a unit 16, which is also connected to the controllable valves 3 and 4 of the pressure control system of the compressed gas and the electric valve 7.

The installation also includes a rotary flow meter or calibrated flowmeter 17J variable flow throttle 18, flow switch 19, measuring tank 20 and control valve 21,

The installation works as follows

After the start of operation of the pump 6, the valve 21 is fully or partially closed depending on the required flow rate, and the liquid level in the stabilizing chamber 2 begins to rise, and the income reaches the channels 10, 9 and 8 of the detector. As the compressed gas is in the upper part of chamber 2, it is forced through the nozzles 11 into the mixing line 13 and leaves the circuit through the gas separator 14. At the same time, the electroforming valve 7

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remains closed. When channel 10 is flooded, the gas-liquid mixture begins to flow into the mixing line 12 at a flow rate of less than

the flow rate of the gas until the channel 10 is flooded. In this case, the hydraulic pulsator 13 will change the frequency of the pressure pulsations, which is proportional to the flow rate, and the converter 15 will change the frequency of the electric signal applied to the command unit 16. At the command of the latter, the motorized valve 7 will open and the valve will be controlled 3. As a consequence, the level of fuel and

(5 gas pressure in the stabilizing chamber 2 take the required value.

In automatic mode, the installation works as follows.

20 When the fuel level in the stabilizing chamber 2 changes, the flow rate of the gas-liquid mixture changes through the pulsator, which changes the generated frequency5 supplied to the command unit 16. The latter will change the position of the regulators of valves 7 and 3 or 4 in order to prevent further changes, gas pressure and return parameters to the original value.

The flow rate of liquid fuel through the flow meter 17 is controlled by the throttle 18 and the valve 21, while the flow through the discharge line is slightly higher than the required flow. fuel flow, pushed into the pressure device 1, is transferred to the tank 5 through the electric valve 7, E. The flow switch 19 directs the flow of fuel to the measuring tank 20.

 or tank 3 at a constant flow rate, which is ensured by maintaining the differential pressure at the work site with high accuracy.

When the fuel level in the stabilizing chamber 2 changes from the upper to the Hi cKHero limit positions, the fuel consumption changes by 0.005% of maximum I o for a given installation.

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Claims (1)

Invention Formula Installation for calibration, verification and testing of liquid flow meters, S5 containing a reservoir of liquid fuel, a pressure device with a stabilizing chamber, communicated with it by a drain line including an electric 30 45 3122 a drive valve, and a pressure line equipped with a pump, a source of compressed gas connected to the stabilizing chamber and equipped with a pressure control system in it, as well as a level indicator installed in the stabilizing chamber and connected to its electric outlet to the valve actuator by means of a control unit, the fact that, in order to reduce the explosion and fire hazards by eliminating the contact of the fuel with the tokopod497 elements, the level indicator is made in the form of parallel channels with jets installed in them, connected by their inputs to a stabilizing chamber at its different levels, outputs to a mixing line communicated with a liquid fuel reservoir, and a hydraulic pulsator 10 is installed in this line, its electrical output is associated with a command unit, and the latter is also connected with a pressure control system of compressed gas. - /, i, r 78 Compiled by V. Matveyev Editor M. Kelemesh Tehred O. Gortvay Proofreader A. Ferenc Order 1603/47 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Branch PPP Patent, Uzhgorod, st. Project, 4 Circulation 705 Subscription