SU1723450A1 - Device for calibration of gas meters - Google Patents

Abstract

The invention relates to a measuring technique and can be used in flow metering installations used in the calibration and calibration of gas meters. The aim of the invention is to reduce the calibration time. Calibration of the gas meter 12 is carried out both when the bell 1 moves downwards and when the bell 1 moves upwards with a volume of gas enclosed in the cavity of bell 1 and the cavity of the hermetic container 17. Due to the installation in the gap between the piston 4 and the reservoir 2 with flexible diaphragm liquid 3 these volumes are sealed. The speed and direction of movement of the bell 1 are controlled by a speed switch 14 connecting the motor 13 to the gearbox 15. 2 Il.

Description

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ABOUT

The invention relates to a measurement technique and can be used in flow metering installations used in the calibration and calibration of gas meters, gas flow meters and test sets for them, as well as for accurate reproduction of gas quantity and flow rate.

The purpose of the invention is to reduce the calibration time.

Figure 1 shows the device with a bell in the upper position; figure 2, too, in the lower position.

The device consists of a bell 1, a reservoir with a liquid 2, a flexible diaphragm 3, a piston 4, valves 5-8, pipes 9-11, a test device 12, an electric motor 13, a gearshift 14, gearboxes 15, screws 16, an airtight container 17, grippers 18, flange 19, clamping ring 20, nuts 21, pressure gauge 22.

Structurally, the gas measuring instrument consists of two sealed chambers A and B. Inside the shell 17 there is a bell 1 and a reservoir with liquid 2 filling its annular space. Chamber A is connected to test device 12 by pipeline 9 with valve 5, and valve 7 to gas source by pipeline 11c.

The pressure in chamber A is monitored by a pressure gauge 22 mounted on the shell 17.

Chamber B by pipe 10 with valve 6 is connected to the test device 12, and pipe 10c by valve 8 to a gas source.

The gas meter works as follows.

Pipeline 11, through valves 7 and 8, chambers A and B are alternately filled. Through pipe 9 and 10 with valves 5 and 6, gas from the chambers is supplied to the device 12 under test.

Turning on the electric motor 13 through the speed selector 14, gears 15 are activated. The speed and direction of rotation of the screws 16 is provided by the speed selector 14. The test of the test device 12 is carried out with the vertical movement of the bell 1 and the liquid reservoir 2. 16 in nuts 21. Moving up, bell 1 and tank with liquid 2 will force gas out of chamber A through valve 5 through line 9 to test device 12. At this point chamber B will fill ha zom. Valves 5 and 7 are open, and 6 and 8 are closed.

During the downward period of the bell 1, the gas from the chamber B will be forced out through the pipeline 10 through the valve 6 to the test device 12. The speed switch 14 changes the direction and speed of movement of the bell 1 and the liquid reservoir 2, ensuring installation

the required flow rate at the inlet of the test device 12. The gas pressure in chamber A is controlled by a pressure gauge 22. When the bell 1 is lifted, its grippers 18, interacting with the flange 19, will raise

tank with liquid 2.

The flexible diaphragm 3 at the same time provides sealing between chambers A and B, and also does not prevent the movement of the reservoir with liquid 2 relative to the fixed piston 4. The flexible diaphragm 3 can be made, for example, of rubber or rubber-cord material.

During the period when the tank with the liquid 2 moves downwards, the bend of the diaphragm 3 will roll over its inner surface and take the initial position, as shown in Fig. 2.

The use of only the bell volume for calibration, but also the volume of the vessel, makes it possible to shorten the calibration time.

Claims (1)

The invention The device for calibration of gas meters, containing a sealed container, in which a bell is installed with the possibility of vertical movement, and the internal cavity of the bell and the cavity of the sealed container are connected by means of pipelines with shut-off valves to the gas supply lines and the test section, characterized in that in order to reduce the calibration time, a piston is installed at the bottom of the hermetic vessel, and the bell is placed in a movable tank with a liquid filled with a flange, the piston, the bell and the liquid reservoir are installed coaxially with the clearance relative to each other, a flexible diaphragm is mounted in the gap between the piston and the reservoir, fixed along the recession flange and around the perimeter of the upper end of the piston; and an airtight container with the test area, are connected to the entrance to the test site. 2